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7
Troubleshooting
◆
Drive-Side Error Codes
Table 10
lists the various option-related fault codes. Refer to the drive Technical Manual for
further information about fault codes.
Faults
■
Both bUS (Option Communication Error) and EF0 (External Fault Input from the Option)
can appear either as 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
• Operation status of the master program and master CPU
• Did a momentary power loss interrupt communications?
Table 10 Fault Displays, Causes, and Possible Solutions
Digital Operator Display
Cause
Master has stopped communicating.
Communication cable is not connected
properly.
A data error occurred due to noise.
Option is damaged.
Connection timeout
Duplicate MAC ID
YASKAWA ELECTRIC TOBP C730600 54A V1000 Option CompoNet Installation Manual
Option Communication Error
After establishing initial communication, the connection was lost.
bUS
Only detected when the run command frequency reference is assigned to the
option (bl-01 = 3 or bl-02 = 3).
Check for faulty wiring.
Correct any wiring problems.
Check the various options available to minimize the effects of noise.
Counteract noise in the control circuit wiring, main circuit lines, and ground
wiring.
If a magnetic contactor is the source of noise, install a surge absorber to the
contactor coil.
Make sure the cable used fulfills the CompoNet requirements.
If there are no problems with the wiring and the error continues to occur,
replace the option.
The option Expected Packet Rate (EPR) timer timed out.
Make sure that EPR time is set properly.
The option MAC ID and at least one other mode have the same MAC ID.
Verify F6-40 is set properly.
7 Troubleshooting
Fault Name
Possible Solution
31
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