Cummins/Onan QST30 — Voltage and Frequency Adjustment
Adjustments · PCC control
For the Cummins/Onan QST30, from the Cummins/Onan service manual.
Applies to: Cummins/Onan DFHA, Cummins/Onan DFHB, Cummins/Onan DFHC, Cummins/Onan DFHD, Cummins/Onan QST30, Cummins/Onan QST30 engine
Procedure
- Attach calibrated frequency/voltmeter to AC output L1 to L2 with generator set OFF.
- Select ADJUST from Main Menu to display VOLTAGE adjust menu.
- Start generator set and allow to reach normal operating speed.
- Adjust VOLTAGE so calibrated voltmeter reads desired voltage.
- Select Frequency adjust menu.
- Verify frequency on calibrated meter is desired frequency. Adjust if not.
- Select EXIT if no adjustment; SAVE then EXIT if adjustment made.
Tools required
- calibrated frequency/voltmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan DFHA →, Cummins/Onan DFHB →, Cummins/Onan DFHC →, Cummins/Onan DFHD →, Cummins/Onan QST30 →
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.