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YASKAWA ELECTRIC
TOBP C730600 83C YASKAWA AC Drive Option SI-C3 Installation Manual
9 Troubleshooting
9
Troubleshooting
u
Drive-Side Error Codes
Drive-side error codes appear on the drive keypad.
Table 18
lists causes of the errors and
possible corrective actions. Refer to the drive Technical Manual for additional error codes
that may appear on the drive keypad.
n
Faults
Both bUS (CC-Link Option Communication Error) and EF0 (Option Card External Fault
from the CC-Link Option) can appear as an alarm or as a fault. When a fault occurs, the
keypad ALM LED remains. When an alarm occurs, the keypad ALM LED flashes.
If communication stops while the drive is running, answer the following questions to help
remedy the fault:
• Is the option properly installed?
• Is the communication line properly connected to the option? Is it loose?
• Is the controller program working? Has the controller/PLC CPU stopped?
• Did a momentary power loss interrupt communications?
Table 18 Fault Display and Possible Solutions
Keypad Display
Fault Name
bUS
Option Communication Error
• After establishing initial communication, the connection was lost.
• Only detected when the run command or frequency reference is assigned to the
option (b1-01 = 3 or b1-02 = 3).
Cause
Possible Solution
No signal was received from
the PLC.
• Check for faulty wiring.
• Correct any wiring problems.
Faulty communications
wiring
An existing short circuit or
communications
disconnection
Check disconnected cables and short circuits and repair as needed.
A data error occurred due to
electric interference.
• Counteract noise in the control circuit, main circuit, and ground wiring.
• If a magnetic contactor is identified as a source of noise, install a surge absorber to
the contactor coil.
• Use only recommended cables or other shielded line. Ground the shield on the
controller side or the drive input power side.
• Separate all communication wiring from drive power lines. Install an EMC noise
filter to the drive power supply input.
• Counteract noise in the master controller (PLC).
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