
60
YASKAWA ELECTRIC
SIEP C730600 92A YASKAWA AC Drive Option SI-EN3 Technical Manual
13 Troubleshooting
13
Troubleshooting
Drive-Side Error Codes
Drive-side error codes appear on the drive digital operator.
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.
Faults
Both bUS (Option Communication Error) and EF0 (Option Card External Fault) 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 15 Fault Display and Possible Solutions
Digital Operator 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.
Option is damaged.
If there are no problems with the wiring and the error continues to occur, replace the option.
Connection Time-out
The option Requested Packet Interval (RPI) timer timed out
Duplicate IP Address
Check if the option shares IP Address with at least one other node.
Check the setting values of F7-01 to F7-04 (IP Address).
Digital Operator Display
Fault Name
EF0
Option Card External Fault
The alarm function for an external device has been triggered.
Cause
Corrective Action
An external fault was received from the PLC.
1. Remove the cause of the external fault.
2. Reset the external fault input from the PLC.
Problem with the PLC program
Check the PLC program.
PLC is in the Idle Mode.
1. Set the PLC to the Run Mode
2. Set the parameter F6-54 = 0 (Enabled) to ignore errors while the PLC is in the Idle Mode.
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