Internal fault

What does Internal fault mean?

This alarm indicates an unspecified internal hardware or software fault within the adjustable frequency drive. It suggests a critical internal failure that prevents normal operation and often requires professional diagnosis or replacement.

• Power supply board failure within the drive, affecting internal control voltage rails (e.g., 24VDC, 5VDC).
• Control board malfunction, including processor errors, memory corruption, or watchdog timer failures.
• Faulty or damaged IGBT power modules within the drive's inverter section.
• Sensor malfunction (e.g., current sensor, voltage sensor, temperature sensor) providing incorrect feedback to the control board.
• Corrupted firmware or configuration file, preventing proper drive initialization or operation.

Click steps to track your progress.

1. 1

   Record the specific numerical sub-code or error message (if any) displayed with 'Internal fault' for further diagnosis.

2. 2

   Completely power cycle the drive by disconnecting AC input power for at least 5 minutes to allow all internal capacitors to discharge.

3. 3

   Inspect the drive's internal components for any visible signs of damage, burn marks, leaking capacitors, or loose connections.

4. 4

   Verify that the internal control voltage rails (if accessible and safe to measure) are within specification using a multimeter.

5. 5

   Attempt to restore the drive to its factory default parameters (P0-01 = 1) and then re-enter essential motor and application parameters.

6. 6

   If the fault persists, prepare the drive for replacement or contact the manufacturer's technical support with the recorded fault code and any sub-codes.