armature circuit interrupted

What does ACI mean?

This fault indicates an open circuit or very high resistance in the armature circuit of a DC motor, preventing current flow to the motor windings. This could be due to a loose connection, broken cable, or brush/commutator issue. By default, this critical condition triggers a full TRIP, inhibiting all ignition pulses and resetting the Ready signal, as the drive cannot control the motor without a complete armature circuit. Manual reset is required.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

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

2. 4

   Verify motor connection integrity: Ensure motor terminal connections are secure and corrosion-free.

3. 5

   Test motor winding continuity: With power off, check for continuity across the motor armature windings.