UPS 1000S/ UPS 1200S Uninterruptible Power Supplys Caterpillar

There are six Current Transformers that are located in the Static Switch Cabinet. There are three Input Current Transformers attached to the frame in the middle of the cabinet. There are three Output Current Transformers attached to the bus bars in the bottom of the cabinet.

Illustration 1	g01275701
(1) Input Current Transformer (x3)

Illustration 2	g01275710
(2) Output Current Transformer (x3)

The three Input Current Transformers surround the five cables coming from the output of each phase of the Line Static Switches. Refer to Illustration 1. The three Output Current Transformers surround the bus bars for current returning to the output side of the Input/ Output Cabinet to the left of the Static Switch cabinet. Refer to Illustration 2.

The Input Current Transformers are used to measure input current when the UPS is Online. When in the Bypass mode, there is no current flowing through the Input Current Transformers. Therefore, the UPS will display the current value flowing though the Output Current Transformer for both the Input and Output current measurements.

Removal - Input Current Transformer

1. Perform steps in the Systems Operation, Testing and Adjusting, "Internal Component Preremoval Steps (Static Switch Cabinet)" in order to de-energize the system and gain access to internal components.

2. Remove the two screws that hold the Input Current Transformer to the cabinet frame. Use a 178 mm (7/16 inch) socket.

3. Remove the two wires that connect to the right side of the Input Current Transformer.

   The cables locations are labeled.

   Note: Verify the labels.

4. Detach the five cables from the Line Static Switch output connector that run through the Input Current Transformer.

5. Slide the Current Transformer off the five cables.

Installation - Input Current Transformer

1. Insert the five cables for the Line Static Switch output through the hole in the Current Transformer.

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Illustration 3	g01271424
(60) Nut (61) Belleville Washer (62) Grade 8 Coated Steel Washer (63) Bus Bars (64) Bolt (65) Cable Lug

2. Attach each of the five cables to the output of the Line Static Switch with two bolts from the right side.

   Refer to Illustration 3 for hardware connections.

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Illustration 4	g01275739
Line STSW Current Transformer Wire Connections

3. Position the Current Transformer on the middle frame rail with the wire connections on the right side and the "H1" insignia facing up, as shown in Illustration 4.

4. Screw two bolts in the front two bolt holes to secure the Current Transformer to the cross-member. Use a 178 mm (7/16 inch) socket.

5. Attach the two wires to the right side of the Current Transformer. The colored wire connects to the "X1" post and the black wire connects to the "X2" post.

   Refer to Illustration 4.

6. Tighten the cable to static switch output nuts to 954 N·m (70 lb ft).

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

Removal - Output Current Transformer

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Illustration 5	g01275747

1. Perform steps in the Systems Operation, Testing and Adjusting, "Internal Component Preremoval Steps (Static Switch Cabinet)" in order to de-energize the system and gain access to internal components.

   Note: Removal of the Phase A or Phase C Output Current Transformer requires that the Phase B Output Current Transformer is removed first.

   Refer to Illustration 5 .

2. Detach the two wires from the "X1" and "X2" poles on the top edge of the Output Current Transformer. The wires locations are labeled. Verify the wire labels.

3. Remove the two bolts that connect the Output Current Transformer to the cabinet bottom panel. Use a 178 mm (7/16 inch) socket.

4. Detach the six cables that are connected to the bus bars to the left of the Output Current Transformer.

5. Slide the Output Current Transformer off the bus bar to the left side.

Installation- Output Current Transformer

Note: Installation of the Phase B Output Current Transformer requires that the Phase A and Phase C Output Current Transformers is installed first. Refer to Illustration 5 .

1. Slide the Output Current Transformer onto the bus bar from the left side with wire posts oriented facing up and to the back of the cabinet, and the "H1" insignia facing to the right of the cabinet. Refer to Illustration 5 for positioning.

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Illustration 6	g01275788

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Illustration 7	g01275794
(60) Nut (61) Belleville Washer (62) Grade 8 Coated Steel Washer (63) Bus Bars (64) Bolt (65) Cable Lug

2. Attach the six cables coming from the Input/Output Cabinet to the bus bars using two bolts each from the bottom side of the bus bars. Refer to Illustration 6 for cable connections and Illustration 7 for bolt hardware installation.

3. Attach the Output Current Transformer to the cabinet frame with two bolts through the bottom two holes of the Current Transformer. Use a 178 mm (7/16 inch) socket.

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Illustration 8	g01275775

4. Attach the two wires to the "X1" and "X2" poles on the top edge of the Current Transformer. The wires locations are labeled. The colored wire to the "X1" pole. The black wire to the "X2" pole. Refer to Illustration 8.

5. Tighten the cable to bus bars nuts to 954 N·m (70 lb ft).

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