Cummins/Onan — Bus Voltage Calibration (C)
Adjustments · PowerCommand control bus voltage display
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFE
Before you start
- Contacting hazardous voltage components can cause electrocution, resulting in severe personal injury or death.
- Improper calibration or adjustment of the PowerCommand control can cause equipment malfunction or damage.
Procedure
- Display the Bus Voltage Calibration submenu.
- With all gensets OFF, attach a calibrated voltmeter to TB1-A (L1) and TB1-B (L2) of the bus PT module.
- Start another genset and allow it to reach normal operating speed and voltage; connect to the bus.
- Calibrate the voltage reading for Bus Volts L1 so display matches the calibrated meter.
- Shut the generator set OFF.
- Repeat steps 2 through 5 for Bus Volts L2 and L3.
- Exit menu to Save changes.
Tools required
- Calibrated RMS multimeter (Fluke models 87 or 8060A) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- TB1-A - L1
- TB1-B - L2
- TB1-C - L3
Full service-parts list: Cummins/Onan DFE →
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.