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Home›Repair guides›Cummins/Onan›Mis-Wired Current Transformers

Cummins/Onan — Mis-Wired Current Transformers

Repair & overhaul

From a Cummins/Onan service manual — check it applies to your exact model before use.

Applies to: Cummins/Onan OTPC

Before you start

  • Do not disconnect the current module while the current transformers are energized unless the secondaries are shorted.

Procedure

  1. If Source 2 is a genset, set the operation selector switch on the generator control panel to STOP.
  2. Open the transfer switch cabinet door.
  3. Remove the protective cover from TB4.
  4. Attach the shorting bar to the center of TB4, making sure to tighten each screw.
  5. Verify which CT is mis-wired. Reverse the jumper wires on the current module for the mis-wired CT. Do not remove any CT wires from TB4.
  6. Once all wiring is properly secured, remove the shorting bar.
  7. Reinstall the protective cover on TB4.
  8. Set the operation selector switch on the generator control panel to ON.

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.

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