Cummins/Onan — Adjusting Voltage Using Optional Digital Display

Adjustments · Genset controller

From a Cummins/Onan service manual — check it applies to your exact model before use.

Applies to: Cummins/Onan MDKB, Cummins/Onan MDKBH

Procedure

1. Start the genset and let voltage and frequency stabilize for 5 to 10 seconds; make sure all loads have been disconnected.
2. Rapidly press START 6 times during the first minute after startup to put the genset controller into voltage adjust mode.
3. To adjust voltage up, press and quickly release START; voltage increases approximately 0.6 volts each press and release.
4. To adjust voltage down, press and hold START for about 1 second; voltage decreases approximately 0.6 volts each press and release.
5. Wait about 20 seconds for the Display to indicate a Status change from Volt Adj to Running, then press STOP to stop the genset and save the adjustment.
6. Restart the genset and check voltage.
7. Recalibrate AC Voltage on the Digital Display as instructed in the Operator's Manual.

Full service-parts list: Cummins/Onan MDKB →, Cummins/Onan MDKBH →

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.

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