Cabletron Systems Power Supply MPS14 User Manual

MPS14  
Rack Mount Power Supply  
USER GUIDE  
Publication AP3898  
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Important Safety Instructions  
WARNINGS - Read the following before proceeding :  
CAUTION  
ATTENTION: RISQUE DE CHOC ELECTRIQUE – NE PAS OUVRIR  
Read instructions:  
Retain these safety and operating instructions for future reference. Adhere to  
all warnings printed here and on the power unit. Follow the operating  
instructions printed in this User Guide.  
Do not remove covers: Operate the power unit with its covers correctly fitted. Refer any service work  
on the power unit to competent technical personnel only.  
Power sources:  
Connect the power unit to a mains power only of the type described in this  
User Guide and marked on the rear panel. Use only the power cord with  
sealed mains plug appropriate for your local mains supply as provided with  
the power unit. If the provided plug does not fit into your outlet consult your  
service agent for assistance.  
Power cord routing:  
Grounding:  
Route the power cord so that it is not likely to be walked on, stretched or  
pinched by items placed upon or against it.  
Do not defeat the grounding and polarisation means of the power cord plug.  
Do not remove or tamper with the ground connection in the power cord.  
WARNING: This equipment must be earthed.  
Water and moisture:  
To reduce the risk of fire or electric shock do not expose the power unit to rain  
or moisture or use it in damp or wet conditions. Do not place containers of  
liquids on it which might spill into any openings.  
Ventilation:  
Do not obstruct the ventilation slots or position the power unit where the air  
flow required for ventilation is impeded. If the power unit is to be operated in a  
flightcase ensure that it is constructed to allow adequate ventilation.  
Heat and vibration:  
Do not locate the power unit in a place subject to excessive heat or direct  
sunlight as this could be a fire hazard. Locate the power unit and its power  
unit away from any equipment which produces heat or causes excessive  
vibration.  
Servicing:  
Switch off the equipment and unplug the power cord immediately if it is  
exposed to moisture, spilled liquid, objects fallen into the openings, the power  
cord or plug become damaged, during lightening storms, or if smoke, odour or  
noise is noticed. Refer servicing to qualified technical personnel only.  
Installation:  
Install the power unit in accordance with the instructions printed in this User  
Guide. Do not connect the output of power unit to any other equipment other  
than that specified by Allen & Heath.  
MPS14 User Guide  
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Important Mains plug wiring instructions.  
The power unit is supplied with a moulded mains plug fitted to the AC mains  
power lead. Follow the instructions below if the mains plug has to be replaced.  
The wires in the mains lead are coloured in accordance with the following  
code:  
TERMINAL  
WIRE COLOUR  
USA/Canada  
European  
L
N
E
LIVE  
BROWN  
BLACK  
WHITE  
GREEN  
NEUTRAL  
EARTH GND  
BLUE  
GREEN & YELLOW  
The wire which is coloured Green and Yellow must be connected to the  
terminal in the plug which is marked with the letter E or with the Earth symbol.  
This appliance must be earthed.  
The wire which is coloured Blue must be connected to the terminal in the plug  
which is marked with the letter N.  
The wire which is coloured Brown must be connected to the terminal in the  
plug which is marked with the letter L.  
Ensure that these colour codes are followed carefully in the event of the plug  
being changed.  
Precautions  
Damage :  
To prevent damage to the power unit cosmetics, avoid placing heavy objects  
on the unit, scratching the surface with sharp objects, or subjecting the power  
unit to rough handling and vibration.  
Environment :  
Protect from excessive dirt, dust, heat and vibration when operating and  
storing. Avoid tobacco ash, smoke, drinks spillage, and exposure to rain and  
moisture. If the power unit becomes wet, switch off and remove power  
immediately. Allow to dry out thoroughly before using again.  
Cleaning :  
Avoid the use of chemicals, abrasives or solvents. The power unit is best  
cleaned with a soft brush and dry lint-free cloth. The use of electrical  
lubricants is not recommended.  
Transporting :  
The power unit should be transported in the original packing or purpose built  
flightcase to protect it from damage during transit.  
4
MPS14 User Guide  
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Introduction  
This user guide presents a quick reference to the MPS14. We recommend that you read this fully  
before starting. Included is information on installing, connecting and operating the power unit along  
with panel drawings and technical specification. For further information on the basic principles of  
audio system engineering, please refer to one of the specialist publications available from  
bookshops and audio equipment dealers.  
Whilst we believe the information in this guide to be reliable we do not assume responsibility for  
inaccuracies. We also reserve the right to make changes in the interest of further product  
development.  
We are able to offer further product support through our worldwide network of approved dealers  
and service agents. You can also access our Web site on the Internet for information on our  
product range, assistance with your technical queries or simply to chat about audio matters. To help  
us provide the most efficient service please keep a record of your power unit serial number, and  
date and place of purchase to be quoted in any communication regarding this product. The serial  
number is located on the rear panel.  
Check out our home site for information on the company and its pedigree, our full product range  
and our design philosophy.  
Contents  
Warranty..................................................... 2  
Using the MPS14........................................7  
Combining MPS14 power units ..................7  
Fan Filter cleaning ......................................8  
Replacing the mains fuse............................8  
Technical Specifications..............................9  
Internet Site ................................Rear Cover  
Important Safety Instructions ...................... 3  
Precautions................................................. 4  
Introduction & contents ............................... 5  
The MPS14................................................. 6  
Installation .................................................. 6  
MPS14 User Guide  
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The MPS14  
The slimline MPS14 power supply uses switch mode technology to generate the DC voltages required by the  
console. It will operate from a wide range of ac mains input voltages. Full protection and thermally controlled fan  
cooling ensures the power unit will operate consistently. The MPS14 also has a built in combiner for connection to  
a second supply for backup.  
ON  
PROTECT  
+ 17V  
-17V  
+ 12V  
+
48V  
ADVANCED TECHNOLOGY / HIGH POWER DELIVERY / AUTO COMBINING  
DO NOT OBSTRUCT VENTILATION OPENINGS.  
DO NOT OPEN. NO USER SERVICEABLE PARTS INSIDE.  
THIS APPARATUS MUST BE EARTHED BY THE POWER CORD.  
MPS14 CONSOLE POWER SUPPLY  
CAUTION  
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK  
DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.  
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR.  
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE FUSE  
WITH SAME TYPE AND RATING. DISCONNECT SUPPLY BEFORE CHANGING FUSE.  
ATTENTION: REMPLACER LE FUSIBLE AVEC UN DES MEMES CARACTERISTIQUES.  
COUPER L'ALIMENTATION AVANT DE CHANGER LE FUSIBLE.  
MAINS INPUT  
PIN  
PIN  
PIN  
PIN  
PIN  
PIN  
PIN  
1
2
3
4
5
6
7
=
=
=
=
=
=
=
+
+
12V @ 4A  
17V @ 6.5A  
FUSE  
A GND  
A GND  
D
+
T
GND  
48V @ 500mA  
T5A 250V  
-17V @ 6.5A  
100V - 230V.AC 47-63 Hz ~ 435WMAX  
S/No  
MADE IN ENGLAND  
Installation  
Free standing  
The MPS14 can be operated as a freestanding unit without requiring any special cooling arrangement, but should  
not be accidentally or deliberately covered in any way. Always stand the unit on a firm flat surface well away from  
any soft furnishings or carpet.  
Rack mounting  
The MPS14 is designed as a 19 inch rack mount unit and will occupy 2U (3.5 inches) of rack space. A pair of M4  
threaded holes on each side at the rear of the chassis are provided for fixing brackets for supporting the rear of  
the unit.  
An important consideration when rack-mounting the unit is the need for natural convection of airflow over the  
whole unit.  
Good ventilation below the unit, in the floor or back of the rack, will ensure a path for continuous airflow.  
Other equipment in the rack which is known not to produce a significant amount of heat should be mounted below  
the unit. Equipment which also relies on good airflow within the rack (i.e. most power amplifiers and other power  
supplies) should be given due consideration and some space should be provided between such units and  
between the MPS14 unit. Forced convection, by means of a fan-tray, may be desirable in this situation.  
Location  
As with any power supply that contains switch mode technology, it is preferable to provide a degree of physical  
isolation of the unit from other equipment, particularly that which carries low level audio signals, to avoid any  
possible interference pick-up. For this reason the unit is provided with a long (2.9m) output cable to enable it to be  
positioned away from the mixing console. For the same reason, when rack-mounting it is preferable to avoid  
locating the unit next to signal processing equipment.  
6
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Earthing  
Finally, some consideration should be given to the earthing arrangement of the system, at the centre of which is  
the console and the MPS14. The console chassis is earthed, to the mains earth, via the power supply. When  
rack-mounting the MPS14 care should be taken to avoid any possible “ground loops” in the system which may  
introduce audible hum or buzz to otherwise clean audio signals. Ground loops occur where signal processing  
equipment patched to the console, has its signal earth connected to the equipment chassis. A ground loop is  
formed if the chassis of the signal processing equipment and the MPS14 chassis are in electrical contact through  
the fixing rails they share in the rack. The MPS14 has audio 0V and mains earth connected internally. If a ground  
loop is formed operation of the “ground lift” switch on the rear panel of the MPS14 may reduce any unwanted hum  
or buzz.  
Using the MPS14  
The MPS14 will operate from an ac mains supply voltage from 100V to 240V. Before switching on the power  
supply, check that the ac mains fuse is of the correct type and rating. This is marked on the rear panel of the  
power unit. The power supply is provided with an IEC type mains connector and a moulded mains plug. Check  
that this is suitable for connection to the wall socket outlet.  
Always switch the power supply off before connecting or disconnecting the console power cables, removing or  
installing console modules and any servicing work. In the event of an electrical storm, or large mains voltage  
fluctuations, immediately switch off the power supply and disconnect from the mains supply.  
During normal operation some heat is generated. This is expelled via the front panel ventilation holes.  
Combining MPS14 Power units  
Each MPS14 power unit has a built in combiner allowing the direct connection of other MPS14 power units for  
backup. Connect the two power units together using the MPS14 “linking” cable (A&H Part No: 002-584) by  
plugging into the DC output sockets of each power unit.  
To console  
MPS14  
COMBINING MPS14 POWER UNITS  
“linking” cable  
BACKUP  
MPS14  
Note; the “linking” cable can be connected to either of the two MPS14 DC output connectors on both units.  
MPS14 User Guide  
7
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Cleaning and Replacing the fan filters.  
At regular intervals, it is recommended that the two foam fan filters are cleaned or replaced to ensure efficient  
operation of the power unit. Failure to do so may reduce the efficiency or even damage the power unit.  
Use a vacuum cleaner to remove dust from the air intakes on the rear of the power unit  
If the filters need replacing contact your nearest service agent or Allen & Heath dealer.  
Fan filter part No:  
AK4070  
Replacing the mains fuse  
The AC mains fuse is located on the rear of the MPS14 unit next to the AC mains connector. In the event of a  
mains surge or under-rated fuse value, the mains input fuse will rupture. Switch off the power supply and remove  
the mains lead plug from the “MAINS INPUT” socket on the rear of the unit.  
Check the fuse and replace if necessary.  
TO AVOID THE RISK OF FIRE REPLACE FUSE WITH THE CORRECT TYPE  
ONLY, AS INDICATED ON THE UNIT  
AC~ mains input voltage  
100V – 230V ± 10%  
Fuse type  
T 5A 250V 20mm  
In the event of repeated failure of the mains fuse, consult the local dealer from where the unit was purchased.  
8
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Technical specification  
Mains Input Voltage Range  
100 - 240 ± 10% VAC @ 47-63 Hz  
Power consumption (max.)  
435W  
Mains Fuse:  
100 - 240 V~  
T 5.0A/250V  
Internal Fuses:  
PCB Ident  
F1 (+12V)  
F2 (+48V)  
Fuse type  
T 6.3A 250V 20mm  
T 1.6A 250V 20mm  
T 500mA 250V 20mm  
F18 (aux psu)  
DC Outputs  
DC Voltage Rail  
+17 VOLTS  
-17 VOLTS  
Output Current  
6.5A Max.  
6.5A Max.  
+12 VOLTS  
+48 VOLTS  
4A Max.  
500mA Max.  
DC Output Socket Pin Connections  
Pin No:  
Connection  
+12 Volts  
+17 Volts  
Chassis  
A GND  
D GND  
1
2
3
4
5
6
7
+48 Volts  
-17 Volts  
Overall Dimensions  
Front Panel:  
482mm x 88mm  
440mm  
90mm  
260mm  
6Kg  
19 inch 2U  
17.30 inches  
3.5 inches  
10.25 inches  
13 pounds  
Width (excluding rack ears):  
Height including feet:  
Depth:  
Weight:  
Cable Assemblies  
Assembly  
DC cable  
Description  
A&H Part no:  
002-583  
2.9m MPS14 to ML5000 console cable assembly  
DC LINK cable  
0.75m MPS14 to MPS14 PSU “LINKING” cable assembly 002-584  
MPS14 User Guide  
9
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10  
MPS14 User Guide  
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