Field circuit interrupted

What does FCI mean?

This fault indicates an open circuit or very high resistance in the field circuit of a DC motor, preventing or severely limiting current flow to the motor field winding. Without a proper field, a DC motor can become unstable or overspeed. By default, this critical condition triggers a full TRIP, inhibiting all ignition pulses and resetting the Ready signal, to prevent uncontrolled operation and potential damage. Manual reset is required.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify external field supply (if applicable): If the field is separately excited, ensure the external power supply is providing the correct voltage/current.

2. 4

   Check field winding integrity: Test for continuity across the motor field windings.

3. 5

   Review drive field control parameters: Ensure field current limits and regulation parameters are set correctly.