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FILM GP 2277959 - Caterpillar



2277959 FILM GP Caterpillar parts FILM
Rating:
16
Alternative (cross code) number:
CA2277959
227-7959
2277959
Caterpillar 2277959 FILM GP

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Wire And Pin Identification (Standard Microprocessor Based Circuit Board)
The standard Microprocessor Based circuit board interconnects electrically with other transfer switch components by means of a 15 pin connector. Connector pin numbers, associated wire numbers and their functions are as follows:Pin 1, Wire #194: Delivers +12 volts DC to the actuating coils of the Transfer Relay TR and the Time Delay neutral relay TD when the standby engine-generator has started (when the STANDBY OPERATING light comes on).Pin 2, Wire #202: This is the grounded side of the NORMAL and the FAST TEST circuit to the Operating Mode switch, and to the utility voltage sensor board.Pin 3, Wire #201: This is the "High" side of the FAST TEST circuit. Setting the Operating Mode switch to the FAST TEST position closes the circuit between Pin 3 and Pin 2, initiating a FAST TEST operation.Pin 4, Wire #203: This is the "High" side of the Operating Mode switch NORMAL TEST circuit. Setting the Operating Mode switch to the NORMAL TEST position closes the circuit between Pin 4 and Pin 2, initiating a NORMAL TEST operation.Pin 5, Wire #199: Provides a "NORMAL Source Voltage Failed" signal to the Microprocessor Based circuit board (from the Utility Voltage Sensor board).Pin 6, Wire #177: Part of the standby engine-generator automatic start/stop circuit.Pin 7, Wire #178: Part of the standby engine-generator automatic start/stop circuit. When circuit board action closes the circuit between Wires #177/178, an automatic engine-generator start signal occurs.Pin 8: Not UsedPin 9: Not UsedPin 10, Wire #193: (See Pin 1, Wire #194) Pin 10 is the negative side of the time delay neutral relay TD actuating coil. Circuit board action closes this circuit to ground to initiate the time delay neutral timing action. Circuit board action opens this circuit to ground to de-energize the time delay neutral relay TD, and allows the transfer switch to complete the transfer to either the NORMAL or the STANDBY source.Pin 11, Wire #23: (See Pin 1, Wire #194) Pin 11 is the negative side of Transfer Relay TR actuating coil. Circuit board action closes this circuit to ground, to initiate transfer to the STANDBY power source side. Circuit board action opens this circuit to ground, to de-energize the Transfer Relay and initiate re-transfer back to the NORMAL source.Pin 12, Wire #191: This is the power supply to the circuit board from the transformer reduced STANDBY source voltage when the


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