10 Troubleshooting
YASKAWA ELECTRIC
SIEP C730600 89C YASKAWA AC Drive Option SI-EP3 Technical Manual
51
10
Troubleshooting
Drive-Side Error Codes
Drive-side error codes appear on the drive keypad.
lists causes of the errors and possible corrective actions.
Refer to the drive Technical Manual for additional error codes that may appear on the drive keypad.
Faults
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 30 Fault Displays, Causes, and Possible Solutions
Keypad Display
Fault Name
bUS
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).
Cause
Possible Solution
No signal was received from the PLC.
• Check for faulty wiring.
• Correct any wiring problems.
Faulty communications wiring.
An existing short circuit or
communications disconnection.
Check disconnected cables and short circuits and repair as needed.
A data error occurred due to electric
interference.
• 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).
The option is not properly connected to
the drive.
Reinstall the option.
Option is damaged.
If there are no problems with the wiring and the error continues to occur, replace the option.
Keypad Display
Fault Name
EF0
Option Card External Fault
The alarm function for an external device has been triggered.
Cause
Possible Solution
An external fault was received from the
PLC.
1. Remove the cause of the external fault.
2. Reset the external fault input from the PLC.
Problem with the PLC program.
Check the PLC program.
Keypad Display
Fault Name
oFA00
Option Card Connection Error (CN5-A)
Option is not properly connected.
Cause
Possible Solution
The option card installed into port
CN5-A is incompatible with the drive.
Connect the option to the correct option port.
Note: PG option cards are supported by option ports CN5-B and CN5-C only.
Keypad Display
Fault Name
oFA01
Option Card Fault (CN5-A)
Option is not properly connected.
Cause
Possible Solution
The option connected to option port
CN5-A was changed during run.
De-energize the drive and plug the option into the drive according to
Installation Procedure on page 12
.
