S&C AT-2, AT-3, AT-12 Source-Transfer Control Instruction sheet

S8C Type AT Source-Transfer Controls

I

Field Replacement

INSTRUCTIONS

I

TABLE OF CONTENTS

I

Section

INTRODUCTION

Page

Number

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

Section Page

Number

REI’LACING TYPE AT-2 SOURCE-TRANSFER CONTROL IN

REPLACING TYPE AT-2

OR TYPE AT-3 SOURCE-TRANSFER

CONTROL IN METALENCLOSED SWITCHGEAR

.

.

. . . . .

.2

WEATHERPROOF ENCLOSURE APPLICATION

. . . . .

REI’LACING TYPE AT-12 SOURCE-TRANSFER CONTROL

.

. .

.7

. . .

I

INTRODUCTION

I

The equipment covered by this publication must be selected

for

a specific application and it must be operated and maintained by qualified persons who are thoroughly trained and who understand any hazards that may be involved. This publication is written only for such qualified persons and is not intended to be a substitute for adequate training and experience i n safety procedures

for

this type

of

equipment.

This

publication provides instructions for replacing an

%!kc

Transfer Control, when such replacement is indicated i n 1

Instruction Sheet 514-520, “S&C Type AT Source-

Transfer Controls: Troubleshooting Guide.”

S&C ELECTRIC CANADA

S&C ELECTRIC COMPANY

New Publlcatlon @1993

Chicago

LTD.

0

Toronto January

INSTRUCTION SHEET

5

1

Page

1

of

24

31,1994

Sac

Type

AT Source-Transfer Controls

I

Field Replacement

I

REPLACING TYPE AT-2

OR TYPE AT-3 SOURCE-TRANSFER CONTROL

IN METAL-ENCLOSED SWITCHGEAR

step 1

on

the Type

AT

control faceplate in the “MANLJAL” position. See Figure

1. step 3

control

AT from

the switchgear-bay stile, until the latch at the rear of the control locks. See Figure 2.

step 2

Decouple t h e Type

MS-2

or

Type AS-30 Switch

Operators. Refer to the instruction sheet furnished for the switch operators.

Page 2 24 S&C ELECTRIC COMPANY

51

INSTRUCTION

SHEET

of

January 31,1994 S&C ELECTRIC CANADA

Chicago

LTD. Toronto

I

REPLACING TYPE AT-2 OR TYPE AT-3 SOURCE-TRANSFER CONTROL

IN METAL-ENCLOSED SWITCHGEAR - Continued

I

Manual/automatic operation selector switch

Overcurrent-lockout indicating lamp and reset liushbutton

(furnished when overcurrent-lockout feature-Catalog Number

Suffix “-K”-is included)

\

.

- Automatic-transfer .-

“ready” indicating lamp

Type AT-3 Control

Type AT-2 Control

Figure 1. Front-panel features of S&C Type AT-2 and Type AT-3 Source-Transfer Controls.

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INSTRUCTION SHEET

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1 d-525

Page 3 of 24

January 31,1994

S&C Type AT Source-Transfer Controls

1

IN METAL-ENCLOSED SWITCHGEAR - Continued

Field Replacement

I

REPLACING TYPE AT-2 OR TYPE AT-3 SOURCE-TRANSFER CONTROL step 4

Remove the input plug from the input receptacle located on the programming panel at the rear of the control and immediately transfer it to the shorting receptacle. See Figure 3.

1

step 10

Connect the ground wire to the underside of the replacement Type AT control enclosure. See Figure 4.

Step 11

Set the timer adjustment dials and operating-mode selector switches on the programming panel of the replacement Type AT control in accordance with the settings of the replaced control, as noted in Step 6.

Failure to immediately place the input plug on the shorting receptacle may result in damage to the voltage sensors and voltage limiters that will render the automatic-transfer scheme inoperative.

step 12

Place the manual/automatic operation selector switch on the replacement Type AT control faceplate in the

“MANUAL” position. See Figure 1.

This procedure short-circuits and isolates the secondaries of the voltage sensors, if furnished, and isolates the voltage transformers.

Step 5

Remove the left-hand entrance bay plug and the righthand entrance bay plug from their receptacles on the programming panel. See Figure 3. On Type AT-2 controls, make note of which source is the “preferred” and which is the “alternate,” so that the replacement control can be set accordingly. If thecontrol isfurnished

with optional remote-indication feature (Catalog

Number Suffix “-Al ‘I): Also remove the remoteindication output plug from its associated receptacle on the programming panel.

step 13

Connect the left-hand entrance bay plug and the righthand entrance bay plug to their receptacles on the programming panel of the replacement Type AT control. See Figure 3. On Type AT-2 controls, make sure that the “preferred” and “alternate” settings are in accordance with the designations noted in Step 5. If

the control is furnished with optional remote-

indicationfeature (Catalog NumberSuflix “-Al ‘): Also

connect the remote-indication output plug to its associated receptacle on the programming panel of the replacement Type AT control.

Step 6

Make note of the tuner-adjustment dial settings on the programming panel, as well as the settings of the operating-mode selector switches on the programming panel, so that the replacement control can be set accordingly. See Figure 3.

Step 7

Discpnnect the ground wire from the underside of the

Type AT control enclosure. See Figure 4.

Step 8

Remove and retain the four W-20X W hex-head stainless-steel cap screws and lo&washers at the top and bottom of the Type AT control enclosure, which secure the control to the telescoping support rails. See

Figure 2. Then remove the Type AT control.

Step 9

Set the replacement Type AT control into place and secure it to the telescoping support rails using the

W-20X W’ hex-head stainless-steel cap screws and lockwashers retained from Step 8. See Figure 2.

Telescoping support raiir

‘Ii’-20 x ‘12” hex-head stainless-steel cap screws and lockwashers

Figure 2. Type AT control in drawout position.

5

14-525 INSTRUCTION SHEET

Page 4 of 24

Janbarv 31.1994

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Toronto •

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I

REPLACING TYPE AT-2 OR TYPE AT-3 SOURCE-TRANSFER CONTROL

IN METAL-ENCLOSED SWITCHGEAR - Continued

Voltage-sensor signal adjustments and measurements

7

Input plug (signal-voltage, control-voltage, and currentsensing input circuits)

\

Voltage-sensor signaladjustment screws and test jacks

II

II

Timer-adjustment dials on Type AT-3

Controls Catalog -

Numbers 38891 and 38893

Timer-adjustment dials

Shorting receptacle,

Input receptacle

Fuseholders for voltage-transformer secondary fuses

\

\

Pushbutton test switches

to simulate loss of source voltage and, when the optional overcurrent-lockout feature

(Catalog Number Suffix “-K”) is included, an overcurrent condition

Operating-mode

L selector switches

for return transfer

I

. Selector switch included with optional open-phase detection feature (Catalog

Number Suffix “-Ll,”

“-L3,” or “-L4”)

Voltage-t1

Fuseholders for voltage-transfer

grounding circuit (contain solid slugs)

V

Rehote-indication

receptacle provided with optional remoteindication feature (Catalog

Number Suffix “-Al”)

Left-hand entrance bay and right-hand entrance bay plugs

Fuseholder and test jack arrangement

\ on Type AT-2 Control Catalog

Number 38881 and Type AT-3 Control

Catalog Number 38891, for use with three voltage transformers per source

- --.

.^.. -. .~

igure 3. Adjustment, testing, and programming features at rear of Type AT-Z Source-Transter Gonrrol r;aralog Numoer

38883, for use with two S&C Indoor Voltage Sensors and one voltage transformer per source. Insets show construction differences on other models.

INSTRUCTION SHEET 5 141525

Page 5 of 24

January 31,1994 m s&c ELECTRIC COMPANY

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Toronto

S&C Type AT Source-Transfer Controls

1

Field Replacement

REPLACING TYPE AT-2 OR TYPE AT-3 SOURCE-TRANSFER CONTROL

IN METAL-ENCLOSED SWITCHGEAR - Continued step 14

Remove the input plug from the shorting receptacle and immediately transfer it to the input receptacle.

See Figure 3.

step 15

Refer to Instruction Sheet 514-501, “S&C Source-

Transfer Controls-Type AT-2: For Two-Way Transfer,

Catalog Numbers 38881 and 38883” or Instruction

Sheet 514-506, “S&C Source-Transfer Controls-Type

AT-3: For Two-Way Transfer with Bus-Tie Switch,

Catalog Numbers 38891 and 38893” and perform the procedures described therein in the “ADJUSTMENTS

AND PROGRAMMING” section. Then perform the procedures described therein in the “OPERATIONAL

TESTING (EXERCISING)” section.

Step 16

After operational testing has been completed, again place the manual/automatic operation selector switch on the replacement Type AT control faceplate in the

“MANUAL” position. See Figure 1.

step 17

Unlock the latch at the rear of the replacement Type

AT control and slou& push the control into the switchgear-bay stile. Secure the control in the stile by tightening the screw fastener. See Figure 2.

step 18

Couple the Type MS-2 or Type AS-30 Switch Operators.

Refer to the S&C instruction sheet furnished for the switch operators.

step 19

Place the manual/automatic operation selector switch on the replacement Type AT control faceplate in the

“AUTOMATIC” position and confirm that the automatic-transfer “ready” indicating lamp is illuminated.

Ground wire 2

Figure 4. Disconnecting ground wire from underside of Type AT control.

5

14-525 INSTRUCTION SHEET

Page 6 of 24

January 31,1994

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REPLACING TYPE AT-2 SOURCE-TRANSFER C6NTROL IN WEATHERPROOF

I

ENCLOSURE APPLICATION

Step 1

on the Type AT-2 control in the “ M A N U A L ” position.

See Figure 5.

Step 2

Decouple the Type AS-1A or Type

AS-10

Switch

S&C

instruction sheet furnished for the switch operators.

Step 3

Remove the voltage-transformer secondary fuses and grounding circuit slugs. See Figure 5.

Step

4

Remove the source 1 plug and the source 2 plug from their receptacles. See Figure

5.

Make note of which source is the “preferred and which is the “alternate,”

so

that the

If

the control is furnished with optional remote- indication feature ’T):Also

remove the remote-indication output plug from its associated receptacle.

step 5 as

well

as

switches,

so

that the

See Figure

5.

Step 6

llisconnect the ground wire from the underside of the

Type AT-2 control. See Figure

5.

Step 7

Remove and retain the four %“-2OX%” hex-head stainless-steel cap screws and lockwashers at the top and bottom of the Type AT-2 control, which secure

5.

Then remove the Type AT-2 control.

Step 8

Set the replacement Type AT-2 control into place and secure it to the weatherproof enclosure using the

Vi””20

X

%” hex-head stainless-steel cap screws and lockwashers retained from Step 7. See Figure

5.

I

I

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Toronto January

Chicago Page

INSTRUCTION SHEET

5

1

7 of 24

31,1994

SBC Type AT Source-Transfer Controls

I

Field

Replacement

I

REPLACING TYPE AT-2 SOURCE-TRANSFER CONTROL IN WEATHERPROOF

ENCLOSURE APPLICATION

-

step 9

Connect the ground wire to the underside of the replacement Type AT-2 control enclosure. See Figure 5.

Step 10

Set the timer adjustment dials and operating-mode

step 14

Refer to Instruction Sheet 514-510, “S&C Source-

Transfer Controls--Type AT-2: In Weatherproof

Enclosures” and perform the procedures described therein in the “ADJUSTMENTS AND PROGRAMMING” section. Then perform the procedures described therein in the “OPERATIONAL TESTING

“ section. in accordance with the settings of the replaced control,

as

noted in Step 5.

Step 15

After operational testing has been completed, again

Step 11

Place the manual/automatic operation selector switch

“ M A N U A L ” position. See Figure 5. on the replacement Type AT-2 control in the “MANUAL“ position. See Figure 5.

Step 12

Connect the source 1 plug and the source 2 plug to

Step 16

AS-10

Switch Operators.

Refer to the S&C instruction sheet furnished for the switch operators.

See Figure

5.

Make sure that the “preferred” and

“alternate” source settings are in accordance with the designations noted in Step 4.

If the control isfumzished

with optional remote-indication feature (Catalog

Number Suffix “-A1

’9:

Also

connect the remote- indication output plug to its associated receptacle on the replacement Type AT control.

Step 17

Place the manual/automatic operation selector switch on the replacement Type AT-2 control in the “AUTO-

MATIC” position and confirm that the automatic- transfer ‘‘ready” indicating lamp is illuminated.

Step 13

Replace the voltage-transformer secondary fuses and grounding circuit slugs. See Figure 5.

5

1

INSTRUCTION SHEET

Page 8 of 24 S&C ELECTRIC COMPANY

January 31,1994 S&C ELECTRIC CANADA LTD.

Chicago

Toronto

I

REPLACING TYPE AT-2 SOURCE-TRANSFER CONTROL IN WEATHERPROOF

ENCLOSURE APPLICATION - Continued

Time range selector switch

Voltage-transformer signalvoltage test jacks

Voltage-transformer secondary fuses and grounding slugs stainless-steel

Overcurrent-lockout pickup

level switch (furnished when overcurrent-lockout feature-

Catalog Number Suffix

“-Kl”-is included)

Pushbutton test switches to simulate loss of source voltage and (when overcurrent-lockout feature-Catalog Number Suffix

“-Kl” or “-K2”-is included) an o v e r c u r r e n t c o n d i t i o n

Operating-mode selector

switches for return transfer

Manual/automatic operation selector switch

Overcurrent-lockout indicating lamp and reset pushbutton

(furnished when overcurrentlockout feature-Catalog

Number Suffix “-Kl” or

“-K2”-is included)

Source-voltage indicating lamps

B’

Automatic-transfer “ready” indicating lamp

Fuseholders for signal-voltage and grounding circuits

\

Selector switch (furnished when open-phase detection feature-

Catalog Number Suffix “-Ll”-is included)

\

Ground wire

Control-voltage-seeking relay

Source 1 and source 2 plugs

Terminal strips for external connections

Remote-indication receptacle

(furnished when remoteindication feature-Catalog

Number Suffix “-Al”-is included)

Figure 5. Adjustment, testing, and programming features of Type AT-2 Source-Transter control In wearnerproor enclosure.

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Chicago

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INSTRUCTION SHEET 5 141525

Page g of 24

January 3l,lgg4

I

S&C Type AT Source-Transfer Controls

I

Field Replacement

I

REPLACING TYPE AT-I2 SOURCE-TRANSFER CONTROL

the pad-mounted gear, which is stamped on the nameplate affixed to the enclosure door. Note the

“ R supplement to the catalog number

. . . some of the steps which follow vary according to this

“R”

step 5

Remove the input plug from the input receptacle located below the programming panel and

immediately

9.

I step

1

Failure to immediately place the input plug on the shorting receptacle may result in damage to the voltage sensors and w render

step 2

Place the manual/automatic operation selector switch on the Type AT-12 control faceplate in the

“ M A N U A L ” position. See Figure 6.

step 3

For pad-mounted gear models having an

“Rl,

’’

or “R3”

supplement to the catalog number and furnished with optimal decoupling feature (Catalog

Number Suffix

“C8’J):

Decouple each stored-energy operator using the utility tool furnished. See Figure 7. labeled “Decoupling Socket.” Insert the utility tool

all the way into the soclcet

to depress the spring-loaded locking pin. While maintaining the locking pin depressed, turn the utility tool

counterclockwise

5 to

7 complete turns, until firm resistance is felt and the

“DECOUF’LED target is

centered

in the indicator port.

Remove the tool. Proceed to Step

4.

For

pad-mounted gear models having an

“R4”

supplement

to

the catalog number:

Decouple each stored-energy operator by grasping the associated decoupler and turning it

counterclockwise

5 to

6

complete turns, until firm resistance is felt and the

“DECOUPLED” target

is

centered

in the indicator port.

See Figure 8.

Step 4

Remove the bolted cover labeled “Source-Transfer

Control Switches and Timers” to gain access to the programming panel of the Type AT-12 control. See

Figure 9.

This procedure short-circuits and isolates the secon- daries of the voltage sensors and also isolates the current sensors utilized with the optional overcurrent- lockout feature (Catalog Number S u f f i

“-Y2”

if furnished.

Step

6

Remove the left-hand switch compartment plug and right-hand switch compartment plug from the preferred-source receptacle and alternate-source receptacle on the programming panel. See Figure 9.

Make note of which source is the “preferred” and which is the “alternate,” that the replacement control can be set accordingly.

is

optimal remote-indicatim feature (Catalog Number

Suffix

“-A1

’7:

Also

remove the remote-indication output plug from its associated receptacle on the programming panel.

Step 7

Make note of the timer-adjustment dial settings on the programming panel,

as

well

as

the settings

of

the panel,

so

that the replacement control can accordingly. See Figure 9. be set

5

1

INSTRUCTION SHEET

Page 10 of 24

January 31,1994 S&C

S&C ELECTRIC COMPANY Chicago

ELECTRIC CANADA LTD. Toronto

REPLACING TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued

Manual/automatic operation selector switch

Overcurrent-lockout reset pushbutton and indicating

lamp (furnished when overcurrent-lockout feature-

Catalog Number Suffix “-Y2” or “-Y3”-is included)

Source-voltage indicating lamps

. putomatic-transfer “ready”

Indicating lamp

Figure 6. S&C Type AT-12 Source-Transfer Control taceplare.

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INSTRUCTION SHEET 5 l&525

Page 11 of 24

January 3l,lgg4

S&C Type AT Source-Transfer Controls

1

Field Replacement

REPLACING TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued

Decoupling socket

Decoupling indicator

‘l4”-20 x %” round-head

‘stainless-steel screws (2)

Utility tool

- r o t a t e counterclockwise to decouple switch from switch operator

Hinged cover

Figure 7. Decoupling stored-energy operator. Applicable

to pad-mounted gear models having an “Rl,” “R2,” or “R3”

suppfement to the catalog number and furnished with

optional decoupling feature (Catalog Number Suffix “-C6”).

Figure 6. Decoupling stored-energy operator. Applicable to pad-mounted gear models having an “R4” supplement to the catalog number.

514m525

INSTRUCTION SHEET

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January 31,19Q4

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REPLACING TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued

Voltage-sensor signal adjust-

ments and measurements for preferred and alternate sources

Voltage-sensor signaladjustment screws and test jacks

Selector switch included

/ with the optional open-phase detection feature (Catalog

Number Suffix “-Yl” or “-Y3”)

Input plug (signal-voltage, control-voltage, and currentsensing input circuits)

Timer-adjustment dials

Remote-indication receptacle

(not visible) provided with optional remote-indication feature (Catalog Number

Suffix “-Y4”)

Pushbutton test switches to

simulate loss of source voltage and, when the optional overcurrent-lockout feature

(Catalog Number Suffix “-Y2” or “-Y3”) is included, an overcurrent condition

Operating-mode selector

switches for return transfer

Preferred-source and alternate-source connector

plugs-interchangeable, to allow selection of either source as preferred

. Shorting receptacle

Figure 9.

Type AT-12 Source-Transfer Control programming panel with bolted cover removed, showing adjustment, measurement, testing, and programming features of the control.

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Page 13 of 24

January 31,1994

S&C Type AT Source-Transfer Controls

1 Field Replacement

1 REPLACING TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued step 8

For pad-mounted gear moo!.& hating an ‘Rl, ” “R2, ” or “R3” supplement to the catalog number and furnished with optional decoupling feature (Catalog

Number Suffix “T8’3: Discharge each stored-energy operator quick-make, quick-break

mechanism using

the utility tool furnished. See Figure 10. For each storedenergy operator, open the emergency trip access cover and insert the utility tool into the socket on the shaft.

Turn the utility tool in the direction indicated to either

trip open or trip closed, as appropriate. Remove the tool. Or, on earlier models, turn the associated manual trip lever to the trip open. or trip closed position, as appropriate. For pad-mounted gear models having an

“Rl” or “R2” supplement to the catalog number, proceed to Step 9. For pad-mounted gear models having an “R3” supplement to the catalog number and horizontally split access panels as shown in Figure 14, proceed to

Step 10. For pad-mounted gear models having an “R3” supplement to the catalog number and vertically split access panels as shown in Figure 15, proceed to Step 11.

For pad-mounted gear models having an “‘R4”

supplement to the catalog number: Discharge each stored-energy operator quick-make, quick-break dual-purpose manual handle mechanism using the furnished. See Figure 11. For each stored-energy operator, open the emergency trip access cover and insert the keyed end of the dual-purpose manual handle into the groove of the tripping shaft. Turn the manual handle in the direction indicated to either trip gpen or trip closed, as appropriate. Proceed to Step 12.

I

Utility tool-

turn to trip open

or trip closed

position

Emergency trip access cover

igure 10. Discharging stored-energy operator quick-make,

quick-break mechanism. Applicable to pad-mounted gear models having an “Rl, ” “R2,” or “R3” supplement to the catalog number and furnished with optional decoupling feature (Catalog Number Suffix “-CS”).

J

Figure 11. Discharging stored-energy operator qurcK-maKe, quick-break mechanism. Applicable to pad-mounted gear models having an “R4” supplement to the catalog number.

5 l&525 INSTRUCTION SHEET

Page 14 of 24

January 31,1994

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•

* i

REPLACING TYPE AT-I2 SOURCE-TRANSFER CONTROL

-

Step

9

models

having an ”or

“R2” suppkm#at to the catalog number:

Remove the switch operator access panels from both the left-hand and right-hand sides of the low-voltage control compart- ment, using the following procedure. plate

on

its associated bottom switch operator access panel, to facilitate reassembly. See Figure 7.

Remove the two ‘/4“-20X %” round-head stainless- steel screws that secure each hinge plate to its associated bottom switch operator access panel.

Retain the hardware.

I

(a) Remove the bolted cover labeled “Terminal Blocks“ on each side. See Figure

12.

(b)

If

the pad-mounted

gear

is

optional decoupling feature (Catalog NumberSuffKx

“-C8’3:

Open the hinged cover labeled “Decoupling Socket”

If the pad-mounted gear is

not furnished with optional o!6coupling feature:

Remove the two

‘h”“20X

%“ hex-head stainless-steel cap screws, lockwashers, and flat washers located near the center

of

each bottom switch operator access panel. See Figure

13.

Retain the hardware. plate on its associated bottom switch operator access panel, to facilitate reassembly. See Figure 7.

Remove the two W-20

X

M” round-head stainless- steel screws that secure each hinge plate to its associated bottom switch operator access panel.

Retain the hardware.

f l the pad-mounted gear

is

not furnished with optional decoupling feature:

Remove the two

%“-20X

M” hex-head stainless-steel cap screws, lockwashers, and flat washers located near the e) Detach the bottom switch operator access panel on each side by removing the three

or four

W-20

X%” hex-head stainless-steel cap screws, lockwashers, and flat washers that secure each panel. See Figure

14.

Retain the hardware.

f )

Proceed to Step 13.

See Figure

(c) Detach the bottom switch operator access panel on each side by removing the three or four

1/4“-20 X %“ hex-head stainless-steel cap screws, lockwashers, and flat washers that secure each panel. See Figure

12.

Retain the hardware.

(d) Proceed to Step

13.

step 10

For pad-mounted gear models having an “R3” suppkrrwnt to the catalog number

and horizontally

split access panels as s h o w n

in Rgure

switch operator access panels from both the left-hand and right-hand sides of the low-voltage control compartment, using the following procedure.

(a) Remove the bolted cover labeled ‘Terminal Blocks” on each side. See Figure

14.

(b) Mark the positions of the middle and bottom stationary door latches on the center channel to facilitate reassembly. See Figure

14.

( c )

Detach the middle and bottom stationary door latches by removing the

~/1sf‘-18 X

1“ hex-head zinc- plated cap screws and hex nuts that secure the latches in place. See Figure

14.

Retain the hardware.

(d)

If

the pad-mounted gear decoupling feature (Catalog Number

S u f l k

‘‘-C8’9:

step

11

For pad-mounted gear models having an “R3” supplement to the catalog number and vertically split

access

panels as

operator vertical access panels from both the left-hand and right-hand sides

of

t h e low-voltage control compartment, using the following procedure.

(a) Remove the bolted cover labeled ‘Terminal Blocks” on each side. See Figure

15.

(b)

If thepadimrvuntedgear isfumzished with optional

decouplingfeature (Catalog Number SuffKx

“-C8’3:

Open the hinged cover labeled “Decoupling Socket” on each side and mark the position of each hinge plate on its associated switch operator vertical

7.

Remove the two

%“-20X %” round-head stainless- steel screws that secure each hinge plate to its associated switch operator vertical access panel.

Retain the hardware.

If the pad-mounted gear

is

not furnished with optional decoupling feature:

Remove the two

%“-20 X

? h n

hex-head stainless-steel cap screws, lockwashers, and flat washers located near the center of each switch operator vertical access panel. See Figure

13.

Retain the hardware.

(c) The switch operator vertical access panel on each side is secured by five ‘/4””20X%” hex-head stainless-steel cap screws, lockwashers, and flat washers. See Figure

15.

Two wire leads are connected to the charging-shaft access port switch on the back of each panel. Remove the five screws and associated lockwashers and flat washers from on each side and mark the position of each hinge

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INSTRUCTION SHEET

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15 of 24

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S&C Type AT Source-Transfer Controls

I

1

Field ReDlacement

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REPLACING TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued

Operator target indicates whether stored-energy ooerator is in switch-ooen or switch-closed position and whether quick-make, quick-break mechanism is charged or discharged

\

Emergency-trip access cover

I

Charging shaft

Operation selector

Remote-control receptacle

(Catalog Number Suffix

Top switch operator access panel

%“-20 x J/4” hex-head stainless-steel cap screws, lockwashers, and flat washers

\

Bottom switch operator access panel target

I

Switch-position

I

Type AT-1 2

Source-Transfer Control

Termin~l-block compartment

\

Bolted cover provides access to the

AT-12 control’s programming panel

Hinged cover provides access to reverse-drive hub and, if decoupling feature (Catalog

Number Suffix “-C8”) is furnished, to decoupling sockets

Utility tool used for emergency manual tripping and, if optional decoupling feature is furnished, for decoupling stored-energy operator from interrupter switch

I

Decoupling indicator (furnished with optional decoupling feature)

lure 12. Low-voltage control compartment of pad-mounted gear models having an “Rl,, or --nz supplement

IO

me catalog

5 l&525 INSTRUCTION SHEET

Page 16 of 24

January 31,1994

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Toronto

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*

REPLACING TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued

each switch operator vertical access panel,

taking

care not to damage the wire leads or to bend the terminals of the access port switch. Retain the hardware. Mark the positions of the leads and disconnect them.

step 13

Disconnect the ground wire on the right side of the

Type AT-12 control enclosure. See Figure 17.

I

leads may result in improper reconnection that will render the pad-mounted gear inoperative.

Step 14

Remove the four WL20X 1” hex-head zinc-plated cap screws, lo&washers, and flat washers at the top and bottom of the Type AT-12 control enclosure, which secure the control to the upper mounting bracket and to the lower-left and lower-right mounting brackets.

See Figure 18. Retain the hardware.

(d) Remove the lower-center access panel surrounding the Type AT-12 control faceplate, which is secured at the bottom by a l/4”--20X3/4” hex-head stainlesssteel cap screw, lockwasher, and flat washer. See

Figure 15. Retain the hardware.

(e) Proceed to Step 13.

Step 12

For pad-mounted gear models having an “R4”

supplement to the catalog number: Remove the switch operator vertical access panels from both the left-hand and right-hand sides of the low-voltage control compartment, using the following procedure.

(a) Remove the bolted cover labeled “Terminal Blocks” on each side. See Figure 16.

(b) The switch operator vertical access panel on each side of the low-voltage control compartment is secured by live W-20X W hex-head stainless-steel cap screws, lo&washers, and flat washers. See

Figure 16. Two wire leads are connected to the charging-shaft access port switch on the back of each panel. Remove the five screws and associated lockwashers and flat washers from each switch operator vertical access panel, taking care not to damage the wire leads or to bend the terminals of the access port switch. Retain the hardware.

Mark the positions of the leads and disconnect them.

step 15

Remove the lope AT-12 control from the low-voltage control compartment by sliding it forward, to the right, and out from behind the center channel.

Step 16

Insert the replacement Type AT-12 control into the right-hand side of the low-voltage control compartment. Slide it in, then to the left, and behind the center channel.

Step 17

Loosely attach the replacement Type AT-12 control to the upper mounting bracket and to the lower-left and lower-right mounting brackets using the four

W-20X 1” hex-head zinc-plated cap screws, lockwashers, and flat washers retained from Step 14. See

Figure 18. Slide the control forward, toward the center channel, as far as possible. Then securely tighten the screws.

leads may result in improper reconnection that will render the pad-mounted gear inoperative.

(c) Remove the lower-center access panel surrounding the Type AT-12 control faceplate, which is secured at the bottom by a I/“--20X3/4” hex-head stainlesssteel cap screw, lo&washer, and flat washer. See

Figure 16. Retain the hardware.

Figure 13. Hardware to be removed near center of switch operator access panel on pad-mounted gear models not furnished with optional decoupling feature.

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S&C ELECTRIC COMPANY

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Chicago

S&C ELECTRIC CANADA LTD.

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Toronto

INSTRUCTION SHEET 5 14-525

Page 17 of 24

January 31,1994

S&C

Type AT Source-Transfer Controls

1

Field Replacement

1 REPLACING TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued

Operator target indicates whether stored-energy operator is in switch-open or switch-closed position and whether quick-make, qui ck-break mechanism is charged or discharged

Remote-control receptacle

(Cataloa Number Suffix

‘;-cl I”)-

Open/close pushbuttons

\

Middle stationary door latch

\

%6”- 18X1” hex-head

zinc-plated cap screws and hex nuts

Upper stationary

Emergency-trip access cover

I

Charging shaft

Operation counter

/

Operation selector

I

Manual charging handle-

Switch-position * target

\

Vi’-20 x %” stainless-steel washers

Terminal-block compartment

/

/

Source-Transfer Control

Bottom stationary door latch

I

L p a n e l

Bottom switch operator access

Utility’tool used for emergency manual tripping and, if optional decoupling feature is furnished, for decoupling stored-energy operator from interrupter switch

Bolted cover provides access to the

AT-12 control’s programming panel

Decoupling indicator (furnished with optional decoupling feature)

Hinged cover provides access to reverse-drive hub and, if decoupling feature (Catalog

Number Suffix “XX”) is furnished, to decoupling sockets

Figure 14. Low-voltage control compartment of pad-mounted gear models having an “R3” supplement to the catalog

nUmDer

and horizontally split access panels.

5

14-525 INSTRUCTION SHEET

Page 18 of 24

January 31,1994

S&C ELECTRIC COMPANY

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S&C ELECTRIC CANADA LTD.

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Toronto

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REPLACING TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued

Operator target indicates whether stored-energy operator is in switch-open or switch-closed position and whether quick-make, quick-break mechanism is charged or discharged

\

a

bpenlclose pushbuttons

Emergency-trip access cover

/

I

/

I

%“-20x %” hex-head stainless-steel cap screws,

[ lockwashers, and flat washers

I

-Switch operator vertical access panel

I

Switch-position target

I

Terminal-block compartment

T/y pe AT-1 2

Source-Transfer Control

\

Bolted cover provides access to the

\ Lower-center access panel

AT-12 control’s programming panel

\

Decoupling indicator (furnished with optional decoupling feature)

Hinged cover provides access to reverse-drive hub and, if decoupling feature (Catalog

Number Suffix “-03”) is furnished, to decoupling sockets

\

Utility tool used for emergency manual tripping and, if optional decoupling feature is furnished, for decoupling stored-energy operator from interrupter switch

..- -.. _ . . . .

. .

igure 15. Low-voltage control compartment of pad-mounted gear models having an “R3” supplement to tne catalog numoer and vertically split access panels.

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s&C ELECTRIC

COMPANY l

Chicago

S&C ELECTRIC CANADA LTD.

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Toronto

INSTRUCTION SHEET 5 141525

Page 19 of 24

January 3l,lgg4

S&C Type AT Source-Transfer Controls

1 Field Replacement

1 REPLACING TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued

Operator target indicates whether stored-energy operator is in switch-open or switch-closed position and whether quick-make, quick-break mechanism is charged or discharged

,

Open/close pushbuttons

\

-control receptacle

Number Suffix

anual handle

%“-20X J/s” hex-head stainless-steel cap screws, lockwashers, and flat washers

Operation counter

Emergency-trip access cover

Switch operator vertical access

~~

\ Decoupler indicator

Type AT-1 2

Source-Transfer Control

\

Lower-center access panel

T&minal-block compartment

\

Bolted cover provides access to the

AT-12 control’s programming panel

Figure 16. Low-voltage control compartment of pad-mounted gear models having an “R4” supplement to the catalog number.

5 141525 INSTRUCTION SHEET

Page 20 of 24

January 31,1994

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REPLACING TYPE AT-12 SOURCE-TRANSFER CONTROL

-

Connect the ground wire to the right side

of

the replacement Type AT-12 control enclosure. See

Figure 17.

Step 18

For pad-mounted gear models having an "Rl" or

"R2" supplement to the catalog number, proceed to Step

19. For pad-mounted gear models having an "R3" supplement to the catalog number and horizontally split access panels

as

shown in Figure 14, proceed to

Step 20. For pad-mounted gear models having an "R3" supplement to the catalog number and vertically split access panels

as

shown in Figure 15, proceed to Step

21. For pad-mounted gear models having an "R4"

Step 19

models

hawing a n "R1 "or "R2"

supplement to the catalog number:

Replace the switch

I step

20

For pad-mounted gear models having an "R3" supplement to the catalog number and horizontally split

m e s s

panels as

shown

i n

Figure 14:

Replace the switch operator access panels on the left-hand and right-hand sides of the low-voltage control compart- ment, using the following procedure.

(at)

Reattach the bottom switch operator access panel on each side using the three or four '/4"-20X3/4" hex-head stainless-steel cap screws, lockwashers, and flat washers retained from Step 10. See

Figure 14. Be sure that the decoupling indicator and switch-position target are centered in their respective port openings.

(b)

lf the pad-mounted gear furnished with optimal decoupling feature (Catalog Number S u f f k V 8 ' 3 :

Reattach the hinged covers to the bottom switch following procedure.

(a) Reattach the bottom switch operator access panel on each side using the three

or

four 1Y4"-20X3/" hex-head stainless-steel cap screws, lockwashers, and flat washers retained from Step

9.

See

Figure 12. Be sure that the decoupling indicator and switch-position target are centered in their respective port openings.

Also

be sure to connect using the two W-20 X

W

round-head stainless- steel screws retained from Step 10. See Figure 7.

If the pad-mounted gear is not furnished with

optional &coupling feature:

Replace the two

W-20 X %" hex-head stainless-steel cap screws, lockwashers, and flat washers retained from Step

10, near the center of each bottom switch operator access panel. See Figure 13.

( e )

Loosely

reattacH the middle and bottom stationary door latches using the 5/16"-18X 1" hex-head zinc- utility tool

as

shown.

(b)

If

the pad-mounted gear

Reattach the hinged covers to the bottom switch

10. See Figure 14.

( d )

S h l y

close the right-hand door and observe the positions of the latching parts on the door relative to the stationary door latches. The 5/16-inch and

%inch clearances indicated

in

Figure 19 must be maintained. Readjust each stationary latch

as

using the two 1/i"-20 X %" round-head stainless- steel screws retained from Step 9. See Figure 7.

If

the pad-mounted gear

is

not furnished with optional decoupling feature:

Replace the two

~/4"-20X 'h" hex-head stainless-steel cap screws, lockwashers, and flat washers retained from Step

9,

near the center of each bottom switch operator access panel. See Figure 13.

(c) Replace the bolted cover labeled 'Terminal Blocks" on each side. See Figure 12.

(d)

Proceed to Step 23. torque the 5/16"-18X 1" hex-head zinc-plated cap screws to 24 to 28 foot-pounds.

( e )

Replace the bolted cover labeled "Terminal Blocks" on each side. See Figure 14.

( f) Proceed to Step 23.

S&C ELECTRIC COMPANY

S&C ELECTRIC CANADA LTD. Toronto January

Chicago Page 21

INSTRUCTION SHEET

of 24

31,1994

S&C Type AT Source-Transfer Controls

I

Field Replacement

REPLACING TYPE AT-12 SOURCE-TRANSFER CONTROL

-

Step 21

For

pad-mounted gear models having a n “R3” supplement to the catalog number and vertically split

access

panels as

operator vertical access panels on the left-hand and right-hand sides of the low-voltage control compart- ment, using the following procedure.

Replace the lower-center access panel surrounding t h e Type AT-12 control faceplate using the

W-20 X %“ hex-head stainless-steel cap screw,

(b) Reconnect the wire leads to the charging-shaft access port switch on the back of each switch operator access panel. Then reattach each access steel cap screws, lockwashers, and flat washers retained from Step 12. See Figure 16. Be sure that the emergency-trip shaft, operator target, switch- position target, and decoupler indicator are centered in their respective port openings.

Also

be sure to connect the chain for the dual-purpose manual handle as shown.

(e) Replace the bolted cover labeled ‘Terminal Blocks” on each side. See Figure 16.

I

See Figure 15.

Reconnect the wire leads to the charging-shaft access port switch on the back of each switch operator access panel. Then reattach each access panel using the five %-20 X

%‘‘

steel cap screws, lockwashers, and flat washers retained from Step 11. See Figure 15. Be sure that

Step 23

Set the timer adjustment dials and operating-mode selector switches on the programming panel

of

the replacement Type AT-12 control in accordance with the settings of the replaced control,

as

noted in Step 7. position target, and decoupling indicator are centered in their respective port openings.

Also

be

Step 24

on the replacement Type AT-12 control faceplate the “MANUAL” position. See Figure 6. in

decoupling feature

S u f l k ‘‘T8’1):

Reattach each hinged cover to the associated switch operator access panel by securing its hinge plate using the two ‘/4“-20X%“ round-head stainless-steel screws retained from Step 11. See

Figure 7.

If the p a d - m n t e d gear i s not furnished with optional decoupling feature:

Replace the two

‘/4”-20 X %” hex-head stainless-steel cap screws, lockwashers, and flat washers retained from Step

11, near the center access panel. See Figure 13.

Step 25

Connect the left-hand switch compartment plug and right-hand switch compartment plug to their recep- tacles on the programming panel of the replacement

Type AT-12 control. See Figure 9. Make sure that the

“preferred” and “alternate” settings are in accordance with the designations noted in

Step 6. If

the pad- mounted

gear

is furnished with optional remote-

’?:

Also connect the remote-indication output plug to its associated receptacle on the programming panel of the replacement Type AT-12 control.

Replace the bolted cover labeled ‘Terminal Blocks” on each side. See Figure 15.

Proceed to Step 23.

Step 26

Remove the input plug from the shorting receptacle and immediately transfer it to the input receptacle.

See Figure 9.

For

step 22

pad-mounted gear models having an

“R4”

supplement

to

the catalog number:

Replace the switch operator vertical access panels on the left-hand and right-hand sides

of

the low-voltage control compart- ment, using the following procedure. sensors and voltage limiters that w render the t h e Type AT-12 control faceplate using the

?4”-20 X

%” hex-head stainless-steel cap screw, lockwasher, and flat washer retained from Step

See Figure 16.

5

1

INSTRUCTION SHEET

January 31,1994

S&C ELECTRIC COMPANY

S&C ELECTRIC CANADA LTD.

Chicago

Toronto

REPLACING TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued

Figure 17. Disconnecting

Source-Transfer Control.

ground wire on Type AT-12

I

‘Ii’-20 x 1” hex-head zinc-plated cao screws.

lodkwashers, and flat washers

Upper mounting bracket.

Ground wire’

Lower-left mounting bracket

Figure 18. Removing Type AT-12 Source-Tnrnsfer Control.

Pad-mounted gear model having an “R2” supptemeut to the catalog number is illustrated.

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INSTRUCTION SHEET 5 141525

Page 23 of 24

January 3l,lgg4

x -

-

S&C Type AT Source-Transfer Controls

I

Step 27

Refer to Instruction Sheet 663-501 or 663-502, “S&C

Pad-Mounted Gear-Power-Operated

PMH

Models

(Operation and Adjustment)” or Instruction Sheet

667-551, “S&C Pad-Mounted Gear-Power-Operated

I

Field Replacement

REPLACING TYPE AT-I2 SOURCE-TRANSFER CONTROL

-

(b)

For each stored-energy operator, grasp the associated decoupler and turn it

clockwise

5

to

6 complete turns, until firm resistance is felt and the “COUPLED” target

is

centered in

the indicator port. See Figure 8.

I

the source-transfer control adjustment and program- ming procedures described therein. Then perform the

Step 31

Replace the bolted cover labeled “Source-Transfer

Control Switches and Timers.”

Step 28

After operational testing has been completed, again on the replacement Type AT-12 control faceplate in the “ M A N U A L ” position. See Figure

6.

Step 29

For

pad-mounted gear models having a n “Rl,

”

“R2,

’’

or “R3” supplement

to

the catalog number and furnished with optional decoupling feature (Catalog

Number Suffix “-C8’7:

Couple each stored-energy operator, using the following procedure.

(a)

Malce sure that the stored-energy operators are in the sume positions (open

or closed) as their associated Mini-Rupter Switches by observing the switch-position and operam-position targets.

If required, use the open/close pushbuttons (pro- vided control power is available) to reposition the operator(s).

(b) For each stored-energy operator, open the hinged tool furnished

the socket

to depress the spring-loaded locking pin. While maintaining the locking pin depressed, turn the utility tool

clockwise

5 to 7 complete turns, until firm resistance is felt and the “COUPLED” target

centered

in the indicator port.

is

7.

Remove the tool. Then close the hinged cover and secure it with the knurled screw.

(c) Proceed to Step 31.

Step

30

For

pad-mounted gear models having an

“R4” supplement

to

the catalog

number:

Couple each stored- energy operator, using the following procedure.

(a)

the same positions (open

or

closed)

as

their

associated Mini-Rupter Switches by observing the

switch-position and operator-position targets.

If required, use the open/close pushbuttons (pro- vided control power is available) to reposition the operator(s).

Step 32

Place the manual/automatic operation selector switch on the replacement Type AT-12 control in t h e

“AUTOMATIC” position and confirm that the automatic-transfer “ready” indicating lamp is lit.

step

33

compartment. Make sure that the doors to the high- voltage compartments are also closed and padlocked.

Bottom stationa

Figure 19. Clearances between latching parts on door and stationary door latches. Applicable to pad-mounted gear models having an “ R 3 supplement to the catalog number and horizontally split access panels.

5

1

INSTRUCTION SHEET

Page

24 of 24

January 31,1994

S&C ELECTRIC COMPANY

S&C

ELECTRIC CANADA LTD.

Chicago

Toronto