The "ATB+" reduces the AC voltages to neutral voltages and phase currents from the generator to usable signal levels for the GSC+P. The GSC+P uses these reduced signals for the following reasons: metering AC power, calculating the phase angle with the bus and detecting the phase sequence of the generator. The phase sequence of the generator is the following order: Phase A, Phase B and Phase C.
The possible cause of a CID 1169 FMI 02 is a short between two or three phases of the output of the ATB+. The phase angle between any two phases is 120°. The short will make the phase angle between any two phases unequal to 120°.
The GSC+P treats a CID 1169 FMI 02 as an alarm fault. The GSC+P will stop the "Speed Adjust 1" and Close Breaker functions by the GSC+P. The CID 1169 FMI 02 will not affect any other synchronization processes.
Test Step 1. CHECK THE LINE-TO-LINE VOLTAGES.
- Start the engine.
- Record the line to line voltage on the upper display of the GSC+P.
Expected Result:
The line-to-line voltages should be equal within ±5%. The voltages should also be within a reasonable value of the rated voltage of the genset.
Results:
- OK - The line-to-line voltages are equal within ±5% and the voltages are within a reasonable value of the rated voltage of the genset.
Repair: The ATB+ has failed. Replace the ATB+. See Testing and Adjusting, "EMPC Electronic Control (AC Transformer Box) - Replace".
STOP
- NOT OK - The voltages are not correct.
Repair: Use the ATB+ System Schematic and the AC Schematic in the Schematics And Wiring Diagrams section to troubleshoot the wiring and find the exact cause of the problem. A short on the output of the phases of the ATB+ will not normally cause permanent damage to the ATB+. Remove the problem and check for proper operation before replacing any components.
STOP