RING 3401591 - 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
Engine overcrank
Fault shutdown
Spare 1, Spare 2, and 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.
Illustration 1 g01175372
Shutdown Mode Sequence for Engines with EIS Control
A shutdown fault occurs and the GSC+ detects the shutdown fault.
In order to shut off the fuel, the GSC+ deactivates the fuel control relay (FCR). When the FCR deactivates, the coil for the gas shutoff valve deenergizes. The gas shutoff valve is deengergized.
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+ will immediately activate K6, the ignition shutoff relay (ISR). The external slave ISR relay will be activated. The external slave ISR relay will ground the Ignition Shutdown (IS) input on the EIS module.
When engine speed reaches zero rpm, the GSC+ deactivates the crank termination relay (CTR). The electronic governor relay (EGR) is deactivated when the engine oil pressure reaches the setpoint P014 for low oil pressure shutdown at idle speed 70 kPa (10 psi).
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 that is 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 data.
The relay status indicators display the following relays.
K2 (GFR)
K6 (ISR)Shutdown Mode Sequence (GECM Controlled Engines)
A shutdown fault occurs. The GSC+ detects the shutdown fault.
The GSC+ provides a signal to the GECM to shut off the fuel. The Electronic Governor Relay (EGR) is used for this purpose. (When the GSC+ setpoint "Engine Type P023" is programmed to 2, the EGR