5.2
Fault Detection
u
Fault Displays, Causes, and Possible Solutions
Table 5.2 Detailed Fault Displays, Causes, and Possible Solutions
LED Operator Display
Fault Name
bUS
Option Communication Error
• After establishing initial communication, the connection was lost.
• Only detected when the run command frequency reference is assigned to an
option card.
Cause
Possible Solution
No signal received from the PLC. • Check for faulty wiring.
• Correct the wiring.
• Check for loose wiring and short circuits. Repair as needed.
The communication cable is faulty
or a short circuit exists.
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.
• Ensure that other equipment such as switches or relays do not cause noise and
use surge suppressors if required.
• Use cables recommended by Yaskawa or another type of shielded line. Ground
the shield on the controller side or on the drive input power side.
• Separate all wiring for communications devices from drive input power lines.
Install an EMC noise filter to the input side of the drive input power.
The option card is damaged.
• Replace the option card if there are no problems with the wiring and the error
continues to occur.
The option card is not properly
connected to the drive.
• The connector pins on the option card are not properly lined up with the
connector pins on the drive.
• Reinstall the option card.
CE
MEMOBUS/Modbus Communication Error
Control data was not received for the CE detection time set to H5-09.
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.
5.2 Fault Detection
YASKAWA ELECTRIC TOEP C710606 47A YASKAWA AC Drive – V1000 Quick Start Guide
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5
Troubleshooting
