| Engine Fails to Start |
Air in the fuel pipe |
Remove air from the pipe |
| Speed signal interrupted |
Check the sensor and cable |
| Controller power disconnected or reversed |
Check the power supply and wiring |
| Governing mechanism transmission rod stuck at zero |
Reinstall and adjust |
| Controller output current limit value is too low |
Adjust the fuel supply potentiometer clockwise |
| External input protection is activated |
Check whether the system fault input terminal is always at a high level |
| Engine Overstarts |
Actuator and engine fuel mechanism misaligned |
Check and reinstall or adjust |
| Zero positions of actuator and mechanism mismatch |
Reinstall and adjust |
| Controller speed setting too high |
Reduce the set speed |
| Improper controller parameter adjustment |
Increase "GAIN" and "STAB" appropriately |
| Controller output current limit value too high |
Adjust the fuel supply potentiometer counterclockwise |
| Engine Speed Unstable |
Transmission rod between actuator and rack sticks or gaps |
Check and reinstall, and lubricate the actuator bearings with engine oil |
| Excessive engine load |
Reduce the engine load |
| Loose or worn speed sensor |
Tighten or replace the sensor |
| Incorrect speed sensor installation gap |
Check and reinstall (around 0.8 mm) |
| Improper controller parameter adjustment |
- If high-frequency vibration (>10 Hz), decrease "GAIN" and "STAB". |
| - If low-frequency oscillation (<1 Hz), increase "GAIN" and "STAB". |
| Engine Stops Automatically |
Controller power supply interrupted |
Check the power supply and cables |
| Speed feedback signal interrupted |
Check the sensor and cables |
| Speed setting signal interrupted |
Check the remote potentiometer and cables |
| Actuator cable open or short circuit |
Check the actuator and cables |
| Engine fuel supply interrupted |
Refuel and remove air from the fuel pipe |
| Overspeed protection activated with low frequency set |
Reset the overspeed protection frequency |
| Engine Fails to Stop |
Zero positions of actuator and fuel mechanism mismatch |
Check and reinstall or adjust |
| Fuel transmission mechanism stuck |
Check and reinstall or clean the mechanism |
| Controller power cannot be disconnected |
Check the power supply and connection cables |
| Engine Speed Cannot Be Adjusted |
Fuel transmission mechanism stuck |
Check, readjust, or clean the injection system |
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