INSTRUCTIONS I INTRODUCTION I TABLE OF CONTENTS. %!kc TypeAT-2,TypeAT-3,orTypeAT-12Source- S8C Type AT Source-Transfer Controls I Field Replacement

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1 S8C Type AT Source-Transfer Controls Field Replacement NSTRUCTONS TABLE OF CONTENTS Section Page Number Section Page Number NTRODUCTON... 1 RE LACNG TYPE AT-2 SOURCE-TRANSFER CONTROL N REPLACNG TYPE AT-2 OR TYPE AT-3 SOURCE-TRANSFER WEATHERPROOF ENCLOSURE APPLCATON....7 CONTROL N METALENCLOSED SWTCHGEAR RE LACNG TYPE AT-12 SOURCE-TRANSFER CONTROL NTRODUCTON 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 in safety procedures for this type of equipment. This publication provides instructions for replacing an %!kc TypeAT-2,TypeAT-3,orTypeAT-12Source- Transfer Control, when such replacement is indicated i n 1 nstruction Sheet , S&C TypeAT Source- Transfer Controls: Troubleshooting Guide. New NSTRUCTON SHEET COMPANY ELECTRC S&C Chicago Page 1 of 24 CANADA ELECTRC S&C LTD. January 0 Toronto 31,1994

2 Sac Type AT Source-Transfer Controls Field Replacement REPLACNG TYPE AT-2 OR TYPE AT-3 SOURCE-TRANSFER CONTROL N METAL-ENCLOSED SWTCHGEAR step 1 step 3 Place the manual/automatic operation selector switch Loosen the screw fastener and draw out the Type AT on the Type AT control faceplate in the MANLJAL control from the switchgear-bay stile, until the latch position. See Figure 1. at the rear of the control locks. See Figure 2. step 2 Decouple the Type MS-2 or Type AS-30 Switch Operators. Refer to the S&C instruction sheet furnished for the switch operators NSTRUCTON SHEET COMPANY ELECTRC 2 S&C Page of 24 January 31,1994 CANADA ELECTRC S&C Chicago LTD. Toronto

3 REPLACNG TYPE AT-2 OR TYPE AT-3 SOURCE-TRANSFER CONTROL N METAL-ENCLOSED SWTCHGEAR - Continued 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-2 Control Type AT-3 Control Figure 1. Front-panel features of S&C Type AT-2 and Type AT-3 Source-Transfer Controls. s&c ELECTRC COMPANY Chicago S&C ELECTRC CANADA LTD. Toronto NSTRUCTON SHEET 5 1 d-525 Page 3 of 24 January 31,1994

4 S&C Type AT Source-Transfer Controls 1 Field Replacement REPLACNG TYPE AT-2 OR TYPE AT-3 SOURCE-TRANSFER CONTROL 1 N METAL-ENCLOSED SWTCHGEAR - Continued 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. 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. 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. f thecontrol isfurnished with optional remote-indication feature (Catalog Number Suffix -Al ): Also remove the remoteindication output plug from its associated receptacle on the programming panel. 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 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. step 12 Place the manual/automatic operation selector switch on the replacement Type AT control faceplate in the MANUAL position. See Figure 1. 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. f the control is furnished with optional remoteindicationfeature (Catalog NumberSuflix -Al ): Also connect the remote-indication output plug to its associated receptacle on the programming panel of the replacement Type AT control. Telescoping support raiir 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. i -20 x 12 hex-head stainless-steel cap screws and lockwashers Figure 2. Type AT control in drawout position NSTRUCTON SHEET Page 4 of 24 Janbarv S&C ELECTRC COMPANY Chicago - S&C ELECTRC CANADA LTD. Toronto i

5 REPLACNG TYPE AT-2 OR TYPE AT-3 SOURCE-TRANSFER CONTROL N METAL-ENCLOSED SWTCHGEAR - Continued Voltage-sensor signaladjustment screws and test Voltage-sensor signal adjustments jacks Timer-adjustment and measurements 7 dials on Type AT-3 Controls Catalog - Numbers nput plug (signal-voltage, and control-voltage, and currentsensing input circuits) \ Timer-adjustment dials Shorting receptacle, nput 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. 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) Fuseholder and test jack arrangement \ on Type AT-2 Control Catalog Number and Type AT-3 Control Catalog Number 38891, for use with three voltage transformers per source V Left-hand entrance bay and right-hand entrance bay plugs Rehote-indication receptacle provided with optional remoteindication feature (Catalog Number Suffix -Al ) ^.. -..~ 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 ndoor Voltage Sensors and one voltage transformer per source. nsets show construction differences on other models. m s&c ELECTRC COMPANY Chicago S&C ELECTRC CANADA LTD. Toronto NSTRUCTON SHEET Page 5 of 24 January 31,1994

6 S&C Type AT Source-Transfer Controls 1 Field Replacement REPLACNG TYPE AT-2 OR TYPE AT-3 SOURCE-TRANSFER CONTROL N METAL-ENCLOSED SWTCHGEAR - Continued step 14 Remove the input plug from the shorting receptacle and immediately transfer it to the input receptacle. See Figure 3. 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 15 Refer to nstruction Sheet , S&C Source- Transfer Controls-Type AT-2: For Two-Way Transfer, Catalog Numbers and or nstruction Sheet , S&C Source-Transfer Controls-Type AT-3: For Two-Way Transfer with Bus-Tie Switch, Catalog Numbers and and perform the procedures described therein in the ADJUSTMENTS AND PROGRAMMNG section. Then perform the procedures described therein in the OPERATONAL TESTNG (EXERCSNG) section. 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 AUTOMATC 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 NSTRUCTON SHEET Page 6 of 24 January 31,1994 S&C ELECTRC COMPANY Chicago S&C ELECTRC CANADA LTD. Toronto

7 REPLACNG TYPE AT-2 SOURCE-TRANSFER C6NTROL N WEATHERPROOF ENCLOSURE APPLCATON Step 1 Place the manual/automatic operation selector switch on the Type AT-2 control in the MANUAL position. See Figure 5. Step 2 Decouple the Type AS-1A or Type AS-10 Switch Operators. Refer to the 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 replacement control can be set accordingly. f the control is furnished with optional remoteindication feature (CatubgNumberSuff.irr: -A1 T):Also remove the remote-indication output plug from its associated receptacle. step 5 Make note of the timer-adjustment dial settings, as well as the settings of the operating-mode selector switches, so that the replacement control can be set accordingly. 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 the control to weatherproof enclosure. See Figure 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. NSTRUCTON SHEET 5 1 4=525 COMPANY ELECTRC S&C Page Chicago 7 of 24 D. CANADA ELECTRC S&C January Toronto 31,1994

8 SBC Type AT Source-Transfer Controls Field Replacement REPLACNG TYPE AT-2 SOURCE-TRANSFER CONTROL N WEATHERPROOF ENCLOSURE APPLCATON - Continued 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 selector switches on the replacement Type AT-2 control in accordance with the settings of the replaced control, as noted in Step 5. Step 11 Place the manual/automatic operation selector switch 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 their receptacles on the replacement Type AT-2 control. See Figure 5. Make sure that the preferred and alternate source settings are in accordance with the designations noted in Step 4. f the control isfumzished with optional remote-indication feature (Catalog Number Suffix -A1 9: Also connect the remoteindication output plug to its associated receptacle on the replacement Type AT control. Step 13 Replace the voltage-transformer secondary fuses and grounding circuit slugs. See Figure 5. step 14 Refer to nstruction Sheet , S&C Source- Transfer Controls--Type AT-2: n Weatherproof Enclosures and perform the procedures described therein in the ADJUSTMENTS AND PROGRAMMNG section. Then perform the procedures described therein in the OPERATONAL TESTNG section. Step 15 After operational testing has been completed, again place the manual/automatic operation selector switch on the replacement Type AT-2 control in the MANUAL position. See Figure 5. Step 16 Couple the Type AS-1A or Type AS-10 Switch Operators. Refer to the S&C instruction sheet furnished for the switch operators. Step 17 Place the manual/automatic operation selector switch on the replacement Type AT-2 control in the AUTO- MATC position and confirm that the automatictransfer ready indicating lamp is illuminated. 5 1 &525 NSTRUCTON SHEET COMPANY ELECTRC S&C Page 8 of 24 January 31,1994 LTD. CANADA ELECTRC S&C Chicago Toronto

9 REPLACNG TYPE AT-2 SOURCE-TRANSFER CONTROL N WEATHERPROOF ENCLOSURE APPLCATON - 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 overcurrent condition 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) B Source-voltage indicating lamps Automatic-transfer ready indicating lamp Fuseholders for signal-voltage and grounding circuits \ \ Ground wire Selector switch (furnished when open-phase detection feature- Catalog Number Suffix -Ll -is included) 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 n wearnerproor enclosure. m s&c ELECTRC COMPANY Chicago S&C ELECTRC CANADA LTD. Toronto NSTRUCTON SHEET Page g of 24 January 3l,lgg4

10 S&C Type AT Source-Transfer Controls Field Replacement REPLACNG TYPE AT-2 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 transfer it to the shorting receptacle. See Figure 9. step 1 Open the doors to low-voltage the control compartment and secure them with the door holders. step 2 Place the manual/automatic operation selector switch on the Type AT-12 control faceplate in the MANUAL position. See Figure 6. step 3 For pad-mounted gear models having an Rl, R2, 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. For each stored-energy operator, open the hinged cover labeled Decoupling Socket. nsert 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. Failure to immediately place the input plug on the shorting receptacle may result in damage to the voltage sensors and voltage limiters that wil render This procedure short-circuits and isolates the secondaries of the voltage sensors and also isolates the current sensors utilized with the optional overcurrentlockout feature (Catalog Number Suffi -Y2 or -Y3 ), 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, so that the replacement control can be set accordingly. fthe pad-mounted is furnished with 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 operating-mode selector switches on the programming panel, so that the replacement control can be set accordingly. See Figure 9. 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 &525 NSTRUCTON SHEET Page 10 of 24 S&C ELECTRC COMPANY Chicago January S&C 31,1994 ELECTRC LTD. CANADA Toronto

11 REPLACNG 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 ndicating lamp Figure 6. S&C Type AT-12 Source-Transfer Control taceplare. s&c ELECTRC COMPANY Chicago S&C ELECTRC CANADA LTD. Toronto NSTRUCTON SHEET 5 l&525 Page 11 of 24 January 3l,lgg4

12 S&C Type AT Source-Transfer Controls 1 Field Replacement REPLACNG TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued Decoupling socket Decoupling indicator l4-20 x % round-head stainless-steel screws (2) Utility tool -rotate 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 Page 12 of 24 January 31,19Q4 NSTRUCTON SHEET S&C ELECTRC COMPANY Chicago s&c ELECTRC CANADA LTD. * Toronto

13 REPLACNG TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued Timer-adjustment dials Voltage-sensor signal adjustments and measurements for - preferred and alternate sources Remote-indication receptacle (not visible) provided with optional remote-indication feature (Catalog Number Suffix -Y4 ) Voltage-sensor signaladjustment screws and test - jacks 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 / Selector switch included with the optional open-phase detection feature (Catalog Number Suffix -Yl or -Y3 ) Operating-mode selector switches for return transfer Preferred-source and alternate-source connector plugs-interchangeable, to allow selection of either source as preferred nput plug (signal-voltage, - control-voltage, and currentsensing input circuits). 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. NSTRUCTON SHEET 5 1 a-525 lm S&C ELECTRlC COMPANY Chicago Page 13 of 24 S&C ELECTRC CANADA LTD. Toronto January 31,1994

14 S&C Type AT Source-Transfer Controls 1 Field Replacement 1 REPLACNG 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 mechanism using the dual-purpose manual handle 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. Utility toolturn 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 NSTRUCTON SHEET Page 14 of 24 January 31,1994 S&C ELECTRC COMPANY Chicago * S&C ELECTRC CANADA LTD. Toronto i

15 REPLACNG TYPE AT-2 SOURCE-TRANSFER CONTROL - Continued Step 9 Fm pad-mounted gear models having an Ri 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 compartment, using the following procedure. (a) Remove the bolted cover labeled Terminal Blocks on each side. See Figure 12. (b) f the pad-mounted gear is furnished with optional decoupling feature (Catalog NumberSuffKx -C8 3: Open the hinged cover labeled Decoupling Socket on each side and mark the position of each hinge plate on its associated bottom switch operator access panel, to facilitate reassembly. See Figure 7. Remove the two W-20 X M round-head stainlesssteel screws that secure each hinge plate to its associated bottom switch operator access panel. Retain the hardware. fl 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 center of each bottom switch operator access panel. See Figure 13. Retain the hardware. (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 shown in Rgure 14: Remove the 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 zincplated cap screws and hex nuts that secure the latches in place. See Figure 14. Retain the hardware. (d) f the pad-mounted gear is furnished with optional decoupling feature (Catalog Number Suflk -C8 9: Open the hinged cover labeled Decoupling Socket on each side and mark the position of each hinge plate on its associated bottom switch operator access panel, to facilitate reassembly. See Figure 7. Remove the two /4-20X % round-head stainlesssteel screws that secure each hinge plate to its associated bottom switch operator access panel. Retain the hardware. f 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. 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. step 11 For pad-mounted gear models having an R3 supplement to the catalog number and vertically split access panels as shown in igure 15: 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 15. (b) f 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 access panel, to facilitate reassembly. See Figure 7. Remove the two % -20X % round-head stainlesssteel screws that secure each hinge plate to its associated switch operator vertical access panel. Retain the hardware. f the pad-mounted gear is not furnished with optional decoupling feature: Remove the two % -20 X?hn 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 NSTRUCTON SHEET ELECTRC S&C COMPANY Page Chicago 15 of 24 LTD. S&C CANADA ELECTRC January Toronto 31,1994

16 S&C Type AT Source-Transfer Controls 1 Field ReDlacement -r--- REPLACNG 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 Charging shaft Remote-control receptacle (Catalog Number Suffix Operation selector Top switch operator access panel % -20 x J/4 hex-head stainless-steel cap screws, lockwashers, and flat washers \ Bottom switch operator access panel Termin~l-block compartment Switch-position target Hinged cover provides access to reverse-drive hub and, if decoupling feature (Catalog Number Suffix -C8 ) is furnished, to decoupling sockets Type AT-1 2 Source-Transfer Control \ Bolted cover provides access to the AT-12 control s programming panel Utility tool used for emergency manual tripping and, if optional decoupling feature is furnished, for decoupling stored-energy operator from interrupter switch Decoupling indicator (furnished with optional decoupling feature) lure 12. Low-voltage control compartment of pad-mounted gear models having an Rl,, or --nz supplement O me catalog 5 l&525 NSTRUCTON SHEET Page 16 of 24 January 31,1994 S&C ELECTRC COMPANY Chicago * S&C ELECTRC CANADA LTD. Toronto

17 REPLACNG 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. leads may result in improper reconnection that will render the pad-mounted gear inoperative. step 13 Disconnect the ground wire on the right side of the Type AT-12 control enclosure. See Figure 17. 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 nsert 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 / --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. S&C ELECTRC COMPANY Chicago S&C ELECTRC CANADA LTD. Toronto NSTRUCTON SHEET Page 17 of 24 January 31,1994

18 S&C Type AT Source-Transfer Controls 1 Field Replacement 1 REPLACNG 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 Remote-control receptacle (Cataloa Number Suffix ;-cl )- %6-18X1 hex-head zinc-plated cap screws and hex nuts Upper stationary Emergency-trip access cover Charging shaft Open/close pushbuttons \ Middle stationary door latch \ Operation counter Operation / selector Manual charging handle- \ Vi -20 x % stainless-steel Switch-position * target washers Terminal-block / compartment / Source-Transfer Control Bolted cover provides access to the AT-12 control s programming panel Bottom stationary door latch Bottom switch operator access L panel Utility tool used for emergency manual tripping and, if optional decoupling feature is furnished, for decoupling stored-energy operator from interrupter switch Hinged cover provides access to reverse-drive hub and, if decoupling feature (Catalog Number Suffix XX ) is furnished, to decoupling sockets Decoupling indicator (furnished with optional decoupling feature) Figure 14. Low-voltage control compartment of pad-mounted gear models having an R3 supplement to the catalog numder and horizontally split access panels NSTRUCTON SHEET Page 18 of 24 January 31,1994 S&C ELECTRC COMPANY Chicago * S&C ELECTRC CANADA LTD. Toronto

19 REPLACNG 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 \ Emergency-trip access cover / abpenlclose pushbuttons % -20x % hex-head stainless-steel / cap screws, [ lockwashers, and flat washers -Switch operator vertical access panel Switch-position target Terminal-block compartment Hinged cover provides access to reverse-drive hub and, if decoupling feature (Catalog Number Suffix -03 ) is furnished, to decoupling sockets T/y pe AT-1 2 Source-Transfer Control \ Bolted cover provides access to the AT-12 control s programming panel \ Lower-center access panel Decoupling indicator (furnished with optional decoupling feature) \ \ 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. s&c ELECTRC Chicago S&C ELECTRC CANADA LTD. Toronto NSTRUCTON SHEET Page 19 of 24 January 3l,lgg4

20 S&C Type AT Source-Transfer Controls 1 Field Replacement 1 REPLACNG 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, % -20X J/s hex-head stainless-steel cap screws, lockwashers, and flat washers Open/close pushbuttons \ -control receptacle Number Suffix anual handle 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 NSTRUCTON SHEET Page 20 of 24 January 31,1994 S&C ELECTRC COMPANY Chicago S&C ELECTRC CANADA LTD. Toronto

21 REPLACNG TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued Step 18 Connect the ground wire to the right side of the replacement Type AT-12 control enclosure. See Figure 17. 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" supplement to the catalog number, proceed to Step 22. Step 19 For pad-mounted gear models hawing an "R1"or "R2" supplement to the catalog number: Replace the switch operator access panels on the left-hand and right-hand sides of the low-voltage control compartment, using the 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 the chains for the manual charging handle and the utility tool as shown. (b) f the pad-mounted gear is furnished with optional decoupling feature {Catalog Number Su.2~ "T8'3: Reattach the hinged covers to the bottom switch operator access panels by securing each hinge plate using the two 1/i"-20 X %" round-head stainlesssteel screws retained from Step 9. See Figure 7. f 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. step 20 For pad-mounted gear models having an "R3" supplement to the catalog number and horizontally split mess panels as shown in Figure 14: Replace the switch operator access panels on the left-hand and right-hand sides of the low-voltage control compartment, 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 is furnished with optimal decoupling feature (Catalog Number Suffk V8'3: Reattach the hinged covers to the bottom switch operator access panels by securing eac hinge plate using the two W-20 X W round-head stainlesssteel screws retained from Step 10. See Figure 7. f 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 zincplated cap screws and hex nuts retained from Step 10. See Figure 14. (d) Shly 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 necessary until these clearances are achieved. Then 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. NSTRUCTON SHEET S&C COMPANY ELECTRC 21 Page Chicago of 24 LTD. S&C CANADA ELECTRC January Toronto 31,1994

22 S&C Type AT Source-Transfer Controls Field Replacement REPLACNG TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued Step 21 For pad-mounted gear models having an R3 supplement to the catalog number and vertically split access panels as shown. in Figure 15: Replace the switch operator vertical access panels on the left-hand and right-hand sides of the low-voltage control compartment, using the following procedure. Replace the lower-center access panel surrounding the Type AT-12 control faceplate using the W-20 X % hex-head stainless-steel cap screw, lockwasher, and flat washer retained from Step 11. 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 % hex-head stainlesssteel cap screws, lockwashers, and flat washers retained from Step 11. See Figure 15. Be sure that the emergency-trip shaft, operator target, switchposition target, and decoupling indicator are centered in their respective port openings. Also be sure to connect the chains for the manual charging handle and the utility tool as pad-mounted gear is furnished with optional decoupling feature (Catalog Number Suflk 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. f the pad-mnted gear is 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 of each switch operator vertical access panel. See Figure 13. Replace the bolted cover labeled Terminal Blocks on each side. See Figure 15. Proceed to Step 23. step 22 For 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 compartment, using the following procedure. (a) Replace the lower-center access panel surrounding the Type AT-12 control faceplate using the?4-20 X % hex-head stainless-steel cap screw, lockwasher, and flat washer retained from Step 12. See Figure 16. (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 panel using the five 1/4-20X3h hex-head stainlesssteel cap screws, lockwashers, and flat washers retained from Step 12. See Figure 16. Be sure that the emergency-trip shaft, operator target, switchposition 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. 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. Step 24 Place the manual/automatic operation selector switch on the replacement TypeAT-12 control faceplate in the MANUAL position. See Figure 6. Step 25 Connect the left-hand switch compartment plug and right-hand switch compartment plug to their receptacles 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. f the padmounted gear is furnished with optional remoteindication feature (Catalog Number Suflk -A1?: Also connecthe remote-indication output plug to its associated receptacle on the programming panel of the replacement Type AT-12 control. Step 26 Remove the input plug from the shorting receptacle and immediately transfer it to the input receptacle. See Figure 9. input receptacle may result in damage to the voltage sensors and voltage limiters that wil render the 5 1 &525 NSTRUCTON SHEET Page 22 of 24 January 31,1994 COMPANY ELECTRC S&C S&C ELECTRC LTD. CANADA Chicago Toronto

23 REPLACNG TYPE AT-12 SOURCE-TRANSFER CONTROL - Continued Figure 17. Disconnecting Source-Transfer Control. ground wire on Type AT-12 i -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. NSTRUCTON SHEET S&C ELECTRC COMPANY Chicago Page 23 of 24 S&C ELECTRC CANADA LTD. Toronto January 3l,lgg4

24 x- - S&C Type AT Source-Transfer Controls Field Replacement REPLACNG TYPE AT-2 SOURCE-TRANSFER CONTROL - Continued Step 27 Refer to nstruction Sheet or , S&C Pad-Mounted Gear-Power-Operated PMH Models (Operation and Adjustment) or nstruction Sheet , S&C Pad-Mounted Gear-Power-Operated PMU Models (Operation and Adjustment) perform and the source-transfer control adjustment and programming procedures described therein. Then perform the operational testing procedures described therein. (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. Step 31 Replace the bolted cover labeled Source-Transfer Control Switches and Timers. Step 28 After operational testing has been completed, again place the manual/automatic operation selector switch on the replacement TypeAT-12 control faceplate in the MANUAL position. See Figure 6. Step 29 For pad-mounted gear models having an 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. f required, use the open/close pushbuttons (provided control power is available) to reposition the operator(s). (b) For each stored-energy operator, open the hinged cover labeled Decoupling Socket. nsert the utility tool furnished all the way into 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 is centered in the indicator port. See Figure 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 storedenergy operator, using the following procedure. (a) Make sure that the storedenergg operators are in the same positions (open or closed) as their associated Mini-Rupter Switches by observing the switch-position and operator-position targets. f required, use the open/close pushbuttons (provided 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 the AUTOMATC position and confirm that the automatic-transfer ready indicating lamp is lit. step 33 Close and padlock the doors to the low-voltage control compartment. Make sure that the doors to the highvoltage 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 R3 supplement to the catalog number and horizontally split access panels =525 NSTRUCTON SHEET Page 24 of 24 January 31,1994 S&C COMPANY ELECTRC LTD. S&C CANADA ELECTRC Chicago Toronto