Output phase loss

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The inverter output is shut off if one of the three phases (U, V, W) on the output side (motor/load side) is lost. This typically indicates a broken wire, loose connection, or open circuit in the motor wiring, leading to unbalanced currents and potential motor overheating.

• Output phase loss detected.
• One or more output phases (U, V, W) are disconnected.
• Open circuit in motor power cable.
• Fault in the output stage of the inverter.
• Loss of feedback from one of the motor phases.

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1. 1

   Check the motor wiring thoroughly for proper connections and continuity across all three phases.

2. 2

   Ensure that the capacity of the motor used is not smaller than that of the inverter, which can sometimes lead to phase loss detection issues.

3. 3

   If using PM sensorless vector control, ensure a start command is not given while the motor is coasting; allow the motor to stop first or utilize the automatic restart/flying start function.