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


General Purpose Interface PWA (MMS System Cabinet)

Usage:

UPS 250 APZ

User Interface Printed Wire Assembly Description

The board for the user interface printed wire assembly (PWA) provides the interface to the front panel. Also, the board contains a buzzer which is the alarm for the UPS.

The display sends data to the controller and from the controller regarding the status of the UPS.

The board sends signals about the status of the EPO switch and the key switch back to the system controller.

The user interface board communicates with the APC by using the following forms of communication:

  • Two half duplex differential serial links

  • Two status lines

The user interface board is located on the back of the left door. Refer to Illustration 1.



Illustration 1g01272260
Location of the user interface board
(1) User interface board


Illustration 2g01272280
Hardware for the user interface board


Illustration 3g01272281
User interface board
(2) LCD panel
(3) Nuts

Removal Procedure

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



    Illustration 4g01272290
    Diagram of the User interface board

  1. Disconnect all connectors to the board (1). Verify each labeling on the connector with the location of the wire. Refer to Illustration 4 for a diagram of the User Interface Board (1).

  2. Remove the four nuts that connect the board (1) to the door.

  3. Remove the user interface board (1).

Installation Procedure

  1. Attach the board to the spacers with the four nuts.

  2. Connect the wire connectors into the correct connectors on the board (1). Check the labels on each connector for proper placement. Refer to Illustration 4.

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