5.4 Fault Detection
u
Fault Displays, Causes and Possible Solutions
Table 5.7 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.
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.
5.4 Fault Detection
YASKAWA ELECTRIC TOEP C710606 25D YASKAWA AC Drive J1000 Installation & Start-Up Manual
137
5
Troubleshooting
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