Cummins/Onan — AC Electrical Connections
Installation · AC wiring
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan GGHE, Cummins/Onan GGHF, Cummins/Onan V-10 WSG-1068 engine
Before you start
- Do not connect generator set directly to any building electrical system
- Reconfiguring to different voltages can damage generator or windings; consult distributor
Procedure
- Place the control panel run switch in OFF position; remove AC power from battery charger; remove negative battery cable.
- Install transfer switch for standby service applications.
- Reconfigure generator output leads on connection terminal block per Reconnection Diagram as needed for nameplate voltage.
- Bolt stranded load wires to the appropriate U/V/W/N terminals.
- Balance loads so current flow from each line terminal is within 10 percent of median value.
- Install current transformers (CT21/CT22/CT23) per Reconnection Diagram with dot facing toward the generator.
- Ground the genset to earth in one location only.
Specs & values
- Load current balance within 10% of median value, not exceeding nameplate rating
Full service-parts list: Cummins/Onan GGHE →, Cummins/Onan GGHF →
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.