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| Illustration 1 | g01326729 |
4-Wire Transformer Cabinet Fan Plenum Panel - Version 1 (1) General Purpose Interface Board (2) External Source Sync Board (3) 4-Wire Thermal Switch Monitor Board (4) Fuses F96, F97 (5) Secondary Current Transformers (6) Fuses F58-F60 F61-F63 (7) Fuses F73-F76, F94, F95 | |
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| Illustration 2 | g01326730 |
4-Wire Transformer Cabinet Upper Panel - Version 2 Hardware (1) General Purpose Interface Board (2) External Source Sync Board (3) 4-Wire Thermal Switch Monitor Board (4) Fuses F96, F97 (5) Secondary Current Transformers (8) Fuses F61-F63 F103 (9) Fuses F73-F76, F94, F95, F104,105 (10) Fuses F64-F66 | |
The Thermal Switch Monitor Board (1) in the 4-Wire Transformer cabinet is used to provide overtemperature protection for the 4-wire output transformer. The Thermal Switch Monitor Board monitors the switches installed in the transformer and activates an LED notice at 150 °C (302 °F) and a thermal shutdown command if the transformer reaches 160 °C (320 °F).
An LED warning lamp test pushbutton is provided as well to insure that the LED lamp on the front door is functional. The normally open pushbutton on the front door will illuminate the LED notice lamp as long as the button is pushed.
The Thermal Switch Monitor Board (1) provides customer dry contacts (wired to a terminal block accessed in the 4-Wire Output cabinet for normally open conditions and normally closed conditions for both the 150 °C (302 °F) notice and the 160 °C (320 °F) trip condition.
The on-board power supply is made up of an input fuse, a diode bridge, and filter capacitors. The on-board power supply allows the Thermal Switch Monitor Board (1) to maintain 24Vdc control power even when the UPS module is shut off. The normal input to the Thermal Switch Monitor Board (1) comes from the output of the transformer.
Fuse
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| Illustration 3 | g01272116 |
The fuse (11) for the Thermal Switch Monitor Board (1) is indicated in Table 1. Visually inspect the fuse and replace if blown.
| TSM Board Fuse | |
|---|---|
| Fuse | Amperes |
| F1 | 4 |
Removal
| NOTICE |
|---|
Electrostatic discharge can damage integrated circuits or semiconductors if you touch bus connector pins. When not in use, keep the module in the 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. |
- Perform steps in the Systems Operation, Testing and Adjusting, "Internal Component Preremoval Steps (4 Wire Transformer Cabinet)" in order to de-energize the system and gain access to internal components.
- Disconnect all connectors from the board.
The connectors locations in the unit are labeled. Verify each connector to make sure that the label is present and legible.
Refer to Illustration 3.
- Disconnect the four white plastic standoffs connecting the board to the right panel using the following method.
Note: The board must be removed from the stand-offs without bending the board.
- Pinch the head of each stand-off so that the board is not locked to the stand-off but is still attached to the stand-off.
- Remove the board by gently and evenly pulling the board from all stand-offs at the same time.
Installation
| NOTICE |
|---|
Electrostatic discharge can damage integrated circuits or semiconductors if you touch bus connector pins. When not in use, keep the module in the 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. |
- Position the board in the cabinet over the four white stand-offs that are connected to the right panel.
- Push the board, gently and evenly, onto all the stand-offs simultaneously. Make sure all stand-offs are locked in place.
- Plug the wire connectors into the correct connectors on the board. Check the labels on each connector for proper placement.
Refer to Illustration 3.