The MX150 Microprocessor is a generator-set controller. It is used on generator sets from GE Zenith Controls, including the MX150.
| Symptom | Cause | Remedy |
|---|---|---|
| ATS will not transfer to SOURCE 1 | SOURCE 1 AVAILABLE LED off, None | SOURCE 1 voltage or frequency not within acceptable parameters Power supply connector unplugged Check utility and utility breakers Plug in connector |
| ATS will not transfer to SOURCE 2 | SOURCE 2 AVAILABLE LED off, None | SOURCE 2 voltage or frequency not within acceptable parameters Power supply connector unplugged Check: Engine Start Connections, Generator Breaker, Generator Output, and Engine Control Switch Plug in connector |
| Engine does not START | SOURCE 2 AVAILABLE LED off, Engine start wires not terminated properly | Check engine start connections |
| Engine does not stop | LCD Display - “TD Engine Cool Down”, SOURCE 1 POSITION, and SOURCE 1 and SOURCE 2 AVAILABLE LEDs on, but U timer has timed out | U timing cycle not complete Engine start wires not terminated correctly Generator in MANUAL Check U timer setting Check Engine Start Connections Place generator in AUTO |
| Generator is in OFF position | Investigate why Engine Control Switch was turned off | |
| LCD Display - “ATS Open Time Remaining _ _ _ _” | DW timing cycle not complete Check DWTimer setting | |
| LCD Display - “Diagnostic Code 001” | Call Technical Services | |
| LCD Display - “S1 OK Time Remaining _ _ _ _ Bypass” | Limit switch or RT box connector unplugged | T timing cycle not complete Check TTimer setting |
| LCD Display - “S1 _ _ _ _ TD XFR S1>S2 Time Remaining _ _ _ _” | W timing cycle not complete | Check WTimer setting |
| ZTG Series LCD Display - “ATS Open Time Remaining _ _ _ _” | TD timing cycle not complete Check DTTimer setting |
Fault codes and symptom→remedy steps extracted from this controller’s service/owner documentation; verify against the official manual before servicing. Aggregated from the service documentation of generator sets built on this controller.