Cummins/Onan — Voltage Measurement for Display (Meter Calibration)
Adjustments · PCC1302 control
From a Cummins/Onan service manual covering: 1302 series control, HMI211, HMI211RS, PCC 1302. Check it applies to your exact model before use.
Applies to: Cummins/Onan PCC 1302
Before you start
- Contacting high voltage components can cause electrocution, resulting in severe personal injury or death. Calibration and adjustment must be performed by technically qualified personnel only.
Procedure
- View the service menu by holding down the "up" and "down" arrow keys on any of the operating menus.
- Select item 1, "Setup Menu".
- Enter Setup menu password "574".
- Select item 1, "Genset Service".
- Select item 1, and verify the "Volts AC" setting is correct for your application; adjust and save if necessary.
- Press the back button to return to service menu.
- With the genset OFF, attach a calibrated voltmeter to the AC Output from L1 to L2.
- Start the genset and allow it to reach normal operating speed.
- Select item 3, "Meter Calib".
- Press the down arrow twice to scroll down to the "Metering Voltage Adjust".
- Adjust the three parameters one by one so the display agrees with the calibrated voltmeter.
- Shut the generator set OFF.
- Repeat for L2 and L3.
- Save the adjustment by pressing the "Save" button.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan PCC 1302 →
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.