Cause : CPU error comes when a problem with the drive's central processing unit (CPU). This is a serious issue that usually requires professional intervention.

"er3" fault in Fuji FRENIC-VG drive indicate "CPU error". This means a problem with the drive's central processing unit (CPU), which is critical for controlling and managing the drive's operations. A CPU error is serious and usually means that the drive is unable to function properly.

Troubleshooting Steps:

1. Power Cycle the Drive:

   • Turn off the drive, wait a few minutes, and then power it back on. Sometimes, a simple reset can temporarily clear the error.

2. Check for Overheating:

   • Ensure that the drive is operating within the recommended temperature range.
   • Check the ventilation around the drive and ensure that cooling fans are working properly and are not obstructed.

3. Inspect Power Supply:

   • Verify that the drive is receiving stable power within the specified voltage range. Check for any signs of power supply issues, such as flickering LEDs or other abnormalities.

4. Update or Reinstall Firmware:

   • If possible, try updating the drive’s firmware to the latest version. Follow the manufacturer’s instructions carefully to avoid further issues.
   • If the firmware is suspected to be corrupted, you may need to reinstall the current version.

5. Check for External Interference:

   • Ensure that the drive and its control circuitry are properly shielded from electrical noise and interference from other equipment.
   • Verify that all grounding connections are secure.

6. Inspect the Control Board:

   • If you have experience with electronics, you can carefully inspect the control board for any visible signs of damage, such as burnt components or loose connections. If any damage is found, the control board may need to be repaired or replaced.