UPS 1000S/ UPS 1200S Uninterruptible Power Supplys Caterpillar

Illustration 1	g01342924
MOV Circuit Breaker, Rear Panel (1) MOV Surge Protector (2) MOV Circuit Breaker (K10) (3) Wire Terminal

The MOV Circuit Breaker (K10) is located on the back panel of the Input/Output cabinet beneath the input cable landings.

The MOV Circuit Breaker is a 480V 30A breaker that monitors input current and will trip if the MOV Surge Protector pulls more than 30A, thus protecting the MOV.

If the MOV Circuit Breaker trips, the breaker will send a signal to the General Purpose Interface Board on the J7 connector in the Static Switch cabinet. There is no action taken from this signal.

Removal

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

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Illustration 2	g01274320
Circuit Breaker, Top View

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Illustration 3	g01274323
MOV Circuit Breaker Attachment and Connections

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Illustration 4	g01274330
MOV Circuit Breaker Attachments

2. Disconnect wires leading to and from the circuit breaker.

   The locations of the wires are labeled. Verify the labels on the cables for subsequent reinstallation. The wires are removed by inserting, through the front of the breaker, a small flat head screwdriver and unscrewing the wire terminals located at the top and bottom of the breaker. Refer to Illustration 4.

3. Disconnect the two wires from the wire terminal above the breaker. Refer to Illustration 3.

4. Remove the four screws that secure the breaker to the rear of the cabinet.

   Refer to Illustration 4.

Installation

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Illustration 5	g01274330
MOV Circuit Breaker Attachments

1. Attach the MOV Circuit Breaker to the back of the cabinet in the position that is indicated in Illustration 1. Use four long cross tip screws to attach the circuit breaker, one at each corner. Refer to the locations of the screws in Illustration 4.

2. Connect the two violet and black wires coming from the back of the circuit breaker to the wire terminal above the breaker.

   Refer to Illustration 3.

3. Connect the wires coming from the MOV surge protector to the top of the breaker. Additionally, connect the wires coming from the cable landings to the bottom of the breaker. The wires locations have been labeled. Refer to Illustration 3 and the following steps.

4. Unscrew each cable connector screw, using a small flat head screwdriver, through the front of the breaker. Refer to Illustration 3.

5. Insert the wire into the following locations:
   • the top of the breaker or the bottom of the breaker

   • between the connector plates

6. Tighten the cable connector screws in order to hold the wires in place.