H07 (Internal fault (power stage))

What does 0107 mean?

During the controller's initialization phase, an incorrect power stage was detected. This implies a critical internal hardware mismatch or failure within the power electronics.

• Incorrect or incompatible power module installed in a modular drive system.
• Failure of internal power stage components (e.g., IGBTs, rectifiers) detected during self-test.
• Disconnection or poor contact between the control board and the power board.
• Internal sensor fault on the power stage (e.g., current sensor, voltage sensor) preventing correct identification.
• Manufacturing defect or significant physical damage to the power stage assembly.

Click steps to track your progress.

1. 1

   Perform a complete power cycle to the drive by disconnecting mains power for at least 60 seconds to allow all internal capacitors to discharge.

2. 2

   If the drive is modular, physically inspect the power module for proper seating and connection to the control unit.

3. 3

   Verify the drive's model number and series to ensure the correct power module (if replaceable) is installed for the control unit.

4. 4

   Visually inspect the power stage for signs of damage, such as burnt components, bulging capacitors, or discolored PCBs.

5. 5

   Measure the resistance of the motor phases (U, V, W) to ground and between phases with a megohmmeter (e.g., 500VDC) to rule out motor or cable insulation breakdown affecting power stage.