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7
Troubleshooting
u
Drive-Side Error Codes
Drive-side error codes appear on the drive keypad.
possible corrective actions. Refer to the drive Technical Manual for additional error codes
that may appear on the drive keypad.
Faults
n
Both bUS (Option Communication Error), E5 (MECHATROLINK Watchdog Timer Error),
and EF0 (Option Card External Fault from the MECHATROLINK-II Option) can appear as
an alarm or as a fault. Drive parameters can determine these responses between an alarm and
a fault. When a fault occurs, the keypad ALM LED remains. When an alarm occurs, the
keypad ALM LED flashes.
If communication stops while the drive is running, answer the following questions to help
remedy the fault:
• Is the MECHATROLINK-II Option properly installed?
• Is the communication line properly connected to the MECHATROLINK-II Option? Is it
loose?
• Is the PLC program working? Has the PLC CPU stopped?
• Did a momentary power loss interrupt communications?
Keypad Display
bUS
Cause
No signal was received from
the PLC.
Faulty communications
wiring
An existing short circuit or
communications
disconnection
YASKAWA ELECTRIC TOBP C730600 86F YASKAWA AC Drive Option SI-T3 Installation Manual
Table 7 Fault Display and Possible Solutions
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).
• Check for faulty wiring.
• Correct any wiring problems.
Check disconnected cables and short circuits and repair as needed.
7 Troubleshooting
Table 7
lists causes of the errors and
Fault Name
Possible Solution
35
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