Load inertia is too big
• Adjust the deceleration time (C1-02, -04, -06, -08).
• Set the frequency to the minimum value and interrupt the Run command when the drive finishes
decelerating.
Digital Operator Display Fault Name
or
CPF11 to CPF14
CPF16 to CPF19
Control Circuit Error
Cause Possible Solution
There is a self diagnostic error in control
circuit
• Cycle power to the drive.
• If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
Connector on the operator is damaged Replace the operator.
Digital Operator Display Fault Name
CPF02
A/D Conversion Error
An A/D conversion error or control circuit error occurred.
Cause Possible Solution
Control circuit is damaged
• Cycle power to the drive.
• If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
Digital Operator Display Fault Name
CPF03
Control Board Connection Error
Connection error between the control board and the drive
Cause Possible Solution
There is a connection error
• Turn off the power and check the connection between the control board and the drive.
• If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
Drive fails to operate properly due to noise
interference
• Check the various options available to minimize the effects of noise.
• Counteract noise in the control circuit, main circuit, and ground wiring.
• Use only recommended cables or other shielded line. Ground the shield on the controller side or the
drive input power side.
• Ensure that other equipment such as switches or relays do not cause noise. Use surge suppressors if
required.
• Separate all communication wiring from drive power lines. Install an EMC noise filter to the drive
power supply input.
Digital Operator Display Fault Name
CPF06
EEPROM Memory Data Error
An error in the data saved to EEPROM
Cause Possible Solution
There is an error in EEPROM control circuit
• Turn off the power and check the connection between the control board and the drive.
• If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
The power supply was switched off while
parameters were being saved to the drive
Reinitialize the drive (A1-03).
Digital Operator Display Fault Name
CPF07
Terminal Board Connection Error
CPF08
Cause Possible Solution
There is a faulty connection between the
terminal board and control board
• Turn off the power and check the connection between the control board and the drive.
• If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
Digital Operator Display Fault Name
or
CPF20 or CPF21 Control Circuit Error
Cause Possible Solution
Hardware is damaged
• Cycle power to the drive.
• If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa
representative for instructions on replacing the control board.
6.4 Fault Detection
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
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Troubleshooting
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