Phase W to Gnd

What does F40 mean?

A grounded phase condition has been detected specifically on motor phase W or in the wiring connecting drive output terminal W to the motor. This indicates a direct short path to ground.

• Phase W winding shorted to ground in the motor.
• Cable insulation failure between phase W and ground.
• Internal drive fault with phase W output stage.
• Grounding fault on phase W line conductor.

Click steps to track your progress.

1. 1

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

2. 2

   Measure insulation resistance between drive output terminal W and earth ground using a megger at 500VDC; expect a reading greater than 1 MΩ.

3. 3

   Measure insulation resistance between motor phase W and the motor frame using a megger at 500VDC; expect a reading greater than 1 MΩ.

4. 4

   Inspect the wiring connecting drive output terminal W and motor phase W for any physical damage or signs of insulation breakdown.