Cummins/Onan — Electronic Governor Adjustment (Type 1)
Adjustments · Electronic governor controller
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MCGBA, Cummins/Onan MCGCA, Cummins/Onan MCGDA, Cummins/Onan MCGDB, Cummins/Onan MCGGA, Cummins/Onan MDGDA, Cummins/Onan MDGDB, Cummins/Onan MDGDC, Cummins/Onan MDGDD
Procedure
- Push both selector switches (S1, S2) on the controller to their OFF positions.
- Set the 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 to obtain the required output frequency: 60 Hertz (1800 RPM) or 50 Hertz (1500 RPM).
- Warm up the set under load until it is up to normal operating temperature.
- Disconnect the load and turn the GAIN pot to 100 percent or until operation becomes unstable, then turn it counterclockwise until stable.
- Adjust D as in the GAIN step.
- Adjust I as in the GAIN step.
- Readjust Speed if necessary.
- Push the throttle to minimum speed position and hold until minimum speed; release and observe overshoot (2 to 5 Hertz may be acceptable).
- If overshoot is unacceptable, turn the I pot clockwise slightly to reduce overshoot.
- If the set hunts during steady state, turn the I pot counterclockwise slightly until stable.
Specs & values
- Speed pot has a 20-turn adjustment range
- Required output frequency: 60 Hertz (1800 RPM) or 50 Hertz (1500 RPM)
Full service-parts list: Cummins/Onan MCGBA →, Cummins/Onan MCGCA →, Cummins/Onan MCGDA →, Cummins/Onan MCGDB →, Cummins/Onan MCGGA →, Cummins/Onan MDGDA →, Cummins/Onan MDGDB →, Cummins/Onan MDGDC →, Cummins/Onan MDGDD →
Source: Cummins/Onan operator's 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.