Cummins/Onan QST30 — Digital Voltage Display Calibration
Adjustments · PCC digital display
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
- Select >> from Main Menu, proceed to VOLTS L12 menu.
- With generator set OFF, attach calibrated frequency/voltmeter to AC output L1 to L2.
- Start generator set and allow to reach normal operating speed.
- Calibrate VOLTS L12 reading to agree with calibrated voltmeter.
- Shut generator set OFF.
- Repeat steps 10 through 13 for L23 and L31.
- Select EXIT if no calibration; SAVE then EXIT if calibration 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.