6.4 Fault Detection
u
Fault Displays, Causes and Possible Solutions
Table 6.7 Detailed Fault Displays, Causes and Possible Solutions
LED Operator Display Fault Name
CE
MEMOBUS/Modbus Communication Error
No data was received for longer than 2 seconds.
Cause Possible Solution
Faulty communications wiring, or a short
circuit exists.
• Check for faulty wiring.
•
Correct the wiring.
• Check for loose wiring and short circuits. Repair as needed.
A communications data error occurred due to
noise.
• 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 controller
side or on the drive input power side.
• Ensure that other equipment such as switches or relays do not cause noise and use surge suppressors
if required.
• Separate all wiring for communications devices from drive input power lines. Install a noise filter to
the input side of the drive input power.
LED Operator Display Fault Name
CoF
Current Offset Fault
The current sensor is damaged or there was residual current in the motor (e.g., during sudden acceleration
or when coasting) when the drive attempted to start the motor.
Cause Possible Solution
Due to residual induction current in the motor
when the drive attempted to start the motor,
the
drive tried to adjust the current offset value
beyond the allowable range.
Create a motor restart sequence that allows enough time for residual induction voltage to dissipate.
LED Operator Display Fault Name
or
CPF00 or CPF01
CPF11 – RAM Fault
CPF12 – Problem with the ROM (FLASH memory)
CPF14 – CPU error (CPU operates incorrectly due to noise, etc.)
CPF17 – A timing error occurred during an internal process
CPF18 – CPU error (CPU operates incorrectly due to noise, etc.)
Cause Possible Solution
Hardware is damaged. Replace the drive.
LED Operator Display Fault Name
CPF02
A/D Conversion Error
An A/D conversion error occurred.
Cause Possible Solution
Control 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 exceeded
allowable levels.
• Check the input current.
• Reduce the current input to control circuit terminal (+V) to 20 mA.
LED Operator Display Fault Name
CPF06
EEPROM Data Error
There is an error in the data saved to EEPROM.
Cause Possible Solution
Control circuit is damaged. Cycle power to the drive. If the problem continues, replace the drive.
The power supply was switched off when
parameters
were written (e.g., using an option
unit).
• 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 Detection
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual
133
6
Troubleshooting
http://nicontrols.com
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