Cooper Lighting Switch S260 75 1 User Manual

Oil- and Vacuum-Break

Switches

Service Information

Type S Automatic Load-Transfer Control

_{Installation, Operation, and Maintenance Instructions}S260-75-1

Grounding the Control . . . . . . . . . . . . . . . . . . . . .6

Before Placing the Control and Switchgear

in Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Equipment Required . . . . . . . . . . . . . . . . . . . . . . .6

Customer Connections . . . . . . . . . . . . . . . . . . . . .8

Interconnecting Cables . . . . . . . . . . . . . . . . . . . . .13

Operating Instructions . . . . . . . . . . . . . . . . . . . . .16

Initial Operation . . . . . . . . . . . . . . . . . . . . . . . . . .16

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . .17

Theory of Operation—Basic S Control . . . . . . . . .17

Voltage Sensing . . . . . . . . . . . . . . . . . . . . . . . . . .17

Automatic Transfer, Preferred to Alternate . . . . . .18

Return Transfer, Parallel Transition . . . . . . . . . . . .18

Return Transfer, Non-Parallel Transition . . . . . . . .18

No Preference Mode . . . . . . . . . . . . . . . . . . . . . .19

Preferred Source II Mode . . . . . . . . . . . . . . . . . . .19

Control Mode Switch, S5 . . . . . . . . . . . . . . . . . . .19

Manual Control . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Indicating Lamps . . . . . . . . . . . . . . . . . . . . . . . . .19

Remove the Control from Service . . . . . . . . . . . . .20

Troubleshooting—Basic S Control . . . . . . . . . . . .20

020076KM

Figure 1.

Kyle^®Type S automatic load-transfer control.

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Basic Troubleshooting . . . . . . . . . . . . . . . . . . . . .20

Advanced Troubleshooting . . . . . . . . . . . . . . . . . .21

Fault Block Accessory . . . . . . . . . . . . . . . . . . . . .28

General Description . . . . . . . . . . . . . . . . . . . . . . .28

Accessory Settings . . . . . . . . . . . . . . . . . . . . . . . .28

Operating Instructions . . . . . . . . . . . . . . . . . . . . .29

Theory of Operation—Fault Block Accessory . . . .29

Overcurrent Sensing . . . . . . . . . . . . . . . . . . . . . .29

Phase Fault Operation . . . . . . . . . . . . . . . . . . . . .29

Ground Fault Operation . . . . . . . . . . . . . . . . . . . .32

Reset Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Inrush Restraint Feature . . . . . . . . . . . . . . . . . . . .32

Testing Fault Block Operation . . . . . . . . . . . . . . . .33

Returning the Control to Service . . . . . . . . . . . . . .35

Wiring Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . .40

Front Panel—Replacement Parts List . . . . . . . . . .41

Back Panel—Replacement Parts List . . . . . . . . . .42

Fault Block Accessory—Replacement Parts List . .43

Contents

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . .2

Hazard Statement Definitions . . . . . . . . . . . . . . . .2

Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . .2

Product Information . . . . . . . . . . . . . . . . . . . . . . .3

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Acceptance and Initial Inspection . . . . . . . . . . . . .3

Handling and Storage . . . . . . . . . . . . . . . . . . . . . .3

ANSI Standards . . . . . . . . . . . . . . . . . . . . . . . . . .3

Quality Standards . . . . . . . . . . . . . . . . . . . . . . . . .3

Description of Operation . . . . . . . . . . . . . . . . . . . .4

Time Delay Selection . . . . . . . . . . . . . . . . . . . . . .4

Pre-Installation Check . . . . . . . . . . . . . . . . . . . . . .5

Pre-lnstallation . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Installation Instructions . . . . . . . . . . . . . . . . . . . .6

Initial Programming . . . . . . . . . . . . . . . . . . . . . . .6

Mounting the Control . . . . . . . . . . . . . . . . . . . . . .6

October 2002 • Supersedes 1/90

Printed in USA

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SAFETY

FOR LIFE

S260-75-1

PRODUCT INFORMATION

Introduction

Handling and Storage

Service Information S260-75-1 provides installation,

operation, and maintenance instructions for the Kyle^®

Type S automatic load-transfer control.

Use care during handling and storage of the control. If

the control is to be stored for any length of time prior to

installation, provide a clean, dry storage area to mini-

mize the possibility of mechanical damage.

Read This Manual First

Read and understand the contents of this manual and

follow all locally approved procedures and safety prac-

tices before installing or operating this equipment.

ANSI Standards

Kyle reclosers are designed and tested in accordance

with ANSI standards C37.60 and C37.85 and ANSI

guideline C37.61.

Additional Information

These instructions cannot cover all details or variations in

the equipment, procedures, or process described, nor to

provide directions for meeting every possible contin-

gency during installation, operation, or maintenance. For

additional information, contact your Cooper Power

Systems representative.

Quality Standards

The Quality System at the Cooper Power Systems, Kyle

Distribution Switchgear plant is ISO 9001 certified.

ISO 9001

CAN/CSA ISO 9001

BS EN ISO 9001

ANSI/ASQC Q9001

Acceptance and Initial

Inspection

Each Type S control is completely assembled, tested,

and inspected at the factory. It is carefully calibrated,

adjusted, and in good condition when accepted by the

carrier for shipment.

Upon receipt, inspect the carton for signs of damage.

Unpack the control and inspect it thoroughly for damage

incurred during shipment. If damage is discovered, file a

claim with the carrier immediately.

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

Description of Operation

IMPORTANT: If Control Mode Switch S3 is placed in

the “AUTO” position, the S-control will place the high-

voltage transfer switches into the configuration that is

currently selected by the Source Preference Switch

S4. This may result in an unintended transfer. Make

sure the desired state of the high-voltage transfer

switches match the setting of S4 before returning S3 to

the “AUTO” position.

The Type S control is designed for use primarily with Kyle

Type VR, VLR, VRV, TSC, and C three-phase, load-break

switches in automatic load-transfer schemes. In a typical

scheme, service to a critical load is normally supplied from

a preferred source. It is automatically switched to an alter-

nate, standby source if the preferred source voltage is lost

for any reason for a preset period of time. Upon restora-

tion of the preferred source voltage, the load is automati-

cally switched back to the preferred source, again after a

predetermined time delay.

• Manual Operation of the S control. The Source I and

Source II high-voltage switches can be opened and

closed independently to effect manual transfer from

one source to the other. (Accomplished by setting

OPERATION SELECTOR switch, S3, to MANUAL and

operating MANUAL OPER. SOURCE I (S1) and MAN-

UAL OPER. SOURCE II (S2) switches as required.)

Typical Automatic Load-transfer

Sequence using the Type S Control

• The load is transferred to the alternate source after a

preset time delay, when the preferred source voltage

is lost and normal voltage is present on the alternate

source. Either Source I or Source II can be selected

as the preferred source by a setting on the SOURCE

PREFERENCE Switch, S4.

In addition, a factory-installed fault block accessory will

Block Transfer if loss of voltage is due to a fault on the

load side of the high-voltage switches. When preferred

source voltage is lost (due to the opening of the backup

protective device)—and after the preset time delay—the

preferred source switch will open and the fault block

accessory will disable the S control to prevent closing

either high-voltage switch into the fault. The S control

must be manually reset before service to the load can be

restored. The fault block option is a factory-installed

accessory. The accessory is activated by over-current

signals supplied by load-sensing current transformers

built into special factory-modified Type VR, VLR, VRV,

TSC, and CS high-voltage switches. It is also compatible

with the PST-6 switchgear. The PST-9 switchgear does

not require fault block.

• The load is transferred back to the preferred source—

after another preset time delay—when normal volt-

age is restored to the preferred source. The return

transfer (from Source II to Source I) can be either

non-parallel (alternate-source switch opens before

preferred-source switch closes) or parallel (preferred-

source switch closes before alternate-source switch

opens). With parallel return the second interruption is

eliminated; however, both sources must be in syn-

chronism. The return transfer mode is selected by a

setting on the SOURCE PREFERENCE switch, S4.

Variations in the Operation

of the Type S Control

Time Delay Selection

The time delay setting for preferred to alternate source

transfer must be long enough to allow discrimination

between permanent loss of voltage and temporary loss of

voltage due to transient effects or reclosing intervals of

backup protective reclosers or breakers. The time-delay

required to override reclosing intervals is difficult to deter-

mine since voltage may be subnormal during the retard-

ed timing operations of the backup device due to the

presence of the fault. It is recommended that the time

delay before transfer from preferred to alternate source is

set to exceed the maximum cumulative time to lockout of

the backup protective device. This approach assures that

the transfer switch will not interrupt the current of a fault

occurring on the load side of the switch.

• No-Preference Operation. When either source is

acceptable for continuous critical load supply. Upon

loss of Source I voltage—and after a preset time

delay—the load is automatically transferred to Source

II, provided normal voltage is present on Source II.

However, the load is not transferred back to Source I

when voltage is restored, but remains on Source II

until such time as Source II voltage is lost. Then an

automatic nonparallel transfer to Source I is per-

formed. (Accomplished by setting SOURCE PREF-

ERENCE switch, S4, to NO PREF position.)

• Hold on Alternate Source. When placed to the

HOLD ON ALTERNATE position, the S control will not

automatically return to the preferred feeder. If the pre-

ferred feeder is energized, the S control can be man-

ually transferred to the preferred feeder by momen-

tarily moving S3 to the NORMAL position.

The time delay for return from alternate to preferred source

upon restoration of preferred source voltage should be set

for an interval long enough to assure that service on the

preferred source has been permanently restored.

When the control is programmed to operate in the “no-

preference” mode, there are no preferred or alternate

sources. Time delay intervals for transfer from Source I to

Source II are governed by the left-hand Preferred to

Alternate timer and for transfer from Source II to Source

I by the right-hand Alternate to Preferred Timer. Settings

of the two timers may be different because of difference

in backup protection on the two sources.

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SAFETY

FOR LIFE

S260-75-1

PRE-INSTALLATION CHECK

between terminal 15 of TB1 and ground. Similarly,

when MANUAL OPER. SOURCE II switch (S2) is in

the CLOSE position there should be 120 Vac

between terminal 25 of TB1 and ground.

Pre-Installation

WARNING: This equipment is not intended to

protect human life. Follow all locally approved pro-

cedures and safety practices when installing or operat-

ing this equipment. Failure to comply can result in

death, several personal injury and equipment damage.

G102.1

5. To check the response of the latching relay to auto-

matic operation, proceed as follows:

A. Set OPERATION SELECTOR switch (S3) to AUTO.

B. Select the desired source preference and return

mode with switch S4.

WARNING: Hazardous voltage. Never rely on

C. After waiting for a time in excess of the maximum

transfer delay timer setting (to make sure the con-

trol is at rest), simulate a “lost” phase by unscrew-

ing one of the preferred source fuses. Listen for

relay clatter to recognize breaking the circuit.

the open position of the operating handle or the

contact position indicator; it does not ensure that the

line is deenergized. Follow all locally approved safety

practices. Failure to comply can result in contact with

high voltage, which will cause death or severe person-

al injury.

G123.1

D. As soon as phase voltage is lost, the PREFERRED

TO ALTERNATE TIMER will start to run. Verify the

LED timer is illuminated during operation.

The Type S automatic load-transfer control is pro-

grammed to customer’s specifications and thoroughly

tested before shipment from the factory. Perform the fol-

lowing pre-installation test setup and procedure to verify

the operation of the standard S control.

E. When timing is complete, the latching relay (R1)

will operate. Its position can be checked by the

presence of 120 Vac at test terminals T-1 or T-2 on

the front panel. 120 Vac between T-2 and T-3

(ground) means the latching relay has moved to

that position which would connect the load to

Source II if HV switches were connected to the

control. 120 Vac at T-1 means the load would be

connected to Source I.

Note: This procedure does not test complete control opera-

tion. This can be done only on a complete installation

basis with the S control operating the high-voltage

transfer switches.

Test Set–up

1. Connect a 120 Vac, 60 Hz power supply to terminals Z

and G2 of TB2 being absolutely certain that the

grounded side of the power supply is connected to G2.

F. Replace the removed fuse to restore preferred

source power, observe operation of the ALTER-

NATE TO PREFERRED TIMER, and check the

status of the latching relay (R1) when timing is

completed.

2. Jumper terminal Z to Y to X to C to B to A.

Note: SOURCE PREFERENCE switch S4 cannot be

3. When the 120 Vac power supply is turned on, all six

in NO PREF position for this test.

phases are energized.

G. Other modes of transfer can be checked by pro-

gramming the control for the desired sequence,

simulating loss of source voltage, observing resul-

tant control operation, and checking the final posi-

tion of the latching relay (R1).

4. To simulate loss of voltage on any phase of either

source, simply unscrew the appropriate fuse “FU” in

the control.

Test Procedure

6. Timer settings can be verified with a watch while per-

1. Check the indicating lamps by depressing the LAMP

TEST switch (S6). All lamps on the front panel of the

control (including fault block accessory if installed)

should light with equal brilliance.

forming the checks in preceding Step 5.

7. Switch I and Switch II position indicating lamps will

not operate during this preinstallation check since the

high-voltage transfer switches are not connected to

the control.

2. With phase Y and/or phase B energized, terminals 11

and 21 of TB1 will always show 120 Vac to ground

(G or G ).

Their operation can be verified by connecting a 100

ohm, 1 watt, resistor from TB1 terminals to ground

as follows:

3. With OPERATIONS SELECTOR switch (S3) set to

MANUAL, terminal 13 of TB1 will respond to the

operation of MANUAL OPER. SOURCE I switch (S1)

showing 120 Vac to ground when S1 is in the open

position and 10 Vac, or less, when S1 is in the OFF

and CLOSE positions. Terminal 23 of TB1 will show

similar voltages to ground in response to the opera-

tion of MANUAL OPER.

SWITCH I OPEN lamp—terminal 15 to ground

SWITCH I CLOSED lamp—terminal 24 to ground

SWITCH II OPEN lamp—terminal 25 to ground

SWITCH II CLOSED lamp—terminal 14 to ground

4. When MANUAL OPER. SOURCE I switch (S1) is in

the CLOSE position there should be 120 Vac

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

INSTALLATION INSTRUCTIONS

A typical automatic transfer scheme is illustrated in Figure 2.

Before Placing the Control and

Switchgear into Service

Initial Programming

CAUTION: Equipment misoperation. Do not

The control must be programmed with all necessary

operating settings prior to operation with energized

switchgear. For the desired settings refer to the

Operating Instructions section in this manual.

energize this equipment until all control settings

have been properly programmed and verified. Refer to

the Control Programming and Operation section of this

manual for programming procedures. Failure to com-

ply can result in misoperation (unintended operation),

Mounting the Control

equipment damage, and personal injury.

G118.1

Mount the S control in a convenient, accessible location.

Maximum distances between the high-voltage transfer

switches and potential sensing transformers and the con-

trol depends upon the size of the control cable wire and

the length of various cable combinations. (See the

Interconnecting Cables section in this manual.) Keep in

mind that the longer the cable lengths, the greater the

susceptibility to surge damage. Therefore, for optimum

reliability and economy, locate the switches and trans-

formers as near as possible to the control.

Prior to placing the control and switchgear into service,

the following installation procedures must be properly

completed and verified:

1. Control properly mounted for the installation.

2. Equipment installed according to all locally approved

standards and practices.

3. Control and switchgear properly grounded in accor-

dance with guidelines in this manual.

Mounting dimensions are provided in Figure 3.

4. AC power connected to the control.

• For pole-mounted installation, a hole and keyway in

the control mounting bracket accommodates a 5/8”

bolt.

5. All control programming entered and verified by

appropriate personnel.

• For substation installation, the control is factory

installed. Leveling is not required.

Equipment Required

The following equipment is required for a load-transfer

installation:

Grounding the Control

Type S Load-Transfer Control

WARNING: Hazardous voltage. Solidly ground

all equipment. Failure to comply can result in

The control, with or without the fault block accessory, is

housed in a cabinet whose outline and mounting dimen-

sions are shown in Figure 3. The control cabinet can be

mounted on a pole or substation structure. Leveling is not

required. Both the cabinet door and the hinged front

panel are equipped with hold-open latches to prevent

them from swinging in the open position.

death, severe personal injury, and equipment damage.

T223.2

The control cabinet must be grounded. A grounding con-

nector on the underside of the cabinet will accommodate

No. 14 solid through No. 4 stranded conductors.

For efffective surge protection all control and power con-

ductors for the S control must be routed parallel to a cor-

responding ground path. For example, the AC power

supply for the control should be parallel to and equal in

length to the transformer ground path. The control cable

should be parallel to and routed close to the switchgear

ground path.

Motor Operated Switches

The three-phase, load break switches require a special

wiring accessory for operation with the Type S control. In

addition, if fault block is provided, the switches must be

equipped with 1000:1 ratio current transformers also

available as a factory-installed switch accessory. See the

switch installation manual for overall and mounting

dimensions and for wiring diagrams.

Potential Transformers

Three-phase voltage sensing is required for control oper-

ation. Transformer connections and voltages for various

distribution system connections are shown in Figure 5.

The voltage sensing relays of the Type S control drop out

on a decreasing voltage at 75 volts (min) and pick up on

an increasing voltage at 97 volts (max). The control

requires 120 Vac, 60 Hz, 500 VA (min) to operate the

transformer switches. Quiescent power dissipation at

120 Vac is 18 watts.

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SAFETY

FOR LIFE

S260-75-1

LOAD

SOURCE II

H.V.

SWITCH

SOURCE I

H.V.

SWITCH

POTENTIAL

SENSING

TRANSFORMERS

POTENTIAL

SENSING

TRANSFORMERS

TYPE

CONTROL

Figure 2.

Typical Type S control load-transfer scheme.

MTG HOLES (2) FOR

5/8" MAX BOLT DIA

16"

12 13/16"

1 1/2"

20 1/8"

MTG DIM

17 7/8"

22 5/32"

5/8" HOLE PROVIDED

FOR CUSTOMER LOCK

GROUNDING

TERMINAL LUG

(14 TO 4 STRANDED)

11"

1 3/16"

13 1/2"

2 1/2" 2 1/2"

1 5/8" DIA HOLES

5 1/4"

STD CONTROL

CONTROL WITH FAULT BLOCK

Figure 3.

Outline and mounting dimensions.

TABLE 1

Reaction and Transition Times of Cooper Power Systems Motor-Operated Switches

Direction of

Transfer

(Source to

Source)

First Switch

Reaction Time*

Transition

Time**

Switch

Type of Transition

No paralleling of sources

VR, VLR, VRV (standard)

2.5 to 3.5 cycles 10 sec (approx)

10 sec (approx) 1.0 to 1.5 cycles

I to II

II to I

No paralleling of sources

Paralleling of sources on return to preferred source

VR, VLR, VRV (quick close) 2.5 to 3.5 cycles 6 to 7 cycles

VR, VLR, VRV (quick close) 4.0 to 5.5 cycles 1.0 to 1.5 cycles

I to II

II to I

No paralleling of sources

Paralleling of sources on return to preferred source

TSC

7 to 8 sec

I to II

II to I

No paralleling of sources

Paralleling of sources on return to preferred source

PST-6, PST-9

2.0 to 3.0 cycles 5.0 to 6.0 cycles

5.0 to 6.0 cycles 2.0 to 3.0 cycles

I to II

II to I

No paralleling of sources

Paralleling of sources on return to preferred source

Time from expiration of time delay to first opening (or closing) of high-voltage switch. Add approximately one cycle to the

values shown to allow for Type S control relay operating time.

** Time-load tap is disconnected or paralleled depending on type of transition used.

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

LOAD

H.V.

SWITCH

SOURCE

FEEDER

CONT

Phase Voltage at the Three-Phase Sensing Type S Load Transfer Control as Related to System and Sensing Transformer Connections

Assuming no feedback from the load

** Bank operates open wye-delta; requires two primary phases open for sensing

† Voltage may vary from 87 to 58% depending on load

Figure 4.

Phase voltage at the three-phase sensing Type S load-transfer control.

the internal wiring between the terminal blocks and the

Customer Connections

Connection Diagram

input and output receptacles on the control (available as

an accessory) and the external wiring between the con-

trol, transfer switches, and potential transformers. If the

control is not equipped with the plugs and receptacles

accessory, the cables are wired directly to the terminal

blocks in the control. For the physical location of terminal

blocks, refer to Figure 27.

CAUTION: Equipment Damage. Do not drill connec-

tion holes into the top of the cabinet. Connection holes in

the top of the cabinet will allow moisture to seep into the

control and damage the components or cause control

misoperation. Failure to comply will void the control’s fac-

Note: Internally wired receptacles and mating plugs for the

switch operators and current sensing transformers on

the switch end of the cables are provided as standard

with the switches.

tory warranty.

T249.0

Diagrams for interconnecting the load-transfer control

with the high-voltage switches and potential transformers

are shown in Figures 5 through 8. The diagrams show

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SAFETY

FOR LIFE

S260-75-1

Figure 5.

Connection diagram for Type S load-transfer control (with fault block accessory) operating a Type VR, VLR, or

VRV three-phase switch. (The transformer cutouts, tap fuses, reclosers, and arresters are not shown.)

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

O P E N

C L O S E

O P E N

C L O S E

Figure 6.

Connection diagram for Type S load-transfer control (with fault block accessory) operating the Type TSC

three-phase switch. (The transformer cutouts, tap fuses, reclosers, and arresters are not shown.)

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SAFETY

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S260-75-1

Figure 7.

Connection diagram for Type S load-transfer control operating the Type PST-6 switch. (The transformer cutouts,

tap fuses, reclosers, and arresters are not shown.)

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

Figure 8.

Connection diagram for Type S load-transfer control operating the Type PST-9 switch. (The transformer cutouts,

tap fuses, reclosers, and arresters are not shown.)

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S260-75-1

Interconnecting Cables

Interconnecting cable conductor size is dependent upon

the distance between the control, switches, and potential

transformers. Maximum lengths of various cable combi-

nations for No. 18 through No. 12 AWG conductors are

shown in Table 2. The longest combination for the partic-

ular installation will determine the minimum conductor

size. All cables are to be the same conductor size.

Note: If the control is equipped with the fault block accesso-

ry, see Table 3 for additional cable length limitations.

On the switch end, the cables are wired to connector

plugs provided as standard with the switches. On the S

control end, the cables are wired either directly to termi-

nal blocks in the control or to connector plugs provided

with the Plugs and Receptacles accessory. Figure 9

shows the location of the accessory plugs and recepta-

cles in the bottom of the control cabinet. See the appro-

priate switch installation manual for the location of the

plugs and receptacles on the switch.

020079KM

Figure 9.

Plugs and receptacles accessory.

Switch Cable

KEYWAY

A conductor cable is required between the S control and

each high-voltage switch to operate the switches. This

cable is wired to a socket plug at the switch end and to

either a plug or TB1 at the control end. Pin identification,

and cable OD and maximum conductor size accommo-

dated by the plugs are shown in Figures 10 and 11.

PIN INSERT CONNECTIONS INTO CONTROL

PIN F

VIEW A-A

RUBBER GROMMET

ACCOMMODATES

1/2" TO 5/8" DIA. CABLE

Potential Transformer Cable

MAX. WIRE SIZE – NO.16 AWG

A four-conductor cable is required between the S control

and the potential transformers to transmit source voltage

intelligence and to supply operating power for the control.

This cable is wired to a five-pin socket plug or TB2 at the

control end. Pin socket identification, cable OD, and

maximum conductor size accommodated by the plugs

are shown in Figure 12.

Figure 10.

Switch cable plug for VR, VLR, VRV, and TSC.

PST-6 8, 7, & 19 PIN RECEPTACLES

PST-9 8 & 19 PIN RECEPTACLES

Note: Connectors are not supplied for the transformer end of

KEYWAY

PIN INSERT CONNECTIONS INTO CONTROL

PIN F

the cable.

TABLE 2

Maximum Control Cable Lengths

LOAD

8 PIN

7 PIN

19 PIN

VIEW A-A

Figure 11.

Switch cable plugs for PST-6 and PST-9.

S CONTROL

KEYWAY

SOCKET E

SOCKET INSERT – CONNECTS INTO CONTROL

Maximum Length of

Control Cable Combinations (ft.)

Cable Wire

Size

(AWG)

VR, VLR, or VRV Switches TSC Switch

A+B+D or C+B+D

A+B or A+D

or C+B or C+D

1450

2300

3700

5900

1250

2000

3200

5050

RUBBER GROMMET

ACCOMMODATES

3/8" TO 1/2" DIA. CABLE

MAX. WIRE SIZE – NO.12 AWG

Note: The control cable lengths are not applicable for the C

Figure 12.

PT cable plug.

switch and the PST switch.

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

Fault Block Shielded Cable

Table 3 shows the maximum distance between the con-

TABLE 3

Fault Block Cable Limitations

trol and the high-voltage switches for a range of conduc-

tor sizes and fault-block settings. The table is based on

conductor voltage drop and saturation of the current

sensing transformers in the switch. Lower actuating lev-

els and lower multipliers could allow longer lines.

However, the limitation on switch control cable lengths,

Table 2, preclude their use.

Max. Distance in Feet

Between Switch and

S Control

Phase

Actuating

Current

Level

Con-

ductor

Size

For X 8

Multi-

plier

For X 6

Multi-

plier

For X 4

Multi-

plier

(Amps)

(AWG)

640

600

950

1500

2400

1000

1600

2550

4000

1800

2900

4600

7300

Shielded cable is required between the transfer switches

and the S control for operating the fault block accessory.

448

320

1100

1800

2800

4500

1800

2900

4600

7300

1700

2700

4300

6850

–

IMPORTANT: Only shielded cable is to be used on fault

block accessory and is mandatory to validate the

Cooper Power Systems warranty. Use of a non-shielded

cable could result in misoperation.

The shield must be grounded to the equipment housing

at both the switch and control ends. Shield connections

are made at connector plug pin or socket as shown in

Figure 13. This pin mates with the receptacle pin or sock-

et which is grounded in the switch and in the control as

shown in Figures 6 and 8.

SOLDER #16 AWG JUMPER WIRE

FROM SHIELD TO PIN G TO

COMPLETE SHIELD CONNECTION

RUBBER GROMMET

ACCOMMODATES

KEYWAY

.50 TO .56 DIA. CABLE

PIN G

SOCKET A

CONTROL END

SWITCH END

STRIP JACKET TO EXPOSE SHIELDING

Figure 13.

Fault block cable plug.

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SAFETY

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S260-75-1

020076KM

Figure 14.

Type S control front panel.

TABLE 4

Description and Use of Operating Controls and Indicators

Index No.

Figure 2

Description

Purpose and Use

SOURCE PREFERENCE AND RETURN MODE

Switch (S4) (See Note A)

Selects either Source I (PREF I) or Source II (PREF II) as the

preferred source, or no preference (NO PREF). Also selected

parallel (P) or non-parallel (NP) return mode.

SOURCE I ENERGIZED lamp

OPERATION SELECTOR Switch (S3)

PREFERRED TO ALTERNATE TIMER

Indicates all three phases of Source I are energized.

Programs control for either AUTOmatic or MANUAL operation.

Determines time delay before transfer to alternate source when

preferred source voltage is lost.

SWITCH I OPEN and CLOSED lamps

LAMP TEST switch (S6)

LATCH RELAY STATUS TEST terminals

(T1—T2—T3)

Indicates status of Source I high voltage switch.

Tests all indicating lamps on front panel.

Provides electrical access to both sides of latch relay to

determine if control is in Source I or Source II mode.

SWITCH II OPEN and CLOSED lamps

ALTERNATE TO PREFERRED TIMER

Indicates status of Source II high voltage switch.

Determines the time delay before transfer to preferred source

when preferred source voltage is restored.

MANUAL OPER. SOURCE I and MANUAL OPER. Provides means to OPEN and CLOSE Source I and Source II

SOURCE II switches (S1 and S2)

transfer switch upon manual command, when S3 is in MANUAL

position.

SOURCE II ENERGIZED lamp

CONTROL MODE switch (S5)

Indicates all three phases of Source II are energized.

Blocks automatic return transfer to preferred sources (HOLD ON

ALTERNATE); also enables control to be operated without

operating the high voltage transfer switches (TEST).

FAULT-BLOCK OPERATED lamp

RESET switch (S7)

Indicates fault-block has operated (part of fault-block accessory).

Resets the control after a fault block operation (part of fault-block

accessory). S3 must be in MANUAL position.

Fuses

Voltage input of all three phases of both Source I and Source II

are fused for 10A-125 vac; white button shows on front of fuse if

fuse blows.

Note A — Tab provided to lock switch knob in set position; stop screw prevents inadvertent selection of parallel return transfer mode.

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

OPERATING INSTRUCTIONS

1. The switches on the front panel should be positioned

DANGER: Hazardous voltage. Contact with haz-

as follows:

ardous voltage will cause death or severe person-

A. S1 (MANUAL OPER. SOURCEI) — OFF

B. S2 (MANUAL OPER. SOURCE II) — OFF

C. S3 (OPERATlON SELECTOR) — MANUAL

al injury. Follow all locally approved safety procedures

when working around high and low voltage lines and

equipment.

G103.3

D. S4 (SOURCE PREFERENCE AND RETURN

MODE) — set to the desired mode of operation.

WARNING: Hazardous voltage. Never rely on

the open position of the operating handle or the

E. S5 (CONTROL MODE) — NORMAL

contact position indicator; it does not ensure that the

line is deenergized. Follow all locally approved safety

practices. Failure to comply can result in contact with

high voltage, which wil cause death or severe person-

2. Set the PREFERRED TO ALTERNATE TIMER and

ALTERNATE TO PREFERRED TIMER as required.

(See Time Delay section in this manual.)

al injury.

G123.1

3. Check that all installation connections are complete

as shown in the appropriate connection diagram

Figures 5 through 8.

Before energizing the installation, an understanding of

the functions of the operating controls and indicating

lights is essential. (See Table 4 and Figure 14).

4. Make sure both high-voltage transfer switches are open.

5. With all six fuses in place, energize both power

Initial Operation

sources to the control.

To place the automatic transfer scheme into service, pro-

ceed as follows:

A. SOURCE I ENERGIZED lamp should be on.

B. SOURCE II ENERGIZED lamp should be on.

C. SWITCH I OPEN lamp should be on.

CAUTION: Equipment misoperation. Source I and

Source II high voltage switches can be paralleled in the

manual operation mode even if SOURCE PREFER-

ENCE switch, S4, is set for NP (non-parallel opera-

tion). Make sure both sources are in synchronism if a

manual parallel operation is to be performed. Failure to

comply can result in misoperation (unintended opera-

D. SWITCH II OPEN lamp should be on.

6. Depending upon which source is the preferred

source, momentarily operate either S1 or S2 to the

CLOSE position. The appropriate switch will close to

energize the load and its status indicating lights will

transfer from OPEN to CLOSED.

tion) and equipment damage.

T304.0

7. Place the OPERATION SELECTOR SWITCH (S3) to

AUTO. The S control is in service. No further opera-

tion will occur until the preferred source voltage is lost.

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SAFETY

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S260-75-1

Out Indicator

Timer Settings

The out indicator briefly lights to signal completion of a

timing interval and confirm that the timer has operated.

IMPORTANT: Put control in manual mode prior to

changing timer setting. There is no fault current pro-

tection when in manual mode. Failure to comply can

cause unintended operation.

Normal Operation

The control will react to ongoing line voltage conditions

and operate automatically as programmed. If equipped

with the fault block accessory, transfer to the alternate

source may be prevented when loss of voltage is due to

The two digital timers are identical. One timer controls the

time required to transfer from the preferred source to the

alternate source, the other timer controls the time to trans-

fer from the alternate source to the preferred source.

load-side fault. See Fault Block Operating

Instructions section for procedure to restore service.

OUT Indicator

THEORY OF OPERATION

—BASIC S CONTROL

OUT

Digital Time

Thumb-Wheel

Time Setting

3.45

3 49

Refer to Figures 16 and 17 for the following sections:

Display

Voltage Sensing

The S control will transfer the load to an alternate source

when one or more phases of the preferred source is lost,

provided normal voltage is present on all three phases of

the alternate source. To perform this function, the control

requires three-phase, low-voltage (120 Vac) input from

both the preferred and alternate sources of power. Input

from Source I is connected to terminals A, B, C and G1

of TB2, and input from Source II is connected to termi-

nals X, Y, Z and G2.

9 9 9

Decimal Point

Indicator

Time Range

Selector

Figure 15.

Digital Timer and Time Ranges.

The two digital timers feature the following informational

indicators and adjustment controls:

Each of the three input phase leads for both Source I and

Source II is shunted to ground by a capacitor–varistor

combination to provide surge protection to the control.

On the preferred source side of the voltage sensing cir-

cuitry, the input lines then pass through 10 Amp fuses to

the voltage sensing relays: R2 (Phase A), R9 (Phase B)

and R10 (Phase C). R9 and R10 are connected directly

to the input while N.O. contacts of R9 and R10 are in

series with the R2 coil. Thus, R2 can be energized only if

all three incoming phase voltages are above a predeter-

mined value (approximately 97 volts). A similar arrange-

ment is used for the alternate source sensing relays. R6

can be energized only if R7 and R8 are energized. The

transfer bus across the top of the schematic diagram),

which provides the operating power for the control is nor-

mally energized from Phase Y. If R7 drops out, due to

loss of Phase Y, R11 will be energized from Phase B

(through N.C. contact of R7) to re-energize the transfer

bus. The contacts of R7 and R11 are so connected that

the transfer bus can never be simultaneously energized

from both B and Y phases.

Digital Time Display

LED displays the time count. The timer counts up until it

reaches the time delay setting of the thumbwheel switch.

Time Range Selector

The time range selector switch can be set to six different

positions with a flat screwdriver. Each position indicates a

time range. See chart below. The time range selector is

preset to the time range of 0.1 to 99.9 seconds.

9.99

99.9 999

99.9

999

99.9

Indication

0.1

99.9

min

0.01

9.99

sec

Time

Range

99.9

hours

99.9 999

sec sec

999

min

Thumbwheel Time Setting

IMPORTANT: Thumb-wheel time setting must be

securely turned. Incomplete setting may cause timer

malfunction and control misoperation.

Set the desired time delay setting by rotating the thumb-

wheel switch. For example, if the thumbwheel time set-

ting is 345 the timer will time out in 34.5 seconds based

off the time range selector setting of 0.1 to 99.9 seconds.

Note: The thumb-wheel time setting, which does not turn

infinitely, should not be turned beyond the limit.

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

The transfer of R1 energizes the close coil of SW-I as follows:

Automatic Transfer, Preferred to

Alternate

Transfer bus voltage passes through terminals 5-1 of S3,

contacts 9-6 of latched R1, and terminals 5-6 of S5. It is

then impressed on N.C. contact 7-2 of R5 and passes

through deck A of S4 to output terminal 15 of TB-1. This

activates the close coil in SW-I. When SW-I closes, its

auxiliary contact “a” closes to energize R5 (via TB1-24

and deck E of S4). Contact 7-5 of R5 closes to energize

TB1-23 through deck D of S4. Voltage at TB1-23 will

actuate the trip coil of SW-II to open the Source II high-

voltage transfer switch.

The following assumptions are made:

• OPERATION SELECTOR switch (S3) is in AUTO.

• SOURCE PREFERENCE and RETURN MODE

switch (S4) is in PREF l-P (Terminal 2 of each deck

connected).

• CONTROL MODE switch (S5) is in NORMAL.

• S control is in a quiescent state.

Note: The Source I high-voltage switch (SW-I) closes before

the Source II high-voltage switch (SW-II) opens to

effect a parallel return transition. SW-I will now remain

closed and SW-II open until Source I voltage is lost or

a change of control settings is made.

• Source I high-voltage transfer switch (SW-I) is closed

and Source II high voltage transfer switch (SW-II) is

open.

Note: The actuators of both high-voltage transfer switch-

es are shown in the switch open position on the

schematic diagram. Following each opening opera-

tion, the motor recharges the actuator springs and

the cutout switch returns to the position shown in

the schematic. However, when the high voltage

transfer switch is closed, the selector switch of the

actuator mechanism is opposite to that shown in

the schematic.

Return Transfer, Non-Parallel

Transition

The following assumptions are made:

• SOURCE PREFERENCE and RETURN MODE

switch (S4) is in PREF l-NP (Terminal 3 of each

deck connected).

If one or more phases of the preferred source (Source I)

are lost, R2 will drop out and the SOURCE I ENER-

GIZED lamp (L1) will go out. N.C. contacts 1-7 of R2

close completing the circuit to the PREFERRED TO

ALTERNATE TlMER (TM1) through 4-7 of R6 (which is

energized), 7-4 of R1, and deck J of S4. When TM1 times

out, its 5-6 contacts close to energize the coil of R1 in the

reset direction causing R1 to transfer. Diodes in the cir-

cuit of this single-coil magnetically held relay determine

whether “latching” or “resetting” occurs.

• Source I has lost one or more phases and the load

has been transferred to Source II as previously

described (SW-I open and SW-II closed).

• Control is in a quiescent state with latching relay R1

in the reset position (contacts 9-3 and 8-2 closed)

and R2 is deenergized.

When Source I power is restored on all three phases, R2

will pick up, closing its contact 9-6, and energize the

ALTERNATE TO PREFERRED TIMER (TM-2) through

contact 8-2 of R1, and deck K of S4. After TM-2 times

out, its 5-6 contact closes to energize the coiI of R1

through diode DL in the latching direction causing R1 to

transfer, closing its 6-9 contact.

The transfer of R1 energizes the trip coil of Source I high-

voltage transfer switch (SW-I) as follows:

Transfer bus voltage passes through terminals 5-1 of S3,

contact 9-3 of energized R1, and terminals 4-3 of S5. It

is then impressed on N.C. contact 7-2 of R4 and passes

through deck B of S4 to output terminal 13 of TB-1.

Terminal 13 is connected to the internal selector switch in

the actuator of SW-I (which is closed when SW-I is

closed), through the trip coil to ground (terminal G).

In this case, the trip coil of SW-II is immediately ener-

gized through the following circuit:

Terminals 5-1 of S3, N.C. contact 9-6 of R1, terminals 5-

6 of S5, N.C. contact 7-2 of R5, and deck D of S4 to out-

put terminal TB1-23 to activate the trip coil of SW-I I and

open to Source II high-voltage transfer switch.

After SW-I has opened, the selector transfers to connect

terminal 3 to terminal 4, which energizes terminal 16 of

TB1. In turn contacts 2-6 of S3, deck C of S4, and termi-

nal 25 of TB-1 are energized to operate the close coil of

SW-II and close the switch.

When SW-II opens, its selector switch transfers to

impress the voltage at TB1-23 onto TB1-26 which, in turn,

energizes TB1-15 through terminals 3-7 of S3 and deck A

of S4. Voltage at TB-15 will actuate the quick-close coil of

SW-I to close the Source I high-voltage switch.

SW-I will now remain open and SW-II closed until Source

I voltage is restored.

Note: In this instance, the Source II high voltage switch (SW-

II) opens before the Source I high voltage switch clos-

es, to effect a non-parallel return transition. SW-I will

now remain closed and SW-II open until Source I volt-

age is lost or a change is made in the control settings.

Return Transfer, Parallel Transition

When Source I power is restored on all three phases, R2

will pick up and Source I Energized lamp (L1) will light.

Contact 9-6 of R2 closes to energize ALTERNATE TO

PREFERRED TIMER (TM-2) through contact 8-2 of R1,

and deck K of S4. After TM2 times out, its contacts 5-6

close to energize the coil of R1 through diode DL in the

latching direction causing R1 to transfer.

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SAFETY

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S260-75-1

No Preference Mode

Manual Control

Assume the Source I high-voltage switch (SW-I) is

closed and Source II high-voltage switch is open. With

the SOURCE PREFERENCE and RETURN MODE

switch (S4) in NO PREF-NP (Terminal 4 of S4 connect-

ed), loss of Source I voltage on one or more phases will

open the Source I high-voltage switch (SW-I) as

described in the Automatic Transfer, Preferred to

Alternate section of this discussion.

When the OPERATION SELECTOR switch (S3) is

placed in MANUAL, it connects the MANUAL OPER.

SOURCE I switch (S1) and the MANUAL OPER.

SOURCE II switch (S2) to the transfer bus. Power can

then be supplied to either the close or trip coils of either

SW-I or SW-II. Contacts 3-7 and 2-6 of S3 are opened in

the MANUAL position so that opening of one high-volt-

age transfer switch does not cause automatic closing of

the other. In the manual mode of operation, it is possible

to have both high-voltage switches open, either switch

closed, or both switches closed.

Upon restoration of Source I voltage, R2 is re-ener-

gized. However, due to the positioning of decks G and

H of S4, neither timer can be energized since both the

N.C. contacts 1-7 of R2, and 9-3 of R6 are open (both

relays are energized).

Indicating Lamps

The LAMP TEST switch (S6) is provided for checking the

various incandescent indicators on the front panel of the

S control. In the closed position, all the lamps will be

energized through a diode network to check their condi-

tion.

The S control is now in a quiescent state with SW-II

closed and SW-I open. This condition will continue until

either Source II is lost or a change is made in the control

settings. If Source II is lost, delay in transfer to Source I

will be timed by TM-2.

In the open position, the diode network isolates the

lamps from the test switch so that it has no effect on nor-

mal circuit operation.

Preferred Source II Mode

With the SOURCE PREFERENCE and MODE switch

(S4) in either PREF II-P (Terminal 6 of S4 connected), or

PREF II-NP (Terminal 5 of S4 connected) the description

of operation is similar to the “Automatic Transfer,

Preferred to Alternate” and “Return Transfer, Parallel

Transition” or “Return Transfer, Non-Paralleled

Transition” as previously described except that Source II

is the preferred source (controlled by SW-II) and Source

I is the alternate source (controlled by SW-I).

Control Mode Switch, S5

If S5 is placed in the center-off TEST position, there is no

circuit to either the close or trip coils of either high-volt-

age transfer switch. This position of S5 is used to check

sensing circuitry, timers, and the latching relay without

affecting the status of the high-voltage switches.

If S5 is placed in the HOLD ON ALTERNATE position,

return transfer will not occur after preferred source volt-

age is restored. Assume the S3 is in AUTO, S4 is in

PREF l-P, and the S control is in the quiescent state with

Source I high voltage (SWI) closed and Source II high-

voltage switch (SW-II) open. Upon loss of Source I, R2

will again initiate a transfer of the latching relay R1 as

previously described, followed by the opening of SW-I

and the closing of SW-2. The S control is now in a qui-

escent state in which SW-2 will remain closed and SW-I

will remain open even when Source I power is restored.

When Source I is reenergized, R1 will transfer back to

the latch position and close its contact 9-6. However,

because deck L of S4 is open, power cannot be provided

to the trip coil of SW-II or the close coil of SW-I.

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

TROUBLESHOOTING—BASIC S CONTROL

CAUTION: Equipment misoperation. Do not

Basic Troubleshooting

energize this equipment until all control settings

A quick check of the basic transfer operation while the con-

have been properly programmed and verified. Refer to

the Control Programming and Operation section of this

manual for programming procedures. Failure to com-

ply can result in misoperation (unintended operation),

trol is in service can be made using the following procedure:

Source I or Source II Preferred

Operation

equipment damage, and personal injury.

G118.1

1. Set CONTROL MODE switch (S5) to TEST. This wilI

remove the control from service and allow it to operate

without operating the high-voltage transfer switches.

WARNING: Hazardous voltage. Solidly ground

all equipment. Failure to comply can result in

2. Check LATCH RELAY STATUS TEST terminals (T-1,

T-2) to ground (T-3). 120 Vac at T-1 indicates the con-

trol is in Source I mode; 120 Vac at T-2 indicates the

control is in Source II mode. Check if this agrees with

the SOURCE PREFERENCE switch setting.

death, severe personal injury, and equipment damage.

T223.2

General

3. Remove preferred source voltage by unscrewing one

of the phase fuses from the applicable source. The

PREFERRED TO ALTERNATE TIMER will start.

This troubleshooting guide is intended to assist in localiz-

ing problems that may be encountered in the operation of

the load-transfer scheme. After the problem area has

been localized, general troubleshooting and circuit tracing

techniques can be used to pinpoint the cause. A funda-

mental understanding of the basic operation is essential

in carrying out these troubleshooting procedures. (See

Theory of Operation section.)

4. When the timer runs out, the latch relay (R1) will

transfer; indicated by a transfer of the 120 Vac signal

at the test terminals.

5. Replace the removed fuse to re-energize the pre-

ferred source. The ALTERNATE TO PREFERRED

TIMER will start.

Schematic diagrams, Figures 16 and 17, are used as

references throughout this guide. The physical location

of the various circuit components and terminals are

identified in Figure 27.

IMPORTANT: If Control Mode Switch S5 is placed in

the “Normal” position, the S-control will place the high-

voltage transfer switches into the configuration that is

currently selected by the Source Preference Switch

S4. This may result in an unintended transfer. Make

sure the desired state of the high-voltage transfer

switches match the setting of S4 before returning S5 to

the “Normal” position.

Remove the Control from Service

DANGER: Hazardous voltage. Contact with haz-

ardous voltage will cause death or severe per-

sonal injury. Follow all locally approved safety proce-

dures when working around high and low voltage lines

6. When the timer runs out, the latch relay (R1) will

and equipment.

G103.3

transfer back to its original operating position.

7. Return the CONTROL MODE switch (S5) to NOR-

The following warning only applies to controls

equipped with the Fault Block Accessory:

MAL to return the control to service.

WARNING: Hazardous Voltage. De-energize

switchgear before attempting to disconnect con-

trol cable from control. Failure to do so may result in

contact with high voltage pulse (300V peak) from the

CT protection circuit. Failure to de-energize switchgear

can result in contact with high voltage, which will cause

death or severe personal injury.

G124.0

1. De-energize Source I and Source II voltage.

2. Disconnect cables from the control.

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S260-75-1

No Preference Operation

Indicating Lamps

Although not essential to control operation, the indicating

lamps provide useful operating information. All lamps are

120 Vac operated half-wave through diodes.

1. Set CONTROL MODE switch S5 to the TEST posi-

tion. This will remove the control from service and

allow operation without operating the high-voltage

transfer switches.

For a quick check of the lamp diodes, depress the LAMP

TEST switch, S6. The two OPEN and two CLOSE lamps

should glow with equal brilliance, the green appearing

slightly less intense, and the SOURCE I ENERGIZED

and SOURCE II ENERGIZED lamps should noticeably

increase in brilliance (these lamps are energized from

two phases, 120 degrees apart, instead of a single bus).

2. Check the setting of the SOURCE PREFERENCE

switch (S4). It should be in the center No Preference

position.

3. Check LATCH RELAY STATUS TEST terminals (T-1,

T-2) to ground (T-3). 120 Vac at T-1 indicates the con-

trol is in the Source I mode. 120 Vac at T-2 indicates

the control is in the Source II mode.

Note: The OPEN lamp circuit includes the impedance of

the close coil or motor of the high-voltage switch

actuator.

4. Remove source voltage by unscrewing one of the

phase fuses from Source I if T-1 is energized or from

Source II if T-2 is energized. If a Source I fuse is

removed, the PREFERRED TO ALTERNATE TIMER

will start. If a Source II fuse is removed, the ALTER-

NATE TO PREFERRED TIMER will start.

Verification of Fuses

Fuses can be checked on the front panel of the control.

If the fuses are blown and require replacement, the white

buttons on the front panel will show. Refer to item 15 in

Figure 13 and Table 4.

5. When the timer runs out, the latch relay (R1) will

transfer as indicated by a transfer of the 120 Vac sig-

nal at the test terminals.

Advanced Troubleshooting

IMPORTANT: The control should be removed from

service prior to conducting the advanced troubleshoot-

ing procedures.

6. Replace the removed fuse to re-energize the power

source. No timers will start and latch relay (R1) will

not transfer.

7. Unscrew one of the phase fuses from the other

source. If a Source II fuse is removed, the ALTER-

NATE TO PREFERRED TIMER will start. If a Source

II phase fuse is removed, the PREFERRED TO

ALTERNATE TIMER will start.

Use the output of the control procedure to determine if

the problem lies in the control or the high-voltage switch-

es. If the conditions of the output procedure are satisfac-

tory, test the high-voltage switch. If the conditions of the

output procedure are unsatisfactory, test the manual con-

trol functions. If the conditions of the manual control func-

tions procedure are satisfactory, test the automatic con-

trol functions.

8. When the timer runs out, the latch relay (R1) will

transfer back to its original operating position, again

indicated by a transfer of the 120 Vac signal at the

test terminals.

9. Replace the removed fuse to re-energize the power

source. No timers will start and latch relay (R1) will

not transfer.

10. Place the CONTROL MODE switch (S5) to the normal

position. If switch S5 is left in the TEST position, the S

control will be inoperative on automatic operation.

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

Output of the Control

TABLE 5

Continuity Check of High-Voltage Switches

To determine if the problem is in the control or the high-

voltage transfer switch, proceed as follows:

Switch

Ohmmeter Reading

Receptacle

Type VR, VLR, VRV — Standard Operator

1. Disconnect the switches from the control.

Switch Open

Switch Closed

2. Place OPERATION SELECTOR switch (S3) to

MANUAL.

B to C

B to D

B to E

D to F

Motor

∞

Trip Coil

3. Place SOURCE PREFERENCE and RETURN

MODE switch (S4) to NO PREF.

4. With the control energized, check the voltage to

ground at the “Transfer Switch Operators” terminal

board, TB1, per Table 6.

Type VR, VLR, VRV — Quick Close Operator

A to D

B to C

B to D

B to E

D to F

∞

Quick Close Coil

∞

Trip Coil

5. If these output voltages are obtained, check the high-

voltage switch. If the output voltages are not

obtained, check the manual control functions.

Type TSC

B to C

B to F

B to E

D to F

Motor

∞

Motor

High-Voltage Switch

∞

Normal control output at TB1 but failure to operate sug-

gests a malfunctioning switch.

∞

Type PST-6 with C Interrupter #1

1. With an ohmmeter, check the resistance between

E to R

M to N

P to E

S to V

T to U

Close Coil

∞

points of the high-voltage switch actuator per Table 5.

∞

2. If the control circuit of the switch operator checks out,

the trouble may be mechanical. Refer to the mainte-

nance manual for the switch.

Trip Coil

Type PST-6 with C Interrupter #2

B to C

D to E

E to F

G to K

H to J

∞

Close Coil

∞

Trip Coil

Type PST-9 with C Interrupter #1

E to F

A to C

C to E

B to C

C to D

∞

Type PST-9 with C Interrupter #2

L to M

G to J

J to L

H to J

J to K

∞

Trip Coil

∞

Close Coil

* Will read motor resistance if closing spring is not charged, will

read infinity if closing spring is charged.

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S260-75-1

Manual Control Functions

Automatic Control Functions

Abnormal output readings at TB1 indicate a malfunctioning

control. This procedure describes the terminal functions

under manual direction and suggests areas for investigation.

The control may operate properly by manual direction but

malfunction in its automatic mode. The automatic section

responds to the positions of R2 and R6 in conjunction

with the selected operating mode as set on S4, the

SOURCE PREFERENCE and RETURN MODE switch.

Its output is the single-coil latching relay, R1.

1. Terminals 11 and 21 provide the power to charge the

springs in the switch actuator and are constantly

energized. If terminals 11 and 21 are not energized,

the transfer bus is not energized.

1. R2 is energized from phase A of Source I through

N.O. contacts of R9 in phase B and R10 in phase C.

The action of R2 can be observed through its trans-

parent cover and can be checked electrically across

tabs 31 and 32 on the relay tie board which connect to

a N.C. contact of the relay.

A. Make sure that either phase B of the preferred

source or phase Y of the alternate source is ener-

gized. These phases supply the transfer bus.

Measure beyond the fuses.

B. Relays R7 and R11 control power to the transfer

bus. Relay R7 picks up when phase Y is ener-

gized; Relay R11 picks up if phase B is energized

and phase Y is deenergized.

2. R6 is similarly energized from phase X of Source II

through R7 in phase Y, and R8 in phase Z. Tabs 41

and 42 connect to a N.C. contact of R6.

3. Operation of the appropriate time delay relay can be

2. Terminals 15 and 25 provide 120 Vac closing power

(15 closes Source I switch, and 25 closes Source II

switch). Terminals 13 and 23 provide 120 Vac open-

ing power (13 opens Source I switch and 23 opens

Source II switch).

checked by verifying that the LED timer is illuminated.

4. The single-coil latching relay (R1) is electrically oper-

ated and magnetically held. It is latched directly from

the 120 Vac transfer bus through diode DL in the auto-

matic mode or diode DL1 in the manual mode. It is

reset through the 15 K ohm resistor and either diodes

DR or DR1.

A. Terminals 13, 23, 15 and 25 are energized from

the transfer bus through the MANUAL OPER.

switches, S1 and S2.

5. With the control in an automatic mode of operation,

the position of the latching relay can be determined at

the Latching Relay Test jacks (T1, T2, T3) on the front

panel of the control.

(1) If the control is equipped with the fault block

accessory, normally closed contacts of the fault

block relay (RY1) are connected between tabs

FP and FR of the relay tie board to complete the

circuit to terminal 15 and between tabs FS and

FT to complete the circuit to terminal 25.

A. When 120 Vac is present between T1 and T3, the

relay is in the “latched” position and the control

seeks to connect the load to Source I.

(2) If the control does not use the fault block

accessory, jumpers are provided between tabs

FP and FR and FS and FT of the relay tie board

to complete the closing power circuits to the

transfer switches.

B. When 120 Vac is present between T2 and T3, the

relay is in the “reset” position and the control seeks

to connect the load to Source II.

C. If the latching relay assumes the expected position

after the proper time delay, the automatic section

of the control is functioning properly.

3. Terminals 14 and 24 are grounded by an “a” contact

(N.O.) in the H.V. transfer switches to energize relays

R4 and R5 respectively during the “opening” half of a

parallel return transfer.

4. Terminals 16 and 26 are energized (120

TABLE 6

Voltage Readings on TB1

Vac) on the “closing” half of a non-parallel

return transfer. They are energized from a

“b” contact (N.C.) in the H.V. transfer switch-

es; 16 is energized from Source I high- volt-

age switch and 26 is energized from Source

II high-voltage switch.

Voltage to Ground

MANUAL OPER.

SOURCE I

MANUAL OPER.

SOURCE II

Term

Switch (S1)

Switch (S2)

TB1

Quiescent

Open

120 Vac

170 Vdc*

120 Vac

120 Vac 170 Vdc* 170 Vdc* 170 Vdc*

170 Vdc* 170 Vdc* 170 Vdc* 170 Vdc*

120 Vac

170 Vdc*

120 Vac

170 Vdc* 170 Vdc* 170 Vdc* 170 Vdc*

170 Vdc* 170 Vdc* 120 Vac 170 Vdc*

120 Vac

* Rectified 120 Vac impressed on capacitor. Drops to 0 if LAMP TEST

switch (S6) is depressed.

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

SAFETY

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Figure 16a.

Schematic diagram basic S control operating Types VR, VLR, VRV, TSC, or PST-9 switchgear (page 1 of 2).

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S260-75-1

Figure 16b.

Schematic diagram basic S control operating Types VR, VLR, VRV, TSC, or PST-9 switchgear (page 2 of 2).

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

Figure 17a.

Schematic diagram for Type S control operating Type PST-6 switchgear (page 1 of 2).

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Figure 17a.

Schematic diagram for Type S control operating Type PST-6 switchgear (page 2 of 2).

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

FAULT BLOCK ACCESSORY

(Applicable to VR, VLR, VRV, TSC, CS, and PST-6 switchgear.)

The fault block accessory is mounted in the upper right

corner of the back panel of the control, Figure 18. Controls

and instructions for operating the accessory are located

on the front panel above the input fuses, Figure 19.

To prevent the fault block accessory from being activated

due to inrush current that may occur as a result of the

backup opening and closing, an inrush restraint feature is

built into the accessory logic. Upon loss of the preferred

source voltage, the inrush restraint operates to increase

the phase fault actuating level by a predetermined multi-

ple for a predetermined time after voltage is restored.

Simultaneously, ground fault current detection is blocked

completely for the same time interval. When the time runs

out, both the phase and ground current actuating levels

return to their normal values.

General Description

In response to fault current above preselected phase or

ground levels, the accessory is activated and latched to

disable both high-voltage switches. Thus a load-side fault

followed by loss of potential will result in partial load

transfer opening the connected source but not closing

the faulted load into the alternate feeder.

To operate the fault block accessory, the Source I and

Source II high-voltage switches must be equipped with

1000:1 ratio current transformers to monitor the magni-

tude of the line current and an auxiliary “a” contact. The

bushing current transformers and associated wiring are

provided as a factory-installed accessory to the high-volt-

age switch.

The accessory must be manually reset at the control

panel to restore service to the load. If activation of the

fault block accessory is due to a temporary fault (pre-

ferred source voltage is restored before the transfer delay

timer runs out), line current of 5 Amps, or more, flowing

through the high-voltage switch will automatically reset

the accessory in approximately 10 to 15 seconds.

Accessory Settings

The selected phase and ground fault

ACTUATING LEVEL PRINTED

CIRCUIT CARD (FIGURE 18)

actuating levels should be greater

than any peak load phase current or

zero-sequence (ground) current, but

less than the trip setting of the back-

up protective device. A general rec-

ommendation is to set the phase

and ground actuating levels to

approximately 80% of the phase and

ground trip levels of the backup.

TERMINAL BLOCK FOR

EXTERNAL CONNECTIONS

The phase fault current minimum

actuating level is determined by a

plug-in circuit card, Figure 20.

Cards are available for 80, 112,

160, 224, 320 and 448 Amp actuat-

ing levels. The ground fault current

minimum actuating level is deter-

mined by a resistor cartridge that

clips on to the phase card.

Cartridges are available for 10, 14,

20, 28, 40, 56, 80, 112, 160, 224,

320 and 448 Amp actuating levels.

RAISED FAULT LEVEL

DURATION TIMER

020080KM

Figure 18.

Fault block accessory mounted in upper-right corner of the back panel.

INSTRUCTION LABEL

Provides instructions

for resetting the

fault block accessory.

FAULT BLOCK

RESET SWITCH (S7)

Reactivates the S control

after a fault block operation.

OPERATED SWITCH

Indicates that the fault block

accessory has operated.

020077KM

Figure 19.

Fault block accessory controls and operating instructions plate.

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S260-75-1

The actuating level multiplier for the inrush restraint fea-

ture for phase faults is set by a jumper wire connected

to a tab on the circuit card. Tabs are provided for X1, X2,

X4, X6, X8 and BLOCK settings. The duration of the

raised level is set by a knob on the top of the timer

(Figure 18). The timer is infinitely adjustable 0.1 to 5.0

seconds. No settings are required for ground inrush

since it is automatically blocked for the duration the

phase level is raised.

Theory of Operation

—Fault Block Accessory

The fault block accessory prevents automatic closure

into the alternate source when loss of preferred source

results from a fault on the load tap. The schematic dia-

gram for the fault block accessory, Figure 21, is used as

reference throughout this discussion.

Overcurrent Sensing

Operating Instructions

The output of bushing current transformers in both the

Source I and Source II high voltage switches are applied

to the fault block accessory via terminals lA, IB, IC, IN

and IX, IY, IZ, IN respectively. When the load current

through the switch exceeds the phase or ground actuat-

ing level selected, the relay contacts in the fault block

accessory (contacts 7-8 and 10-11 of relay RY1-B),

located in the closing circuits of both high voltage switch-

es, are opened. Subsequent closing of either switch is

blocked in either the automatic or manual mode of the S

control until the fault block accessory circuitry is reset.

The FAULT BLOCK OPERATED lamp on the front panel

of the control, Figure 19, will light when the fault block

accessory is activated. To reset the accessory:

1. Move the OPERATION SELECTOR switch (S3) to

MANUAL.

2. Depress and hold the RESET switch (S7) until the

lamp goes out, (approximately 6-10 seconds) indicat-

ing the accessory has reset.

3. To restore service, return the OPERATION SELEC-

TOR switch (S3) to AUTOMATIC; the preferred

source high voltage switch will close.

Phase Fault Operation

Referring to the accessory schematic diagram, Figure

21, the phase currents are rectified by the diode bridges

D103 through D116. Current out of the positive side of

the bridge passes through diode D127 and divides into

two parallel circuits. One circuit consists of zener D123

and the minimum phase actuating resistor R301 to the

other side of the bridge. The other circuit consists of nor-

mally closed contact (1516) of latching relay RY1, diode

D201, and capacitor C201 to the other side of the bridge.

C201, charged by load or fault current, provides tripping

energy for RY1.

Operate either the MANUAL OPER. SOURCE I switch

(S1) or the MANUAL OPER. SOURCE II Switch (S2),

as applicable, to restore service manually.

Note: Instructions for operating the fault block accessory

also are printed on the front panel of the control

(Figure 19).

The current through R301 produces a voltage drop pro-

portional to the line current which is impressed across

the series resistor string R101, R102, and R103. A por-

tion of this voltage is applied through diode D120 to the

base of transistor Q201.

When this voltage exceeds the break-down voltage of

zener D212 and the base emitter junctions of Q201 and

Q202, Q201 will conduct causing Q204 to conduct. In

turn, Q204 provides the gating current to turn on the SCR

(Q206) to discharge capacitor C201 through the trip coil

of the latching relay RY1. Contacts 10-11 and 7-8 of RY1

(in series with the close coils of the high voltage switch-

es) open to prevent the high voltage switches from clos-

ing until the fault block circuitry is reset.

PHASE CURRENT LEVEL

MULTIPLIER SETTING FOR

INRUSH CURRENT RESTRAINT.

An important feature of this accessory is that a trip signal

cannot be initiated until there is sufficient charge on C201

to activate the trip coil of RY1. Transistors Q201 and

Q204, effectively in series across C201, cannot conduct

until the voltage across C201 is sufficient to break-down

zener diodes D211 and D212.

GROUND-

ACTUATING

CURRENT

RESISTOR

CLIPS TO THE

PHASE CARD

020078KM

Figure 20.

Phase fault current actuating level printed circuit card.

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

SOURCE I

H.V. SWITCH

AØ

BØ

CØ

AØ

BØ

CØ

SOURCE II

H.V. SWITCH

PART OF

RESISTOR BOARD

GROUND ACTUATING

RESISTOR

R306

a²

SOURCE II

H.V. SWITCH

SOURCE I

H.V. SWITCH

Figure 21a.

Schematic diagram – fault block accessory (page 1 of 2).

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S260-75-1

MANUAL

V103

AUTO

D26

RY1

(120V BUS)

TRIP RESET BOARD

RY1

D201

TB4-1

D203

R209

47K

R216

47K

C201

150

RY1

TRIP

COIL

R210

TB4-2

Q204

2N2905

D202

C210

0.1

D201

D211

6.8V

1N4736A

C203

5.6

R204

10K

Q201

TB4-3

R211

100K

Q206

C5V

R218

120V IN MANUAL

Q202

C208

0.1

200V

TB4-4

D209

RESET

3PST

D212

5.1V

C204

3.0

C207

1.0

35V

R203

3.3K

R208

3.9K

1N4733A

MOMENTARY

TM1-2

TM1-3

R214

56K

C205

0.1

R213

1.8K

R205

100

R212

3.3MEG

C206

Q203

TM2-2

TM2-3

Q205

2N6119

C209

0.1

200V

D208

R217

47K

RY1

RESET

COIL

C202

150

R215

47K

R206

68K

R207

680K

D207

R202

470

D206

D204

R201

6.8K-2W

D205

RY1

LEGEND

ACCESSORY TERMINAL BLOCK (TB5)

ACCESSORY TIEBOARD TERMINAL

RELAY PIN (RY1 & RY2)

NO CONNECTIONS

EDGE CONNECTOR TERMINAL

(DIODE BOARD)

(RESISTOR BOARD)

(TRIP-RESET BOARD)

TAB ON RELAY BOARD OF S CONTROL

NOTE

LATCH RELAY CONTACTS (RY1) SHOWN WITH

RESET COIL LAST ENERGIZED

UNLESS OTHERWISE NOTED:

DIODES ARE 1N4004

TB4 TERMINAL STRIP OF S CONTROL

S3 & S7 TERMINALS

TRANSISTORS ARE 2N2102

RESISTORS ARE 1/2 WATT

RESISTOR VALUES ARE IN OHMS

CAPACITOR VALUES ARE IN MICRO-FARADS

TM1 (PREFERRED TO ALTERNATE TIMER) AND

TM2 (ALTERNATE TO PREFERRED TIMER) TERMINALS

Figure 21b.

Schematic diagram – fault block accessory (page 2 of 2).

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

Ground Fault Operation

Inrush Restraint Feature

The ground current (the vector sum of the phase cur-

rents) flows through the ground actuating resistor, R306,

to produce a voltage across the primary of input trans-

former TR1, proportional to the ground current. This volt-

age is stepped-up, rectified, and impressed across the

series resistor string R104, R105, R106 and R107. A por-

tion of this voltage is applied to the base of Q201 through

diode D119. From this point, ground and phase opera-

tions use common circuitry described in the preceding

“Phase Fault operation” discussion.

The inrush restraint feature raises the actuating level of

the fault block accessory by a multiple (or blocks its oper-

ation entirely) for a period following restoration of source

voltage or an automatic open transition transfer operation,

to prevent inrush currents from activating the fault block.

Relay RY2 is normally energized by the phase B or

phase Y voltages from the S control via the “a” auxiliary

contacts in the two high-voltage switches. When both B

and Y phase voltages are lost due to operation of a back-

up device or opening of the high-voltage switches, the

coil of RY2 is de-energized, closing its contacts. Contact

1-4 closes to insert a paralleling resistor across the

phase actuating resistor R301, reducing its effective

value and increasing the line current necessary to actu-

ate Q201. Contact 5-8 of RY2 closes to short-out the sec-

ondary of TR1, rendering the ground section operative.

Reset Circuits

Once actuated, the fault block accessory can be reset in

either of two ways.

• Manually—Actuating the Reset Switch, S7, on the

front panel of the S control, will apply 120 Vac to ter-

minal G of the fault block accessory tie board. This

voltage is rectified by diode D205 and applied to the

reset timing circuit, which consists of R201, C206,

and the programmable uni-junction (PUT) Q205. This

voltage is also applied to capacitor C202, which pro-

vides energy to the reset coil of latching relay RY1.

When the voltage across C206 reaches the break-

down voltage of the PUT, transistor Q203 is then

turned on causing C202 to discharge through the

reset coil of RY1. The relay transfers and the fault

block accessory is now reset.

Upon re-energization of either Phase B or Phase Y

through closing of the backup devices or the closing of the

high-voltage transfer switches, relay RY2 is energized.

RY2 has a built-in time delay programmable by means of

a knob in the top of the relay case. After the selected time

delay has elapsed, N.C. contacts 1-4 and 5-6 open,

returning the fauIt block accessory to normal operation.

Note: S7 is energized only when the Operation Selector

switch is in MANUAL.

• Automatically—by load current

below the minimum actuating

level flowing through the high-

voltage switch. The voltage

developed by the load current is

applied through contact 16-17 of

RY1 to the reset timing circuit

R207, C206, and Q205.When

the voltage across C206 reach-

es the breakdown voltage of the

PUT, Q203 is then turned on

causing C202 to discharge

through the reset coil of RY1.

The latching relay transfers and

the fault block accessory is

reset.

Note: If the load current is above

the actuating level of the

accessory, both manual and

automatic reset is defeated

by Q202 which conducts to

short-out the reset timing

capacitor C206 through

resistor R205.

Figure 22.

Test circuit for testing and troubleshooting the fault block accessory.

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Test Procedure and Troubleshooting

Phase Minimum Actuating Current

Testing Fault Block Operation

WARNING: Hazardous voltage caused by back-

feeding transformers. Isolate potential transform-

IMPORTANT: When checking the phase minimum

actuating current the ground fault sensing portion of

the accessory must be disabled. Testing on an individ-

ual phase basis without disabling ground fault sensing

will cause the accessory to activate at the ground fault

level.

ers from source bushings using potential transformer

dead-break disconnect switches located on the

source-side panel. Failure to do so will result in risk of

possible contact with high voltage at the source bush-

ings, which may cause death or severe personal injury.

T273.0

1. Disable the ground sensing circuit by shorting the

The operation of the fault block accessory can be

checked by backfeeding a 500:5 (or other available ratio)

current transformer, located in the primary loop of one

phase of the preferred source high-voltage switch, from a

variable 120 Vac source. The 500:5 ratio provides approx-

imately 1 Amp of output test current for every 10 mA of

input current. However, to eliminate error due to CT satu-

ration, a separate metering CT and meter should be used

to read the actual test current.

ground fault resistor (Figure 22).

2. Set the inrush current multiplier at X1.

3. Close test circuit switches SW2 and SW3 to apply

voltage to the control.

The preferred source high-voltage switch (HV1) will

close.

4. Close test switch SW1 and slowly raise the test current

until the FAULT BLOCK OPERATED light goes on.

Test Circuit and Equipment

The test current should be within the limits specified in

Table 7. If FAULT BLOCK OPERATED light fails to come

on at the expected level, proceed as follows:

A suggested test setup is shown in Figure 22. If the con-

trol is equipped with the plug and receptacle accessory,

use the existing cables to interconnect the motor opera-

tors of both high-voltage switches and the CT sensing

circuits of the preferred source switch to the S control. If

plugs and receptacles are not provided, wire the switch-

es directly to the appropriate terminal blocks as shown in

Figures 6 or 8.

A. Check lamp with LAMP TEST switch (S6).

B. Recheck calculations for proper meter reading.

C. Is ground resistor cleanly shorted out?

D. Did latch relay R1 transfer position?—lamp is only

an outward indication of relay position.

E. Are all cable connections secure?

F. Voltage from Accessory Tie Board, Tab D to

Ground, Tab L, should be approximately 15 Vdc,

average, at actuating level. If observed voltage is

approximately 6 volts too low, trouble is probably in

the Trip Reset Board; if voltage is too high, trouble

is probably in either Diode or Resistor Boards.

G. AC rms voltage from “IN” to “IA” (or whatever

phase is energized) should be about 17 V at actu-

ating level. If correct voltage is observed, the CT

input is correct.

TABLE 7

Test Current Values for Fault Block Accessory

Actuating

Current

Setting

Actuating Current Limits

(Amps)

Minimum

Maximum

020082KM

12.6

15.4

Figure 23.

Disabling ground sensing circuit.

25.2

50.4

50.8

61.6

112

160

101

144

123

176

274

320

448

247

250

403

301

352

493

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

5. Open SW1 and SW2 to simulate a backup clearing

10. Repeat step 8 and 9 for the other high-voltage switch

the fault.

to complete checking all six CTs, their connections

and polarity.

The PREFERRED TO ALTERNATE TIMER will start

and the preferred source high-voltage switch (HV1)

will open when the timer runs out, but the alternate

source high-voltage switch (HV2) will not close.

11. Remove the shorting jumper from the ground fault

resistor upon completion of phase testing.

Ground Minimum Actuating Current

If alternate source switch (HV2) closes and the latch

relay (R1) contacts are not opening, check for open

contact between Accessory Tie Board tabs P and R

(Source I HV switch) and tabs S and T (Source II HV

switch).

When checking the ground minimum actuating current,

the phase fault sensing portion of the accessory circuit

must be disabled to prevent the possibility of erroneous

test results. Proceed as follows:

1. Disable the phase sensing circuit by placing a short-

ing jumper from the BLOCK tab on the phase resistor

card to tab L on the accessory tie-board (Figure 26).

6. Place OPERATION SELECTOR SWITCH (S3) to

manual, and operate MANUAL OPER SOURCE I

switch (S1) and MANUAL OPER SOURCE II switch

(S2) to CLOSE.

2. Repeat steps 2 through 7 of the Phase Minimum

Actuating Current test procedure.

HV switch (HV1 or HV2) will not close.

Automatic Reset of Fault Block

If either switch closes and the latch relay (R1) con-

tacts are not opening, check for open contact

between Accessory Tie Board tabs P and R (Source

I HV switch) and tabs S and T (Source II HV switch).

1. Close test switches SW2 and SW3 to supply voltage

to the control.

The preferred source high-voltage switch (HV1) will

close.

7. Close test switch SW2 to restore preferred source

voltage to the control. After the ALTERNATE TO

PREFERRED TIMER runs out, reset the fault block

accessory per instructions on the front panel.

2. Close SW1 and raise the test current until the FAULT

BLOCK OPERATED lamp lights indicating that fault

block has been activated.

The FAULT BLOCK OPERATED light will go out and

the preferred source high-voltage switch will close.

3. Open SW2 to simulate the back-up device opening

and simultaneously open SW1 to clear the fault.

If the FAULT BLOCK OPERATED light does not go

out, the problem is most likely in the TRIP RESET

BOARD.

The PREFERRED TO ALTERNATE TIMER will start

to run.

4. Close SW2 to simulate reclosing of Source 1 back-

up device. Quickly close SW1 and raise the test cur-

rent to greater than 5 Amps but less than ground

actuating level.

Follow steps 8 through 11 to conduct a complete check

involving all the phases of both high-voltage switches.

8. Connect the phases in series as shown in Figure 24

The FAULT BLOCK OPERATED lamp will go out in

about 10-15 seconds indicating the accessory has

reset.

and retest.

Because of the series hook-up, pickup should occur

at 1/2 the actuating current setting.

If FAULT BLOCK OPERATED lamp does not go out,

the trouble is most likely in the Trip-Reset board

(assuming the previous tests had passed).

If pickup current is other than 1/2 of setting, the polar-

ity of a CT could be reversed.

9. Connect another two phases in series as shown in

Figure 25 and retest.

Results should be the same as in preceding step 8.

JUMPER

Figure 24.

Test Connections for Step 8.

Figure 25.

Test Connections for Step 9.

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SAFETY

FOR LIFE

S260-75-1

Inrush Restraint

If FAULT BLOCK OPERATED lamp does not light

immediately, then

The inrush-restraint feature prevents inrush currents

above the minimum actuating level from actuating the

accessory. This is accomplished by raising the phase

actuating level by some multiple for a predetermined time

after service is restored. Ground actuating level detection

is blocked for the duration of the raised phase actuating

level. Proceed as follows:

A. Recalculate expected current.

B. Verify that jumper on resistor board is on correct

tab.

If FAULT BLOCK OPERATED lamp still does not

light immediately, the resistor board may be defec-

tive. Contact your Cooper Power Systems represen-

tative.

1. Disable the ground sensing circuit by shorting the

ground fault resistor (Figure 26).

13. Remove the shorting jumper from the ground fault

2. Set the inrush-restraining multiplier on the phase actu-

ating card and the raised fault-level duration on the

timer to the values at which they are to be checked.

actuating cartridge upon completion of the test.

3. With the preferred source high-voltage switch (HV1)

closed, close test switch SW1 and raise the equiva-

lent test current to a value above the maximum actu-

ating level for the setting, but below the multiplied set-

ting. (See Table 7 for maximum current test values.)

“BLOCK” TAB

4. Without disturbing this current setting, open SW1.

5. Close test circuit switches SW2 and SW3 to apply

voltage to the control.

6. Momentarily close and open SW1 before the raised

duration timer runs out, to simulate an inrush current.

The FAULT BLOCK OPERATED lamp will not light.

If the FAULT BLOCK OPERATED lamp does light,

proceed as follows:

A. Recheck current calculations. (Test current should

“L” TAB

exceed actuation level but be less than inrush level.)

020083KM

Figure 26.

Disabling phase sensing.

B. Check if momentary faults were applied before

timer elapsed.

Return the Control to Service

C. Check if timing relay picked up after either HV1 or

HV2 was closed. Check presence or absence of 120

Vac at Accessory Tie Board terminal 17 when HV1

operates and terminal 28 when HV2 operates.

CAUTION: Equipment misoperation. Do not

energize this equipment until all control settings

have been properly programmed and verified. Refer to

the Control Programming and Operation section of this

manual for programming procedures. Failure to com-

ply can result in misoperation (unintended operation),

D. Check for trouble in delay relay contacts or resis-

tor board.

7. Close SW1 and leave closed to simulate a perma-

equipment damage, and personal injury.

G118.1

nent fault on the load side.

The FAULT BLOCK OPERATED lamp will light after

the raised duration timer runs out.

CAUTION: Equipment misoperation. Source I and

Source II high voltage switches can be paralleled in the

manual operation mode even if SOURCE PREFER-

ENCE switch, S4, is set for NP (non-parallel opera-

tion). Make sure both sources are in synchronism if a

manual parallel operation is to be performed. Failure to

comply can result in misoperation (unintended opera-

If FAULT BLOCK OPERATED lamp does not light,

the problems are similar to step 6 above.

8. Open switches SW2 and SW3 to remove voltage

from the accessory.

9. Raise the test current to a value just above the raised

tion) and equipment damage.

T304.0

multiple value.

10. Without disturbing this current setting, open SW1.

1. The control must be programmed with all the neces-

sary operating settings and verified by the appropri-

ate personnel prior to operation with energized

switchgear.

11. Again close switches SW2 and SW3 to apply voltage

to the control.

12. Close SW1 to simulate a high-level fault on the load

2. Verify status of high voltage switches according to

side of the switch.

system requirements.

The FAULT BLOCK OPERATED lamp will light imme-

diately indicating the fault is greater than the inrush

current restraining setting.

3. Reconnect cables and ground the control.

4. Apply Source I and Source II voltage to the control.

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

WIRING TABLES

Tables 21 through 40 identify the

point-to-point wiring between

circuit components.

Tables 36–40 apply to S Controls

with the Fault Block Accessory.

The physical location of the cir-

cuit components and their termi-

nals identification are shown in

Figure 27.

Location of circuit components wiring terminal identification.

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SAFETY

FOR LIFE

S260-75-1

TABLE 8

TABLE 10

TABLE 12

“A”

Surge Protector Circuit Board

TB1

Output Terminal Block

TB3

Terminal Strip

From

Color

BRN

ORG

GRN

WHT

From

Color

From

Color

Motor Lead

YEL

Motor Lead

WHT

Motor Lead

GRY

FU-A-1

FU-B-1

FU-C-1

Stud on

Cabinet

TB1-G2

Screw on

Back Panel

TB1-G1

TB2-G2

WHT

TM2-8

S6-4

TM2-7

S4(K-8)

TM1-7

S4(J-4)

TM1-8

S6-4

WHT

R-1

TB1-21

A-11

BLK

BRN

FU-X-1

FU-Y-1

FU-Z-1

TB1-11

TB1-13

VIO

WHT

BRN/WHT

BRN

Motor Lead

GRN

S1-3

A-13

R-47

S4(F-C)

A-14

BLK

YEL

BLK

RED

ORG

TABLE 13

YEL

ORG

TB1-14

RA(B-7)*

TB4

Terminal Strip

R-FR

D-15

A-15

S3-2

A-16

TB1-11

A-21

S2-3

A-23

BLU

RED

YEL

GRN

BLK

WHT

VIO

BRN

GRY

TB1-15

TB1-16

TB1-21

TB1-23

TB1-24

RA(A-7)*

RED

GRN

BLK

VIO

GRY

From

Color

D-L7

R-FN

L7-1*

L7-2*

S3-8*

S1-2

S7-1*

R-FG

S7-2*

ORG

GRN

BRN

RED

ORG

BRN

YEL

RED

TB1-25

TB1-26

WHT

BLU

S4(E-C)

A-24

R-FT

A-25

D-25

S3-3

A-26

GRN

WHT

GRN

ORG

BLU

TABLE 9

*Fault Block Accessory Connections

“D”

Diodes Circuit Board

TABLE 14

From

S6-1

S6-10

S6-7

L3-2

L4-2

Color

RED

BRN

RED

ORG

YEL

ORG

RED

YEL

FU-A

Source I – Phase A Fuse

TABLE 11

From

A-A

TB2-A

Color

BRN

RED

TB2

Input Terminal Block

R-A

BRN

From

Color

L5-2

L6-2

FU-A-1

FU-B-1

FU-C-1

RED

YEL

BLU

TB4-1

S6-5

S4(F-C)

TB1-15

S4(E-C)

TB1-25

TABLE 15

FU-B

C-2

TB2-G2

WHT

Source I – Phase B Fuse

BLU

GRN

From

A-B

TB2-B

Color

ORG

YEL

TB1-G2

TB2-G1

WHT

FU-X-1

FU-Y-1

FU-Z-1

GRY

BLK

RED/WHT

R-B

RED

TABLE 16

FU-C

Source I – Phase C Fuse

From

Color

A-C

TB2-C

GRN

BLU

R-C

ORG

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

TABLE 22

TABLE 23

TABLE 17

“R”

CONTROL MODE Switch

FU-X

Source II – Phase X Fuse

Relay Tie Board

From

FU-A-2

FU-B-2

TB-5-18*

FU-C-2

S4(B-8)

TB2(G-1)

T-3

FB-L*

Color

BRN

RED

BRN

ORG

WHT

ORG

RED

GRY

BLU

RED

BLU

RED

YEL

VIO

YEL

GRN

RED

BLU

YEL

BRN

GRN

YEL

BRN

BLK

GRN

BLU

BLK

BLU

GRN

BLK

VIO

From

S4(L-6)

S4(M-8)

R-4

T-2

T-1

Color

From

Color

RED

GRN

RED

ORG

RED

BRN

A-X

TB2-X

VIO

GRY

R-X

YEL

TABLE 18

R-5

FU-Y

Source II – Phase Y Fuse

S4(F-12)

S4(D-8)

TM1-3

TABLE 24

From

Color

A-Y

TB2-Y

WHT

BLK

LAMP TEST Switch

S1-4

R-Y

GRN

From

D-I

L1-1

R-I

Color

RED

BRN

S4(D-12)

S4(B-12)

TM1-6

S2-4

S4(E-2)

FU-X-2

FU-Y-2

TB5-27*

FU-Z-2

TB4-4

FB-G*

TB4-1

FB-N*

S4(A-C)

R-FR**

FB-P*

TB1-15

R-FP**

FB-R

S4(C-C)

R-FT**

FB-S*

TABLE 19

BRN/WHT

FU-Z

T-3

TB3-4

TB3-1

ORG

GRN

YEL

Source II – Phase Z Fuse

From

Color

A-Z

TB2-Z

BRN/WHT

RED/WHT

D-11

–

RED

–

R-Z

BLU

D-G

SW3-5

–

BRN

BLU

–

TABLE 20

D-II

L2-1

R-II

BRN

RED

GRY

TM1

PREFERRED TO ALTERNATE TIMER

From

Color

R-33

TM2-6

ORG

TABLE 25

TB3-4

R-R

TM2-8

BLK

YEL

SOURCE I ENERGIZED Lamp

From

S6-2

L2-2

Color

BRN

ORG

–

TB1-25

R-FS**

FB-T*

GRN

BLK

GRY

R-43

TM2-1

S7-8*

BRN

BLU

Used with

TABLE 26

capacitor

voltage sensing

accessory

TB3-3

BLK

SOURCE II ENERGIZED Lamp

TB2-3

R-L

S7-7*

RED

GRN

S6-3

S6-12

S5-3

S5-6

S3-5

TB1-11

FB-M*

L3-1

BRN/WHT

From

Color

GRY

RED

BRN

RED

BLK

ORG

VIO

BRN

BLK

WHT

ORG

GRN

R-II

L1-2

GRY

ORG

YEL

* Fault Block Accessory Connections

TABLE 21

TABLE 27

TM2

S3-1

ALTERNATE TO PREFERRED TIMER

SWITCH I OPEN Lamp

S4(G-6)

S4(G-2)

TM1-5

S4(J-C)

S4(L-C)

S4(H-8) BRN/WHT

S4(H-12) RED/WHT

TM1-2

S4(K-C)

S4(M-C)

TB1-13

S4(C-6)

From

TM1–6

TB3-1

TM1-8

–

Color

BRN

BLK

RED

–

From

Color

R-12

L4-1

VIO

D-L3

BRN

TABLE 28

–

BRN

YEL

BLU

BLK

GRY

TM1-1

S7-4*

ORG

SWITCH I CLOSED Lamp

From

Color

TB3-2

TM1-3

S7-5*

BLK

YEL

L5-1

L3-1

VIO

* Fault Block Accessory Connections

** Omit jumpers if fault block included.

D-L4

RED

* Fault Block Accessory Connections

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SAFETY

FOR LIFE

S260-75-1

TABLE 29

TABLE 30

SWITCH II OPEN Lamp

SOURCE PREFERENCE & RETURN MODE Switch

From

A-C

Color

BRN

VIO

From

G-4

G-5

G-6

H-C

R-32

R-31

Color

WHT

BLK

From

L6-1

L4-1

Color

VIO

R-FP

S1-1

R-38

A-2

A-3

A-4

A-5

A-6

B-C

B-8

B-9

B-10

B-11

B-12

C-C

D-L5

ORG

S3-5

S4(G-C)

R-41

VIO

Bare

BRN/WHT

TABLE 31

H-8

H-9

H-10

H-11

H-12

J-C

J-2

J-3

J-4

SWITCH II CLOSED Lamp

From

S1-3

R-D

ORG

L5-1

D-L6

Color

VIO

YEL

R-42

RED/WHT

R-34

S4(K-12)

ORG

Bare

R-P

R-FS

S2-1

YEL

GRN

YEL

TABLE 32

S4(K-12)

TB3-3

S4(K-10)

Bare

GRY

Bare

MANUAL OPER. SOURCE I Switch

C-2

C-3

J-5

J-6

From

Color

S3-7

VIO

C-4

C-5

C-6

D-C

D-8

K-C

K-8

K-9

K-10

K-11

K-12

L-C

L-2

L-3

L-4

L-5

L-6

R-44

TB3-2

YEL

WHT

S4(A-C)

BRN

S2-2

TB4-3

S1-5

TB1-13

S4(B-C)

R-L1

S2-6

S1-2

S2-4

RED

BRN

Bare

BLK

ORG

BLU

YEL

Bare

YEL

R-48

S2-3

R-K

GRY

BLU

S4(J-6)

S4(J-2)

Bare

D-9

D-10

D-11

D-12

E-C

R-M

RED

R-35

–

GRN

–

D-24

TB1-24

R-W

D-14

TB1-14

R-J

GRN

BRN

VIO

YEL

RED

GRY

Bare

WHT

S5-1

RED

E-2

F-C

M-C

R-45

T-2

BLU

BRN

TABLE 33

T1-T2-T3

F-12

G-C

G-2

G-3

M-8

M-9

M-10

LATCH RELAY STATUS TEST Terminal

From

S4(H-C)

R-32

S5-2

GRN

S4(L-C)

S5-5

Color

RED

S4(M-C)

S5-4

L2-2

S6-4

TB4-2

R-G

BRN

ORG

YEL

ORG

BRN

ORG

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

TABLE 38

TABLE 34

TABLE 36

“TB5”

MANUAL OPER. SOURCE II Switch

“FB”

Fault Block Accessory Tie Board

Fault Block Accessory

Terminal Block

From

Color

From

Color

BRN

RED

ORG

YEL

GRN

BLU

BRN

BLK

VIO

–

From

FB-17

RA(A-1)

R-B

RA(A-6)

FB-IA

FB-IB

FB-IC

FB-IN

IN₂

Color

S4(C-C)

S3-6

YEL

BLU

TB5-IA

TB5-IB

TB5-IC

TB5-IX

TB5-IY

TB5-IZ

R-FG

S3-12

TB5-IN

–

GRY

GRN

S1-2

S2-5

S3-9

TB1-23

S4(D-C)

RED

Bare

GRN

WHT

BLU

BRN

RED

ORG

R-R1

S1-6

VIO

YEL

IN₁

VIO

BLK

S2-2

S1-4

Bare

YEL

IN₂

IN₁

BLK

YEL

GRN

BLU

FB-IX

FB-IY

FB-IZ

R-Y

RA(B-6)

–

TABLE 35

R-FS

R-FP

VIO

GRN

RED

OPERATION SELECTOR SWITCH

R-11

RA(A-2)

ORG

BLK

From

R-22

TB1-16

TB1-26

–

Color

BRN

YEL

ORG

–

FB-28

RA(B-1)

WHT

TB5-17

TB5-28

–

GRY

WHT

–

TABLE 39

R-FT

R-FR

R-FN

R-G

GRY

BLU

YEL

RED

R-11

S4(H-C)

S6-8

RED

VIO

BLU

Fault Block RESET Switch

From

Color

BRN

RED

ORG

YEL

S2-1

S1-1

TB4-2*

S2-2

–

BLU

VIO

ORG

GRN

–

TB4-3

TB4-4

TM2-6

TM2-8

TM1-8

TM1-6

TABLE 37

FAULT BLOCK OPERATED

GRN

BLU

From

TB4-1

TB4-2

Color

BRN

RED

–

BLK

FB-D*

* Fault Block Accessory Connections

TABLE 40

“RA”

Fault Block Accessory Relay

From

TB5-17

FB-M

Color

GRN

BLK

TB5-18

A-24

TB5-28

TB5-27

A-14

BRN

GRY

WHT

RED

ORG

To assure correct receipt of any parts order, always

include the control type and serial number. Because of

Cooper Power Systems’ continuous improvement policy,

there may be instances where parts furnished may not

look exactly the same as the parts ordered.

REPLACEMENT PARTS

Parts listed and illustrated include only those parts and

assemblies usually furnished for repair. Because of the

ease, faster receipt, and greater economy of local

acquisition, the wiring, wire end terminations, and

common hardware parts are not included in the

replacement parts listing.

However, they will be completely interchangeable without

any rework of the control. All parts carry the same war-

ranty as the original control, i.e., against failure due to

defects in material or workmanship within one year from

date of shipment.

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SAFETY

FOR LIFE

S260-75-1

1, 2, 3, 5

1, 2, 3, 4

1, 2, 3, 5

1, 2, 3, 4

1, 2, 3, 6

1, 2, 3, 7

16, 17

18, 19, 20

20, 21

020076KM

Figure 28.

Front panel – replacement parts identification.

Front Panel Replacement Parts List

Index

No.

Catalog

Index

No.

Catalog

Number

Description

Number

Qty.

Description

Lamp socket

Socket fastener

Lamp

Lens, red (L4, L6)

Lens, green (L3, L5)

Lens, clear (L1, L2)

Lens, amber (L7)

Qty.

Diode circuit board assembly KCN120SA

Toggle switch, 4PDT (S3) KP2124A16

Toggle switch, DPDT (S1, S2) KP2124A6

Intermediate terminal strip

KP2361A1

KP2005A10

KP2276A3

KP2277A2

KP2277A5

KP2277A3

KP2277A4

(TB3, TB4)

Rotary selector switch (S4)

Switch knob

Knob lock

Lock backing

Self tapping screw,

6-32 x 1/2, stl

Spacer

Toggle switch, DPDT (35)

Toggle switch, 3PST (S7)

KP432ME

KCN199S

KCN149S1

KP107RS

KP497ME

Terminal post, black (T1, T2) KP2081A2

Terminal post, white (T3)

Toggle switch, 4PST (S6)

Digital timer

(TM1, TM2)

KP2081A1

KP2124A26

K751515106050A

KP3004A59

KP2124A21

KP2124A43

0.01 sec. to 99.9 hrs. range KP2159A2

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

4, 6

2, 6

3, 6

4, 6

3, 6

1, 5

11, 12

020080KM

Figure 29.

Back panel – replacement parts identification.

Back Panel Replacement Parts List

Index

Catalog

Number

KP978ME

No.

Description

Qty.

Relay (R1)

Relay (R8, R9, R10, R11)

Relay (R4, R5)

KP978ME

Relay (R2, R6, R7)

KP978ME

Relay retainer

Relay tie board subassembly

Surge protector board assembly

K999904310339A

KCN203S900

KCN125SA

Terminal block (TB2) (Consists

of the following components)

Terminal section

KP999904150097A 12

End piece

KP999904150064A

KP2076A50

Marker strip

Terminal block (TB1) (Consists

of the following components)

Terminal section

KP999904150097A 16

End piece

KP999904150064A

KP2076A50

Marker strip

Fuse holder

Fuse

KP124S

KP125S

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SAFETY

FOR LIFE

S260-75-1

020081KM

Figure 30.

Fault block accessory – replacement parts identification.

Fault Block Accessory Replacement Parts List

Index

No.

Catalog

Number

KCN144S1

KCN141S1

K881215332010Z

KP2020A1

Description

Relay retainer bar

Circuit board retainer bar

Wing nut, 10-32, stl

Elastic stop nut

Phase actuating current circuit

board (add proper current value to

complete catalog number: 80, 112,

160, 224, 320, 448, 640)

Qty.

KCN116S___

Ground actuating

current resistor

KCN142S___

(add proper current

value to complete

catalog number: 10, 14,

20, 28, 40, 56, 80, 112,

160, 224, 320, 448)

Diode board

Trip-reset board

Relay (RY1)

Time-delay relay (RY2)

Transformer

Zener diode

KCN114SA

KCN112SA

KP978ME

K999904310339A

KA234ME

KP4011A12

KCN110SA

Tie board

Terminal block (TB5)

(Consists of the

following components)

Terminal section

End piece

KP999904150097A

KP999904150064A

KP2076A50

Marker strip

Barrier

KCN167S1

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Type S Automatic Load-Transfer Control Installation, Operation, and Maintenance Instructions

SAFETY

FOR LIFE

P.O. Box 1640

Waukesha, WI 53187

Kyle^®is a registered trademark of Cooper Industries, Inc.

www.cooperpowe r .com

KDL

10/02

KA2048-291 Rev: 02

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