AC Power
For Business-Critical Continuity
Liebert NX UPS
User Manual–10-30kVA, 400V, 50/60Hz
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TABLE OF CONTENTS
SINGLE MODULE UPS INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.1 UPS Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.2 External Battery Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.3 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.1 System Cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.2 10 to 30kVA UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.3 Moving the Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.4 Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.5 Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.6 Final Positioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.7 Floor Anchoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.8 Cable Entry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
External Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5.1 Rectifier and Bypass Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5.2 External Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.5.3 UPS Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.6.1 Cable Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Control Cables and Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.7.1 Monitor Board Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Dry Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.8.1 Input Dry Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.8.2 Maintenance Bypass Cabinet Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.8.3 External Circuit-Breaker Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.8.4 Output Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.8.5 Emergency Power Off Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.8.6 External Bypass Switch Interlock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.8.7 Battery Start Facility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
BATTERY INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Battery Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.2 Temperature Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.5 Circuit Isolator Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.6 Battery Temperature Sensor (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.3.7 Moving the Battery Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.3.8 Cable Entry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.3.9 General Arrangement Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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Battery Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.4.1 Connection Principles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.4.2 Fitting the Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.4.3 Connecting the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.4.4 Battery Room Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Battery Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
UPS MULTI-MODULE INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Paralleled UPS Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.2.1 Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.2.2 External Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.2.3 Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.2.4 Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Hot-Standby UPS Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.3.1 Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.3.2 External Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.3.3 Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Dual Bus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.4.1 Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.4.2 External Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.4.3 Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.4.4 Control Wires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.4.5 Extended Dual Bus Synchronization Option (DBS Interface Box) . . . . . . . . . . . . . . . . . . . . . 32
INSTALLATION DRAWINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.1.1 Split-Bypass Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.1.2 Static Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.1.3 Battery Temperature Compensation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.1.4 Redundant Control Power Supply Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.1.5 Socket Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Multi Module UPS—1+N. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.2.1 Features of NX Multi-Module UPS Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.2.2 Requirements for Paralleling of UPS Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Modes of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.3.1 Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.3.2 Battery Mode (Stored Energy Mode). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.3.3 Auto-Restart Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.3.4 Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.3.5 Maintenance Mode (Manual Bypass) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.3.6 ECO Mode (Single UPS Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.3.7 Parallel Redundancy Mode (System Expansion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.3.8 Hot-Standby Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.3.9 Frequency Converter Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Battery Management—Set During Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.4.1 Normal Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
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Battery Protection (settings by commissioning engineer) . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
OPERATING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.1.1 Power Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
UPS Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.2.1 Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.2.2 Verify Switching Between Operation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Switching the UPS from Normal to Maintenance Bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Powering Down the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Powering Down the UPS and Maintaining Power to Load . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Emergency Shutdown With EPO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Auto Restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Language Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.10 Changing the Current Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.11 Command Password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.12 Isolating One Module in a Multi-Module System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.13 Inserting One Module into a Multi-Module System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
OPERATOR CONTROL PANEL AND DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7.1.1 Mimic Power Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.1.2 Audible Alarm (Buzzer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.1.3 Direct Access Push Buttons (Keys) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
7.1.4 LCD Monitor and Menu keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
7.1.5 Detailed Description of Menu Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
All Status and Event Messages Displayed on the UPS Front Panel. . . . . . . . . . . . . . . . . . . 60
Prompt (Pop-Up) Windows. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Dynamic Energy Flow Chart and UPS Help Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Default Screen Saver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
8.1.1 Battery Ground Fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
8.1.2 Redundant Fan for Power Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8.1.3 OC Web Card - SNMP/HTTP Network Interface Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
8.1.4 Relay Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
8.1.5 Multiport-4 Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
OC485 Web Card – Modbus, Jbus, IGM Net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.2.1 Remote Alarm Monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.2.2 Dust Filter for 10-30kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
9.1
Conformity and Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
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FIGURES
Figure i
Residual current circuit breakers (RCCB) symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Auxiliary terminal block detail monitoring board (U2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Input dry contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Jumper connection for BCB interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Output dry contacts and EPO wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Battery start for UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Single temperature sensor and monitor board-U2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Battery cabinet bottom cable entry location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Battery cabinet with fuse or optional circuit breaker locations . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 10 Battery cabinet internal layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 11 Battery cabinet, bottom entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 12 Battery room design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 13 Emergency power off connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
and optional output / bypass distribution panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 15 Dry contacts, multiple UPS modules with distribution panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 16 Connection of 1+N system parallel control cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 17 Hot standby configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 18 Typical dual bus system configuration with static transfer switch and Load Bus Synch . . . . . . 31
Figure 19 Connections of a typical dual bus system utilising Load Bus Synch . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 20 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 21 General arrangement—10-30kVA UPS module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 22 10-30kVA NX front view with doors open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 23 Location of parallel logic board M3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 24 Internal battery layout and connecting—GP12120 F2 (12AH/12V) . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 25 Internal battery layout and connecting—LC-R127R2PG1 (7.2AH/12V) . . . . . . . . . . . . . . . . . . . . 37
Figure 26 Internal battery layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 27 Single unit block diagram with split-bypass input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 28 Multiple battery temperature sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 29 1+N multi-module UPS with external maintenance bypass switch . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 30 Example of configuration for single UPS with external maintenance bypass cabinet. . . . . . . . . 49
Figure 31 UPS control and display panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Figure 32 Graphic LCD monitor windows and keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Figure 33 Menu tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 34 Help screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Figure 35 Default screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Figure 36 Battery ground fault detection set connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 37 Redundant power module fan set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Figure 38 Communication bays and cable location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Figure 39 OC Web Card data summary window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Figure 40 OC Web Card battery data summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Figure 41 SiteNet MultiPort4 Intellislot pin configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Figure 42 OC485 Web card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Figure 43 Dust filter replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
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TABLES
Table 1
Maximum steady state AC and DC currents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Distance from floor to connection point on the equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Input dry contacts at X3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance bypass cabinet interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
External circuit-breaker interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Output dry contact relays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
EPO input contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Dimensions and weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
UPS operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Rotary switch configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Table 11 UPS control and display panel components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 12 Rectifier indicator—1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 13 Battery indicator—2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 14 Bypass indicator—3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 15 Inverter indicator—4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 16 Load indicator—5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 17 Status (Alarm) indicator—6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 18 Audible alarm key. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 19 Menu key Icons and their meaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 20 UPS system window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Table 21 Descriptions of UPS menus and data window items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
UPS messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Table 23 Prompt windows, meanings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Table 24 Dry contact fault alarm signal is available for remote monitoring . . . . . . . . . . . . . . . . . . . . . . . . 66
Table 25 Relay Card pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Table 26 Relay card jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Table 27 SiteNet MultiPort4 Intellislot pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Table 28 NX communication options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Table 29 Compliance with European, international standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 30 Environmental characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 31 Overall efficiency, heat losses and air exchange. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 32 Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Table 33 Rectifier AC input (mains) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Table 34 Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Table 35 Inverter output to critical load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Table 36 Bypass mains input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
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Figure i Model number nomenclature
NXe
0
A0
010
U
Feature Set for Region
A0 - EMEA
Input &
Output
Voltage
50/60Hz
Voltage
Code
F
B0 - Aust/NZ
C0 - Japan
Output kVA
220/380
230/400
240/415
U
010
015
020
D0 - China
G
Revision
to Base
Unit
E0 - Latin Amer
F0 - Other
NX Product Line
UPS Single Module
Liebert NXe UPS module ratings:
10, 15, 20, 30kVA (with internal battery)
Example: NXE0A0010U =
10kVA module for Europe and Middle East, 400V/230V
output
Options
Model
Identification
Note
Battery cabinet
NXE0NBCS
Battery Ground Fault detection kit
Battery temperature probe (for external battery)
Maintenance bypass cabinet (separate bypass input)
Fan Redundancy kit
NXA0UFXBGF
NXA0UFXBTS
NXE0NMBX
NXE0UFXRF
NXA0UFXSAN
NXA0UFXD
Specify total system kVA
Specify UPS kVA rating
Seismic Anchor kit
Dual bus control cable 05-10-15 metres
Parallel control cable kit 05-10-15 metres
Specify length in metres
NXA0UFXP
Relay Card (On Bat, Bat Low, On Byp, Sum, UPS Fail)
MultiPort4 (4 sets On Bat, bat Low)
Web browser/TCPIP/SNMP Card
Jbus/Modbus Card
RELAYCARD-INT
MULTIPORT 4
OCWEB-LB
These are Intellislot plug-in cards (3 slots
available).
OC485CARD
RAM - Remote Alarm Monitor
Modem card
NXA0CFXRAM
NXA0CFXMOD
NXA0UFXLBS
NXA0UFXARF
Requires RELAYCARD-INT
Extended LBS box
Air Filter
One filter
(XXX: 050 or 150) - Specify length in
meters. Used for extension in length or
dual bus arrangement between Nx and
non-Nx sources'
Dual Bus Extension Kit 50-150 Meters
Individual Battery Monitoring
NXXXXMLBSKIT
Specify number of blocks. Consult
Emerson Network Power representatives
for complete configuration
BDS 40 or
BDS 256
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SAFETY PRECAUTIONS
This manual contains information concerning the installation and operation of this Emerson Network
™
Power Liebert NX Uninterruptible Power System (UPS).
This manual should be read before commencing installation.
The UPS must be commissioned and serviced by an engineer approved by the manufacturer (or
agent).
Failure to do so could result in personnel safety risk, equipment malfunction and invalidation of war-
ranty.
The Liebert NX has been designed for Commercial/Industrial use only, and is not recommended for
use in life support applications.
This is a low emission CLASS A Uninterruptible Power System (UPS) product. In a residential envi-
ronment, this product may nevertheless cause radio interference, in which case, the user may be
required to take additional measures.
Conformity and Standards
This equipment complies with CE directives 73/23 & 93/68 (LV Safety) and 89/336 (EMC), with Aus-
tralia and New Zealand EMC Framework (C-Tick) and with the following product standards for Unin-
terruptible Power System (UPS).
• EN / IEC / AS 62040-1-1—General and safety requirements for use in operator access area
• EN / IEC / AS 62040-2—EMC requirements; Class A compliant
• EN / IEC / AS 62040-3—Performance requirements and test methods
For more details, see 9.0 - Technical Specifications
Continued compliance requires installation in accordance with these instructions and the use of man-
ufacturer approved accessories only.
WARNING
!
High Leakage Current
EARTH CONNECTION IS ESSENTIAL BEFORE CONNECTING THE INPUT SUPPLY.
Earth leakage current exceeds 3.5 mA and is less than 860 mA.
Transient and steady-state earth leakage currents, which may occur when starting the
equipment, should be taken into account when selecting instantaneous RCCB or RCD devices.
Residual Current Circuit Breakers (RCCBs) must be selected sensitive to DC unidirectional
pulses (class A) and insensitive to transient current pulses.
Note also that the earth leakage currents of the load will be carried by this RCCB or RCD.
This equipment must be earthed in accordance with the local electrical code of practice.
WARNING
!
Back-Feed Protection Notice
This UPS is fitted with a voltage-free contact closure signal for use with an external
automatic disconnect device (supplied by others) to protect against back-feeding voltage into
the bypass input. If this signal is not used by the installer, a label must be added at the
external bypass input disconnect device to warn service personnel that the circuit is
connected to a UPS.
The text to use is the following or equivalent:
ISOLATE THE UNINTERRUPTIBLE POWER SYSTEM BEFORE WORKING ON THIS
CIRCUIT.
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User-Serviceable Parts
All equipment maintenance and servicing procedures involving internal access requires the use of a
tool and should be carried out only by trained personnel. There are no user-serviceable parts behind
covers requiring a tool for removal.
This UPS is fully compliant with safety regulations for equipment located in an operator accessible
area. Hazardous voltage is present within the UPS and battery enclosure but out of reach of non-ser-
vice personnel. Contact with hazardous voltage is minimized by housing live parts behind safety pan-
els that require a tool for their removal. No risk exists to any personnel when operating the
equipment in the normal manner, following the recommended operating procedures.
Battery Voltage Exceeds 400VDC
All physical battery maintenance and servicing requires the use of a tool or a key and should be car-
ried out only by trained personnel.
WARNING
!
Special care should be taken when working with the batteries associated with this equipment.
When connected together, the battery terminal voltage will exceed 400VDC and is potentially
lethal.
Battery manufacturers supply details of the necessary precautions to be observed when working on,
or in the vicinity of, a large bank of battery cells. These precautions should be followed implicitly at all
times.
Attention should be paid to the recommendations concerning local environmental conditions and the
provision of protective clothing, first aid and fire-fighting facilities.
2
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Single Module UPS Installation
1.0 SINGLE MODULE UPS INSTALLATION
1.1
Introduction
This following section describes the requirements that must be taken into account when planning the
positioning and cabling of the Liebert NX uninterruptible power supply and related equipment.
This chapter is a guide as to general procedures and practices that should be observed by the install-
ing engineer. The particular conditions of each site will determine the applicability of such proce-
dures.
WARNING
!
Professional Installation Required
Do not apply electrical power to the UPS equipment before being authorised to do so by the
commissioning engineer.
The UPS equipment shall be installed by a qualified electrical tradesperson in accordance
with the information contained in this manual. All equipment not referred to this manual is
shipped with details of its own mechanical and electrical installation.
NOTE
Three-phase, 4-wire input supply required.
The standard Liebert NX UPS is suitable for connection to 3-phase, 4-wire (+ Earth) TN, TT
and IT AC power distribution systems (IEC60364-3). Optional 3-wire to 4-wire conversion
transformers are available. If it is used in IT AC power distribution systems, a 4-pole circuit
breaker must be used on the input and refer to the relative IT Systems’ standard
WARNING
!
Battery Hazards
Special care should be taken when working with the batteries associated with this equipment.
When connected together, the battery terminal voltage will exceed 400VDC and is hazardous.
Eye protection should be worn to prevent injury from accidental electrical arcs.
Remove rings, watches and all other metal objects.
Use only tools with insulated handles.
Wear rubber gloves.
If a battery leaks electrolyte or is otherwise physically damaged, it must be replaced, stored in
a container resistant to sulfuric acid and disposed of in accordance with local regulations.
If electrolyte comes into contact with the skin, the affected area should be washed
immediately with water.
1.2
Preliminary Checks
Before installing the UPS, please carry out the following preliminary checks:
1. Visually examine the UPS and battery equipment for transit damage, both internally and
externally. Report any damage to the shipper immediately.
2. Verify that the correct equipment is being installed. The equipment supplied has an identification
tag on the back of the main door reporting: the type, size and main calibration parameters of the
UPS.
3
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Single Module UPS Installation
1.3
Location
1.3.1 UPS Room
The UPS and its internal battery is intended for indoor installation and should be located in an envi-
ronment with clean air and with adequate ventilation to keep the ambient temperature within the
All models in the Liebert NX UPS range are air-cooled with the aid of internal fans. Cold air enters
through ventilation grilles at the front of the cabinet and hot air is released through the grilles at the
back. Do not cover the ventilation openings.
If necessary to avoid room temperature build-up, install a system of room extractor fans. Optional air
filters are available if the UPS is to operate in a dusty environment.
depending on the selected mode of operation:
• Normal Mode (VFI SS 111 Double Conversion UPS)
• ECO Mode (VFD SS 311 Stand By UPS)
If in doubt use Normal Mode figures.
NOTE
The UPS is suitable for mounting on concrete or other non-combustible surface only.
1.3.2 External Battery Room
Batteries should be mounted in an environment where the temperature is consistent and even over
the whole battery. Temperature is a major factor in determining the battery life and capacity. Typical
battery manufacturer performance data are quoted for an operating temperature between 20 and
25°C (68 and 77°F). Operating above this range will reduce the battery life while operation below this
range will reduce the battery capacity. In a normal installation the battery temperature is main-
tained between 15°C and 25°C (59 and 77°F). Keep batteries away from main heat sources or main air
inlets etc.
Where the batteries are located externally to the main UPS cabinet, a battery protection device
(e.g., fuses or circuit breakers) must be mounted as close as possible to the batteries themselves, and
connected using the most direct route possible.
1.3.3 Storage
Should the equipment not be installed immediately, it must be stored in a room for protection against
CAUTION
!
An unused battery must be recharged periodically per battery manufacturer
recommendation. Temporarily connecting the UPS to a suitable AC supply mains and
activating it for the time required for recharging the batteries can achieve this.
4
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Single Module UPS Installation
1.4
Positioning
The cabinet is mounted on four castor-wheels for ease of positioning and for short distance movement.
Jacking feet are provided to prevent the UPS from moving once it has been wheeled to its final posi-
tion.
For optimal design life, the place chosen must offer:
• Easy connection
• Enough space to easily work on the UPS
• Sufficient air exchange of enough to dispel heat produced by UPS
• Protection against atmospheric agents
• Protection against excessive humidity and very high heat sources
• Protection against dust
• Compliance with the current fire prevention requirements
• Operating environment temperature between 20°C and 25°C (68 and 77°F). The batteries are at
The UPS cabinet is constructed around a steel chassis with removable panels. The top and side panels
are secured to the chassis by screws.
Access to the power terminals, auxiliary terminals blocks and power switches is from the front. Oper-
ational status and alarm information is provided through the front door operator control panel. Mod-
els 30kVA and below house both the power components and an internal battery. Cooling air enters
the front of the NX and is exhausted out the rear.
1.4.1 System Cabinets
A UPS may comprise a number of cabinets, depending on the design requirements (e.g., UPS cabinet,
external battery cabinet, external bypass cabinet). In general, all the Liebert cabinets used in a particu-
lar installation are of the same height and designed to be positioned side-by-side to form a matching
array.
1.4.2 10 to 30kVA UPS
The UPS consist of a single cabinet, which uses typically forty (40) 12V battery blocks, fitted inter-
nally and connected in series to provide a nominal battery voltage. The UPS may be shipped without
the batteries fitted.
An extended battery option is available. This comprises a separate cabinet containing additional bat-
teries that can be connected to the UPS to increase its battery run time.
1.4.3 Moving the Cabinets
WARNING
!
Ensure that any equipment used to move the UPS cabinet has sufficient lifting capacity.
The UPS is fitted with casters. Take care to prevent the NX from moving when unbolting the
unit from its shipping pallet. Ensure that adequate personnel and lifting aids are available
when removing the shipping pallet.
Ensure that the UPS weight is within the designated surface weight loading of any handling equip-
UPS and optional cabinets (battery cabinets, top cable entry cabinets, etc.) can be handled by means
of a forklift or similar equipment.
The UPS cabinet also can be moved short distances by its casters.
NOTE
Care must be taken when maneuvering units fitted with batteries. Keep such moves to a
minimum.
5
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Single Module UPS Installation
1.4.4 Clearances
The Liebert NX has no ventilation grilles at either side of the UPS. To enable routine tightening of
power terminations within the UPS, in addition to meeting any local regulations, Liebert recom-
mends providing adequate clearance in the front of the equipment for unimpeded passage of person-
nel with the doors fully opened. It is important to leave of 150mm (5.9") clearance behind the UPS to
permit adequate circulation of air coming out of the unit.
1.4.5 Access
The component layout of the UPS supports front and top access while servicing, diagnosing and
repairing the UPS, thus reducing the space requirement for side and rear access.
1.4.6 Final Positioning
The UPS cabinets are fitted with casters on the base to allow ease of movement and positioning.
WARNING
!
Casters are strong enough for movement across even surfaces only. Caster failure could occur
if they are subjected to shock loading.
When the equipment has been finally positioned, ensure the adjustable feet are set so that the UPS
will remain stationary and stable.
1.4.7 Floor Anchoring
which the equipment may be bolted to the floor. If the equipment is to be installed on a raised floor it
should be mounted on a pedestal suitably designed to accept the equipment point loading. Refer to the
1.4.8 Cable Entry
Cables can enter the Liebert NX UPS and battery cabinet from below. Cable entry is made possible by
removing a blanking piece fitted at the bottom of equipment to reveal the cable entry hole.
1.5
External Protective Devices
Circuit breakers or other protective devices must be installed in the AC supply, external to the UPS.
This chapter provides guidelines for qualified installers who must have knowledge of local wiring
practices pertaining to the equipment to be installed.
1.5.1 Rectifier and Bypass Input
Overcurrent protection must be installed at the distribution panel of the incoming main supply. The
protection must discriminate with the power cables current capacity and with the overload capacity of
Split-Bypass—If a split-bypass is used, install separate protective devices for the rectifier and for
the bypass in the incoming mains distribution panel.
NOTE
Rectifier and bypass input sources must be referenced to the same neutral potential.
NOTE
For IT power systems, four-pole protective devices must be used, external to the UPS, both
upstream of the input distribution panel and downstream (toward the load).
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Single Module UPS Installation
Earth Leakage (RCD):
Any residual current detector (RCD) installed upstream of the UPS input supply must be:
• sensitive to DC unidirectional pulses (Class A)
• insensitive to transient current pulses, and
• must have an average sensitivity, adjustable between 0.3 and 1A.
Figure 1 Residual current circuit breakers (RCCB) symbols
To avoid false alarms, earth leakage monitoring devices when used in systems with split-bypass input
or when used in paralleled UPS configurations, must be located upstream of the common neutral
sinking point. Alternatively, the device must monitor the combined four-wire rectifier and split-
bypass input currents.
The residual earth current introduced by the RFI suppression filter inside the UPS is greater than
3.5mA and less than 860mA. Liebert recommends verifying the selectivity with all other differential
devices both upstream of the input distribution board and downstream (toward the load).
1.5.2 External Battery
The UPS and its associated batteries are protected against overcurrents through a DC compatible dis-
connect device.
1.5.3 UPS Output
Any external distribution board used for load distribution shall be fitted with protective devices that
discriminate with those used at the bypass input to the UPS and with the UPS overload characteris-
7
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Single Module UPS Installation
1.6
Power Cables
The cable design must comply with the voltages and currents provided in this section, follow local wir-
ing practices and take into consideration the environmental conditions (temperature and physical
support media).
WARNING
!
Before starting the UPS, ensure that you are aware of the location and operation of the
external isolators that connect the ups input/bypass supply to the mains distribution panel.
Check that these supplies are electrically isolated and post any necessary warning signs to
prevent their inadvertent operation.
WARNING
!
Failure to follow adequate earthing procedures may result in electromagnetic interference or
in hazards involving electric shock and fire.
Table 1
Maximum steady state AC and DC currents
Nominal Current, Amps
Busbar Stud Size
Input/Output/
1,2
Input Mains Current
2
With Full Battery
Output Current
at Full Load
3ph + N
Recharge
3ph + N
Bypass
Cables
External
battery
Cables
(Bolts)
UPS
Rating
(kVA)
Battery at
End of
Hole
Dia.
(mm)
Torque
Load
(Nm)
380V
400V
21
415V
380V 400V 415V Discharge Bolt
10
15
20
30
22
33
44
63
20
31
42
61
15
22
30
45
14
21
29
44
13
20
28
42
22
33
44
66
32
M6
6
M6
5
43
62
1. Input mains current listed for common rectifier and bypass AC input. For split input the rectifier current is 94% of the currents
listed.
2. Non-linear loads (switch mode power supplies) affect the design of the output and bypass neutral cables. The current
circulating in the neutral cable may exceed the nominal phase current. A typical value is 1.5 In.
3. Protective earth cable: Connect each cabinet to the main ground system must follow the most direct route possible.
The earth conductor shall be sized in accordance with the AC supply fault rating, cable lengths and type of protection. Typical
cross sectional areas are 2.5mm2 (10kVA), 6mm2 (15kVA), 10mm2 (20kVA), 16mm2 (30kVA), as per AS / IEC 60950-1
4. When sizing battery cables, a maximum volt drop of 4 VDC is permissible at the current ratings given in Table 1. The load
equipment is generally connected to a distribution board containing individually protected busbars rather than connected
directly to the UPS output. The output cables from paralleled units to the parallel distribution bus should be of same length so
as to optimise the sharing of current. Do not form coils, so as to minimise the formation of electromagnetic interference.
Table 2
Distance from floor to connection point on the equipment
Minimum Distance
UPS
mm (in.)
Rectifier A.C. Input supply
Bypass A.C. Input supply
UPS Output A.C.
284 (11-1/5)
284 (11-1/5)
369 (14-1/2)
369 (14-1/2)
1104 (43-1/2)
Battery Power
Auxiliary cables: Monitor board (U2)
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Single Module UPS Installation
1.6.1 Cable Termination
NOTE
The operations described in this section must be performed by authorised electricians or
qualified technical personnel. If you have any difficulties, do not hesitate to contact our
Customer Service and Support Department. See the back page of this manual for contact
information.
Once the equipment has been finally positioned and secured, connect the power cables as described in
the following procedure.
1. Verify that the UPS equipment is isolated from its external power source and all the UPS power
isolators are open. Check that these supplies are electrically isolated and post any necessary
warning signs to prevent their inadvertent operation.
2. Open the door to the UPS cabinet and remove the front protective cover to gain access to the
connections bars.
3. Connect the safety earth and any necessary bonding earth cables to the copper earth busbar
located on the floor of the equipment below the power connections. All cabinets in the UPS must
be connected to the user’s ground connection.
NOTE
The earthing and neutral bonding arrangement must be in accordance with local and national
codes of practice.
Identify and make power connections for incoming cables according to one of the two procedures
below, depending on the type of installation.
Common Input Connections
4. For common bypass and rectifier inputs, connect the AC input supply cables between the mains
distribution panel and the UPS input (mA-mB-mC-N terminals) and tighten the connections to
5Nm (M6 Bolt). Ensure correct phase rotation.
Split-Bypass Connections
5. If a split-bypass configuration is used, connect the AC input supply cables to the rectifier input
busbars (mA-mB-mC-N terminals) and the AC bypass supply cables to the bypass input
(bA-bB-bC-N terminals) and tighten the connections to 5 Nm (M6 Bolt). Ensure correct phase
rotation.
NOTE
For split-bypass operation, ensure that the linking busbars between bypass and rectifier input
are removed.
The AC input and the AC bypass supplies must be referenced to the same neutral point.
Frequency Converter Mode
If a frequency converter configuration is used, connect the AC input supply cables to the rectifier
input busbars (U1-V1-W1-N terminals) to 5Nm for M6 bolts, to 13Nm for M8 bolts or to 26Nm (M10
bolt). Ensure correct phase rotation and tighten the connections. There will not be any AC
bypass supply cables to the bypass input (U3-V3-W3-N terminals).
NOTE
For frequency converter operation, ensure that the linking busbars between bypass and rectifier
input are removed.
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Single Module UPS Installation
Output System Connections
6. Connect the system output cables between the UPS output (oA-oB-oC-N terminals) and the
critical load and tighten the connections to 5 Nm (M6 Bolt). Ensure correct phase rotation.
WARNING
!
If the load equipment will not be ready to accept power on the arrival of the commissioning
engineer, ensure that the system output cables are safely isolated at their ends.
Internal UPS Battery Connection
7. The battery consists of a series string connection of 5 x 8 (or 10) x 12V 6-cell battery blocks.
a. Ensure that the 8 (or 10) battery blocks in each tier (tray) are interconnected.
b. Connect the positive, neutral and negative cables to the UPS terminals.
c. Plug in the cables between the tiers.
d. Ensure correct polarity battery string series connections (i.e., intertier and
interblock connections are from positive to negative terminals.
WARNING
!
Hazardous Battery Terminal Voltage 480VDC
Ensure correct polarity of string end connections to the UPS terminals, i.e., positive to
positive, negative to negative and neutral to neutral, but leave these UPS terminal cables
disconnected until connection is authorised by the commissioning engineer.
Ensure correct polarity of string end connections to the battery circuit breaker and from the
battery circuit breaker to the UPS terminals, i.e., positive to positive and negative to negative,
but disconnect one or more battery cell links in each tier.
Do not reconnect these links and do not close the battery circuit breaker before authorised by
the commissioning engineer.
8. Refit all protective covers removed for cable installation.
10
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Single Module UPS Installation
1.7
Control Cables and Communication
1.7.1 Monitor Board Features
Based on your site’s specific needs, the UPS may require auxiliary connections to manage the battery
system (external battery circuit breaker, battery temperature sensor), communicate with a personal
computer or provide alarm signaling to external devices or for Remote Emergency Power Off (REPO).
The monitor board, arranged for this purpose, is located on the rear of the operator access door. The
main features are:
• Input and Output dry contacts signal (one pair of contacts of relay)
• Emergency Power Off control (EPO)
• Environmental parameter input interface
• User communication (for data setting and user background monitor)
• Intellislot™ interface
• Modem interface
• Temperature detect interface
Figure 2 Auxiliary terminal block detail monitoring board (U2)
J8
J3
J1
X7
X6
J22
J23
LCD
J12
J9
J2
PWR
Modem
SNMP Card
J15
J16
X5
J17
X4
Intellislot 2
Intellislot 1
Intellislot 3
X4
J24
J21
J25
J28
J4
J26
J30 J10
J13
EPO
X2
Dry In
MBC
X3
BCB
BFP
INV
X1
ACF
The black square (
on each slot indicates Pin 1.
)
11
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Single Module UPS Installation
1.8
Dry Contacts
The UPS provides input dry contacts and output dry contacts.
1.8.1 Input Dry Contacts
There are several input dry contacts at the X3 slot.
Figure 3 Input dry contacts
12V
12V
12V
12V
X3
J4
J26
J30
J10
X3 Ancillary Control and Alarms
X3 IN DRY: Environmental, Battery Ground Fault and Generator Contacts
The UPS accepts external signalling from voltage-free (dry) contacts connected to finger-proof, push-in ter-
minal X3 IN DRY. Subject to prior software programming, the signalling is accepted by the UPS when
connection between the relevant terminal and the +12V terminal is altered. Cables connected to X3 IN
DRY must be segregated from power circuits (for screening purposes), double insulated and of a typical 0.5
2
to 1mm cross-section area for maximum runs between 25 and 50 meters (82-164 ft), respectively.
Table 3
Input dry contacts at X3
Name
Position
J4.1
Description
3
ENV
Battery Room Alarm (NC)
Battery Ground Fault Detection (NC)
On Generator (NO)
J4.2
BtG
1,2
J4.3
GEN
J4.4
+12V
+12V Power
1 - Must be configured by configuration software before becoming active.
2 - When activated, the charger current can be limited, via software, to a percentage of the full charger current (0-100%).
3 - Activating this feature turns the battery charger off.
1.8.2 Maintenance Bypass Cabinet Interface
J26 and J30 are the MBC interface.
Table 4
Maintenance bypass cabinet interface
Name
Position
J26.1
J26.2
J26.3
J26.4
J30.1
J30.2
J30.3
J30.4
Description
1
T_IT
Input transformer overtemperature (NC)
Reserved
AUX_I
+12V
GND
+12V Power
Power Ground
FUSE
Reserved
F_FAN Fan Fail Alarm (NC)
1
T_OT
Output Transformer Overtemperature (NC)
AUX_O Reserved
1 - Must be configured by software before becoming active
NOTE
2
All auxiliary cables of terminal must be double-insulated. Wire should be 0.5-1.5mm
(16-20AWG) stranded for maximum runs between 25 and 50 meters (82-164ft.) respectively.
12
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Single Module UPS Installation
1.8.3 External Circuit-Breaker Interface
J10 is the interface to any external battery circuit breaker (BCB).
Table 5
External circuit-breaker interface
Name
DRV
FB
Position
J10.1
Description
BCB Driver Signal - (reserved)
J10.2
BCB Contact State -(reserved)
J10.3
GND
OL
Power Ground
J10.4
BCB On-Line - Input - This pin will become active when BCB interface is connected. (N.O.)
NOTE
2
All auxiliary cables of terminal must be double-insulated. Wire should be 0.5-1.5mm
(16-20AWG) stranded for maximum runs between 25 and 50 meters (82-164ft.) respectively.
Figure 4 Jumper connection for BCB interface
UPS Monitoring Board
J10
Aux – N.O.
Aux – N.O.
Battery Circuit Breaker
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Single Module UPS Installation
1.8.4 Output Dry Contacts
Figure 5 Output dry contacts and EPO wiring
+12V
X1
X2
J13
J21
J25
J28
EPO - NO
EPO - NC
Table 6
Output dry contact relays
Name
BFP_O
BFP_S
BFP_C
INV_O
INV_S
INV_C
ACF_O
ACF_S
ACF_C
Position
J13.2
J13.3
J13.4
J21.2
J21.3
J21.4
J25.2
J25.3
J25.4
Description
Bypass feedback protection relay; normally open; closed when bypass SCR is shorted
Bypass feedback protection relay center
Bypass feedback protection relay; normally closed; open when bypass SCR is shorted
Inverter mode relay; normally open; closed when UPS is in inverter mode
Inverter mode relay center
Inverter mode relay; normally closed. Opened when UPS is in inverter mode
Main input fault relay; normally open. Closed when main input is in fault
Main input fault relay center
Main input fault relay; normally closed. Open when main input is in fault
NOTE
2
All auxiliary cables of terminal must be double-insulated. Wire should be 0.5-1.5mm
(16-20AWG) stranded for maximum runs between 25 and 50 meters (82-164ft.) respectively.
14
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Single Module UPS Installation
1.8.5 Emergency Power Off Input
The UPS has an Emergency Power Off (EPO) function that operates by a button on the control panel
or by a remote contact provided by the user. The EPO button is under a hinged, clear plastic shield.
point that becomes active when shorting terminals X2: 3 and 4 or open terminal connection X2: 2 and 1
If an external emergency stop facility is required, it is connected terminals X2: 1&2 or X2: 3&4 of the
auxiliary terminal block (X2). It also is connected to the normally open or normally closed remote stop
switch between these two terminals using shielded cable (see Figure 5 and Table 7). If this function
is not used, terminals X2: 3&4 must be opened and X2: 1&2 must be closed.
Table 7
EPO input contact relays
Position
J28.1
Name
Description
EPO_NC
EPO_NC
EPO_NO
EPO_NO
EPO activated when opened to J28.2
EPO activated when opened to J28.1
EPO activated when shorted to J28.4
EPO activated when shorted to J28.3
J28.2
J28.3
J28.4
NOTE
The emergency stop action within the UPS shuts down the rectifier, inverter and static bypass.
It does not internally disconnect the input power supply. To disconnect ALL power to the UPS,
open the upstream feeder breaker(s) when the remote EPO is activated.
NOTE
Normally closed EPO – X2: 1,2, these terminals are supplied factory-linked on the monitor
board and must remain installed if using NC contacts.
NOTE
2
All auxiliary cables of terminal must be double-insulated. Wire should be 0.5-1.5mm
(16-20AWG) stranded for maximum runs between 25 and 50 meters (82-164ft.) respectively.
X5: Auxiliary DC Power Output
Auxiliary DC power for modem or external SNMP card. The voltage is between 9V to 12V. The maxi-
mum current is 500mA.
X6: Analog Input Interface
Two analog signal channels with an input range is from 0 to +12V. The precision of detection is ÷3%.
• X6 pin 1: Not used
• X6 pin 2: +12V
• X6 pin 3: ENV-T – environment temperature detection
• X6 pin 4: GND
X7: External Battery Temperature Detector Interface
Interface for TMP12Z temperature detector, normally connected to an external battery cabinet (see
Figure 7).
Pin reference:
• X7 pin 1: Not used
• X7 pin 2: +12V (Power supply for Temperature Monitoring Probe)
• X7 pin 3: BAT-T (Battery Temperature signal)
• X7 pin 4: GND
15
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Single Module UPS Installation
Serial Ports RS232-1 and RS232-2
RS232-1 provides serial data and is intended for direct use with Liebert MultiLink monitoring and
server shutdown software.
RS232-2 provides serial data and is intended for use by authorized commissioning and service person-
nel.
These serial ports are shared with the optional Web browser, SNMP, ModBus and relay cards. Refer
Intellislot Web Browser, SNMP, ModBus and Relay Cards Interface
There are three interface slots available for optional Web browser, SNMP, ModBus and Relay cards
1.8.6 External Bypass Switch Interlock
EXT-Maint X3-1&2 on UPS Parallel Board M3 (leave open if no external bypass switch is used)
Provides external maintenance bypass interlock protection for the UPS. Short circuit means external
bypass closed.
EXT-Out (X3-3&4) on UPS Parallel Board (leave shorted if no external output switch is used). Pro-
vides external output interlock protection for paralleled UPS modules. Short circuit means external
output switch closed.
NOTE
UPS Parallel Board M3 is located behind protective covers accessible after opening the UPS
front door – removal of this barrier requires the use of a tool and is restricted to service
personnel.
NOTE
Jumper JP1 (located next to X3) needs to be removed for X3:3&4 to work properly.
1.8.7 Battery Start Facility
1. Rotate the switch to Normal Mode.
2. Verify that the batteries are connected.
3. Press Battery Start Button.
The LCD begins to show startup screens. The rectifier indicator flashes green while the rectifier is
starting up. It stops flashing and becomes solid green about 30 seconds after the rectifier enters
the normal operation state.
4. After UPS has initialized, press Inverter On
Figure 6 Battery start for UPS
Battery Start Button
16
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Battery Installation
2.0 BATTERY INSTALLATION
2.1
Introduction
The UPS battery bank consists of battery blocks connected in series to provide a D.C. string voltage as
required by the UPS converter. The 'AUTONOMY TIME' (the time during which the battery can
maintain supply to the load in the event of a mains failure) is limited by the ampere-hour capacity of
the battery blocks and in some cases this results in several strings being connected in parallel.
The NX usually has internal batteries, but longer run time is available by using an external battery
cabinet.
The battery cabinet will be supplied in one of the following forms:
1. Complete installation, comprising the battery cabinet, batteries and protective device.
2. Battery cabinets and protective device only—batteries supplied by others
NOTE
10kVA to 30kVA UPS models contain an internal battery compartment that can accommodate
up to 44 blocks of batteries for 12Ah/12V; 80 blocks of batteries for 7.2Ah/12V
The battery bank may be disconnected from the UPS for maintenance or service.
17
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Battery Installation
2.2
Safety
Special care should be taken when working with the batteries associated with the Liebert NX UPS
system. When all the cells are connected together, the battery terminal voltage is potentially hazard-
ous. The battery installation must be segregated from all but appropriately qualified maintenance
personnel by locating the cells in a key-lockable cabinet or in a purpose-designed, dedicated battery
room. When the batteries require maintenance, these precautions must be taken:
• The rotary switch must be turned to Maint. position.
• The input circuit breaker (CB1) must be opened.
• The ANDERSON connector must be disconnected..
NOTE
The fuse on the battery EMI board (UHA241A2-10kkVA, UHK241A2-15/20kVA,
UHS242A2-30kVA) is 600VDC/30A, High Speed Fuse.
NOTE
Full safety instructions concerning the use and maintenance of UPS batteries are provided in
the appropriate battery manufacturers manuals. The battery safety information contained in
this section relates to key considerations that must be taken into account during the
installation design process and might affect the design outcome depending on localised
conditions.
WARNING
!
Hazardous battery voltage present behind covers
No user-serviceable parts are located behind covers that require a tool for their removal. Only
qualified service personnel are authorised to remove such covers.
When using internal batteries in 10 to 30kVA units, the batteries are always connected
through power fuses to the UPS and to the segregated terminal bars available for connection
to an external battery.
Isolate any internal battery connections before attempting to access the segregated terminal
bars available for connection to an external battery.
The following general battery safety precautions and warnings should be observed at all
times:
• A battery can present risk of electric shock or burn from high- short-circuit currents.
• The full nominal string voltage, when the battery blocks are interconnected, is 480VDC,
which is hazardous
• Only qualified personnel should install or service batteries.
• Eye protection should be worn to prevent injury from electrical arcs.
• Remove rings, watches, necklaces, bracelets and all other metal objects.
• Use only tools with insulated handles.
• Wear rubber gloves and a rubber apron when handling batteries.
• If a battery leaks electrolyte or is otherwise damaged, it should be placed in a container
resistant to sulfuric acid and disposed of in accordance with local regulations.
• If electrolyte comes into contact with the skin the affected area should be washed immedi-
ately with plenty of clean water.
• Batteries must always be disposed of according to local environmental laws.
• When replacing batteries, use the same number and type that were originally fitted.
• Disconnect charging source before connecting or disconnecting battery terminals.
• Determine whether the battery is inadvertently grounded. If it is inadvertently grounded,
remove the source of the ground. Contact with any part of a grounded battery can result in
electrical shock.
18
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Battery Installation
2.3
Battery Cabinet
2.3.1 Introduction
This cabinet can also be used in conjunction additional cabinets, to provide the necessary accommoda-
tion required by the larger cells associated with system’s having a long autonomy time.
Where two (or more) cabinets are used they are positioned alongside each other and secured and
bonded together. If the cabinet(s) is located immediately adjacent to the main UPS equipment the two
units are bolted together.
2.3.2 Temperature Considerations
Valve-regulated, lead acid battery cells are sensitive to ambient temperature and should be operated
between 15°C and 25°C (59-77°F). Battery capacity is increased by 1% for every 1°C (2°F) increase in
temperature up to 25°C (77°F). Battery life is reduced at temperatures above 25°C (77°F).
When batteries are mounted in the same room as the UPS unit, it is the battery that dictates the
designed maximum ambient temperature, not the UPS. — i.e. in the case of valve-regulated cells, the
ambient room temperature should be kept between 15°C and 25°C (59-77°F), and not between 0°C
and 40°C (32-104°F) (which is the specified main equipment operating temperature range). Tempera-
ture deviations are permissible for short periods, provided the average temperature does not exceed
25°C (77°F).
2.3.3 Dimensions
module and provide a matching appearance when bolted together. All cabinets are fitted with doors,
which must be fully opened in order to fit or remove the batteries. The door swing must therefore be
taken into consideration when planning the positioning of the cabinets.
2.3.4 Weight
the batteries and cables must be added to the unladen weight. This is particularly important when
placing the NX on a raised floor.
Table 8
Dimensions and weight
Optional
Circuit Breaker
Amperes
Maximum
Discharge Current
(at EOD)
Cabinet Weight
Without Batteries
kg (lb)
External Cabinet
WxDxH mm (in)
Model
10kVA 22A
15kVA 33A
20kVA 44A
50A
820x700x1400
(32-1/4x27-5/8x55)
Battery Cabinet
170 (375)
80A
30kVA 66A
2.3.5 Circuit Isolator Features
The UPS is fitted with Anderson connectors and fuses for connection and disconnection of internal
batteries. External battery banks require battery fuses or circuit breaker (with optional status con-
19
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Battery Installation
2.3.6 Battery Temperature Sensor (Optional)
The optional external battery temperature sensor kit contains one probe and one temperature trans-
Figure 7 Single temperature sensor and monitor board-U2
Name: W2 L=5m
Temperature
Sensor
Monitor
Board
– U2
Name: W1 L=30m
X7
NC
+
IN
-
-12V
BAT-T
GND
12V
OUT
GND
TMP-2
UPS
Cable W2 is packed with the temperature sensor.
2.3.7 Moving the Battery Cabinets
WARNING
!
Ensure any lifting equipment used in moving the cabinet has sufficient lifting capacity.
Ensure that the weight is within the designated surface weight loading of any handling equipment.
Battery cabinets can be handled by means of a fork lift or similar equipment.
NOTE
Care must be taken when maneuvering units fitted with batteries. Keep such moves to a
minimum.
When the equipment has been finally positioned ensure the adjustable feet are set so that the
battery cabinet will remain stationary and stable.
Seismic anchors option is available for anchoring the unit to a concrete floor.
2.3.8 Cable Entry
Cables enter the battery cabinet from the bottom. Cable entry is made possible by removing a blank-
ing piece fitted at the bottom to reveal the cable entry hole.
20
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Battery Installation
Figure 10 Battery cabinet internal layout
Positions of captive nuts for grille mounting
Minimum service space 65mm
B
Captive nut M6
43
29
15
1.
Hex flange
screw M6x16
Detail B
3 Layers:
1 Layer:
Largest battery dimensions:
201x170x190 (LxWxH)
170 10 170 10 170 10 170
Largest battery dimensions:
201x170x190 (LxWxH)
170 10 170
5
15
368
738
All measurements are in millimeters.
AMNXE0NBCSL4BT
23
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Battery Installation
Figure 11 Battery cabinet, bottom entry
12
11
13
4
6
1
7
8
4
6
13
12
8
9
5
AMNXE0NBCSL4BT
3
10
2
Item #
Item Name
Grille steel
Grille steel
Middle pillar
1
2
3
4
Cover module BC Small NXe
Ground bus
5
6
Captive nut M4
7
Captive nut M6
8
Screw flange M6x16
Nut flange M6
9
10
11
12
13
Screw M6x16 countersink
Spring washer M4
Flat washer M4
Screw mushroom head cross M4x12
2.4
Battery Power Cables
2.4.1 Connection Principles
The following notes, in conjunction with the diagrams, illustrate the broad principles to be followed
when fitting and connecting the majority of battery installations.
24
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Battery Installation
2.4.2 Fitting the Batteries
1. In general, at least 10mm (3/8") must be left unobstructed on all vertical sides of the battery
blocks to permit free air movement around the cells.
2. Clearance should be allowed between the top of the cells and the underside of the shelf above (this
is necessary for monitoring and servicing the cells).
3. When installing the batteries on racks always work from the bottom shelf upwards to prevent
raising the centre of gravity.
2.4.3 Connecting the Battery
1. When the battery cabinet is installed on a raised floor the battery power cables and optional circuit
breaker control cables can be routed to the UPS cabinet via the floor of the cabinet. If the UPS and
battery cabinet are located adjacent to each other and located on a solid floor these cables can be
passed between the cabinets via the lifting apertures located in the lower sides of the cabinets.
2. In general it is recommended that the inter-connecting cables be fitted to the batteries within
their particular level before fitting the inter-level connecting cables, followed finally by the cables
to the circuit breaker.
3. An insulating shroud should be fitted to each terminal after its connection has been made.
4. When connecting the cables between the battery string ends to the optional circuit breaker always
connect the circuit breaker end of the cable first.
2.4.4 Battery Room Design
Whatever the type of mounting system selected, the following conditions should be noted:
Whichever battery mounting system is used, the batteries should be arranged to prevent the pos-
sibility of simultaneous contact with two exposed live parts having a potential greater an 150V.
Where this is not possible, insulated terminal shields must be installed and insulated cables must
be used for connections.
The service platform (or duckboard) must be slip-proof, insulated from the floor and at least one
metre (39 in.) wide.
• Connections—3
All connections must be as short as possible.
The battery circuit breaker is generally installed at the front of the battery room. See 2.5 - Bat-
tery Control for details on connecting the circuit breaker box available for the Liebert NX.
Figure 12 Battery room design
4
1
3
2
2.5
Battery Control
Battery temperature sensor cables are connected between UPS auxiliary terminal block X3 BCB, the
Cables connected to X3 BCB must contain a protective earth wire or a shield, be segregated from
power circuits, double insulated and of a typical 0.5 to 1mm2 cross section area for maximum runs
between 25 and 50 meters respectively. The shield should be connected to the protective earth of the
battery cabinet or battery breaker, not at the UPS
25
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UPS Multi-Module Installation
3.0 UPS MULTI-MODULE INSTALLATION
3.1
General
The installation of a multi-module UPS configuration must follow the installation procedure for a sin-
gle UPS module with the additional requirements detailed in this chapter.
In addition to the local EPO push button on the front panel of the UPS module (that stops operation of
that module), the UPS supports also a remote emergency stop to permit simultaneous multi-module
shutdown.
NOTES
1. The remote emergency power off switch must be voltage-free and Normally Open or
Normally Closed.
2. The open voltage supplied is 12VDC, < 20mA
3. This external emergency stop may be supplied with a second set of contacts that can be used
to trip incoming mains or bypass supply circuit breakers supplied by others and fitted with
remote trip units.
4. Normally Closed EPO - X2: 1&2, these terminals are supplied factory-linked on the monitor
board.
Figure 13 Emergency power off connections
UPS2
X2:3
Monitor Board
X2:4
X2:3
X2:4
Monitor Board
UPS1
EPO
UPS2
X2:1
X2:2
Monitor Board
X2:1
X2:2
Monitor Board
UPS1
EPO
26
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UPS Multi-Module Installation
3.2
Paralleled UPS Modules
The basic installation procedure of a parallel system comprising two or more UPS modules is the
same as that of single module system. The following sections only introduce the installation proce-
dures specific to the parallel system.
3.2.1 Cabinet Installation
(external bypass cabinet) is optional but recommended for ease of maintenance and system testing.
Figure 14 Typical 1+N system block diagram with common input supply, with separate batteries and
optional output / bypass distribution panel
SUPPLIED BY OTHERS
INPUT MAINS
INPUT MAINS
SUPPLY L1, L2, L3, N
SUPPLY L1, L2, L3, N
CB1
CB1
UPS1
UPS2
RECTIFER
RECTIFER
SW1-C
SW1-C
FUSES
FUSES
STATIC
SWITCH
STATIC
SWITCH
CHARGER
CHARGER
BATTERY 2
BATTERY 1
INVERTER
INVERTER
SW1-D
SW1-A
SW1-A
L1, L2, L3, N
L1, L2, L3, N
Q2EXT
Q1EXT
QBYP
QUPS
Distribution Cabinet
TO LOAD
27
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UPS Multi-Module Installation
Figure 15 Dry contacts, multiple UPS modules with distribution panel
Input Distribution
UPS 1
UPS 2
UPS N
M3 Board
M3 Board
M3 Board
X3
X3
X3
Ext. Maint. Ext. Out
Ext. Maint. Ext. Out
Ext. Maint. Ext. Out
1 2 3 4
1 2 3 4
1 2 3 4
Q1Ext
Q2Ext
QnExt
QByp
Distribution Panel
QUPS
To Load
3.2.2 External Protective Devices
3.2.3 Power Cables
The wiring of power cables is similar to that of single module system. The Bypass and the Main input
sources must be referenced to the same neutral potential and input earth leakage monitoring devices,
if installed, must be located upstream of the common neutral sinking point. Refer to the instructions
NOTE
The length and specification of power cables including the bypass input cables and UPS output
cables should be the same. This facilitates load sharing when operating in bypass mode.
28
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UPS Multi-Module Installation
3.2.4 Control Cables
Intermodule Control
Shielded and double insulated control cables available in lengths of 5, 10 and 15 meters must be must
be interconnected in a ring configuration between UPS modules as shown below. The parallel control
Figure 16 Connection of 1+N system parallel control cables
UPS
1
2
3
4
5
6
Parallel Board
Parallel Board
Parallel Board
Parallel Board
Parallel Board
Parallel Board
X3
X3
X3
X3
X3
X3
P5
X4
P5
X4
P5
X4
P5
X4
P5
X4
P5
X4
X2-2 X2-1
X2-2 X2-1
X2-2 X2-1
X2-2 X2-1
X2-2 X2-1
X2-2 X2-1
X1-1 X1-2
X1-1 X1-2
X1-1 X1-2
X1-1 X1-2
X1-1 X1-2
X1-1 X1-2
3.3
Hot-Standby UPS Modules
3.3.1 Cabinet Installation
Place the UPS modules side by side and interconnect as shown below.
The hot standby mode comprises two series connected UPS modules of the same rating. One module
is designated as the hot standby master (downstream), and the other module is designated as the hot
standby slave (upstream). Their roles are determined by power connection and configuration soft-
ware. In normal operation, both slave and master operate in normal mode and the output from one
upstream (slave) UPS feeds the bypass input to the other (downstream/master) UPS. The output of
the downstream (master) UPS is connected to the critical load and is always synchronised to the out-
put of the upstream (slave) UPS. If the inverter of the UPS connected to the load fails, the inverter of
the upstream (slave) UPS supplies the load through the downstream (master) UPS bypass circuit.
The system can be programmed to cycle the downstream (master) UPS between normal mode and
bypass mode so that both ups are equally exercised.
NOTE
If it is a hot-standby system, the master (downstream) must be turned on first.
3.3.2 External Protective Devices
29
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UPS Multi-Module Installation
3.3.3 Power Cables
The wiring of power cables is similar to that of single module system except that the output of the
upstream UPS is fed into the bypass input of the downstream UPS, and the load is fed by the down-
stream UPS through its inverter or bypass. The bypass and the main input sources must be refer-
enced to the same neutral potential and input earth leakage monitoring devices, if installed, must be
located upstream of the common neutral sinking point. Refer to the instructions in 1.0 - Single Mod-
No control wires other than those specified for the single module configuration are required.
Figure 17 Hot standby configuration
INPUT DISTRIBUTION
UPSTREAM
DOWNSTREAM
Bypass L1,
L2, L3, N
Bypass L1,
L2, L3, N
Mains L1,
L2, L3, N
Mains L1,
L2, L3, N
CB1
CB1
RECTIFIER
STATIC
SWITCH
INVERTER
L1, L2, L3, N
L1, L2, L3, N
UPS1
OUTPUT
TO LOAD
30
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UPS Multi-Module Installation
3.4
Dual Bus System
3.4.1 Cabinet Installation
The Dual Bus System consists of two independent UPS configurations each consisting of one or more
UPS modules. Dual Bus Systems are high availability configurations suitable for loads with multiple
input terminals. For single input loads an optional Static Transfer Switch may be added and the stan-
dard Load Bus Synchroniser activated. Depending on the configuration, follow the appropriate instal-
lation instructions for each system.
Place the UPS modules side by side and interconnect as shown below.
The objective of the Dual-bus Synchronizer (DBS) is to keep the output of two independent UPS sys-
tems (or parallel systems) in synchronization. One system is designated as the master; the other is
designated as the slave. The operating modes covered comprise master and or slave operating
inverter or bypass mode.
Figure 18 Typical dual bus system configuration with static transfer switch and Load Bus Synch
Bypass
supply
Bypass
supply
Input
Input
Rectifier
Input
Input
Rectifier
Rectifier
Rectifier
UPS1
UPS1
UPS 6
UPS 6
LBS
Intermodule
control cable
Intermodule
control cable
STS
Load
3.4.2 External Protective Devices
3.4.3 Power Cables
The wiring of power cables is similar to that of single module system. The Bypass and the Main input
sources must be referenced to the same neutral potential and input earth leakage monitoring devices,
if installed, must be located upstream of the common neutral sinking point. Refer to the instructions
31
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UPS Multi-Module Installation
3.4.4 Control Wires
For Liebert NX to NX dual bus configuration, interconnect the optional DBS cable between any DBS
Figure 19 Connections of a typical dual bus system utilising Load Bus Synch
UPS
UPS
Parallel Board
Parallel Board
Parallel Board
Parallel Board
X3
X3
X3
X3
P5
X4
P5
X4
P5
X4
P5
X4
DBS Cable
X2-2 X2-1
X2-2 X2-1
X2-2 X2-1
X2-2 X2-1
X1-1 X1-2
X1-1 X1-2
X1-1 X1-2
X1-1 X1-2
8
8
Parallel System I
Parallel System II
A
B
NOTE
Example shown with ring control cables ("8") for DSB applied to two 1+1 paralleled systems.
3.4.5 Extended Dual Bus Synchronization Option (DBS Interface Box)
For Liebert NX to non- NX (whether another Liebert UPS range or not) dual bus configuration, one
DBS interface box shall be mounted on the non- Liebert NX UPS. In this situation, the other UPS sys-
tem is always treated as a master and the following conditions are covered:
• Master and slave are both on inverter
• Master on bypass, slave on inverter
NOTE
Extended DBS interface box is also used for extending DBS cable length up to
150 meters (490ft) for DBS configuration between two groups of NX UPS systems.
32
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Installation Drawings
4.0 INSTALLATION DRAWINGS
Figure 20 Electrical connections
Earth
To Customer’s Safety
Earth
UPS
A
B
C
N
Ext. Maint.
Parallel Board
X3
To Critical Load
Ext. Out
Power
Cables
A
B
C
N
Main/Bypass Input
Supply
Modem-
SNMP
Monitor Board
X5
RS-485
X4
J4
Input
MBC
J13
Gen
X3
BPS
AFC
X1
J21
J25
J26
J30
J28-1
J28-2
J28-3
J28-4
X2 Ext EPO
External Battery
X7
X3
-
N
+
BCB
Batt
33
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Installation Drawings
Figure 21 General arrangement—10-30kVA UPS module
600
700
10mm dia threaded
mounting holes
2
7
86.5
1
Leve
Detail A, rear of unit
shown without side panel
Leveling feet
90
LEFT SIDE VIEW
FRONT VIEW
420
180
5
4
3
867.5
708
572
6
1380
166
210
236
346
520
625
BOTTOM VIEW
1) Air inlet grille
2) Air outlet grille
TOP VIEW
3) Adjustable fixing feet
4) Castors for maneuvering
5) Seismic anchors (option)
6) Cable entry
All dimensions are in mm.
7) Operator control and display panel
34
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Installation Drawings
Figure 22 10-30kVA NX front view with doors open
1) Main/Bypass Input terminal (T1)
2) Battery /Output terminal (T2)
3) Input circuit breaker (CB1)
4) Rotary switch (SW1)
5
5) Monitor board (U2)
4
3
2
1
T2
External Battery Input
Output
T1
Main Input
Bypass Input
35
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Installation Drawings
Figure 24 Internal battery layout and connecting—GP12120 F2 (12AH/12V)
BOTTOM LAYER
TOP LAYER
Layer 1
Layer 5
Layer 4
Layer 3
Layer 2
43
41
44
42
W501 4pcs
W500
34Pcs
7 7
5 5
3 3
1 1
W503
W502
W511
W510
W515
W514
W513
W512
BLK
BLK
BLK
BLK
W506
W508
W509 W505
W507
J2
+BATT IN
J4
J6
-BATT IN
NIN
NOTE 1. TYPICAL USED FOR:GP 12120 F2 (12AH/12V)
BATTERY INTERCONNECT
WIRING DIAGRAM
A2 BOARD
UPS MODULE
2. REMOVE 43&44 WHEN 42 JARS ARE USED.
REMOVE 41~44 WHEN 40 JARS ARE USED.
Figure 25 Internal battery layout and connecting—LC-R127R2PG1 (7.2AH/12V)
BOTTOM LAYER
TOP LAYER
Layer 1
Layer 5
Layer 4
Layer 3
Layer 2
W520
W517
W501 4Pcs
W500
68Pcs
W516
W518
W519
W521
7 7
5 5
BLK W510
3 3
1 1
W513 BLK W512
W502
W503
W511
W514
W515
BLK
BLK
W506
W508
W509
W507
W505
J2
J4
J6
-BATT IN
NIN
BATTERY INTERCONNECT
WIRING DIAGRAM
+BATT IN
A2 BOARD
UPS MODULE
NOTE
1
TYPICAL USED FOR: LC-R127R2PG1 (7.2AH/12V)
37
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Operation
5.0 OPERATION
WARNING
!
Hazardous Mains and / or Battery Voltage present behind covers.
No user-serviceable parts are located behind covers that require a tool for their removal. Only
qualified service personnel are authorised to remove such covers.
5.1
Introduction
Liebert’s NX™ Uninterruptible Power System system provides continuous, high-quality AC power to
your business-critical equipment, such as telecommunications and data processing equipment. The
NX UPS supplies power that is free of the disturbances and variations in voltage and frequency com-
mon to utility power, which is subject to brownouts, blackouts, surges and sags.
The NX utilizes the latest in high frequency, double-conversion pulse width modulation (PWM) tech-
nology and fully digital controls to enhance its reliability and increase the ease of use.
The standard NX consists of the UPS and internal batteries in a compact, single cabinet.
As shown in Figure 27, the AC utility source is input at CB1 and the rectifier converts the AC utility
into DC power. The inverter converts that DC power from the utility—or DC power from the batteries
—into AC power for the load. The batteries power the load through the inverter in the event of a
power failure. The utility source can also power the load through the static bypass.
If maintenance or repair of the UPS is necessary, the load can be switched without interruption in
service to the maintenance bypass.
Figure 27 Single unit block diagram with split-bypass input
SW1/D
Maintenance Bypass
Static Swich
Bypass
SW1/C
Input
UPS
Output
AC Utility
Input
SW1/A
SW1/B
CB1
Static Swich
Rectifier
Inverter
Discharge
Neutral
Wire
Battery
Charger
Neutral
Wire
Battery
5.1.1 Split-Bypass Input
a separate power switch to a dedicated bypass power source that also feeds the maintenance bypass
line connects the static bypass line. Where a separate power source is not available, the bypass and
rectifier input supply connections are linked.
39
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Operation
5.1.2 Static Transfer Switch
The circuit blocks labeled Static Switch in Figure 27 contain electronically controlled switching cir-
cuits that enable the critical load to be connected to either the inverter output or to a bypass power
source via the static bypass line. During normal system operation the load is connected to the
inverter; but in the event of a UPS overload or inverter failure, the load is automatically transferred
to the static bypass line.
To provide a clean (no-break) load transfer between the inverter output and static bypass line, the
static switch activates, connecting the load to bypass. To achieve this, the inverter output and bypass
supply must be fully synchronized during normal operating conditions. This is achieved through the
inverter control electronics, which make the inverter frequency track that of the static bypass supply,
provided that the bypass remains within an acceptable frequency window.
A manually controlled, maintenance bypass supply is incorporated into the UPS design. It enables the
critical load to be powered from the utility (bypass) supply while the UPS is shut down for routine
maintenance.
NOTE
When the UPS is operating in bypass mode or on maintenance bypass, the connected
equipment is not protected from power failures or surges and sags.
5.1.3 Battery Temperature Compensation
For 10-30kVA UPS with internal batteries, a standard temperature probe is installed to measure the
internal battery temperature to optimize battery management. The measured temperature can be
displayed from the UPS front panel.
For UPS with external batteries, an optional battery temperature interface equally optimises the
external battery management by connecting up to four external temperature sensors from the battery
cabinet(s) to a control unit inside the UPS.
Figure 28 Multiple battery temperature sensors
Temperature
Sensor
X103
NC
+
IN
-
12V
OUT
GND
TMP-2
Temperature
Sensor
X104
NC
+
IN
-
12V
OUT
GND
TMP-2
Monitor
Board
– U2
X7
X108
+12V
OUT
Temperature
Sensor
-12V
BAT-T
GND
GND
X105
NC
UPS
+
IN
-
12V
OUT
GND
TMP-2
BCB Control
Board – C2
Temperature
Sensor
X106
NC
+
IN
-
12V
OUT
GND
TMP-2
BCB Box
40
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Operation
5.1.4 Redundant Control Power Supply Board
The UPS is equipped with two identical and fully redundant control power supply boards. Each of
them takes inputs from the AC and DC sources. When one of the sources or even if one of the control
power boards fails, the UPS system can still operate normally. This feature further enhances the reli-
ability of the system.
5.1.5 Socket Outlet
One single-phase Shuko-type universal outlet of 3A current handling capability provides nominal
UPS output voltage of up to 3A current capacity for the ease of testing, commissioning & servicing of
the UPS.
5.2
Multi Module UPS—1+N
Multi-module UPS are formed by several “single unit” UPS modules to constitute “1+N”system where
groups of one or more, up to six, single units operate together for the purpose of providing additional
power or reliability or both. The load is equally shared between any paralleled UPS.
Figure 29 1+N multi-module UPS with external maintenance bypass switch
Qin UPS1
Qin UPS2
Qin UPS3
Qin Ext
Byp
Supplied by Others
Input Mains Supply
Input Mains Supply
Bypass Mains Supply
L1,L2,L3,N
Input Mains Supply
Bypass Mains Supply
L1,L2,L3,N
L1,L2,L3,N
L1,L2,L3,N
L1,L2,L3,N
L1,L2,L3,N
CB1
CB1
CB1
RECTIFIER
RECTIFIER
RECTIFIER
STATIC
SWITCH
STATIC
SWITCH
STATIC
SWITCH
INVERTER
INVERTER
INVERTER
UPS3
OUTPUT
UPS1
OUTPUT
UPS2
OUTPUT
L1,L2,L3,N
L1,L2,L3,N
L1,L2,L3,N
Qout UPS3
Qout UPS1
Qout UPS2
Qout all UPS
Distribution Cabinet
Qout Byp
Further, single unit or 1+N groups may be configured as “distributed redundant” systems with inde-
pendent outputs that nevertheless are synchronised through a Load Bus Synchroniser (LBS) so that
critical loads can be seamlessly transferred from one system to another. See 5.3 - Modes of Opera-
tion for more information.
41
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Operation
5.2.1 Features of NX Multi-Module UPS Configurations
1. The hardware and firmware of single module UPS units is completely compatible with the
requirements of a multi-module system. Multi-module configuration is achieved merely through
settings in configuration software.
2. Parallel control cables are connected in a ring, providing both performance and redundancy.
Dual-bus control cables are connected between any two UPS modules of each bus. The intelligent
paralleling logic provides the user with maximum flexibility. For example, shutting down or
starting up UPS modules in a parallel system can be done in any sequence. Transfers between
Normal and Bypass modes of operation are synchronised and self –recovering e.g. following
overloads and their clearance.
3. The total load of the multi-module system can be queried from each module’s LCD display.
5.2.2 Requirements for Paralleling of UPS Modules
A group of paralleled modules behave as if it were one large UPS with the advantage of presenting
higher reliability. In order to assure that all modules are equally utilised and to comply with relevant
wiring rules, the following requirements apply:
1. All UPS modules must be of the same rating and must be connected to the same bypass source.
2. The bypass and the main input sources must be referenced to the same neutral potential.
3. Any RCD, Residual Current monitoring device, if installed, must be of an appropriate setting and
located upstream of the common neutral bonding point. Alternatively, the device must monitor
the combined 4-wire rectifier and split-bypass input currents of the system. Refer to the High
4. The outputs of all UPS modules must be connected to a common output bus.
NOTE
Optional isolation transformers are available for applications where sources do not share the
same neutral reference or where the neutral is not available.
5.3
Modes of Operation
The NX UPS is an on-line, double-conversion, reverse-transfer UPS that permits operation in these
modes:
• Normal Mode
• Battery Mode (Stored Energy Mode)
• Auto-Restart Mode
• Bypass Mode
• Maintenance Mode (Manual Bypass)
• ECO Mode
• Parallel Redundancy Mode
• Hot-Standby Mode
• Frequency Converter Mode
5.3.1 Normal Mode
The UPS inverter continuously supplies the critical AC load. The rectifier/charger derives power from
the AC mains input source and supplies DC power to the inverter while simultaneously FLOAT or
BOOST charging its associated backup battery.
5.3.2 Battery Mode (Stored Energy Mode)
Upon failure of the AC mains input power; the inverter, which obtains power from the battery, sup-
plies the critical AC load. There is no interruption in power to the critical load upon failure or restora-
tion of the AC mains input power after which the “Normal Mode” operation will continue without the
necessity of user intervention.
5.3.3 Auto-Restart Mode
The battery may become exhausted following an extended AC mains failure. The inverter shuts down
when the battery reaches the End Of Discharge voltage (EOD). The UPS may be programmed to
“Auto Recovery after EOD” after a delay time. This mode and any delay time are programmed by the
commissioning engineer.
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Operation
5.3.4 Bypass Mode
If the inverter overload capacity is exceeded, or if the inverter becomes unavailable for any reason,
the static transfer switch will perform a transfer of the load from the inverter to the bypass source,
with no interruption in power to the critical AC load. Should the inverter be asynchronous with the
bypass, the static switch will perform a transfer of the load from the inverter to the bypass with inter-
ruption in power to critical AC load. This is to avoid paralleling of unsynchronised AC sources. This
interruption is programmable but typically set to be less than 3/4 of an electrical cycle, e.g., less than
15ms (50Hz) or less than 12.5ms (60Hz).
5.3.5 Maintenance Mode (Manual Bypass)
A manual bypass switch is available to ensure continuity of supply to the critical load when the UPS
becomes unavailable e.g. during a maintenance procedure. This manual bypass switch is fitted in all
UPS modules and rated for full load of one module.
5.3.6 ECO Mode (Single UPS Only)
IF ECO mode is selected, the double-conversion UPS operation is inhibited at most times for the pur-
pose of saving energy. In this mode of operation, not unlike UPS of line-interactive or stand-by tech-
nology, the bypass is the preferred source and only when the voltage and / or frequency of the bypass
supply are beyond pre-defined and adjustable limits the critical AC load is transferred to the inverter.
This transfer takes place with an interruption of less than 3/4 of an electrical cycle, e.g., less than
15ms (50Hz) or less than 12.5ms (60Hz).
5.3.7 Parallel Redundancy Mode (System Expansion)
For higher capacity or higher reliability or both, the outputs of up to six UPS modules can pro-
grammed for directly paralleling while a built-in parallel controller in each UPS ensures automatic
load sharing.
5.3.8 Hot-Standby Mode
This is an alternative 1+1 redundancy application that ensures higher availability or better usage
control or both. Two UPS are connected in Hot Stand By mode as follows: UPS 1connects to the criti-
cal load, and UPS 2 connects to the bypass of UPS 1. The remaining AC inputs are connected to the
incoming AC mains supply. UPS 1 synchronises to the output of the UPS 2 ensuring uninterrupted
load transfer from UPS 1 to UPS 2 or vice versa. This ensures that any specified load is supplied by a
UPS while still providing a bypass path to cater for overloads. Further, the system can also be pro-
grammed to reverse UPS1 between Normal and Bypass Modes so that each UPS is equally utilised.
This interval is programmable from 1 to 4,320 hours (180 days).
5.3.9 Frequency Converter Mode
The NX UPS can be programmed into frequency converter mode for either 50Hz or 60Hz stable out-
put frequency. The input frequency may vary from 40Hz to 70Hz. In this mode the static bypass oper-
ation is disabled, and the battery becomes optional depending on any requirement to operate in
battery mode (stored energy mode).
43
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Operation
5.4
Battery Management—Set During Commissioning
5.4.1 Normal Function
• Constant charging current—Current can be set up to limit charging power.
• Constant boost voltage boost (if applicable)—Voltage of boost charging can be set as required
by the type of battery.
For Valve Regulated Lead Acid (VRLA) batteries, maximum boost charge voltage should not
exceed 2.4V / cell.
• Float Charge—Voltage of float charging can be set as required by the type of battery.
For VRLA, float charge voltage should be between 2.2V to 2.3V.
• Float Charge Temperature Compensation (optional)—A coefficient of temperature compen-
sation can be as required by the type of battery.
• End of discharge protection (EOD)—If the battery voltage is lower than the EOD, the battery
converter will shut down and the battery is isolated to avoid further battery discharge. EOD is
settable from 1.6V to 1.75V per cell (VRLA) or 0.9 to 1.1 V per cell (NiCd).
• Battery Low Warning Time—Settable between 3 and 60 minutes. The default is 5 minutes.
5.4.2 Advanced Functions (Software Settings Performed by the Commissioning Engineer)
Battery Self-Test and Self-Service
At periodic intervals 20% of the rated capacity of the battery will be discharged automatically. The
minimum amount of load must exceed 20% of the nominal rating of the UPS module. If the load is less
than 20%, auto-discharge cannot be executed. The periodic interval can be set from 30 to 360 days.
The periodic testing can also be inhibited.
• Conditions—Battery float charge for at least 5 hours, load 20~100% of rated UPS capacity
• Trigger—Manually through through the command of Battery Maintenance Test in the LCD
panel or automatically
• Battery Self-Test Interval—30-360 days (default setting is 60 days)
5.5
Battery Protection (settings by commissioning engineer)
Battery Undervoltage Pre-warning
The battery undervoltage pre-warning occurs before the end of discharge. After this pre-warning, the
battery should have the capacity for 3 remaining minutes discharging with full load. The time is user
configured from 3 to 60 minutes.
Battery End of Discharging (EOD) Protection
If the battery voltage is lower than the EOD, the battery converter will be shut down. EOD is settable
from 1.6V to 1.75V per VRLA cell (or 1.0 to 1.1V per NiCd cell).
Battery Isolator Open Warning
If the battery isolator is open, this warning will occur.
The external battery to the UPS through an external battery isolator, which is manually closed and
electronically tripped via the UPS control circuits.
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Operating Procedures
6.0 OPERATING PROCEDURES
WARNING
!
Hazardous mains and / or battery voltage present behind covers.
No user-serviceable parts are located behind covers that require a tool for their removal. Only
qualified service personnel are authorised to remove such covers.
6.1
Introduction
switching between modes, resetting the UPS, switching the inverter On and Off and performing other
operations.
Table 9
UPS operating modes
Rotary Switch
Position
Operating Mode
Description
Normal Operation
NORMAL
The UPS is powering the load.
The load power is supplied through the static bypass line. This may be
considered as a temporary mode during load transfers between inverter
and maintenance bypass or supply under abnormal operating conditions.
BYPASS or
NORMAL
On Static Bypass
On Test
No load power is supplied by the UPS. The load is connected to utility
power via the Maintenance Bypass Supply line. NOTE: The load is not
protected against disturbances in AC input power in this mode.
TEST
The UPS is shut down but the load is connected to utility power via the
Maintenance Bypass Supply line. NOTE: The load is not protected
against disturbances in AC input power in this mode.
On Maintenance
Bypass
MAINT
NOTE
2. The audible alarm may sound at various points during these procedures. It can be canceled
at any time by pressing the SILENCE ON/OFF push button.
NOTE
This unit refers to some modes and conditions that are set or adjusted using proprietary service
software. To take advantage of all the available features for the NX, the unit must be
commissioned by a Liebert factory-trained service engineer.
6.1.1 Power Switches
The UPS unit power switches are CB1 and SW1.
• CB1-Input Current Breaker. Connects the utility supply to the UPS input.
• SW1 - Rotary switch. Has four positions—NORMAL, BYPASS, TEST and MAINT—that corre-
spond to different positions of the SW1-A/B/C/D.
The positions of the rotary switch (SW1) are:
• SW1-A—Output Isolator. Connects the output of the UPS to the load.
• SW1-B—Neutral Isolator. Connects neutral to the UPS.
• SW1-C—Bypass Isolator. Connects the UPS with the bypass supply.
• SW1-D—Maintenance Bypass Isolator. Permits supply of the load directly by the bypass line for
maintenance of the UPS unit.
Table 10
Rotary switch configurations
Rotary Switch
Position
MAINT
(SW1-D)
OUTPUT (SW1-A) BYPASS (SW1-C)
NEUTRAL (SW1-B)
NORMAL
BYPASS
TEST
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
MAINT
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Operating Procedures
6.2
UPS Startup
The NX must be fully installed and commissioned before startup, and external power isolators must
be closed. Once those general conditions are met, the UPS may be started.
6.2.1 Start-Up Procedure
To start the UPS from a fully powered-down condition:
1. Open the UPS door to gain access to the main power switches.
WARNING
!
During this procedure the output terminals will become live.
If any load equipment is connected to the UPS output terminals, please check with the load
user and ascertain whether it is safe to apply power to the load. If the load is not ready to
receive power, then ensure that it is safely isolated from the UPS output terminals.
CAUTION
!
Do not operate the rotary switch too fast. Always wait at least 30 seconds when rotating the
switch from one position to another
2. Close CB1.
3. Turn the rotary switch to TEST.
The bypass static SCR (M2) closes automatically and the LCD begins to show start-up screens.
The rectifier indicator flashes green while the rectifier is starting up. It stops flashing and
becomes solid green about 30 seconds after the rectifier enters the normal operation state. After
initialization, the bypass static switch closes.
Because output switch SW1-A is still open, the UPS channels power through Maintenance Bypass
Supply line (SW1-D). The bypass indicator extinguishes, provided that the bypass is normal.
The UPS mimic display indicators will be:
State
Off
Indicator
Rectifier indicator
Battery indicator
Bypass indicator
Inverter indicator
Load indicator
Status indicator
Off
Off
Off
Off
Off
WARNING
!
Do NOT turn the rotary switch until the rectifier indicator stops flashing green.
4. Turn the rotary switch to BYPASS.
State
Green
Off
Indicator
Rectifier indicator
Battery indicator
Bypass indicator
Inverter indicator
Load indicator
Status indicator
Green
Off
Green
Amber
The maintenance switch SW1-D opens and output switch SW1-A closes. The UPS powers from
static bypass instead of from maintenance bypass. The bypass and load indicators turn on. The
design of the rotary switch ensures uninterrupted output.
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Operating Procedures
5. Turn the rotary switch to NORMAL, then press the INVERTER ON control button for 2 seconds.
The inverter will start and the inverter indicator will flash green. After the inverter is ready, the
UPS transfers from bypass to inverter, the bypass indicator turns off and the inverter and load
indicators turn on.
The UPS is operating normally. The UPS mimic display indicators will:
State
Green
Off
Indicator
Rectifier indicator
Battery indicator
Bypass indicator
Inverter indicator
Output indicator
Status indicator
Off
Green
Green
Green
6.2.2 Verify Switching Between Operation Modes
Switch from normal mode to battery mode
• Open CB1 to enter battery mode. This breaks the utility connection to the NX.
To return to normal mode, wait a few seconds and close CB1. The rectifier will restart automati-
cally after 10 seconds and resume feeding power to the inverter.
Switch from Normal Mode to Bypass Mode
• Press INVERTER OFF button to switch to bypass mode.
NOTE
In bypass mode, the load is being powered by the utility and is not receiving conditioned power
through the inverter.
Switch from Bypass Mode to Normal Mode
• Turn the rotary switch to NORMAL.
• In bypass mode, press the INVERTER ON button. When the inverter is ready, the UPS will
switch to normal mode.
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Operating Procedures
6.3
Switching the UPS from Normal to Maintenance Bypass
Follow the procedure below to transfer the load from the inverter output to the Maintenance Bypass
line of the UPS.
CAUTION
!
Before performing this operation, read the messages on the LCD to be sure that bypass supply
is regular and the inverter is synchronous with it. If those conditions are not present, there is
a risk of a short interruption in powering the load.
This procedure assumes that UPS is operating normally.
1. Press the INVERTER OFF button on the right side of the operator control panel for longer than 2
seconds.
The Inverter indicator will turn off and the status indicator (6) will turn amber and an audible
alarm will sound. The load will transfer to static bypass and the inverter will shut off.
NOTE
Pressing the Alarm Silence Switch cancels the audible alarm, but leaves the warning message
displayed until the appropriate condition is rectified.
2. Open the UPS door to gain access to the main power switches, SW1 and CB1.
3. Turn the rotary switch to BYPASS position. The UPS Bypass Static Switch still supply power to
load.
4. Turn the rotary switch to TEST. The load is now on maintenance bypass.
5. Turn the rotary switch to MAINT.
6. Open rectifier switch CB1. All operator indicators and messages will turn off as the utility driven
internal power supplies decay. The unit will power down, but the load will continue to be supplied
by the manual maintenance bypass.
WARNING
!
Wait 5 minutes for the internal DC busbar capacitors to discharge before attempting to
remove the internal protective barriers.
WARNING
!
Even with the UPS rotary switch in maintenance bypass position portions of the unit are still
energized. Service is to be performed by qualified personnel only.
CAUTION
!
The load equipment is not protected from normal supply aberrations when operating in the
maintenance bypass mode.
6.4
Powering Down the UPS
To power down the UPS completely, follow the procedures in 6.3 - Switching the UPS from Nor-
To completely isolate the UPS from the AC supplies, the main external power input isolator (both iso-
lators, where separate supplies are provided for rectifier and bypass) should be opened (see
WARNING
!
To prevent injury to personnel, lockout or tagout the service supplies.
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Operating Procedures
6.5
Powering Down the UPS and Maintaining Power to Load
NOTE
An external Maintenance Bypass Cabinet must be installed before attempting to perform the
following procedure
If the UPS needs to be shut down completely while maintaining power to the load, follow these steps:
2. Close the external maintenance bypass rotary switch to Maint position.
WARNING
!
On the primary input distribution panel, which is often located distant from the UPS area, a
label should be posted advising service personnel that the UPS circuit is under maintenance.
WARNING
!
Wait 5 minutes for the internal DC busbar capacitors to discharge.
The UPS is now completely powered down.
NOTE
The maintenance bypass power switch may be operated at any time while the UPS is powered
down to connect the load to the maintenance bypass supply if required
The procedure can be performed only after the installation has been completed (which includes the
maintenance bypass cabinet), after the system has been placed in operation by authorized personnel.
Figure 30 Example of configuration for single UPS with external maintenance bypass cabinet.
CB1
SW
CB2
3P
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Operating Procedures
6.6
Emergency Shutdown With EPO
This circuit has been designed to switch off the UPS in emergency conditions (i.e., fire, flood, etc.). The
system will turn off the rectifier, inverter and stop powering the load immediately (including the
inverter and bypass), and the battery stops charging or discharging.
If the input utility is present, the UPS’s controls will remain active; however, the output will be
turned off. To remove all power from the UPS, the external feeder breaker should be opened.
6.7
Auto Restart
When the main and bypass sources fail, the UPS draws power from the battery system to supply the
load until the batteries are depleted. When the UPS reaches its end of discharge (EOD) threshold, it
will shut down.
The UPS will automatically restart and enable output power:
• After utility power is restored
• If “Auto Recovery after EOD Enabling” is enabled
• After the “Auto Recovery after EOD Delay Time” expires (the default delay is 10 minutes).
If the “Auto Recovery after EOD Enabling” feature is disabled, the user may restart the system man-
ually by pressing “Fault Clear” button.
6.8
Reset After Shutdown for Emergency Stop (EPO Action) or Other Conditions
Once all appropriate measures have been taken to correct the problem indicated by the alarm mes-
sage appearing on the operator control panel display, carry out this procedure to restore the UPS to
regular operation following an EPO action or for the following reasons: Inverter Overtemperature,
Cut-off Overload, Battery Overvoltage, excessive switching (BYP: XFER COUNT BLOCK), etc.
When the user confirms that the fault is cleared:
1. Press the FAULT CLEAR button to let the system exit the Emergency Off state.
2. Press the INVERTER ON button on the right side of the operator control panel for longer than
2 seconds.
NOTE
The rectifier will start again, and the bypass will begin to power the load (for units with
internal battery contactor installed, the battery contactor will close). The Rectifier indicator
flashes while the rectifier is starting up. When the rectifier enters the normal operation state
(about 30 seconds), the rectifier indicator turns green.
NOTE
The rectifier will be turned On automatically when the overtemperature fault disappears at
5 minutes after the disappearance of overtemperature signals.
After the EPO button is pressed, if the input utility is removed, the UPS will shut down completely.
When input utility is returned, if the rotary switch (SW1) is in either Bypass or in Normal position,
the UPS will start up on Bypass. There will be power at the output terminals of the UPS.
WARNING
!
If the rotary switch is in the Maint. position and input utility is present, there will be power at
the output terminals of the UPS.
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Operating Procedures
6.9
Language Selection
The LCD menus and data display are available in 12 languages: Chinese, Dutch, English, French,
German, Italian, Japanese, Polish, Portuguese, Russian, Spanish and Swedish.To select a different
language than the one being displayed:
1. From the main menu, press the F1 (shift) key to move the cursor to the menu at the top of the
screen.
2. Press F2 and F3 (left and right arrows) as needed to select the Language menu.
3. Press F1 (shift) to move the cursor to the data and settings area of the LCD.
4. Use F2 and F3 (up and down) to select the required language.
5. Press the F4 (enter) key to accept the language selection.
6. Return to the main menu by repeatedly pressing F1 (ESC) as needed; all text on the LCD will now
be displayed in the selected language.
6.10 Changing the Current Date and Time
To change the system date and time:
1. From the main menu, press the F1 (shift) key to move the cursor to the menu at the top of the
screen.
2. Press F2 and F3 (left and right arrows) as needed to select the Settings menu.
3. Press F1 (shift) to move the cursor to the data and settings area of the LCD.
4. Use F2 and F3 (up and down) to select the Date & Time option, then press F4 (enter).
5. Position the cursor on the row in which the date and time are displayed, then press F4 (enter).
6. Using the F2 and F3 (up and down) keys, enter the current time and date information.
7. Press F4 (enter) to save the settings, then press F1 (ESC) to return to the main menu.
6.11 Command Password
Password protection is used to limit the control functions accessible to the operator. The default pass-
word is 12345. This password provides access to UPS and battery test functions.
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Operating Procedures
6.12 Isolating One Module in a Multi-Module System
NOTE
The Multi-Module system must have at least one UPS module redundant in the system and
have an external output breaker installed with interlocking cables connected to the UPS
module. The inverter firmware in each UPS in the system must be I140 or greater.
1. With all UPS modules in the system in Normal mode, open the external output isolator.
NOTE
Opening the external output isolator under these condtions puts the UPS module into Standby
mode. This is indicated by a flashing inverter LED and the message “Check UPS output.”
An “Inverter asynchronous” alarm is also normal. The remaining UPS modules will remain on
line and “Parallel comm fail” will annunciate.
2. Press the UPS EPO to isolate the batteries.
3. Open the UPS door to gain access to the main power switches SW1 and CB1.
4. Turn the rotary switch (SW1) to the Bypass position then continue to rotate to Test.
NOTE
With the UPS external output breaker open and auxiliary switches closed the UPS control will
enable the UPS switch to be rotated through “Bypass” without initiating the remaining on line
UPS modules to transfer to Bypass.
5. Open rectifier input breaker CB1.
WARNING
!
Hazardous Battery Voltage
No operator serviceable parts are located behind covers that require a tool for their removal.
Only qualified service personnel are authorised to remove such covers.
The UPS battery and connecting terminals remains energized at hazardous voltage levels at
all times. The battery is located behind protective covers that require a tool for their removal:
inside the UPS cabinet, inside a free-standing battery cabinet or on open racks inside a
dedicated battery room that may be locked.
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Operating Procedures
6.13 Inserting One Module into a Multi-Module System
This procedure is indicated to reintegrate a UPS module that has been previously isolated from other
modules of a group of paralleled UPS modules. It is assumed that the installation is complete, the sys-
tem has been commissioned by authorized personnel and the external power isolators are open.
WARNING
!
Mains voltage will be applied to UPS output terminals.
No operator serviceable parts are located behind covers that require a tool for their removal.
Only qualified service personnel are authorised to remove such covers.
1. Open the UPS door to gain access to the main power switches.
2. Rotate the switch to Test position. The LCD display becomes active.
3. Close the Input breaker CB1
The Rectifier indicator flashes on the UPS mimic panel during the startup of rectifier and
becomes steady green once the rectifier reaches normal operation state after about 30s.
4. Close external battery circuit breaker QF1 (where an external battery is used). This breaker is
located inside the battery cabinet (if used) or is otherwise adjacent to the battery racks
5. Following battery availability being detected by the UPS, the red battery indicator extinguishes
moments after when the battery charger starts operation.
6. Rotate switch to Bypass position
7. Turn the rotary switch to NORMAL.
8. Close external output power isolators.
9. Press the INVERTER ON control button for 2 seconds.
The inverter will startup and the inverter indicator will flash while it synchronizes to the load
voltage and frequency. After the inverter is ready, the UPS connects to the load, the inverter indi-
cator becomes steady green and the output indicator becomes green.
10. Check that no “Warning” message is displayed in the top right corner of the LCD Monitor and the
status of the indicators as follows:
# LED LED Function
Status
1
2
3
4
5
6
Rectifier indicator green
Battery indicator
Bypass indicator
Inverter indicator
Output indicator
Alarm indicator
off
off
green
green
off
The UPS is now operating in NORMAL mode.
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Operator Control Panel and Display
7.0 OPERATOR CONTROL PANEL AND DISPLAY
7.1
Introduction
The operator control panel and display is located on the front door of the UPS. The panel is the access
point for operator control and monitoring of all measured parameters, UPS and battery status and of
event and alarm logs.
Figure 31 UPS control and display panel
The operator control panel is divided into three functional areas
Mimic Power Flow Chart
Graphic LCD monitor with menu keys
Direct Access keys
6
3
Liebert NX
020kVA 3X3
2005-10-22
Single
17:32:20
Normal
Status
8
1
4
5
Bypass
Output
Load
L1-N/L2
L1-N/L2 voltage(V) 229.5
L2-N/L3
229.5
24.5
49.97
397.5
1.00
L3-N/L1
229.5
24.5
49.97
397.5
0.99
EPO
2
L-N current (A)
Frequency(Hz)
L-L voltage(V)
Power Factor
24.5
49.97
397.5
0.99
INVERTER ON
INVERTER OFF
7
Rotary SW. normal pos.
Manual turn on
07-07
07-07
17:24
17:29
07-07
17:30
Normal mode
?
FAULT CLEAR
SILENCE ON/OFF
F1
F2
F3
F4
HELP
Table 11
UPS control and display panel components
Component #
Button
Function
Function
1
2
3
4
5
6
7
8
Rectifier (Input AC to DC)
Battery (DC Back-up)
Bypass Input
EPO
Emergency Power Off button
Inverter start button
Inverter shutdown button
Reset button
Inverter ON
Inverter OFF
Fault Clear
Silence On/Off
—
Inverter (DC to AC)
Load (AC Output)
Audible Alarm Mute
—
UPS Status and Alarm indicator
Audible Alarm (Buzzer)_
Emergency Power Off Button cover
F1-F4, Help
—
LCD Menu keys
—
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Operator Control Panel and Display
7.1.1 Mimic Power Flow
The LEDs mounted on the mimic flow chart represent the various power paths and current UPS oper-
ational status.
Table 12 Rectifier indicator—1
Green
Rectifier in Normal Operation
Flashing
Green
Input AC Normal, but rectifier not operating
Red
Off
Rectifier Failed
Rectifier Not operating, Input AC Not Available or out of normal range
Table 13 Battery indicator—2
Green
Battery Normal, but discharging and powering the load
Flashing
Green
Battery End of Discharge pre-warning
Battery abnormal (Failed, Absent or Polarity Reversed) or Battery
Converter abnormal
(Failed, overcurrent, overtemperature)
Red
Off
Battery and Converter Normal, Battery charging.
Table 14 Bypass indicator—3
Green
Red
Load on Bypass power
Bypass not available, out of normal range or Static bypass switch fault.
Bypass Normal, load not on bypass
Off
Table 15 Inverter indicator—4
Green
Inverter Normal and powering the load
Flashing
Green
Inverter ON, starting up, synchronising,
or standing by (ECO mode)
Red
Off
Inverter failed
Inverter not operating
Table 16 Load indicator—5
Green
Red
UPS output ON and Normal
UPS output ON and Overloaded
UPS output OFF.
Off
Table 17 Status (Alarm) indicator—6
Green
Yellow
Red
Normal Operation
UPS Warning e.g. AC Input Failure
UPS fault e.g. Fuse or Hardware failure
7.1.2 Audible Alarm (Buzzer)
UPS activity is accompanied by the following sounds
Table 18 Audible alarm key
Single beep Direct Access key acknowledgement
One beep
UPS Warning e.g. AC Input Failure
per second
Continuous Fault e.g. Fuse or Hardware failure
beep
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Operator Control Panel and Display
7.1.3 Direct Access Push Buttons (Keys)
Disconnects Power to the Load. Disables rectifier, inverter, static bypass
and battery operation.
Emergency Power Off (EPO)
Inverter ON
Inverter OFF
Fault clear
Enables Inverter Operation
Disables Inverter Operation
Resets blocked UPS functions (subject to any fault being cleared)
Toggle type buzzer mute. Any new fault re-enables the buzzer.
Silence ON/OFF
Press and hold Direct Access key briefly until acknowledged by a single beep.
7.1.4 LCD Monitor and Menu keys
The user-friendly and menu-driven 320 x 240 dot graphic LCD monitor displays real time data and at
the same time stores 512 historical records that can retrieve for reference and diagnosis.
The user can perform commands or easily browse through the input, output, load and battery param-
eters. For quick reference, the UPS status and any warnings are always highlighted without the need
of navigating through the menu. The versions of converter firmware, inverter firmware and internal
monitor firmware can also be displayed on the LCD.
Menu keys F1 to F4 are used to navigate within the graphic LCD monitor windows.
Table 19 Menu key Icons and their meaning
Key
F1
F2
F3
F4
Help
Window Type 1
?
LEFT
RIGHT
HELP
ENTER
Next Data Window
ESC
Window Type 2
Escape
UP
DOWN
Figure 32 Graphic LCD monitor windows and keypad
Liebert NX
20kVA 3X3
2005-10-22
Unit #1
17:32:20
Normal
1 - UPS System
Window
Bypass
Output
2 - UPS Menu
Window
Main
A(AB)
B(BC)
220
C(CA)
220
Vphase V
Iphase A
Freq. Hz
Vline V
P.F.
220
20.5
50.1
380
20.5
50.1
380
20.5
50.1
380
3 - UPS Data
Window
0.99
0.99
0.99
Input breaker closed
Manual turn on
UPS in normal mode
01-12 12:28:16
01-12 12:30:06
01-22 12:30:16
4 - Current Record
Window
?
5 - Keypad Window
F1
F2
F3
F4
HELP
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Operator Control Panel and Display
The function of keys F1 to F4 is shown by a self-explanatory icon as appropriate for the particular
UPS Menu Window (2) to current record window (4) where it would first rest in “Input breaker closed’.
In a similar manner, pressing F2 would move the cursor from the Output data window to the Bypass
data window.
The summary menu tree is shown below. Refer to 7.2 - All Status and Event Messages Displayed
on the UPS Front Panel for a detailed description of each menu item.
Figure 33 Menu tree
Mains (input)
TX Input *
Bypass
Output
TX Output **
L-N voltage (V)
L-N current (A)
Frequency (Hz)
L-L voltage (V)
Power factor
L-N voltage (V)
L-L voltage (V)
L-N voltage (V)
Frequency (Hz)
L-L voltage (V)
L-N voltage (V)
L-N current (A)
Frequency (Hz)
L-L voltage (V)
Power factor
L-N voltage (V)
L-L voltage (V)
System
Battery
Records
Load
Sout (kVA)
Pout (kW)
Qout (kVAR)
Single unit, no
parallel data
Battery voltage (V)
Battery current (A)
(history log)
Sout (kVA)
Pout (kW)
Qout (kVAR)
Loadlevel %
Crest factor
Battery temperature (°C)
Remain Time Min.
Battery capacity (%)
Battery boost charging
Battery float charging
Battery disconnected
Language
Settings
Command
Version
(Choices for
display)
Display contrast
Date format set
Date & time
Battery maintenance test
Battery capacity test
System test
UPS version
UPS model
Comm1 baud rate
Comm2 baud rate
Comm3 baud rate
Communication address
Communication mode
Callback times
Phone No.1
Phone No.2
Phone No.3
Command password
Stop testing
Freshening Charge
Stop Freshening
Charge
* When configured, input transformer voltages are
displayed on the front LCD. When not activated, the
values are hidden.
** When configured, output transformer voltages are
displayed on the front LCD. When not activated, the
values are hidden.
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Operator Control Panel and Display
7.1.5 Detailed Description of Menu Items
UPS System Window: This fixed-pane window displays current time and date and identifies the UPS,
its configuration and its status.
Table 20 UPS system window
Description
Liebert NX
2005-10-22
12:30:36
Explanation
UPS family name
YYYY-MM-DD (see Settings menu for other date formats)
Current Time (24 hr HH:MM:SS format)
30kVA = UPS rated output, 3 x 3 = 3-phase input and output
30kVA-3x3
(Configuration)
Single = single double-conversion unit
ECO = single stand-by unit with double-conversion fall-back
Single, ECO, Master, Slave or Unit # 1 Master = master in a 1+1 Hot Stand By system
Slave = slave in a 1+1 Hot Stand By system
Unit # 1 = of max 6 double-conversion units in a parallel system
(Status)
Normal, Warning or Fault
Normal = UPS operating Normal
Warning = System attention required, e.g. AC Input Failure
Fault = UPS Fuse or Hardware Failure
Menu and Data Window
Use the horizontal arrow keys to navigate between any of the selectable menu and data windows.
Table 21 Descriptions of UPS menus and data window items
Menu
Type
Item Type
Explanation
L-N voltage (V)
L-N current (A)
Frequency (Hz)
L-L voltage (v
Power factor
L-N voltage (V)
L-L voltage (V)
L-N voltage (V)
Frequency (Hz)
L-L voltage (A)
L-N voltage (V)
L-N current (A)
Frequency (Hz)
L-L voltage (V)
Power factor
L-N voltage (V)
L-L voltage (V)
Sout (kVA)
Phase voltage
Phase current
Mains
(input)
Input frequency
Line-line voltage
Power factor
Phase voltage
TX Input
Bypass
Line-line voltage
Phase voltage
Bypass frequency
Line-line voltage
Phase voltage
Phase current
Output
TX Output
Load
Input frequency
Line-line voltage
Power factor
Phase voltage
Line-line voltage
Sout: Apparent power
Pout: Active power
Qout: Reactive power
The percent of the UPS rating load
Output current Crest Factor
Pout (kW)
Qout (kVAR)
Loadlevel %
Crest factor
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Operator Control Panel and Display
Table 21 Descriptions of UPS menus and data window items (continued)
Menu
Type
Item Type
Sout (kVA)
Pout (kW)
Explanation
Sout: Apparent power
Pout: Active power
Qout: Reactive power
System
Qout (kVAR)
When configured as a single unit, UPS has only native load, no system
load.
Single unit, no parallel data
Battery voltage (V)
Battery current (A)
Battery temperature (°C)
Remain Time Min.
Battery boost charging
Battery float charging
Battery disconnected
(history log)
Battery bus voltage
Battery bus current
Internal battery temperature °C
Battery run time remaining
Battery is boost charging
Battery is float charging
Battery is not connected
Displays all records in the history log
Battery
Records
Language
(choices for text displayed) User may select any of 12 languages for LCD text.
Display contrast
Adjust the LCD display contrast
Date format set
Choose the format for date display: M/D/Y, D/M/Y, M/D/Y, Y/M/D
Set the date and time
Date & time
Comm1 baud rate
Comm2 baud rate
Comm3 baud rate
Communication address
Communication mode
Communication baud rate setting for Intellislot 1
Communication baud rate setting for Intellislot 2
Communication baud rate setting for Intellislot 3
This setting is applicable to RS485 communication mode
Communication Mode Setting
Settings
When Intellislot 1 Communication mode is Modem, this parameter sets
the number of times a number is redialed to send an alarm notification.
Callback times
Phone No.1
Phone No.2
When Intellislot 1 Communication mode is Modem, this is the first phone
number to be dialed (to send an alarm notification).
When Intellislot 1 Communication mode is Modem, this is the second
phone number to be dialed (to send an alarm notification).
When Intellislot 1 Communication mode is Modem, this is the third phone
number to be dialed (to send an alarm notification).
Phone No.3
Command password
Battery maintenance test
User can modify the command password.
This test performs a partial discharge of the battery to obtain a rough
estimate of the battery capacity. Load must be between 20% and 100%.
This test performs a full discharge of the battery to obtain a precise
measure of the battery capacity. Load must be between 20% and 100%.
Battery capacity test
System test
Command
(start/stop
battery &
system
This is a self-test of the UPS. When the user activates this function, a pop-
up window appears about 5 seconds later to show the results.
Manually stops a battery maintenance test, battery capacity test or system
test.
Stop testing
tests)
This command will allow a temporary Equalize charge for the batteries.
This charge is configurable for 1 to 36 hours
Freshening Charge
Stop Freshening Charge
UPS version
Manually stop a Freshening Charge
Provides UPS firmware version numbers for the inverter, rectifier and
software display board.
Version
UPS model
Provides UPS model information—for example, 400V-50Hz.
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Operator Control Panel and Display
Current Record Window
Keeps a log the events that resulted in the current mode of operation. Ignores transient conditions
that have been resolved.
Use “page” (F1) and up / down arrow to read the events.
For a complete history log, refer to the Records tab of the Menu and Data Window.
7.2
All Status and Event Messages Displayed on the UPS Front Panel
This is the complete list of UPS events and status messages supported for display in either the Record
window (Historic data) or in the Current window (Prevailing data) as described in 7.1.4 - LCD Moni-
Table 22
Message
UPS messages
Description / Suggested Action (if any)
Inverter Comm. Fail
Rectifier Comm. Fail
Internal RS485 communication failure between monitor and inverter
Internal RS485 communication failure between monitor and rectifier
The CAN communication between different UPSs within a parallel system fails.
1.Check if there are some UPSs not powered on in the parallel system. If so, power on these
UPSs and check if the alarm disappears.
Parallel Comm. Fail
2. Press Fault Clear push button.
Battery Overtemp.
Ambient Overtemp.
Battery Fault
The Battery temperature is over limit. Check the battery temperature and ventilation
The Ambient temperature is over limit. Check the ventilation of UPS room.
Battery detected faulty (Reserved)
Replace Battery
Battery test failed, Battery should be replaced.
Before the end of discharge, battery undervoltage pre-warning should occur. After this pre-
warning, battery should have the capacity for 3 minutes discharging with full load. The time is
user-configured from 3 to 60 minutes.
Battery Low Pre-warning
Shut down the load in time.
Battery End of Discharge
Mains Volt. Abnormal
Inverter turned off due to low battery voltage. Check the utility failure and try to recover it.
Mains Voltage exceeds the upper or lower limit and results in rectifier shutdown.
Check the input line-to-neutral voltage amplitude of rectifier.
Mains Voltage is undervoltage with derated load.
Check the input line-to-line voltage amplitude of rectifier
Mains Undervoltage
Mains frequency is out of limit range and results in rectifier shutdown.
Check the rectifier’s input voltage frequency
Mains Freq. Abnormal
Rectifier Fault
Rectifier detected faulty. Rectifier shuts down. Battery discharges.
The temperature of heat sink is too high to keep the rectifier running.
The UPS can recover automatically. Check the environment and ventilation.
Rectifier Overtemp.
Batt. Contactor Fail
Batt. Charger Fault
Control Power 1 Fail
Mains Phase Reversed
Rectifier Overcurrent
Soft Start Fail
Battery contactor or circuit breaker not responding to control signals.
The voltage of the battery charger is too high.
UPS operates but Redundant Control Power is not available.
AC Input phase sequence is reversed.
Rectifier is overloaded.
Rectifier could not start due to low DC bus voltage
This alarm is triggered by an inverter software routine when the amplitude or frequency of
bypass voltage is beyond the normal range.
The amplitude threshold is fixed for positive and negative 10% rating.
This alarm automatically resets once the bypass voltage goes normal.
1. First verify that the bypass voltage and frequency displayed on the panel is within the
selected range. Note here the rated voltage and frequency are specified by “Output voltage
level” and “Output frequency level” respectively.
Bypass Unable to Trace
2. If the displayed voltage is believed to be abnormal, then verify the bypass voltage and
frequency presented to the UPS. Check the external supply if it is found to be faulty.
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Operator Control Panel and Display
Table 22
Message
UPS messages (continued)
Description / Suggested Action (if any)
This alarm is triggered by an inverter software routine when the amplitude or frequency of
bypass voltage exceeds the limit.
This alarm automatically resets once the bypass voltage goes normal.
First check if there are some relevant alarms such as “Bypass disconnect open”, “Bypass phase
reverse” and “Mains neutral lost”. If they appear, solve them first.
1. Then verify that the bypass voltage and frequency displayed on the panel is within the bypass
limit. Note here the rated voltage and frequency are specified by “Output voltage level” and
“Output frequency level” respectively.
Bypass Abnormal
2. If the displayed voltage is believed to be abnormal, then verify the bypass voltage and
frequency presented to the UPS. Check the external bypass supply if it is found to be faulty. If
the utility is likely to trigger this alarm frequently, the bypass limit can be changed a little larger
through the configuration software according to the customer’s agreement.
This alarm is triggered by an inverter software routine when the inverter and bypass waveforms
are misaligned by more than 6 degrees in phase. This alarm resets automatically once the
condition is no longer true.
1. First check if the alarm “Bypass unable to trace” or “Bypass abnormal” occurs. If so, solve it
first.
Inverter Asynchronous
Inverter Fault
2. Verify the waveform of the bypass voltage. If it is too distorted, ask the customer to verify and
seek any possible measurements.
Inverter output voltage beyond limits. Load transfers to bypass.
The temperature of the inverter heat sink is too high to keep inverter running.
This alarm is triggered by the signal from a temperature monitoring thermostat on the inverter
bridge heat sink.
The UPS will recover automatically after a 5 minute delay from the disappearance of the
overtemperature signal.
If the overtemperature condition is true, then check for and verify:
1. high ambient air temperature.
Inverter Overtemp.
2. blocked cooling airway.
3. any fan failure.
4. prolonged inverter overload
Fan Fault
At least one of the cooling fans has failed
At least one of the static switches of inverter side is open or short circuit. This fault is locked until
power off.
Inverter STS Fail
At least one of the static switches of bypass side is open or short circuit. This fault is locked until
power off
Bypass STS Fail
Operation Invalid
Output Fuse Fail
Control Power 2 Fail
This record is registered following an incorrect operation:
At least one of the inverter output fuses is blown. Inverter shuts down. Load transfers to bypass.
UPS operates but Redundant Control Power is not available.
The UPS is confirmed to be overload when the load arises above 105% nominal rating.
The alarm automatically resets once the overload condition is removed.
1. Confirm that the alarm is true by checking the load percent indicated on the LCD panel to
determine which phase is being overloaded.
Unit Over load
2. If the alarm is true, measure the actual output current to verify that the indications are valid.
Disconnect unnecessary load and ensure the safety. In a parallel system, a severe load sharing
error can also leads to the alarm.
The UPS parallel system is confirmed to overload when the total load arises above 105%
nominal rating for the set basic number of UPSs. The alarm automatically resets once the
overload condition is removed.
1. Confirm that the alarm is true by checking the system load percent indicated on the LCD
panel to determine which phase is being overloaded.
System Over load
2. If the alarm is true, measure the actual output current to verify that the indications are valid.
Disconnect unnecessary load and ensure the safety. In a parallel system, a severe load sharing
error can also leads to the alarm.
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Table 22
Message
UPS messages (continued)
Description / Suggested Action (if any)
The UPS is confirmed to overload and the overload times out.
Note 1: the highest loaded phase will indicate overload timing-out first.
Note 2: When the timer is active then alarm “unit overload” should also be active as the load is
above nominal.
Note 3: When the timer has expired, the inverter Static Switch is opened and the load
transferred to bypass. The inverter shutdown and will restart after 10 seconds.
Note 4: If the load decreases lower than 95% after 5 minutes, the system will transfer back to
inverter mode.
Unit Over load Timeout
Confirm that the alarm is genuine by checking the load percent indicated on the LCD. If an
overload is indicated then check the load, and investigate any additional load connected prior to
the alarm (if applicable).
Byp. Abnormal Shutdown
Inverter Over Current
Both bypass and inverter voltages unavailable. Load interruption
Inverter Pulse Width Modulation module overloaded.
The phase sequence direction of bypass voltage is reversed.
Normally, the phase of phase B lags 120 degrees behind phase A, and the phase of phase C
lags 120 degrees behind phase B.
Bypass Phase Reversed
Verify that the phase rotation of the bypass supply presented to the UPS is correct, and rectify it
if it is found to be in error
A transfer to bypass occurred due to a large step load. The UPS should recover automatically.
Turn on connected equipment in sequential order to reduce the step loading of the inverter.
Load Impact Transfer
Transfer Time-out
The load is on bypass power due to excessive number of transfers that occurred within the last
hour.
The UPS will recover automatically and will transfer the load back to inverter power within an
hour.
Load Sharing Fault
DC Bus Abnormal
UPS modules within a parallel system are not sharing the load current equally.
DC input voltage to inverter beyond limits. Inverter shuts down. Load transfers to bypass.
The whole paralleled UPS system transferred to bypass at the same time. This message will
appear on the UPS which passive transfer to bypass
System Transfer
Malfunction of the paralleling control circuits of this UPS module. Can cause “System Transfer”
to bypass.
Parallel Board Fault
Rectifier, inverter and battery converter were shutdown because DC bus voltage is too high.
Check whether there is a fault in rectifier side. If no, then check whether overload occurs.
Restart the inverter after resetting the fault
DC Bus Over Voltage
Parallel Connect Fault
The parallel cables are not connected correctly in a parallel system.
Reset the fault by pressing the “fault clear” button, then restart the inverter by pressing the
“inverter on” button.
Bypass Over Current
LBS Active
Bypass current is over limit above 135% rating. The UPS just alarms and does nothing.
Load Bus Synchronisation is active. The UPS is acting as an LBS master or slave in a dual bus
configuration.
Setting Save Error
Mains Neutral Lost
Protocol version clash
Battery ground fault
Inv. Turned On Manually
Inv. Turned Off Manually
EPO
History records not saved. (Reserved)
AC Input mains reference neutral not detected.
Firmware incompatibility between Monitor Board and Digital Signal Processor Board.
Battery leakage to ground detected (option)
Manual Turn On via front panel
Manual Turn Off via front panel
Emergency Power Off direct access key pressed or external command received
Prompt to press “enter” key to acknowledge that an interrupted load transfer to bypass will
happen.
Transfer Confirm
Transfer Cancel
Unit Off Confirm
Prompt to press “ESC” key to avoid that an interrupted load transfer to bypass will happen.
Prompt to press “enter” key to acknowledge that the UPS will be disconnected from other
paralleled UPS modules.
Prompt to press “enter” key to acknowledge that the all paralleled UPS will be disconnected
from the load.
System Off Confirm
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Table 22
UPS messages (continued)
Message
Description / Suggested Action (if any)
Fault clear direct access key pressed
Silence On/Off direct access key pressed
Fault Reset
Alarm Silence
Inverter failed to turn on when Inverter On direct access key was pressed. This may be as a
result of Invalid Operation (Maintenance bypass on) or DC bus or rectifier not ready.
Turn On Fail
Alarm Reset
Bypass Mode
Normal Mode
Battery Mode
Fault clear or Silence On/Off direct access key pressed
Load supplied from AC input bypass supply.
Load supplied from Inverter output through double conversion of the AC mains input supply.
Load supplied from Inverter output through double conversion of the Battery supply.
Load supplied from Inverter output through shared double conversion of the AC mains input
supply and of the Battery supply.
Source share mode
UPS Shutdown
UPS Shutdown, output power-down
Check UPS Output
Generator Connected
BCB open
Inverter off during normal startup (diagnostics information only)
Generator active signal received. Source share mode may be activated pending UPS settings.
Battery Circuit Breaker status (open)
BCB closed
Battery Circuit Breaker status (closed)
Battery Float Charging
Battery Boost Charging
Battery Discharging
Battery Period Testing
Batt. Capacity Testing
Batt. Maint. Testing
UPS System Testing
Inverter in Setting
Battery status (Float charge mode)
Battery status (Boost charge mode)
Battery status (discharge mode)
Automatic periodic battery maintenance discharge test (20% capacity discharge)
User initiated battery capacity discharge test (100% capacity discharge)
User initiated maintenance discharge test (20% capacity discharge)
User initiated UPS self test
Inverter starting up and synchronising
Rectifier in Setting
MBP-T cabinet Fan Fault
Ext Input TX Overtemp
Ext Output TX Overtemp
Battery Room Alarm
Rotary Sw. Test Pos.
Rotary Sw. Normal Pos.
Rotary Sw. Bypass Pos.
Rotary Sw. Maint. Pos.
Battery Contactor Open
Battery Contactor Close
Battery Reverse
Rectifier starting up and synchronising
Maintenance bypass cabinet fans fault.
External Input Isolation Transformer Over Temperature
External Output Isolation Transformer Over Temperature
Environment in Battery Room Needs Attention
Rotary switch is in test position.
Rotary switch is in normal position.
Rotary switch is in bypass position.
Rotary switch is in maintenance position.
Battery Contactor Open
Battery Contactor Closed
Connect the battery again and check the wiring of batteries
Check the battery and the wiring of batteries
After UPS was shutdown at EOD, inverter auto starts when utility restore
Rectifier firmware is being update
No Battery
Auto start
Rec. Flash Update
Inv. Flash Update
Inverter firmware is being update
Monitor Flash Update
Input contactor fault
Contactor P.S. 1 fault
Contactor P.S. 2 fault
LBS abnormal
Monitor firmware is being update
Input contactor is in fault
Contactor Power Supply board 1 Fault
Contactor Power Supply board 2 Fault
LBS is abnormal
DSP firmware error
The inverter firmware does not match with the rectifier firmware.
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Operator Control Panel and Display
7.3
Prompt (Pop-Up) Windows
The prompt window is displayed during the operation of the system to alert the user to certain condi-
tions and / or to require user confirmation of a command.
Table 23 Prompt windows, meanings
Prompt
Meaning
Inverter and Bypass supplies are not synchronised and
any load transfer between the supplies will cause a brief
load interruption.
Transfer with interrupt, please confirm or cancel
The total load must be less than the capacity of one unit
to allow a parallel system to perform an interrupted
transfer from bypass to inverter.
The load is too high to be transferred with interrupt
This Operation Leads to Output Shutdown, Confirm or
Cancel
No alternative supply is available and any Inverter Off
operation will cause the load to be de-energised.
This operation leads to inverter overload, confirm or
cancel
The turn-off this inverter will lead to the overload of
remaining inverter(s) in a parallel system.
The number of paralleled inverters already turned on is
insufficient to carry the existing load.
Turn on more UPS to carry current load
Battery will be depleted, confirm
Battery Capacity test discharges the battery 100%
No action required
System self test finished - everything is ok.
System self test finished - Please check the current
warnings.
Check “Current Records” window
Enter control password
Required for Battery or UPS test (default = 12345)
Battery self-test condition is not enough. User should
check whether battery state is boost charging and
whether load level is greater than 20 percent.
Battery Self Test aborted, condition not met
Boost charging condition is not enough, such as (No
battery, charger has failed, etc.).
Battery Refresh Charge aborted, condition not met
7.4
Dynamic Energy Flow Chart and UPS Help Screen
This screen displays a mimic diagram of the UPS that includes energy flow and status of isolation and
transfer switches. Press the “Help” key to activate this screen. Press again to toggle between this
screen and the main screen.
Figure 34 Help screen
Help information
Select the current record window
Select the previous menu item
Press help key back to main menu
F1
F2
F3
F4
HELP
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Operator Control Panel and Display
7.5
Default Screen Saver
This default screen is displayed following at least 2 minutes of operation with no new alarm. After
another delay, the backlight turns off. Press any key (F1-F4 or Help) to reactivate the screen.
Figure 35 Default screen
Liebert NX
20 kVA-3x3
2005-05-22
UNIT #1
12:30:36
NORMAL
Press any key, back to main menu
F1
F2
F3
F4
HELP
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Options—For Assembly Inside the UPS Cabinet
8.0 OPTIONS—FOR ASSEMBLY INSIDE THE UPS CABINET
Several items of optional equipment are available for connection to the Liebert NX UPS. These are
described in this section of the manual and should be fitted prior to installation.
8.1
Protection
8.1.1 Battery Ground Fault Detection
In addition to any residual current device mounted externally and upstream the UPS or when
optional isolation transformers are fitted to the UPS, an optional residual battery current device can
be fitted to detect leakage current from the battery into the PE (Protective Earth) Residual current
range monitored: 30~3000mA.
Power supply voltage for the set: AC230V (L-N);
When a battery ground fault is detected, an alarm will appear on the UPS display panel.
An additional Dry contact fault Alarm signal is available for remote monitoring:
Table 24 Dry contact fault alarm signal is available for remote monitoring
Terminal Name
Definition
Battery Ground Fault Detection – can be
programmed as Alarm or Pre-Alarm
21
Common
22
24
NC
NO
The Battery ground fault detection set contains one CT (current transformer) and one DC sensitive
residual current monitor. The connection of this set for UPS is illustrated as follows.
Figure 36 Battery ground fault detection set connections
Current Transformer
W1-A358 (installed
externally only)
BCB or
Contactor
Battery
X
Batt +
Batt-N
X
Batt -
Monitor Board
K1 K2 I2
I2
-U2
Socket
Output
Phase
4 +12V
A1
11
14
IN DRY-X3
A2
2
Output
Neutral
BtG
Battery Ground
Fault Detection
Resys B470
(AC230)
UPS
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Options—For Assembly Inside the UPS Cabinet
8.1.2 Redundant Fan for Power Module
In addition, to ensure sufficient cooling power at various operation modes with 100% rated load, a
redundant power module fan set can be supplied, thus ensuring continuity of UPS operation even
with the failure of some fans. No extra footprint is required.
Figure 37 Redundant power module fan set
Redundant AC Fan
Standard AC Fan
(AC Fan 1-1)
(AC Fan 1-2)
(AC Fan 1-3)
(AC Fan 1-4)
Fan120
Fan120
Fan120
Fan120
TOP VIEW
Figure 38 Communication bays and cable location
Preferred Device This Location
Location
RS-232-1 DB-9 (COM Port 1) - Serial MultiLink Software
(Port Setting 2400 Baud)
RS-232-2 DB-9 (COM Port 2 - Service Access Software
(Port Setting 9600 Baud)
DB-9
Monitor
Board
Location
Preferred Device This Location
Top Bay
Mid Bay
Bottom Bay
Relay Card (no port setting required)
Multiport4 (no port setting required)
OCWeb LB / OC485 (port setting 2400 Baud)
Top
Mid
Bottom
Suggested routing of customer-supplied
communication cables
Notes:
a) All Intellislot cards are supported in any bay.
b) Port sharing is:
- PERMITTED between RS232-x DB9 devices and Relay /
Multiport4 Intellislot cards (i.e., Serial Multilink software
will work from RS232-1 DB9 also when relay card is
inserted in the top bay.
- NOT PERMITTED between RS-232-x D-B9 devices and
OCWeb / OC485 cards (i.e., Serial MultiLink software will
not work from RS232-1 DB-9 when OCWeb card is inserted
in the top bay.
Gland plate for cable exit
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Options—For Assembly Inside the UPS Cabinet
8.1.3 OC Web Card - SNMP/HTTP Network Interface Card
This network interface card provides all real-time data and status information as SNMPv1 traps for
connection to a 10/100-baseT Ethernet network and in addition the same card will also transmit the
same status information and all measured parameters for display via a Web browser.
This card is supported in the top, middle and bottom Intellislot bays.
Figure 39 OC Web Card data summary window
Figure 40 OC Web Card battery data summary
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Options—For Assembly Inside the UPS Cabinet
8.1.4 Relay Card
The Relay card provides voltage-free contact closures for remote monitoring of alarm conditions.
Delivering On Battery, On Bypass, Low Battery, Summary Alarm, UPS Fault and On UPS signals,
the easy-to-install card integrates with AS/400 computers (additional cable required) and other relay
contact monitoring systems.
The Relay card is rated for 24 VAC/VDC at 1A and supported in any of the three NX Intellislot bays.
Table 25 Relay Card pin configuration
Pin
1
Function
Operation
UPS Fault
Closed if no UPS failure
2-3
4
Not Used
UPS Fault
Closed if UPS fails
5
Summary Alarm**
Summary Alarm**
Any Mode Shutdown return
Not Used
Closed if SUMMARY ALARM** occurs
Closed if no alarm conditions are present
Not Supported– use External EPO terminal
6
7
8
9
Common - Low Battery
Low Battery
10
11
12-13
14
15
16
17
Closed if battery is OK
Low Battery
Closed if LOW BATTERY point occurs.
Not Used
UPS Any Mode Shutdown
On UPS
Not supported– use External EPO terminal
Closed if ON UPS (inverter) power
On Battery
Closed if ON BATTERY power (Utility failure)
Common - UPS Fault, Summary Alarm,
On UPS, On Battery, On Bypass
18
On Battery
Closed if not ON Battery power (Utility OK)
Closed if ON BYPASS
19 ÷ 23 Not Used
24
25
On Bypass
Not Used
**A Summary Alarm occurs when any of the following conditions exist:
• Utility power is out of the acceptable range (voltage and/or frequency)
• UPS is in BYPASS MODE (load not on Inverter power)
• UPS Battery is LOW
• UPS fault has occurred
Table 26 Relay card jumpers
#
Connection
Description
JP01 Pin 9 to Pin 17
JP02 Pin 7 to Pin 17
Allows all relay COMMONS to be tied together.
Irrelevant for NX - (Interconnects all relay COMMONS and the (not
supported) ANY MODE SHUTDOWN Return.
8.1.5 Multiport-4 Card
The Multiport-4 card provides 4 sets of voltage-free contact closures for remote monitoring of alarm
conditions UPS operation On Battery and battery low condition. A typical application is to allows a
maximum of four computer systems to simultaneously monitor the status (e.g., utility power failure /
low battery) of a single UPS.
This card is supported in any of the three NX Intellislot bays.
69
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Options—For Assembly Inside the UPS Cabinet
Figure 41 SiteNet MultiPort4 Intellislot pin configuration
CPU
CPU
CPU
CPU
UPS
Table 27 SiteNet MultiPort4 Intellislot pin assignment
Assignment
Pin
Description
1
Low Battery
2
Not Used
3
Not Used
4
Not Used
5
Not Used
6
Not Used
7
Low Battery Common
Utility Fail Common
Utility Fail
8
9
70
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Options—For Assembly Inside the UPS Cabinet
8.2
OC485 Web Card – Modbus, Jbus, IGM Net
The OpenComms 485 Card facilitates SiteScan Web or Building Management Systems monitoring.
The RS232 port is used for connection to a personal computer for setting up.
The RS-485 port supports IGM Net and Modbus/JBus protocols and maps the operation of the UPS
including status, alarms and data (voltages, currents, frequency, power, power factor, temperatures
etc.)
Figure 42 OC485 Web card
Table 28 NX communication options
On the UPS
LCD screen,
under Settings,
Physical
description
of port
Labeled
ID Name
of Port
Monitoring
Devices
supported
Baud
rate
controlled by:
Comments
Multiport 4
any
any
Relaycard-int
OCWEB-LB
Top
Intellislot
Intellislot 2
(On Monitor Board)
Comm 1
Not simultaneous with
Multilink in RS232-1
2400
Modbus/Jbus
Multiport 4
2400
any
Relaycard-int
OCWEB-LB
any
Middle
Intellislot
Intellislot 1
(On Monitor Board)
Comm 2
Comm 3
Not simultaneous with
Multilink in RS232-2
2400
Modbus/Jbus
Multiport 4
2400
any
Relaycard-int
OCWEB-LB
Modbus/Jbus
Multilink Serial
any
Bottom
Intellislot
Intellislot 3
(On Monitor Board)
2400
2400
Top
DB9 port
Not simultaneous with Web
card in top Intellislot.
RS232-1
RS232-2
Comm 1
Comm 2
9600
9600
Bottom
DB9 port
Service Software
(Reserved)
Not simultaneous with Web
card in middle Intellislot.
8.2.1 Remote Alarm Monitor
Status and alarm conditions are available on an optional remote alarm monitor (RAM) panel that is
driven by volt-free alarm status contacts from an optional relay alarm board.
71
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Options—For Assembly Inside the UPS Cabinet
8.2.2 Dust Filter for 10-30kVA
Installing the two dust filters in the Liebert NX requires only a Phillips screwdriver. Each filter is
held in place by a bracket on either side of each filter. To install each filter:
2. Remove one bracket and loosen the screw on the second bracket. The second bracket need not be
3. Remove the dust filter to be replaced.
4. Insert the clean filter.
5. Reinstall the bracket, tightening the screw securely.
6. Tighten the screw on the second bracket.
Figure 43 Dust filter replacement
Bracket
Sems screw
Bracket
72
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Technical Specifications
9.0 TECHNICAL SPECIFICATIONS
9.1
Conformity and Standards
The UPS has been designed to conform to the following European and international standards:
Table 29 Compliance with European, international standards
Description
Normative reference
General and safety requirements for UPS used in
operator access areas
EN 50091-1-1 /IEC 62040-1-1 / AS 62040-1-1
Electromagnetic compatibility (EMC) requirements for
UPS
EN 50091-2 / IEC 62040-2 / AS 62040-2 (Class A)
EN 50091-3 / IEC 62040-3 / AS 62040-3 (VFI SS 111)
Method of specifying the performance and test
requirements of UPS
standards for safety (IEC/EN/AS60950), electromagnetic emission and immunity (IEC/EN/AS61000
series) and construction (IEC/EN/AS60146 series and 60529).
Table 30 Environmental characteristics
Unit of
Measurement
10
15
20
30
Rated power, kVA
Acoustic Noise Level at 1 Meter (39 in)
dBa
51.0
51.5
51.6
56
≤1000m (3280 ft) above sea level
Altitude of Operation
m (ft)
-
de-rate power by 1% per 100m(328 ft) between
1000 and 2000 m (3280 and 6560 ft)
Relative Humidity
0 to 95% non condensing
0 to 40 (32-104°)
Battery life is halved for every 10° (18°) increase
above 20° (68°)
Operating Temperature
°C (°F)
Storage-Transport Temperature for UPS
°C (°F)
°C (°F)
-20 to 70 (-4 to 158)
Recommended Battery Storage
Temperature
-20 to 30 (-4 to 86)°F)
(20°C [68°F] for optimum battery storage)
Table 31 Overall efficiency, heat losses and air exchange
Unit of
Measurement
10
15
20
30
Rated Power, kVA
Normal Mode (dual conversion)
ECO Mode
%
%
90.4
93.2
91.2
94.2
91.3
94.7
91.9
96.6
Inverter Efficiency (DC/AC)
(battery at nominal voltage 480VDC and full-rated linear load)
Rated Power,
kVA
%
10
15
20
30
Battery Mode
91.3
91.7
92.0
92.5
Heat Loss & Air Exchange (Ventilation)
Rated Power
Normal Mode
ECO Mode
No Load
kVA
kW
kW
kW
10
1.6
1.3
1.3
15
1.8
1.4
1.3
20
2.2
1.4
1.3
30
2.6
1.5
1.3
119
(428)
3
Maximum Forced Air Cooling (front intake, back exhaust)
L/sec (m /hr)
239 (860)
Input and output voltage 400VAC, battery charged, full rated linear load
73
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Technical Specifications
Table 32 Mechanical characteristics
Unit of
Measurement
10
15
20
30
Rated Power, kVA
Dimensions, WxDxH
Mass
600x700x1400
(23-9/16x27-5/8x55)
mm (in)
Mass without batteries
kg (lb)
N/A
180 (397)
204 (450)
204 (450)
210 (463)
Pantone 877 (Silver grey)
Finish
equivalent Becker Silver epoxy polyester powder 041-37-2
Protection Degree, IEC (60529)
N/A
IP20 (finger-proof with front doors open or closed)
Table 33 Rectifier AC input (mains)
Unit of
Measurement
10
15
20
30
Rated Power, kVA
380/400/415
Rated AC Input Voltage
VAC
(3-phase and sharing neutral with the bypass input)
305V to 477V
304V to 208V (output derated below 70%)
2
Input Voltage Tolerance
VAC
Hz
Frequency
50/60Hz (tolerance 40Hz to 70Hz)
0.99 (0.98)
kW/kVA, full
load
Power Factor
(half load)
kVA rated
Input Power
8.9 (11.7)
13.3 (18.9)
17.8 (23.3)
26.6 (35.0)
(maximum )
A rated
Input Current
12.9 (16.9)
3
19.3 (27.4)
3
25.8 (33.8)
3
38.6 (50.7)
3
(maximum )
Harmonic Current Distortion
THDI % FL
Duration of Progressive
Power Walk-In
10 seconds to reach full rated current
(selectable 5 through 30 seconds in 5-second intervals)
sec
1. Rectifier operates at any of the rated supply voltages and frequencies without further adjustment.
2. At 305V input mains the UPS maintains the specified output voltage at rated load without discharging a previously charged
battery
3. IEC 62040-3 / EN 50091-3: at rated load and input voltage 400V, battery charged
4. IEC 62040-3 / EN 50091-3: at rated load and input voltage 400V, battery charging at maximum rated power.
74
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Technical Specifications
Table 34 Battery
Intermediate DC Circuit
10 15
Rated Power,
kVA
Unit of
Measurement
20
30
Battery Bus
Voltage
Nominal: 480V (VRLA Float charge is 540V)
Range: 400V - 616V
VDC
Number of Lead-Acid Cells
Nominal
Maximum
240 = [40 x 6-cell (12V) blocks]
264 = [44 x 6-cell (12V) blocks]
2.25 V/cell (selectable from 2.2 –2.3V/cell)
Constant current and constant voltage (IU) charge mode
Float Voltage
V/cell (VRLA)
Temperature
Compensation
Ripple Voltage
Ripple Current
mV/°C/cl
% V float
- 3.0 (selectable 0 to – 5.0 around 25°C or 30°C. or inhibit)
≤1
≤5
% C
10
2.35 V/cell (selectable from 2.30-2.40V/cell)
Constant current and constant voltage (IU) charge mode
Boost Voltage
V/cell (VRLA)
- float-boost current trigger 0.050 C (selectable 0.030-0.070)
10
- boost-float current trigger 0.010 C (selectable 0.005-0.025) with
10
Boost Control
24 hr safety timeout (selectable 8-30 hr)
- boost mode inhibit also selectable
1.63 V/cell (selectable from 1.60~1.75 V/cell
Auto Inverse EOD voltage x discharge current mode
(The end of discharge voltage increases at low discharge currents).
End Of
Discharge
V/cell (VRLA)
V/cell
2.4 V/cell (selectable from 2.3-2.4V/cell)
Constant current and constant voltage (IU) charge mode
Programmable auto trigger or inhibit of boost mode
Battery Charge
Battery
kW
A
2.5
5
5
7.5
12
*
Charging Power
max current
(adjustable) 1
3.75
7.5
7.5
* At low input voltage the UPS recharge capability increases with load decrease (up to the maximum capacity indicated)
1. Max currents listed are for EOD voltage of 1.67 V/cell for 240 cells.
Table 35 Inverter output to critical load
Unit of
Rated Power, kVA (kW)
Measurement
10 (8)
15 (12)
20 (16)
30 (24)
380/400/415 V (three-phase, four-wire with neutral
1
Rated AC Voltage
VAC
Hz
referenced to the bypass neutral)
2
Frequency
50 / 60
110% for 60 min
125% for 10 min
150% for 1 min
Overload
% Rated
>150% for 200 msec
Fault Current
% Rated
% Rated
% Rated
%
340% current limitation for 200 msec
3
Non linear load capability
Neutral current capability
Steady state voltage stability
100%
170%
±1 (balanced load), ±2 (100% unbalanced load),
± 5
4
Transient voltage response
%
Total Harmonic Voltage
Distortion (THDV)
3
%
< 1 (linear load), < 4 (non linear load )
Synchronisation - Window
Rated frequency ± 2Hz (selectable ± 0.5 to ± 3Hz)
1 Hz/sec
Slew Rate (Max change rate
of synch frequency)
Hz sec
selectable 0.1 to 3Hz/s (single UPS)
0.2Hz/sec (paralleled UPS)
Inverter Voltage Tolerance
%V (AC)
±5
1. Factory set to 400V – 380 or 415V selectable by commissioning engineer.
2. Factory set to 50Hz; 60 Hz selectable by commissioning engineer. Frequency converter operation also selectable.
3. EN 50091-3 (1.4.58) crest factor 3:1
4. IEC 62040-3 / EN 50091-3 also for 0-100-0% load transient. Transient recovery time: return to within 5% of steady state
output voltage within half a cycle.
75
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Technical Specifications
Table 36 Bypass mains input
Rated power, kVA
Unit of
Measurement
10
15
20
30
380/400/415 V
1
Rated AC Voltage
VAC
three-phase four-wire, sharing neutral with the rectifier input
and providing neutral reference to the output
Rated Current
380V
A
A
A
15
15
14
23
22
21
30
29
28
45
43
42
400V
415V
135% long term
170% 10 min
Overload Capacity
%
1000% 100 ms
Upstream Protection,
Bypass Line (by others)
Thermomagnetic circuit breaker, rated up to 125%
of nominal output current. IEC 60947-2 curve C.
N/A
Current Rating of Neutral Cable
A
1.7 x In
50 / 60
2
Frequency
Hz
Synchronous transfer: ≤1ms
Asynchronous transfer (default): 15 ms (50 Hz), 13.3 ms (60 Hz)
or 40, 60, 80, 100 ms, selectable
Transfer Time (between
bypass and inverter)
ms
Upper limit: +10, +15 or +20, default +15
Lower limit –10, -20, -30 or -40, default: -20
(delay time to accept steady bypass voltage: 10 sec)
Bypass Voltage Tolerance
% VAC
Bypass Frequency Tolerance
Synchronisation - Window
%
± 2.5 ± 5 ± 10 or ± 20 default ±10
Hz
Rated frequency ±2Hz (selectable ± 0.5 to ±3Hz)
1. Factory set to 400V – 380 or 415V selectable by commissioning engineer.
2. Factory set to 50Hz; 60 Hz selectable by commissioning engineer. Bypass condition ignored when UPS set as frequency converter.
76
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Technical Specifications
NOTES
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Technical Specifications
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Ensuring The High Availability
0f Mission-Critical Data And Applications.
Technical Support / Service
Web Site
Emerson Network Power, the global leader in enabling business-critical
continuity, ensures network resiliency and adaptability through
a family of technologies—including Liebert power and cooling
technologies—that protect and support business-critical systems.
Liebert solutions employ an adaptive architecture that responds
to changes in criticality, density and capacity. Enterprises benefit
from greater IT system availability, operational flexibility and
reduced capital equipment and operating costs.
Monitoring
800-222-5877
Outside the US: 614-841-6755
Single-Phase UPS
800-222-5877
Outside the US: 614-841-6755
Three-Phase UPS
800-543-2378
Environmental Systems
800-543-2778
Outside the United States
614-888-0246
Locations
United States
1050 Dearborn Drive
P.O. Box 29186
Columbus, OH 43229
Europe
Via Leonardo Da Vinci 8
Zona Industriale Tognana
35028 Piove Di Sacco (PD) Italy
+39 049 9719 111
Fax: +39 049 5841 257
Asia
7/F, Dah Sing Financial Centre
108 Gloucester Road, Wanchai
Hong Kong
While every precaution has been taken to ensure the accuracy
and completeness of this literature, Liebert Corporation assumes no
responsibility and disclaims all liability for damages resulting from use of
this information or for any errors or omissions.
© 2006 Liebert Corporation
All rights reserved throughout the world. Specifications subject to change
without notice.
852 2572220
Fax: 852 28029250
® Liebert and the Liebert logo are registered trademarks of Liebert
Corporation. All names referred to are trademarks
or registered trademarks of their respective owners.
SL-25410_REV2_08-06
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The global leader in enabling Business-Critical Continuity™.
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