Phase VW Short

What does F43 mean?

A short circuit condition has been detected between motor phases V and W, or in the wiring connecting drive output terminals V and W to the motor. This indicates an unintended low-resistance path between these phases.

• Short circuit between phase V and phase W windings in the motor.
• Internal short circuit in the drive's output power module.
• Power cable damage causing conductors V and W to short.
• Incorrect motor connection or wiring error.

Click steps to track your progress.

1. 1

   Disconnect the motor from the drive output terminals (U, V, W).

2. 2

   Measure resistance between drive output terminals V and W with the motor disconnected; expect an open circuit (infinite resistance) if no internal drive fault.

3. 3

   Measure resistance between motor phases V and W; expect a low resistance reading (continuity across the motor winding).

4. 4

   Inspect the wiring between drive output terminals V, W and motor phases V, W for any physical damage or direct short circuits.