CPF00 or CPF01, CPF11 - RAM Error, CPF12 - ROM (FLASH memory) Issue, CPF14 - CPU Error, CPF17 - Timing Error During an Internal Process, CPF18 - CPU Error:
    Possible Cause: Hardware is damaged.
    Possible Solution: Replace the drive.

CPF02 A/D Conversion Error:
Possible Cause: Control circuit is damaged.
Possible Solution: Turn the power of the drive off and on. If the problem persists, replace the drive.
Control circuit terminals short-circuited (+V, AC).
Check wiring errors along the control circuit terminals.
Correct the wiring.
Check the resistance of the speed potentiometer and related wiring.
Control terminal input current exceeded allowed levels.
Check the input current.
Reduce the input current to the control circuit terminal (+V) to 20 mA.

CPF06 EEPROM Data Error:
Possible Cause: Control circuit is damaged.
Possible Solution: Turn the power of the drive off and on. If the problem persists, replace the drive.
Power supply was turned off while parameters were being written (e.g., using an option unit).
Restart the drive (A1-03).

CPF08 EEPROM Communication Error:
Possible Cause: Control circuit is damaged.
Possible Solution: Turn the power of the drive off and on. If the problem persists, replace the drive.

CPF20 or CPF21:
One of the following errors occurred: RAM error, FLASH memory error, watchdog circuit exception, clock error.
RAM error.
FLASH memory error (ROM error).
Watchdog circuit exception (self-diagnosis error).
Clock error.

CPF22 A/D Conversion Error:
Possible Cause: Control circuit is damaged.
Possible Solution: Turn the power of the drive off and on. If the problem persists, replace the drive.

CPF23 PWM Feedback Error:
Possible Cause: Hardware is damaged.
Possible Solution: Replace the drive.

CPF24 Drive Capacity Signal Error:
Possible Cause: A non-existent capacity was entered. (Checked when the drive is turned on.)
Possible Solution: Replace the drive.

EF0 MEMOBUS/Modbus Communication External Error:
Possible Cause: An external error condition exists.
Possible Solution: Remove the external error cause. Remove the external error input from the PLC. If there is a problem in the PLC program, check the program and correct any issues.

EF1, EF2, EF3, EF4, EF5 (External Error - input terminal S1, S2, S3, S4, S5):
Possible Cause: An external device triggered an alarm function.
Possible Solution: Remove the external error cause and reset the error. If the wiring is incorrect, ensure that the signal lines are correctly connected to the terminals assigned for external error detection. If the setting of the multifunction contact inputs is incorrect, check that the unused terminals are set to 20 to 2F (External Error). Change the terminal settings.

Err EEPROM Writing Error:
Possible Cause: Data does not match the EEPROM being written to.
Possible Solution: Press the button. Correct the parameter settings. Turn the power of the drive off and on.

oC Overcurrent:
Possible Cause: Drive sensors detected an output current greater than the specified overcurrent level.
Possible Solution: The motor was damaged due to overheating or motor insulation was damaged. Check the insulation resistance. Replace the motor. One of the motor cables short-circuited or there is a grounding issue. Check the motor cables. Remove the short circuit and restart the drive. Check the resistance between the motor cables and the ground terminal. Replace damaged cables.

The load is too heavy:
Measure the current entering the motor.
If the current value exceeds the drive's nominal current, replace it with a drive of larger capacity.
Determine if there are sudden fluctuations in the current level.
Reduce the load or switch to a larger drive to avoid sudden changes in current levels.

Acceleration or deceleration times are too short:
Calculate the required torque during acceleration according to the load inertia and the determined acceleration time.
If the correct amount of torque cannot be set, make the following changes:
+ Increase the acceleration time (C1-01, -03).
+ Increase the S-curve characteristics (from C2-01 to C2-04).
+ Increase the drive's capacity.

The drive is trying to operate a special motor or a motor larger than the maximum size:
Check the motor capacity.
Ensure that the drive's nominal capacity is equal to or greater than the capacity rating on the motor's nameplate.

The magnetic contactor (MC) on the drive's output side opened or closed:
Set the operating sequence so that the MC does not engage while the drive is outputting current.

V/f setting is not working as expected:
Check the ratios between voltage and frequency.
Set parameters from E1-04 to E1-10 appropriately.
If the voltage is too high relative to the frequency, reduce the voltage.

Over torque compensation:
Check the amount of torque compensation.
With no speed loss and less current, reduce the torque compensation gain (C4-01).

The drive is not operating properly due to noise interference:
Review the possible solutions given for dealing with noise interference.
Review the section on dealing with noise interference and check the control circuit lines, main circuit lines, and grounding wiring.

Over excitation gain is set too high:
Check if an error occurred simultaneously with the over-excitation function.
Considering motor iron saturation, reduce the value of n3-13 (Over Excitation Deceleration Gain).

A run command was applied while the motor was in free run:
Program the Speed Search command input through one of the multifunction contact input terminals (H1-oo = "61" or "62").

The motor cable is too long:
Use a larger drive.