Cummins/Onan PCC Control 3100 Series — Current Transformer (CT) Installation
Installation · Current transformers CT21/CT22/CT23
For the Cummins/Onan PCC Control 3100 Series, from the Cummins/Onan service manual.
Applies to: Cummins/Onan DFAA, Cummins/Onan DFAB, Cummins/Onan DFAC, Cummins/Onan DFBF, Cummins/Onan DFCB, Cummins/Onan DFCC, Cummins/Onan DFCE, Cummins/Onan DFE
Before you start
- Improper installation of CT's will cause a 335 Reverse Power shutdown error (non-parallel units only).
Procedure
- Orient the CT dot toward the generator (conventional current flowing into the dot); 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 leads through each CT: 6-lead gensets route generator output leads; 12-lead gensets route load wires.
- For 12 lead (reconnectable) gensets, connect CT secondary wire marked 1 to pin 1; secondary wire marked 2/3 to pin 2 for high voltage or pin 3 for low voltage.
- For 6 lead (non-reconnectable) gensets, connect lead from CT terminal #1 to metering circuitry and lead from CT terminal #2/3 to ground.
Full service-parts list: Cummins/Onan DFBF →, Cummins/Onan DFCC →, Cummins/Onan DFCE →, Cummins/Onan DFE →
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.