Cummins/Onan — Current Transformer (CT) Installation
Installation · Current transformers (CTs)
From a Cummins/Onan service manual — check it applies to your exact model before use.
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 CTs will cause a “335 Reverse Power” shutdown error.
Procedure
- Orient CT dot toward the generator (conventional current into dot).
- Route U/A, V/B, W/C load leads through CT21, CT22, CT23.
- 6 lead sets: route generator output leads through the CTs.
- 12 lead sets: route load wires through the CTs.
- Connect CT secondary wire 1 to CT pin 1; 2/3 to pin 2 (high voltage) or pin 3 (low voltage).
Specs & values
- CT21 - U load leads (A phase)
- CT22 - V load leads (B phase)
- CT23 - W load leads (C phase)
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.