Cummins/Onan — CT Installation Requirements
Installation · Current Transformers (Detector Control)
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan GGHG, Cummins/Onan GGHH, Cummins/Onan WSG-1068 engine
Before you start
- Each of the operations described should be done only by persons trained and experienced in electrical maintenance.
Procedure
- The CT has a dot on one side; this dot must face toward the generator (conventional current flowing into the dot). A dot also indicates pin 1 of the CT.
- CT21 – U load leads (A phase); CT22 – V load leads (B phase); CT23 – W load leads (C phase).
- Route the appropriate load wires through each CT.
- The CTs have dual secondaries (3 pins). The secondary wire marked 1 connects to pin 1; wire marked 2/3 connects to pin 2 for high voltage gensets or pin 3 for low voltage gensets.
Full service-parts list: Cummins/Onan GGHG →, Cummins/Onan GGHH →
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.