9 Troubleshooting
YASKAWA ELECTRIC SIEP C730600 59A V1000 Option Modbus TCP/IP Technical Manual 35
9 Troubleshooting
Drive-Side Error Codes
Drive-side error codes appear on the drive digital operator. Causes of the errors and corrective actions are listed in
Table 39. For additional error codes that may appear on the drive digital operator, refer to the drive Technical Manual.
Faults
Both bUS (Option communication error) and EF0 (External fault input 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 39 Fault Display 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 or frequency reference is assigned to the option
(b1-01 = 3 or b1-02 = 3)
Cause Possible Solution
Master controller (PLC) has stopped
communicating
• Check that power is supplied to the PLC
• Check that PLC is not in program mode
Communication cable is not connected properly
• Check for faulty wiring
• Correct any wiring problems
A data error occurred due to noise
• Check the various options available to minimize the effects of noise
• 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
• Make sure the cable used meets the Modbus TCP/IP requirements
• Make sure the option ground wire is connected between option FE terminal and the drive
ground terminal connected to earth ground
Option is damaged If there are no problems with the wiring and the error continues to occur, replace the option.
Control Connection Time-out.
• Option did not receive a command (write to Modbus address 01H) within the time-out period
specified in parameter F7-16
• Check value programmed in F7-16
• Check if PLC program stopped running
Duplicate IP Address
The option shares IP Address with at least one other node.
Check the setting value of F7-03 and F7-04.
LED 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 is being sent from the upper
controller (PLC)
• Remove the cause of the external fault
• Reset the external fault input from the PLC device
Problem with the PLC program Check the program used by the PLC and make the appropriate corrections.
LED Operator Display Fault Name
oFA00
Option Card Fault
Option is not properly connected.
Cause Possible Solution
Non-compatible option connected to the drive Connect an option that is compatible with the drive.
Modbus_conditional_E.fm 35 ページ ２０１２年３月７日 水曜日 午前１１時３１分
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