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

Description

Illustration 1	g01273727
Location of Primary Current Transformers (1) Primary Current Transformers

Illustration 2	g01273731
Location of Secondary Current Transformers (2) Secondary Current Transformers

Primary Current Transformers (1) are attached to the output of the System cabinet in order to measure the output voltage of the UPS. The Primary Current Transformers (1) convert the current in a 1500:5 ratio. The converted current is sent to the secondary current transformers (2) on the left panel.

The three secondary current transformers (2) are located on the left panel. The secondary current transformers (2) convert the current in a 5:01 ratio. The converted current is sent to the AC Interface board.

Removal Procedure and Installation Procedure for the Primary Current Transformer

Note: Call technical support for the removal procedure and the installation procedure of the primary current transformer (1).

Illustration 3	g01273730
Top View of the Location for the bus bar of the Primary Current Transformer

Illustration 4	g01273745
Wire Connections for the Primary Current Transformer

Removal Procedure for the Secondary Current Transformer

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

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Illustration 5	g01273757
Wire Connections for the Secondary Current Transformer

1. Remove the four wires that connect the following posts of the current transformer (2): "H1", "H2", "X1" and "X2". The wires have a labeling to the location of the wire. Verify the labeling of the wire with the location of the wire. Refer to Illustration 5.

2. Remove the four screws that attach the current transformer (2) to the left panel.

3. Remove the current transformer (2) from the cabinet.

Installation Procedure for the Secondary Current Transformer

1. Position the current transformer (2) on the left panel. Refer to Illustration 2 for the position of the current transformer (2).

2. Attach the current transformer (2) to the left panel with four screws.

3. Attach the four wires to the four posts of the current transformer. Refer to Illustration 5 for wire connections.