Faults - YASKAWA CC-Link SI-C3 Installation Manual

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Faults

Both bUS [Option Communication Error] and EF0 [Option Card External Fault] can
appear as a fault. When a fault occurs, the keypad ALM LED stays lit. The ALM LED
also illuminates. When an alarm occurs, the ALM LED flashes.
If communication stops while the drive is running, answer these questions to help fix the
problem:
• Is the communication line properly connected to the option? Is it loose?
• Is the CC-Link communication cable properly connected to the option?
• Is the PLC program working? Is the controller/PLC CPU stopped?
• Did a momentary power loss interrupt communications?
Code Name
Option
bUS
Communication Error
YASKAWA TOEP C730600 83A CC-Link Installation Manual
Causes
The drive did not receive a
signal from the controller.
The communications cable
wiring is incorrect.
An existing short circuit or
communications disconnection
A data error occurred due to
electric interference
Option is damaged
Connection Time-out
Duplicate IP Address found on
network
9 Troubleshooting
Possible Solutions
• Check for wiring errors.
• Correct the wiring.
Check disconnected cables and short
circuits and repair as needed
• Prevent noise in the control circuit,
main circuit, and ground wiring.
• If you identify a magnetic contactor
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.
• Decrease the effects of electrical
interference from the controller.
If there are no problems with the wiring
and the error continues to occur, replace
the option.
Check if the CPU of the controller is not
stopped.
Change to a different IP address. If F7-
13 = 0 [Address Mode at Startup =
Static], change parameters F7-01 to F7-
04 [IP Address 1 to 4].
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