DRIVE GP-FINAL 3530602 - Caterpillar

Illustration 1 g01444276
System Schematic For kW Level OutputThe kW level output will be activated whenever the total power output of the generator exceeds the setpoint P139. The kW level output is the connector pin 34 of the GSC+P. This setpoint can be programmed from 0 to 110 percent of the rated power on the nameplate (setpoint P030). This setpoint can be programmed with a time delay from 0 to 120 seconds (setpoint P140). Refer to System Operation, "Engine/Generator Programming OP5-0". Also, refer to System Operation, "Service Mode". Once the output is activated, the kW level output will be deactivated when the total power output of the generator drops below the programmed setpoint (setpoint P141). This setpoint is different from the activation setpoint. This setpoint can be programmed from 0 to 110 percent of the power rating on the nameplate of the generator. This setpoint can be programmed with a time delay from 0 to 120 seconds.When kW relay is disconnected from the GSC+P, the voltage on the kW level output is approximately 5.0 DCV. When kW relay is connected to the GSC+P, the voltage on the kW level output is approximately 0 volts. The kW level output is capable of drawing (sinking) approximately 100 mA. Documenting and troubleshooting any connections to this output is the responsibility of the customers and the dealers. The possible cause of a CID 0859 FMI 3 is a short from the positive battery terminal circuit ("BATT+") to the kW level output.The GSC+P treats a CID 859 FMI 03 as an alarm fault.Troubleshooting of this failure is straight forward. The FMI 03 defines the problem as a short to "BATT+". Use the following information in order to find the exact cause of the diagnostic code.
FMI information
system schematic of the kW level output
customer's documentation
dealer's documentationTest Step 1. CHECK THE GENERATOR SET CONTROL
Verify that the CID 0859 FMI 03 diagnostic code is active.
Disconnect the wire from pin 34 of the GSC+P.
Measure the voltage between pin 34 of the GSC+P and "BATT-".Expected Result:The voltage is approximately 5 1.0 DCV.Results:
OK - The voltage is approximately 5 1.0 DCV. The voltage is correct. Proceed to Test Step 2.
NOT OK - The voltage is NOT approximately 5 1.0 DCV. The voltage is NOT correct. The GSC+P has failed.Repair: It