Internal fault

What does #38 mean?

An internal fault has been detected within the drive itself, indicating a potential hardware or software malfunction that prevents the drive from operating correctly. This type of fault requires internal diagnosis and, if left unresolved, risks further damage to the drive or complete system failure.

• Failure of an internal power component (e.g., IGBT module, rectifier diode, switching transistor) within the drive's power stage.
• Malfunction of the internal control board (e.g., CPU, DSP) or its associated memory due to data corruption or hardware defect.
• Defective internal sensor (e.g., DC bus voltage sensor, current transducer) providing incorrect feedback to the drive's control logic.
• Overheating of internal components due to clogged cooling fins, fan failure, or ambient temperature exceeding specified limits (e.g., 50°C).
• Software or firmware corruption within the drive requiring a reflash or replacement of the control board.

Click steps to track your progress.

1. 1

   Record the exact fault code and any sub-codes displayed on the drive's HMI for detailed troubleshooting using the drive's service manual.

2. 2

   Perform a visual inspection of the drive's internal components (after power isolation and DC bus discharge) for signs of burning, leaking capacitors, or physical damage.

3. 3

   Verify that the drive's cooling fan(s) are operating correctly and that heatsink fins are free from dust or obstructions, ensuring proper airflow.

4. 4

   Measure the ambient temperature around the drive enclosure using a thermometer to ensure it is within the manufacturer's specified operating range.

5. 5

   Check for any recent firmware updates or parameter changes that might have inadvertently triggered the internal fault condition.

6. 6

   If all external checks are inconclusive, perform a factory reset (if supported by the drive and all parameters are backed up) to rule out software corruption.