Internal fault (Specific range)

What does 5376–6231 mean?

A general internal fault has occurred within a specific range of internal error codes. This indicates an unspecified internal hardware or software malfunction that requires specialized attention.

• Corrupted firmware on the control board or a specific option module (e.g., due to power fluctuation during update).
• Malfunction of internal power supply components on the control board or power board.
• Critical sensor failure or out-of-range reading on an internal component (e.g., DSP temperature).
• Data integrity error within internal memory (RAM/ROM) of the drive's CPU.
• Electromagnetic interference (EMI) disrupting internal communication buses (e.g., CAN bus) within the drive.

Click steps to track your progress.

1. 1

   Record the full fault code (e.g., 5376, 5377) and contact technical support with the drive's serial number and firmware version.

2. 2

   Power cycle the frequency converter by switching off the main supply for at least 60 seconds.

3. 3

   Verify input voltage (e.g., L1-L2, L2-L3, L3-L1) is stable and within nameplate specifications (e.g., 400V +/-10%).

4. 4

   Check for loose connections on all internal ribbon cables and power connectors within the drive.

5. 5

   Attempt a factory reset of the drive parameters (e.g., using parameter 14-22, depending on drive model) after backing up current settings.