The engine does not shut down when a shutdown fault occurs.
Note: It is critical that GSC setpoint P23 is correct for the engine application. Ensure that setpoint P23 is programmed correctly for the engine application before continuing with this procedure.
There are several possible causes when a shutdown fault occurs and an engine does not shut down:
- Operator Error: The operating conditions of the generator may not be understood by the operator. Ensure that the condition is one that should cause an engine shutdown.
- The Fault Is Overridden Or The Fault Is Disabled.: It is possible to program the GSC in order to override certain shutdown faults. An overridden shutdown fault will be treated as an alarm fault. The YELLOW fault alarm indicator will be FLASHING instead of the RED fault shutdown indicator. If the GSC is programmed in order to disable a particular fault, there will not be any fault indicators. Check any related setpoint.
- Incorrect Setpoint : It is possible to program the GSC setpoints to a value that does not allow the situation to be recognized by the GSC as a shutdown condition. In this case, check the appropriate setpoints for correct values.
- Faulty Component: GSC and an open wire or a shorted wire. The GSC tries to shut down the engine. The engine remains running.
Test Step 1. CHECK FOR DIAGNOSTIC CODES
- Check the GSC for a diagnostic code on the upper display.
Expected Result:
The GSC should show a diagnostic code on the upper display.
Results:
- YES - The GSC shows a diagnostic code on the upper display.
Repair: See theTesting and Adjusting section of this book for the diagnostic code that is displayed on the GSC.
Stop.
- NO - The GSC does NOT show a diagnostic code on the upper display. Proceed to Test Step 2.
Test Step 2. CHECK THE YELLOW FAULT ALARM INDICATOR
- Check the display area of the GSC for the yellow fault alarm indicator.
Expected Result:
The yellow fault alarm indicator should be illuminated CONTINUOUSLY.
Results:
- YES - The yellow fault alarm indicator is illuminated CONTINUOUSLY.
Repair: The GSC has been programmed to override the normal shutdown response and the GSC treats the condition as an alarm fault. The engine will continue to run. In order to view the setpoints, see System Operation, "Engine/Generator Setpoint Viewing OP2". In order to reprogram the setpoints, see System Operation, "Engine/Generator Programming OP5".
Stop.
- NO - The yellow fault alarm indicator is not illuminated at all. Proceed to Test Step 3.
Test Step 3. CHECK FOR RED FAULT SHUTDOWN INDICATOR.
- Check the display area of the GSC for a red fault shutdown indicator.
Expected Result:
The red fault shutdown indicator should be FLASHING.
Results:
- YES - The red fault shutdown indicator is FLASHING and the engine remains running. Proceed to Test Step 4.
- NO - All fault indicators are OFF. A problem that is occurring should cause the GSC to shut down the engine. It is possible to program the GSC setpoints to a value that does not allow the situation to be recognized by the GSC as a shutdown condition.
Repair: Check the appropriate setpoints for correct values. In order to view the setpoints, see System Operation, "Engine/Generator Setpoint Viewing OP2". In order to reprogram the setpoints, see System Operation, "Engine/Generator Programming OP5".
Stop.
Test Step 4. CHECK THE SYSTEM BY USING THE ESPB.
The engine remains running and the red fault shutdown indicator is FLASHING.
- Push the emergency stop push button (ESPB).
Expected Result:
The engine should shut down.
Results:
- OK - The engine does shutdown. The relay module has failed.
Repair: Replace the relay module. See Testing And Adjusting, "Relay Module - Replace".
Stop.
- NOT OK - The engine does NOT shut down. Proceed to Test Step 5.
Test Step 5. CHECK FOR FUEL CONTROL SOLENOID AND ENGINE PROBLEMS
The engine remains running and the red fault shutdown indicator is FLASHING.
- Stop the engine. (Turn the battery disconnect switch to the off position.)
- Remove all the wires from "TS1-7" in the control panel.
- Turn the ECS to the START position. Attempt to start the engine.
Expected Result:
The engine should not start.
Results:
- OK - The engine does not start. Therefore, there is a wiring error or there is a short to the +battery between terminal "TS1-7" and the relay module.
Repair: Troubleshoot and repair the wiring. See the Main Chassis Wiring Diagram in the Schematics and Wiring Diagram Section.
Stop.
- NOT OK - The engine continues to run and the red fault shutdown indicator is FLASHING. There is a problem with the engine.
Repair: Refer to the appropriate engine service manual in order to troubleshoot the engine.
Stop.