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fault is critical. When a shutdown fault occurs, the GSC automatically activates shutdown mode until the shutdown fault is corrected. The GSC shuts down the engine when the GSC is in shutdown mode. The GSC prevents starting of the engine and the GSC alerts the operator. The GSC alerts the operator and the GSC identifies the shutdown fault by FLASHING the corresponding shutdown indicator. The name of the shutdown indicator identifies the shutdown fault. Shutdown Indicators
Low oil pressure
Emergency stop
High water temperature
Engine overspeed
Low coolant level
Engine overcrank
Fault shutdownIf the fault shutdown indicator is the only indicator FLASHING, additional information is available. A diagnostic code is shown on the upper display which more precisely identifies the cause of the shutdown fault. See Systems Operation, "Fault Description" for more information. Shutdown Mode Sequence
A shutdown fault occurs and the GSC detects the shutdown fault.
To shut off the fuel, the GSC deactivates the run relay (RR). The normally closed contacts of the RR send a shutdown signal to the PEEC electronic control module. The PEEC turns OFF the fuel shutoff solenoid which shuts down the engine.
In order to prevent the engine from cranking, the GSC deactivates the starting motor relay (SMR).
In order to remove the load from the generator, the GSC activates the generator fault relay (GFR). This activates the optional circuit breaker shunt trip coil.Note: The spare output may also be programmed to activate when a shutdown occurs. This output can drive a relay in order to open the circuit breaker, or the output can open a transfer switch. See Systems Operation, "Spare Input/Output Programming OP6".
The GSC activates the air shutoff relay (ASR) for 15 seconds during a fault for the emergency stop, the engine overspeed, or the engine speed sensor.
When engine speed reaches 0 rpm, the GSC deactivates the crank termination relay (CTR). The oil step relay (OSR) is deactivated when the engine oil pressure reaches the setpoint (P14) for low oil pressure shutdown at the idle speed 70 kPa (10 psi).
If engine speed does not decrease at least 100 rpm within five seconds, the GSC activates the air shutoff relay (ASR) for 15 seconds. Note: The ASR would already be activated for a fault with the emergency stop, the engine overspeed, or the engine speed sensor.
The GSC FLASHES the corresponding shutdown indicator. If the fault shutdown indicator is FLASHING, a diagnostic code is shown on the upper display. See Systems Operation, "Fault Description".
If the fault shutdown indicator is the only indicator FLASHING, additional information is available. A diagnostic code is shown on the upper display that more precisely identifies the cause of the shutdown fault. See the Systems Operation, "Fault Description".
The lower display continues to show the engine data.
The relay status indicators show.
K2 (GFR)
K6 (ASR) will show for 15 seconds for a fault with the emergency stop, the engine overspeed, or the engine speed sensor. K6 (ASR) will also show if engine speed does not decrease at least 100 rpm.Engine Start Sequence After A Shutdown
Correct the shutdown fault. See the Testing And Adjusting, "Fault Identification".
Reset the GSC by turning the ECS to "OFF/RESET". If no shutdown fault is active, the GSC returns to normal mode and the engine is able to start.