6.4 Fault Detectionu Fault Displays, Causes and Possible SolutionsTable 6.7 Detailed Fault Displays, Causes and Possible SolutionsLED Operator Display Fault NameCE MEMOBUS/Modbus Communication ErrorNo data was received for longer than 2 seconds.Cause Possible SolutionFaulty communications wiring, or a shortcircuit exists.• Check for faulty wiring.• Correct the wiring.• Check for loose wiring and short circuits. Repair as needed.A communications data error occurred due tonoise.• Check the various options available to minimize the effects of noise.• Counteract noise in control circuit, main circuit, and ground wiring.• Use Yaskawa-recommended cables, or another type of shielded line. Ground the shield on the controllerside or on the drive input power side.• Ensure that other equipment such as switches or relays do not cause noise and use surge suppressorsif required.• Separate all wiring for communications devices from drive input power lines. Install a noise filter tothe input side of the drive input power.LED Operator Display Fault NameCoFCurrent Offset FaultThe current sensor is damaged or there was residual current in the motor (e.g., during sudden accelerationor when coasting) when the drive attempted to start the motor.Cause Possible SolutionDue to residual induction current in the motorwhen the drive attempted to start the motor,the drive tried to adjust the current offset valuebeyond the allowable range.Create a motor restart sequence that allows enough time for residual induction voltage to dissipate.LED Operator Display Fault Nameor CPF00 or CPF01CPF11 – RAM FaultCPF12 – Problem with the ROM (FLASH memory)CPF14 – CPU error (CPU operates incorrectly due to noise, etc.)CPF17 – A timing error occurred during an internal processCPF18 – CPU error (CPU operates incorrectly due to noise, etc.)Cause Possible SolutionHardware is damaged. Replace the drive.LED Operator Display Fault NameCPF02 A/D Conversion ErrorAn A/D conversion error occurred.Cause Possible SolutionControl circuit is damaged. Cycle power to the drive. If the problem continues, replace the drive.Control circuit terminals have shorted out (+V,AC).• Check for wiring errors along the control circuit terminals.• Correct the wiring.Check the resistance of the speed potentiometer and related wiring.Control terminal input current has exceededallowable levels.• Check the input current.• Reduce the current input to control circuit terminal (+V) to 20 mA.LED Operator Display Fault NameCPF06 EEPROM Data ErrorThere is an error in the data saved to EEPROM.Cause Possible SolutionControl circuit is damaged. Cycle power to the drive. If the problem continues, replace the drive.The power supply was switched off whenparameters were written (e.g., using an optionunit).• Cycle power to the drive and check operation again.• Initialize the drive using A1-03.• If the problem continues, replace the drive.6.4 Fault DetectionYASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual 1336 Troubleshootinghttp://nicontrols.com
