Cause : Parameter write error comes when parameter copy from the operation panel to the inverter was attempted during operation.

1. A failure has occurred at the operation panel side EEPROM while writing the copied parameters. 
2. A failure has occurred in the USB memory device while writing the copied parameters or PLC function project data.
3. Check that the inverter is stopped.
4. After stopping the operation, perform parameter copy again.
5. The operation panel (FR-DU08) may be faulty.
6. Perform parameter copy or PLC project data copy again.
7. The USB memory device may be faulty. Replace the USB memory device.