Motor phase missing

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A failure of several motor phases has been detected. This indicates an open circuit in the motor power cabling or motor windings, leading to imbalanced operation or a complete stop. The error can only be reset after a 2-second blocking time.

• Open circuit in one or more motor power phases (U, V, W) due to a loose connection at the drive output or motor terminals.
• Blown fuse or tripped circuit breaker in one phase of the motor power circuit.
• Internal open circuit in the motor windings (e.g., phase-to-phase break, coil damage) leading to a missing phase.
• Damaged motor contactor or solid-state relay failing to conduct one or more phases to the motor.
• Severe imbalance in motor phases due to mechanical damage or excessive load causing current asymmetry.

Klikk på steg for å spore fremgangen.

1. 1

   Disconnect power from the drive and motor, then measure the resistance between all motor phases (U-V, V-W, W-U) at the motor terminal box.

2. 2

   Measure the resistance of each motor phase conductor from the drive output terminals to the motor terminal box to check for cable continuity.

3. 3

   Inspect all power connections at the drive's output terminals (U, V, W) and the motor's terminal box for looseness, corrosion, or signs of overheating.

4. 4

   Check for blown fuses or tripped circuit breakers in the motor power circuit, replacing or resetting as necessary.

5. 5

   Test the operation of any motor contactors or disconnect switches in the power path to ensure all phases are closing correctly.