LINE AS 6N8979 - Caterpillar

Shutdown mode prevents damage to the generator set when a shutdown fault is occurring. A shutdown 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 shutdown
Spare 1, Spare 2, Spare 3 (that are accompanied by the fault shutdown indicator)If the fault shutdown indicator is the only indicator FLASHING, additional information is available. A fault code is shown on the upper display which more precisely identifies the cause of the shutdown fault. See System Operation, "Fault Description" for more information.Shutdown Mode Sequence
A shutdown fault occurs and the GSC detects the shutdown fault.
On EUI engines, in order to shut off the fuel, the GSC deactivates the electronic governor relay (EGR). On PEEC engines, the GSC deactivates the run relay (RR). The normally open contacts of the run relay now de-energize the REL relay coil. The ESDR is then de-energized. The normally closed contacts of the ESDR send a ground signal to the PEEC in order to shut down the engine.
In order to prevent the engine from starting, the GSC deactivates the run relay (RR), and the GSC deactivates the starting motor relay (SMR).
In order to remove the generator load, the GSC activates the genset 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 System Operation, "Spare Input/Output Programming OP6".
The GSC activates the air shutoff relay (ASR) for 15 seconds during an emergency stop fault, during an engine overspeed fault, or during an speed sensor fault (CID 190).
When engine speed reaches 0 rpm, the GSC deactivates the crank termination relay (CTR). The electronic governor relay (EGR) is deactivated when the engine oil pressure reaches the setpoint P14 for low oil pressure shutdown at idle speed 70 kPa (10 psi).
If engine speed does not decrease by at least 100 rpm within five seconds, the GSC activates the ASR for 15 seconds.Note: The ASR would already be activated for an emergency stop fault, engine overspeed fault, or speed sensor fault.
The GSC FLASHES the corresponding shutdown indicator. If the fault shutdown indicator is FLASHING, a fault 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 fault code is shown on the upper display that better identifies the cause of the shutdown fault. See the Systems Operation, "Fault Description".
The lower display continues to show the engine