Cummins/Onan DF Series — Generator Voltage Adjustment and Checking

For the Cummins/Onan DF Series.

Applies to: Cummins Onan Df Series

Procedure

1. Move the Run/Stop/Remote switch on the engine control panel to the RUN position.
2. Operate Phase Selector switch to read generator voltage.
3. Check line-to-line voltages (L1-L2 on single phase sets; L1-L2, L2-L3, and L3-L1 on three phase sets).
4. Verify reading matches set nameplate rating.
5. Adjust voltage using internal or external control panel mounted potentiometers.
6. Verify frequency meter reading matches nameplate rating (50 or 60 Hz).
7. Check AC ammeter with phase selector switch at each phase selection.
8. Verify at no load, current readings are zero and with load applied, each line current is approximately the same.

Source: manual:960-0604 Onan DFW DFY DFZ Installation Manual (11-1986).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.