Armature Circuit Open (Loop Confirm)

¿Qué significa F901 ?

This fault is triggered if the motor armature circuit is not closed before the "Loop Confirm" signal asserts, preventing the drive from establishing a closed current path to the motor. It indicates a disconnection that inhibits motor operation and often occurs during the drive's startup sequence.

• Disconnection or damage in the motor armature power cabling between the drive and the motor.
• Failure of the main armature contactor to close properly, leaving the circuit open.
• Issues with the "Loop Confirm" input signaling closure prematurely when the armature path is still open.

Haga clic en los pasos para seguir su progreso.

1. 1

   De-energize the drive and visually inspect all motor armature power connections for looseness or damage.

2. 2

   Perform a continuity check on the motor armature power cables and through the main armature contactor's power contacts.

3. 3

   Confirm that the "Loop Confirm" input signal accurately reflects the actual closed state of the armature circuit.

4. 4

   Verify the motor's armature winding resistance against manufacturer specifications.