UPS 1000S/ UPS 1200S Uninterruptible Power Supplys Caterpillar

Illustration 1	g01345055
Static Switch Left Panel (1) Fan Fuses F1-F3 (2) Fuse Block F23, F24 (3) Zig-Zag Circuit Breaker K13 (4) Zig-Zag Overload Relay K11 (5) Zig-Zag Transformer

The Zig-Zag Overload Relay (K11) is mounted on the lower left panel. The Zig-Zag Overload Relay is required for maintaining the ground reference of the UPS 3-phase output when the system is in discharge mode and disconnected from the utility input.

Removal

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. Disconnect the wires from the Zig-Zag Overload Relay. The labels on the wires indicate the location for the wire. Verify the labels on the wires.

3. Remove the rail stop on the right side of the Zig-Zag Overload Relay by loosening the two screws. Slide the rail stop off the rail.

4. Remove the Zig-Zag Overload Relay by sliding the Zig-Zag Overload Relay off the rail.

Installation

1. Attach the Zig-Zag Overload Relay onto the rail.

   Refer to Illustration 1 for placement.

   1. Place the top of the Relay on the top edge of the rail.

   2. Snap the bottom of the relay into place.

2. Attach the rail stop by sliding the rail stop over the rail from the right side. Tighten the two screws.

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Illustration 2	g01275667

3. Attach the wires to the Zig-Zag Overload Relay.

   The labels on the wires indicate the location for the wire.

   Refer to Illustration 2 for wire connections.