Cummins/Onan 3100 series — Current Transformer (CT) Installation
Installation · Current transformers
For the Cummins/Onan 3100 series, from the Cummins/Onan service manual.
Applies to: Cummins/Onan GGKD
Before you start
- Improper installation of CTs 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.
- CT21 for U load leads (A phase).
- CT22 for V load leads (B phase).
- CT23 for W load leads (C phase).
- 6 lead generator sets: route generator output leads through the CTs.
- 12 lead generator sets: route load wires through the CTs.
- For 12-lead (dual secondary) CTs connect secondary wire 1 to pin 1; wire 2/3 to pin 2 (high voltage) or pin 3 (low voltage).
Full service-parts list: Cummins/Onan GGKD →
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.