Output phase fault

What does F00023 mean?

One of the inverter's output phases to the motor is disconnected or open-circuited. This causes unbalanced current flow to the motor, leading to excessive motor heating, reduced torque, and potential damage to both the motor and the inverter if operation continues.

• Open circuit in one of the motor phases (U, V, W) due to a broken wire or connection.
• Loose or corroded connection at the drive's output terminals (e.g., U, V, W) or motor terminal box.
• Motor winding failure (e.g., open circuit in one phase winding).
• Faulty motor contactor or output reactor if present between drive and motor.
• Internal failure of the drive's output stage (e.g., one IGBT leg failed open).

Click steps to track your progress.

1. 1

   De-energize the drive and disconnect the motor cables (U, V, W) from the drive's output terminals.

2. 2

   Measure the resistance between each pair of motor phase terminals (e.g., U-V, V-W, W-U) directly at the motor, ensuring readings are balanced and within specification.

3. 3

   Check continuity of each motor cable conductor (e.g., U, V, W) from the drive end to the motor terminal box using a multimeter.

4. 4

   Inspect and tighten all connections at the drive output terminals (e.g., U, V, W) and the motor terminal box.

5. 5

   If an output contactor or reactor is used, bypass it temporarily for testing or measure its phase resistances/continuity.