VALVE GP-MAIN CONTROL 4559799 - Caterpillar

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(131) Radiator fan motor starter The motor starter for the radiator fan consists of a 3-phase contactor and overload protection. The contactor opens and closes to complete the circuit and start the fan motor. The overload (OVL) device is a protective relay that opens if the motor draws too much current over time to prevent the motor from overheating.Radiator Fan Operation
The engine begins to crank.
Relay 5 (R05) on the EMCP 3, triggers the "Engine Running Relay" (ERR).
Relay 5 (R05) on the EMCP 3, triggers the "Radiator Motor Timer" (TMR).Note: If the engine is in the "IDLE" mode, then the TMR will be prevented from activating as a protection against running the motor at a reduced voltage.
The TMR will begin timing. After the selected time has passed, the TMR will activate the motor starter coil (MS1).Note: The factory default time for TMR is 10 seconds.
MS1 will close. The MS1 contactor will complete the circuit to the fan motor. The fan will start as long as the OVL has not tripped.
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Alarms for the Radiator Fan Motor
DI07
The circuit breaker for the radiator fan motor has an auxiliary contact that is connected to digital input #7 of the digital input/output (DIO) module. If the breaker is tripped, the EMCP will display the alarm "Custom Input #7". The alarm will be displayed in the "External IO" heading. The engine will initiate a shutdown if the water temperature is too hot. Refer to Table 2.DI08
The motor starter has an auxiliary contact that is connected to digital "Input #8" of the DIO module. If the overload element has overheated, the EMCP will display the alarm "Custom Input #8". The alarm will be displayed in the "External IO" heading. The engine will initiate a shutdown if the water temperature is too hot. Refer to Table 2.
Table 2
Alarm Code    DIO    Problem    Description    
DI07     Input #7     Radiator circuit breaker is open     Due to the tripped breaker, the radiator fan motor will not operate    
DI08     Input #8     Motor starter overload element has overheated     Due to the open overload element, the radiator fan motor will not operate.    
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Refer to Schneider Electric publications for more information on the circuit breaker for the motor starter.Space Heater
The generator space heater (GSH) will heat the generator and keep condensation from forming in the windings. The GSH does not have a sensor to regulate the temperature. The space heater