CPU fault

What does E.CPU mean?

This fault indicates an internal error within the FR-A800/A800 Plus Series drive's central processing unit. This is a critical fault for controlling all drive operations and typically points to a severe internal hardware or firmware issue.

• Internal hardware malfunction of the CPU or its associated circuitry.
• Firmware corruption or an unhandled software exception within the drive's operating system.
• Severe electrical noise or electromagnetic interference (EMI) affecting the control board.
• Power supply instability to the control circuit of the drive.
• Overheating of the control board components beyond their specified limits.

Click steps to track your progress.

1. 1

   Perform a power cycle of the FR-A800/A800 Plus Series drive by completely removing and reapplying main and control power after a few minutes (e.g., 5 minutes).

2. 2

   Verify the stability of the control circuit power supply (e.g., 24VDC at terminal +24).

3. 3

   Check for any signs of physical damage, burn marks, or overheating on the control circuit board.

4. 4

   Ensure proper grounding of the FR-A800/A800 Plus Series drive and shield any control cables to minimize electrical noise interference.

5. 5

   If the fault persists after power cycling and environmental checks, it indicates an internal hardware failure, and the drive may require replacement.