Troubleshooting - YASKAWA 1000 Series Installation Manual

8

Troubleshooting

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Drive-Side Error Codes
Table 13 lists the various fault codes related to the option. Further details on various faults
can be found in the drive Technical Manual.
Faults
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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
• Operation status of the controller program and controller CPU
• Did a momentary power loss interrupt communications?
Table 13 Fault Displays, Causes, and Possible Solutions
Digital Operator Display
bUS
Cause
Master controller (PLC) has
stopped communicating.
Communication cable is not
connected properly.
A data error occurred due to
noise.
Option is damaged.
Digital Operator Display
EF0
Cause
An external fault is being sent
from the main controller (PLC).
Problem with the PLC program. Check the program used by the PLC and make the appropriate corrections.
YASKAWA ELECTRIC TOBP C730600 42D 1000-Series Option SI-P3 Installation Manual
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).
Check for faulty wiring.
Correct any wiring problems.
• Counteract noise in 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 cables recommended by Yaskawa or another type of shielded line. Ground
the shield on the controller side and on the option side.
If there are no wiring problems and the error continues to occur, replace the option.
External Fault Input from the option
The alarm function for an external device has been triggered.
• Remove the cause of the external fault.
• Reset the external fault input from the PLC device.
8 Troubleshooting
Fault Name
Possible Solution
Fault Name
Possible Solution
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