CPU Detected Fault

What does InFE mean?

A CPU detected fault, indicating an internal error related to RAM, Flash memory, or task execution within the drive's central processing unit. This is a critical internal fault that will prevent the drive from functioning at all and requires immediate attention.

• Corrupted firmware due to an interrupted update process or memory write error in Flash memory.
• Hardware fault in the CPU, RAM, or Flash memory components on the drive's main control board.
• Electromagnetic interference (EMI) causing transient data corruption during CPU task execution.
• Power supply instability on the control board (e.g., 5VDC or 3.3VDC rail fluctuations) affecting CPU operation.

Click steps to track your progress.

1. 1

   Cycle power to the drive and observe if the fault clears; verify stable input voltage (L1, L2, L3) during power-up using a voltmeter.

2. 2

   Attempt to re-initialize the drive to factory default parameters (e.g., using Parameter P0-01 = 1) and then reconfigure settings.

3. 3

   Check the drive's internal DC bus voltage (e.g., terminals DC+ and DC-) for stability and ripple content with an oscilloscope.

4. 4

   If the fault persists after re-initialization, the control board or the entire drive unit requires replacement.