Cummins/Onan — Electric Governor Controller Adjustment
Adjustments · Electronic governor controller
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDGDA, Cummins/Onan MDGDB
Procedure
- Push both selector switches (S1, S2) on the controller to their OFF positions.
- Set pots initially: Gain 20%, I 20%, D 30%, Droop 0%.
- If a remote speed pot is used, set it at its midpoint.
- Start the set and adjust the Speed pot for required frequency: 60 Hertz (1800 RPM) or 50 Hertz (1500 RPM); warm up under load.
- Disconnect the load and turn the GAIN pot to 100 percent or until operation becomes unstable, then turn counterclockwise until stable.
- Adjust the D pot as in Step 5.
- Adjust the I pot as in Step 5.
- Readjust Speed if necessary.
- Manually push the throttle to minimum speed, hold until the engine reaches minimum speed, release and observe speed overshoot.
Specs & values
- Pots adjustable from zero to 100 percent in divisions of ten percent
- Speed pot has a 20-turn adjustment range
- Initial settings: Gain 20%, I 20%, D 30%, Droop 0%
- 60 Hertz (1800 RPM) or 50 Hertz (1500 RPM)
- Two to Five Hertz overshoot may be acceptable
Full service-parts list: Cummins/Onan MDGDA →, Cummins/Onan MDGDB →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.