The output of the "Speed Adjust 1" provides an analog signal that is being used to vary the engine speed in order to match the phase of the generator to the phase of the bus. The full output voltage is approximately −5.0 to +5.0 DCV. If the synchronization is disabled, the output will be 0.0 ± 0.5 DCV.
Note: Setpoint P308 must be set to a value that is greater than zero in order for this procedure to be completed. This setpoint can be a value from 0 to 100. The factory default is 50. Refer to Systems Operation, "Parallel Setpoint Programming" for more information.
The possible cause of a CID 1038 FMI 04 is a short from the output signal of the "Speed Adjust 1" to the negative battery terminal.
A CID 1038 FMI 04 is detected when the GSC+P is NOT activating the output of the "Speed Adjust 1". The GSC+P treats a CID 1038 FMI 04 as an alarm fault. The synchronization process will be stopped until the diagnostic code is cleared and the diagnostic code is corrected.
Test Step 1. CHECK THE INACTIVE VOLTAGE LEVEL OF THE OUTPUT OF THE "SPEED ADJUST 1".
- Turn the Engine Control Switch (ECS) to STOP.
- Locate the wire that is connecting pin 27 of the GSC+P to terminal 24 of the Load Share Module (LSM) only. Remove this wire at terminal 24 of the LSM only. Pin 27 of the GSC+P will remain connected to the wire.
- Use a cable probe to measure the voltage on pin 27 of GSC+P.
Expected Result:
The voltage should measure 0.0 ± 1.0 DCV.
Results:
- OK - The voltage level is 0.0 ± 1.0 DCV. Proceed to Test Step 2.
- NOT OK - The voltage level is below the correct range or the voltage level is above the correct range.
Repair: The GSC+P may have failed. It is unlikely that the GSC+P has failed. Exit this procedure and perform this entire procedure again. If the problem remains, replace the GSC+P. Refer to Testing And Adjusting, "EMCP Electronic Control (Generator Set) - Replace".
STOP
Test Step 2. CHECK THE ACTIVE VOLTAGE LEVELS OF THE OUTPUT OF THE "SPEED ADJUST 1".
- The wire that is connecting pin "27" of the GSC+P and terminal 24 of the LSM remains disconnected.
- Start the engine. Adjust the engine speed so the frequency is 1.0 Hz higher than the frequency of the bus .
- Perform the Automatic paralleling function. If necessary, refer to Systems Operation, "Synchronization Tuning Procedur".
- Allow the voltage to stabilize. Use a cable probe to measure the voltage on pin 27 of GSC+P.
Expected Result:
The voltage should measure −5.0 ± 1.0 DCV.
Results:
- OK - The voltage level is −5.0 ± 1.0 DCV. Proceed to Test Step 3.
- NOT OK - The voltage is above or the voltage is below the correct voltage.
Repair: The GSC+P may have failed. It is unlikely that the GSC+P has failed. Exit this procedure and perform this entire procedure again. If the problem remains, replace the GSC+P. Refer to Testing And Adjusting, "EMCP Electronic Control (Generator Set) - Replace".
STOP
Test Step 3. CHECK THE ACTIVE VOLTAGE LEVELS OF THE OUTPUT OF THE "SPEED ADJUST 1".
- The wire that is connecting pin 27 of the GSC+P and terminal 24 of the LSM remains disconnected.
- Start the engine. Adjust the engine speed so that the frequency is 1.0 Hz lower than the frequency of the frequency of the bus .
- Perform the Automatic paralleling function. If necessary, refer to Systems Operation, "Synchronization Tuning Procedure".
- Allow the voltage to stabilize. Use a cable probe to measure the voltage on pin 27 of GSC+P.
Expected Result:
The voltage should measure +5.0 ± 1.0 DCV.
Results:
- OK - The voltage level is +5.0 ± 1.0 DCV.
Repair: The GSC+P is operating correctly, and the problem is in the wiring or the component that is connected to the output of the "Speed Adjust 1". Use the FMI information and use the System Schematic of the "Speed Adjust 1" to find the exact cause of the fault.
STOP
- NOT OK - The voltage is above or the voltage is below the correct voltage.
Repair: The GSC+P may have failed. It is unlikely that the GSC+P has failed. Exit this procedure and perform this entire procedure again. If the problem remains, replace the GSC+P. Refer to Testing And Adjusting, "EMCP Electronic Control (Generator Set) - Replace".
STOP