YASKAWA LonWorks SI-W3, Installation Manual, Page: 34 / 80

34 YASKAWA ELECTRIC TOBP C730600 56A 1000-Series Option SI-W3 Installation Guide
9 Troubleshooting
9 Troubleshooting
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Drive-Side Error Codes
Table 6 lists the various option-related fault codes. Refer to the drive Technical Manual for
further information about fault codes.
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Faults
Both bUS (Option Communication Error) and EF0 (External Fault Input from the option)
can appear as either an alarm or as a fault. When a fault occurs, the digital operator ALM
LED remains lit. When an alarm occurs, the digital operator ALM LED flashes.
Check the following items first when an error code occurs on the drive:
• Communication cable connections
• Make sure the option is properly installed to the drive
• Did a momentary power loss interrupt communications?
Table 6 Fault Displays, Causes, and Possible Solutions
Digital Operator Display Fault Name
bUS
Option Communication Error
The connection was lost after establishing initial communication.
Only detected when the run command frequency reference is assigned to
the option
(bl-01 = 3 or bl-02 = 3).
Cause Possible Solution
Network has stopped communicating
Check for faulty wiring.
Correct any wiring problems.
Communication cable is not connected
properly
A data error occurred due to noise
• Counteract noise in the control circuit wiring, main circuit lines, and
ground wiring.
• If a magnetic contactor is the noise source, install a surge absorber to the
contactor coil.
• Use only the LONWORKS network cables.
Ground the shield on the controller side and on the option side.
Option is damaged
If there are no wiring problems and the fault continues to occur, replace
the option.
Connection timeout
The option Receive Heart Beat timer timed out.
Make sure that Receive Heart Beat time is set properly.
Check the option connection and communication signal.
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