Cummins/Onan — Current Transformer (CT) Installation Requirements
Installation · Current transformers
From a Cummins/Onan service manual covering: C400 D5e, C400D5, C450 D5e, C450 D6e, C450D5, C450D6, C500 D5e, C500 D6e, C550, C550 D5, QSX15. Check it applies to your exact model before use.
Applies to: Cummins/Onan C400 D5e, Cummins/Onan C450 D5e, Cummins/Onan C450 D6e, Cummins/Onan C450D5, Cummins/Onan C450D6, Cummins/Onan C500 D5e, Cummins/Onan C500 D6e, Cummins/Onan C550 D5, Cummins/Onan QSx15, Cummins/Onan QSX15-G8/G9 engine
Procedure
- The CT has a dot on one side; the dot must be facing toward the generator reconnection terminal block (conventional current flowing into the dot).
- A dot is also used to indicate pin 1 of the CT.
- Route the load lead (U, V or W) through the appropriate CT (refer to Reconnection Diagram).
- The CTs have dual secondaries (3 pins). CT secondary wire marked 1 is connected to pin 1; wire marked 2/3 is connected to pin 3 for low voltage generator sets.
Full service-parts list: Cummins/Onan C400 D5e →, Cummins/Onan C450 D5e →, Cummins/Onan C450 D6e →, Cummins/Onan C450D5 →, Cummins/Onan C450D6 →, Cummins/Onan C500 D5e →, Cummins/Onan C500 D6e →, Cummins/Onan C550 D5 →, 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.