UPS 1000S/ UPS 1200S Uninterruptible Power Supplys Caterpillar

Illustration 1	g01325217
4-Wire Output Cabinet Components (1) Capacitors (2) Ground (3) Right Panel (4) K8 Circuit Breaker

There are five tin-coated copper output cable landings in the 4-Wire Output Cabinet:

• one for each phase of the three-phase output power

• one for the neutral connection

• one for the ground

Refer to Illustration 1 for cable landing locations.

The input cable landings are designed to accommodate 500 kcmil cable to 750 kcmil cable.

The installer will punch the appropriate hole pattern for trade size conduit depending on the size and number of input cables.

Cable Landing Phase Bar Removal

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When servicing or repairing electric power generation equipment: Make sure the unit is either locked out or tagged DO NOT OPERATE. Remove all fuses. Make sure the generator engine is stopped. Make sure all batteries are disconnected. Make sure all capacitors are discharged. Make sure residual voltage in the rotor, stator and the generator is discharged. Failure to do so could result in personal injury or death.

1. Perform steps that are listed in Systems Operation, Testing and Adjusting, "Internal Component Preremoval Steps (4 Wire Output Cabinet)" in order to complete the following tasks:
   • de-energize the system

   • gain access to internal components

2. Disconnect the utility input cables from the cable landing.

3. Remove the capacitor banks that are located at the back of the cable landing.

   Refer to Systems Operation, Testing and Adjusting, "Capacitor (4 Wire Output Cabinet)".

4. Unscrew the back three bolts that connect the landing to the cabinet.

5. Unscrew the front three bolts that connect the landing to the vertical bus bar leading into the circuit breaker.

6. Remove the cable landing.

Cable Landing Phase Bar Installation

1. Place the cable landing in position.

   Refer to Illustration 1.

2. Attach the front of the landing to the bus bar that extends vertically from the top of the circuit breaker by inserting three bolts from the back side.

   Note: Circuit Breaker (K8) is an option. Therefore, the Circuit Breaker (K8) may not be present.

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Illustration 2	g01325218
(5) Nut (6) Belleville Washer (7) Grade 8 Coated Steel Washer (8) Bus Bars (9) Bolt

3. Attach washers and nuts in the order that is indicated in Illustration 2.

   Note: In all cases, the side of the belleville washer that curves inward should be placed facing the bus bar.

4. Insert three bolts at the back of the cable landing. Place bolt and steel washer through the cable landing, a red insulating spacer and into the threaded Huck rivets at the back of the cabinet.

5. Attach the capacitor banks that are located at the back of the cable landing.

   Refer to Systems Operation, Testing and Adjusting, "Capacitor (4 Wire Output Cabinet)".

6. Attach the utility output cables to the bus bar.

7. Tighten all bus bar hex nuts to 150 N·m (110 lb ft).

8. Tighten utility input cable hex nuts to appropriate specifications.

   Note: Always tighten the hex nut, not the bolt.

Cable Landing Ground Bar Removal

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When servicing or repairing electric power generation equipment: Make sure the unit is either locked out or tagged DO NOT OPERATE. Remove all fuses. Make sure the generator engine is stopped. Make sure all batteries are disconnected. Make sure all capacitors are discharged. Make sure residual voltage in the rotor, stator and the generator is discharged. Failure to do so could result in personal injury or death.

1. Perform the steps that are listed in Systems Operation, Testing and Adjusting, "Internal Component Preremoval Steps (4 Wire Output Cabinet)" in order to de-energize the system and gain access to internal components.

2. Disconnect the utility output cables from the ground cable landing that is located at the top, back panel of the cabinet.

3. Unscrew the four bolts that connect the landing to the cabinet frame.

4. Remove the cable landing.

Cable Landing Ground Bar Installation

1. Place the ground cable landing in position at the top of the rear panel in the cabinet.

   Refer to Illustration 1.

2. Attach the landing to the rear of the cabinet by inserting four bolts, each with one grade 8 coated steel washer.

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Illustration 3	g01325222
(10) Nut (11) Belleville Washer (12) Grade 8 Coated Steel Washer (13) Bus Bars (14) Bolt (15) Cable Lug

3. Attach the utility input ground cables to the bus bar.

   Refer to Illustration 3.

   Note: In all cases, the side of the belleville washer that curves inward should be placed facing the bus bar.

4. Tighten all ground bus bar bolts to 150 N·m (110 lb ft).

   Note: Always tighten the hex nut, not the bolt.

5. Tighten the input ground cable hex nuts to appropriate specifications.