Troubleshooting - YASKAWA SI-N3 Installation Manual

8

Troubleshooting

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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
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Both bUS (Option Communication Error) and EF0 (Option Card External Fault) can appear
as either an alarm or as a fault. When a fault occurs, the keypad ALM LED remains lit.
When an alarm occurs, the keypad 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 controller program and controller CPU.
• Did a momentary power loss interrupt communications?
Table 10 Fault Displays, Causes, and Possible Solutions
Keypad Display
bUS
Cause
No signal was received from
the PLC.
Faulty communications
wiring.
An existing short circuit or
communications
disconnection.
A data error occurred due to
electric interference.
The option is not properly
connected to the drive.
YASKAWA ELECTRIC TOBP C730600 84D YASKAWA AC Drive Option SI-N3 Installation Manual
Option Communication Error
• After establishing initial communication, the connection was lost.
• 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 disconnected cables and short circuits and repair as needed.
• 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.
• Use only recommended cables or other shielded line. Ground the shield on the
controller side or the drive input power side.
• Separate all communication wiring from drive power lines. Install an EMC noise
filter to the drive power supply input.
• Counteract noise in the master controller (PLC).
Reinstall the option.
8 Troubleshooting
Table 10 lists causes of the errors and
Fault Name
Possible Solution
41