Output Voltage Detection Fault

What does voF mean?

A problem has been detected with the voltage on the output side of the drive, indicating internal hardware damage. This fault prevents the drive from operating correctly and consistently, requiring component replacement to restore full functionality.

• Failure of the output voltage sensing circuit components (e.g., voltage dividers, op-amps) on the main control board or power board.
• Damage to the IGBT power module, leading to abnormal voltage readings across one or more output phases (U, V, W).
• Internal short circuit between output phases or from an output phase to ground within the drive's power section.
• Main control board malfunction affecting the processing or interpretation of output voltage feedback signals.
• Transient overvoltage condition on the drive's output terminals exceeding the tolerance of the internal sensing hardware.

Click steps to track your progress.

1. 1

   Disconnect all motor leads (U, V, W) from the drive's output terminals. Power on the drive and attempt a run command without the motor connected.

2. 2

   Measure the resistance between each output terminal (U, V, W) and between each output terminal and ground using a megohmmeter (insulation tester) to detect short circuits or insulation breakdown.

3. 3

   Perform a visual inspection of the main control board and the power board for any burnt components, discolored traces, or signs of internal arcing.

4. 4

   Verify all internal ribbon cables connecting the control board to the power board are securely seated and free from damage.

5. 5

   If a spare main control board is available, replace it and retest the drive operation to isolate the fault to the control electronics.