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


AC Interface PWA (MMS System Cabinet)

Usage:

UPS 250 APZ

Description



Illustration 1g01273197
(1) AC Interface Board

The AC Interface Board (ACI) (1) monitors the voltages that are on the following nodes:

  • System Output

  • System Bypass

  • System Input

The ACI (1) also monitors the bypass currents of the system output.

Removal Procedure

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.



    Illustration 2g01273196
    Diagram of the Board for the AC Interface Board

  1. Disconnect all connectors. Refer to Illustration 2. Verify each labeling on the connector with the location of the wire. Verify each label on each connector.

  2. Disconnect the ten white plastic standoffs that connect the board (1) to the left panel.

    Note: The board (1) must be removed from the standoffs without bending the board (1).

Installation Procedure

  1. Position the board (1) in the cabinet over the ten white standoffs that are connected to the left panel.

  2. Push the board (1) onto all the standoffs simultaneously. Verify that all standoffs are locked in place.

  3. Connect the wire connectors into the correct connectors on the board (1). Check the labels on each connector for proper placement. Refer to Illustration 2.

  4. Calibrate the AC Interface Board. Refer to Systems Operation, Testing and Adjusting, RENR9988, "System Voltage - Calibrate" and Systems Operation, Testing and Adjusting, RENR9988, "System Output Current - Calibrate".

Table 1
Fuse  Type 
ACI-F1  250 VAC, 5 Amperes 
ACI-F2  250 VAC, 5 Amperes 
ACI-F3  250 VAC, 5 Amperes 
ACI-F4  250 VAC, 5 Amperes 
ACI-F6  250 VAC, 2 Amperes 

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