Cummins/Onan QSX15 / QSx15 — Current Transformer (CT) Installation Requirements
Installation · Current transformers CT21, CT22, CT23
For the Cummins/Onan QSX15 / QSx15, from the Cummins/Onan service manual.
Applies to: Cummins/Onan DFE, Cummins/Onan DFEJ, Cummins/Onan DFEK, Cummins/Onan QSx15, Cummins/Onan QSX15 engine
Procedure
- The CT has a dot on one side. This dot must face toward the generator (conventional current flowing into the dot).
- 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.
- CT secondaries have 3 pins: secondary wire marked 1 to pin 1; wire marked 2/3 to pin 2 for high voltage gensets or pin 3 for low voltage gensets.
Full service-parts list: Cummins/Onan DFE →, Cummins/Onan DFEJ →, Cummins/Onan DFEK →, Cummins/Onan QSx15 →
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.