ADAPTER 8C7575 - Caterpillar

Description
Illustration 1 g01284217
(1) General Purpose Interface BoardThe General Purpose Interface Board (GPI) (1) for the flywheel cabinet is located on the upper left panel. The board (1) performs the following functions:Fan Tachometers
The GPI board (1) provides circuitry to read magnetic tachometer signals for the three fans that are located in the flywheel cabinet. The sensors in each fan provide digital pulses for every revolution of the fan. The pulses are sent to the GPI board (1). The pulses are made into a digital format by the GPI board (1). The pulses are then sent to the APS controller board on the front shield of the flywheel cabinet.Temperature Measurement
The GPI board (1) provides the system with temperature measurements from an on board thermistor (R37) that measures the temperature near the GPI. The GPI board (1) converts the temperature information to a digital format. The GPI board (1) sends the data to the APC board.General Purpose Inputs
The GPI board (1) monitors the status of the following components:
Keyswitch (SW1)
Emergency Module Off (EMO) (SW9)
190 VAC power from the Power Distribution Board (PWD)
24 VDC power supply
Fuse for the DC Bus F1 - F4 Status signals for the components are received through the General Purpose inputs on the GPI board (1). The GPI board (1) converts the status signals to a digital format. The GPI board (1) sends the data to the APC board.
Illustration 2 g01284260
Connections for the General Purpose Interface Board Removal Procedure
Refer to Systems Operation, Testing and Adjusting, RENR7654, "Internal Component Preremoval Steps (Flywheel Cabinet)" in order to shut down the system and gain access to internal components.
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.
Disconnect all the connectors from the board (1). Refer to illustration 2.
Remove screw (J18) from the lower left corner of the board.
Disconnect the seven white plastic standoffs that connect the board (1). Refer to illustration 2.
Pinch the head of each standoff so that the board (1) is not locked to the standoff.
Remove the board (1) by gently pulling the board (1) from all standoffs at the same time.Installation Procedure
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.
Position the board (1) in the cabinet over the seven white standoffs that are connected to the upper left panel.
Install the board (1) onto the standoffs simultaneously.
Install screw (J18) in the lower left corner of the board (1) .
Connect