RING-PISTON 4L9783 - Caterpillar

System Operation Description:The engine does not shut down when a shutdown fault occurs.
Illustration 1 g00798236
System Schematic For Unexpected ShutdownNote: 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
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+.