Motor Lost fault in Emotron VFX Drive indicates a phase loss or excessive imbalance between the motor phases. This means the drive has detected that one motor phase is missing, disconnected, or significantly unbalanced compared to the other phases.

This fault helps protect the motor from overheating, poor performance, and potential damage caused by single-phasing or phase imbalance.

Possible Causes:

1. Loss of one motor phase.
2. Excessive voltage imbalance between motor phases.
3. Loose motor cable connections.
4. Damaged motor cable.
5. Poor terminal connections at the motor or drive.
6. Blown fuse in one phase.
7. Defective motor winding.
8. Incorrect motor wiring.
9. Faulty drive output connection.
10. Internal motor fault.

Solutions:

1. Measure the motor voltage on all three phases and verify that the voltages are balanced.
2. Check all motor cable connections for loose, damaged, or corroded terminals.
3. Inspect the motor terminal box and tighten any loose connections.
4. Verify continuity of all motor cables.
5. Check the motor windings for phase imbalance or damage.
6. Inspect the drive output terminals for proper connection.
7. Replace damaged cables, terminals, or fuses if necessary.
8. Correct any wiring errors found during inspection.
9. If all wiring and connections are confirmed to be in good condition, contact your supplier for further diagnosis.
10. If phase-loss monitoring is not required, the Motor Lost Alarm can be disabled through the drive settings.

Additional Information

The Motor Lost protection function continuously monitors motor phase conditions. If one phase is lost or a significant imbalance occurs, the drive generates a Motor Lost fault to prevent motor overheating and potential failure.

Common causes include:

• Loose motor terminals.
• Damaged motor cables.
• Blown fuses.
• Motor winding faults.
• Voltage imbalance between phases.

Regular inspection of motor wiring, terminal connections, and supply voltage balance can help prevent recurring Motor Lost faults and ensure reliable operation of the Emotron VFX drive.