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.

Complete Troubleshooting Guide

1. 1

   Inspect field circuit wiring: Check all connections, cables, and field supply components between the drive and the motor's field winding for looseness or damage.

2. 2

   Measure field circuit resistance: With power off, use a multimeter to measure the resistance of the field winding circuit. Compare to expected values.

3. 3

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

4. 4

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

5. 5

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