The close breaker control output drives the Circuit Breaker Permissive Relay (CBPR). The generator circuit breaker connects the generator to the bus. The inactive level of this output is floating. The voltage range may be from 5.2 DCV to the voltage of the positive battery terminal "(BATT+)". The active voltage level is at the voltage of the negative battery terminal ("BATT-").
For Automatic Synchronization, the output of the close breaker control is pulsed active for a programmed period of time. The period of time is set according to setpoint P302. While the conditions for synchronization are satisfied, the close breaker control output is repeatedly activated at one second intervals. When the breaker sensor input indicates that the generator circuit breaker is closed, the activation of the close breaker control output is discontinued. Also, the activation of the close breaker control input is discontinued when setpoint P314 (Maximum Synchronization Time) is exceeded.
A possible cause of a CID 0858 FMI 03 is a short from "BATT+" to the signal for the close breaker control output. A CID 0858 FMI 03 is only detected when the GSC+P is attempting to activate the output of the close breaker control. The GSC+P treats a CID 0858 FMI 03 as an alarm fault. CID 0858 FMI 03 will cause the GSC+P to stop the synchronization process until the FMI 03 is cleared and the diagnostic code is corrected.
Test Step 1. CHECK THE INACTIVE VOLTAGE LEVEL OF THE CLOSE BREAKER CONTROL OUTPUT.
- Turn the Engine Control Switch (ECS) to STOP.
- Locate the wire that connects pin 37 on the GSC+P to terminal SIAR-10 on the System in Auto Relay.
- Remove the wire from terminal SIAR-10 only. The GSC+P remains connected to the wire.
- Measure the voltage at pin 37 on the GSC+P.
Expected Result:
The voltage should measure 5.2 ± 1.0 DCV.
Results:
- OK - The voltage measures 5.2 ± 1.0 DCV. The voltage is correct. Proceed to Test Step 2.
- NOT OK - The voltage is less than 4.2 DCV or the voltage greater than 6.2 DCV.
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 LEVEL OF THE CLOSE BREAKER OUTPUT.
- The wire from terminal SIAR-10 on the parallel mode switch remains disconnected.
- Start the engine and run the engine.
- Perform the Manual Paralleling function. If necessary, refer to Systems Operation, "Synchronization Sequence Of Operation".
- Manually bring the engine into synchronization with the bus. The synchroscope pointer will be at the top center position. This position indicates a phase angle of zero degrees.
Expected Result:
When the "IN SYNC" symbol is turned ON, the voltage level of the close breaker control output should read 0.0 ± 1.0 DCV.
Results:
- OK - The voltage level is 0.0 ± 1.0 DCV. The voltage level is correct. The GSC+P is operating correctly. The problem is in the wiring or a component that is connected to the close breaker control output.
Repair: Use the information about the FMI and the system schematic for the close breaker control output to find the exact cause of the diagnostic code.
STOP
- NOT OK - The voltage level is not 0.0 ± 1.0 DCV. The voltage level is NOT correct.
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