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| Illustration 1 | g01281529 |
Inverter Cabinet General Purpose Interface Board, left panel (1) General Purpose Interface Board | |
The General Purpose Interface Board in the Inverter cabinet is located on the left panel and performs the following functions:
Multidrop Bus
The General Purpose Interface Board provides serial data over the UPS1200 Multidrop Bus. The General Purpose Interface Board functions as a slave on this bus, receiving commands from the APC-2 and responding with status information.
The General Purpose Interface Board has a jumper-selectable 100-Ohm terminating resistor for the Multidrop bus. Jumper JMP9 provides terminal resistance. There is also a switch that sets the Node ID. Set the General Purpose Interface Board Node ID and terminating resistor jumper to the settings on the following table.
| Inverter Cabinet General Purpose Interface Board Settings | |
|---|---|
| Node ID | 0 |
| Terminating Resistor | JMP9 - Always installed |
Refer to Systems Operation, Testing and Adjusting, "Multidrop Network - Setup" for information on setting up the Multidrop Network.
Fan Tachometers
The General Purpose Interface Board provides circuitry to read magnetic tachometer signals for the five fans in the Inverter cabinet. Sensors in each fan provide once-per-revolution digital pulses to the General Purpose Interface Board. These pulses are digitized by the General Purpose Interface Board and relayed to the APC-2 in the Controls cabinet.
Temperature Measurement
The General Purpose Interface Board provides the system with temperature measurements from an on-board thermistor (R37). The thermistor measures the temperature near the General Purpose Interface Board. A thermistor that is located remotely measures the temperature at the top left side of the cabinet. The General Purpose Interface Board digitizes temperature information and makes the data available to the APC-2.
General Purpose Inputs
The General Purpose Interface Board monitors the status of the following component:
- Six Neutral Fuse Sensors
Status signals for the components are received via the General Purpose inputs on the General Purpose Interface Board. The status signals are then digitized and sent to the APC-2 board in the Controls cabinet.
LED Indicators
| Inverter GPI LED Indicators | ||
|---|---|---|
| LED | Board Designation | Purpose |
| 0 | D0 | Neutral Fuse |
| 1 | D1 | Neutral Fuse |
| 2 | D2 | Neutral Fuse |
| 3 | D3 | Neutral Fuse |
| D14 | Datalock with APC | |
Inverter Cabinet General Purpose Interface Board Diagram
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| Illustration 2 | g01281531 |
IC General Purpose Interface Board | |
Removal
- Perform steps in the Systems Operation, Testing and Adjusting, "Internal Component Preremoval Steps (Inverter Cabinet)" in order to de-energize the system and gain access to internal components.
- Disconnect all connectors from the board. The connectors are labeled as to their locations in the unit. Verify each connector to make sure that the label is present and legible.
Refer to Illustration 2.
| 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. |
- Loosen the cross head screw from the lower right corner of the board.
- Disconnect the seven white plastic stand-offs connecting the board to the right panel using the following method.
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 seven 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.
- Insert the cross head screw in the lower right corner of the board and screw it into the right panel.
- Plug the wire connectors into the correct connectors on the board. Check the labels on each connector for proper placement. Refer to Figure 2.