Armature Circuit Open (Early Detection)

What does F98 mean?

This fault indicates that the motor's armature circuit is detected as open when the "Loop Confirm" signal activates, typically during the initial pre-loading sequence. This condition prevents the drive from establishing proper control of the motor and indicates a critical disconnection in the power path.

• A physical break or disconnection in the motor armature circuit wiring.
• The main armature contactor is not closed or has failed to make proper contact.
• Faulty "Loop Confirm" sensor or feedback circuit providing an incorrect status of the armature circuit.

Click steps to track your progress.

1. 1

   Power down the drive, then inspect all connections in the motor armature circuit (e.g., motor terminals, contactor terminals) for looseness or damage.

2. 2

   Measure the resistance across the motor armature terminals to verify winding integrity and continuity.

3. 3

   Verify the main armature contactor is picking and its main power contacts are closing when commanded.

4. 4

   Check the wiring and functionality of the "Loop Confirm" feedback signal to ensure it accurately reflects the armature circuit status.