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


Flywheel Interface PWA

Usage:

UPS 250 APZ

Description



Illustration 1g01278444
Location of the Board for the Flywheel Interface
(1) "Flywheel Interface" Board

The Flywheel Interface Board is the interface between the following components and the system controller: Load Cell, Top Bearing Temperatures, Temperatures (Field Coil), Armature Temperatures, Bottom Bearing Temperatures, Speed Sensing and Signals (Vibration).

Removal Procedure

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


NOTICE

Electrostatic discharge can damage integrated circuits or semiconductors if you touch bus connector pins. When not in use, keep the module in its static-shield bag. Follow these guidelines when you handle any module:

Touch a grounded object to discharge static potential.

Wear an approved wrist-strap grounding device.

Do not touch the bus connector or connector pins.

Do not touch circuit components inside the module.

If available, use a static-safe work station.




    Illustration 2g01278446
    Diagram of the "Flywheel Interface" Board

  1. Disconnect all connectors from the board (1). Verify each label for each connector for subsequent installation. Refer to Illustration 2.

  2. Remove the three screws from the right side of the board (1) that connect the board (1) to the frame of the cabinet. Refer to Illustration 1.

Installation Procedure


NOTICE

Electrostatic discharge can damage integrated circuits or semiconductors if you touch bus connector pins. When not in use, keep the module in its static-shield bag. Follow these guidelines when you handle any module:

Touch a grounded object to discharge static potential.

Wear an approved wrist-strap grounding device.

Do not touch the bus connector or connector pins.

Do not touch circuit components inside the module.

If available, use a static-safe work station.


  1. Position the board (1) on the frame of the cabinet on the right side of the cabinet. Refer to Illustration 1.

  2. Attach the three screws to the right side of the board (1). Attach the board (1) to the frame of the cabinet.

  3. Connect the wire connectors into the correct location on the board. Refer to Illustration 2.

  4. Calibrate the board (1). Refer to Systems Operation, Testing and Adjusting, RENR9988, "Flywheel Load Cell - Calibrate".

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