H07

What does 107 mean?

An internal fault related to the power stage has occurred. During the initialisation of the controller, an incorrect power stage was detected, indicating a serious internal hardware issue.

• Internal power stage component failure (e.g., IGBT module, gate driver circuit) due to overstress or manufacturing defect.
• Internal communication bus error between the control board and power board during the drive's boot-up sequence.
• Faulty or corrupted power stage identification hardware (e.g., EEPROM, configuration resistors) preventing correct recognition.
• Transient voltage event or brownout during controller initialization causing an incorrect detection of the installed power stage.

Click steps to track your progress.

1. 1

   1. Power cycle the drive and observe if the internal fault clears upon re-initialization.

2. 2

   2. Measure incoming AC line voltage (L1, L2, L3 or L, N) at the drive's input terminals and confirm it is within specified tolerance (e.g., 380-480VAC +/-10%).

3. 3

   3. Disconnect the motor and any external braking resistor from the drive. Power cycle the drive and check if the fault persists (to isolate external loads).

4. 4

   4. If the drive is modular, ensure all internal power and control module connections are securely seated.

5. 5

   5. Contact the drive manufacturer's technical support, providing the exact fault code and drive serial number for internal component diagnosis.