YASKAWA ELECTRIC
TOBP C730600 63C V1000 Option SI-ET3/V Installation Manual
33
7 Troubleshooting
7
Troubleshooting
u
Drive-Side Error Codes
Drive-side error codes appear on the drive keypad.
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 digital operator.
n
Faults
Both bUS (Option Communication Error) and EF0 (Option Card External Fault from the
option) can appear as an alarm or as a fault. When a fault occurs, the digital operator ALM
LED remains lit. When an alarm occurs, the ALM LED flashes.
If communication stops while the drive is running, use the following questions as a guide 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 9 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).
The option is not properly connected
to the drive
Reinstall the option
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