Cummins/Onan — Voltage and Frequency Adjustment
Adjustments · PCC ADJUST menu
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DQAD, Cummins/Onan DQAE, Cummins/Onan DQAF
Before you start
- Improper calibration or adjustment of the PowerCommand control can cause equipment malfunction or damage. Calibration and adjustment must be performed by technically qualified personnel only.
Procedure
- With the genset OFF, attach a calibrated frequency/voltmeter to the AC output from L1 to L2.
- Select ADJUST from the Main Menu to display the VOLTAGE adjust menu.
- Start the genset and allow it to reach normal operating speed.
- Adjust VOLTAGE so that the calibrated voltmeter reads the desired voltage.
- Select the Frequency adjust menu and verify/adjust frequency to the desired value.
- Select EXIT if no adjustment was made; if an adjustment was made, SAVE then EXIT.
Tools required
- Calibrated RMS multimeter (Fluke 87 or 8060A) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Voltage and frequency can be adjusted +/- 5%
- Adjusted only when the generator set is running under normal operating parameters (not in idle mode)
Full service-parts list: Cummins/Onan DQAD →, Cummins/Onan DQAE →, Cummins/Onan DQAF →
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.