Electronic Modular Control Panel II+ (EMCP II+) Caterpillar

The engine does not shut down when a shutdown fault occurs.

Illustration 1	g00798236
System Schematic For Unexpected Shutdown

Note: It is extremely important that the setpoint P023 for the GSC+ is correct for the engine application. Ensure setpoint P023 is programmed correctly for the engine application before continuing with this procedure.

There are several possible causes for an engine that is not shutting down when a shutdown fault occurs:

• 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.

• Programming Error - Fault Is Overridden Or 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 or codes shown on the GSC+. In these cases, it is a good idea to check any setpoints related to that fault. For example, if a genset is not shutting down when an overvoltage fault occurs, make sure setpoint P104(Overvoltage shutdown enable) is programmed correctly.

• Programming Error - Setpoints Incorrect For Application Or Customer Needs: 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. For example, if the genset is not shutting down when a high coolant temperature condition occurs, make sure setpoint P015 (High Water Temperature Shutdown) is correct for the application.

• Faulty Component: Some examples of faulty components that could prevent the GSC+ from shutting down the engine are: PEEC, GSC+ and a broken or shorted harness wire.. In this case, the GSC+ or PEEC will be issuing a command to shut down the engine due to a diagnostic code, but the engine remains running.

Test Step 1. CHECK FOR DIAGNOSTIC CODES

1. 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

1. Check the display area of the GSC+ for the yellow fault alarm indicator.

Expected Result:

The fault alarm indicator should be illuminated CONTINUOUSLY.

Results:

• YES - The 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 OP2-0". In order to reprogram the setpoints, see System Operation, "Engine/Generator Programming OP5-0".

  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.

1. 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 OP2-0". In order to reprogram the setpoints, see System Operation, "Engine/Generator Programming OP5-0"

  Stop.

Test Step 4. CHECK THE SYSTEM BY USING THE ESPB.

The engine remains running and the red fault shutdown indicator is FLASHING.

1. Push the emergency stop push button (ESPB).

Expected Result:

The engine should shut down.

Results:

• OK - The engine does shutdown.

  Repair: Replace the PEEC or the ESDR. Verify that the repair corrects the problem.

  Stop.

• NOT OK - The engine does NOT shut down. There is an engine problem.

  Repair: Check the fuel shutoff solenoid (FSOS) and the engine fuel system. Refer to the appropriate engine service manuals.

  Stop.