10 Troubleshooting
YASKAWA
SIEP YEACOM 07A 1000-Series Option PROFINET SI-EP3 Technical Manual
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10
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
. For additional error codes that may appear on the drive digital operator, refer to the drive Technical Manual.
Faults
Both bUS (SI-EP3 option communication error) and EF0 (External fault input from the SI-EP3 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 30 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 PROFINET 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.
LED Operator Display
Fault Name
EF0
External fault input from option.
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.
