Troubleshooting - YASKAWA V1000 Installation Manual

11

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 digital operator.
Faults
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Both bUS (option communication error) and EF0 (Option Card External Fault) 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 12 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.
YASKAWA ELECTRIC TOBP C730600 60C V1000 Option SI-EN3/V Installation Manual
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.
• 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).
11 Troubleshooting
Table 12 lists causes of the errors and
Fault Name
Possible Solution
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