UPS 120, UPS 150, UPS 250, UPS 300, UPS 301, UPS 500, UPS 600, UPS 750 and UPS 900 Uninterruptible Power Supplies Caterpillar

Description

The Zig Zag Circut Breaker (CB2) is located on the left panel in 4-wire installations. The CB2 is located on the rear panel in 3-wire installations.

Removal Procedure 4-Wire

Illustration 1	g01269988
4-Wire Zig Zag Circuit Breaker Left Panel (1) Zig Zag Circuit Breaker

Refer to Systems Operation, Testing and Adjusting, RENR9988, "Internal Component Preremoval Steps (SMS Bypass Cabinet)" in order to shut down the system and gain access to internal components.

1. Record settings for the breaker.

2. Disconnect the cables from the Zig Zag Circuit Breaker (1). Verify the labeling of the cables for subsequent installation.

3. Remove the four screws that hold the breaker (1) to the left panel.

4. Remove wires from breaker (1).

5. Remove the CB2 (1) from the cabinet.

Removal Procedure 3-Wire

Illustration 2	g01269813
3-Wire Zig Zag Circuit Breaker Rear Panel (2) Zig Zag Circuit Breaker

Refer to Systems Operation, Testing and Adjusting, RENR9988, "Internal Component Preremoval Steps (SMS Bypass Cabinet)" in order to shut down the system and gain access to internal components.

1. Disconnect the wires from the CB2 (2). Verify the labeling of the wires for subsequent installation.

2. Remove the rail stop on the left side of the Zig Zag Circuit Breaker (2) by loosening the two screws and sliding the rail stop off the rail.

3. Remove the Zig Zag Circuit Breaker (2) by sliding the CB2 off the rail.

4-Wire Installation Procedure

1. Verify settings for the breaker.

2. Position the Zig Zag Circuit Breaker (1) in place on the left panel. Refer to Illustration 1 for placement.

3. Attach the wires to the breaker. Verify the labeling on the wires.

   Note: The wires must be attached to the breaker before the breaker is installed.

4. Attach the breaker (1) to the left panel with four screws.

5. Attach the cables to the Zig Zag Circuit Breaker (1). Verify the labeling of each cable as to each location of the cable.

3-Wire Installation Procedure

1. Attach the Zig Zag Circuit Breaker (2) onto the rail that is connected to the rear panel. Place the top of the breaker on the rail and then snap the bottom of the breaker into place. Refer to Illustration 2 for placement.

2. Attach the rail stop. Slide the rail stop over the rail from the left side. Install the rail stop with two screws.
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   Illustration 3	g01270004

3. Attach the wires to the Zig Zag Circuit Breaker (2). Verify the labeling of each wire with the placement of each wire. Refer to Illustration 3 for wire connections.