YASKAWA Powerlink A1000 Series Installation Manual page 29

 Drive-Side Error Codes
Drive-side error codes appear on the drive's digital operator. Causes of the errors and
corrective actions are listed in
the technical manual for the drive.
The bUS (Powerlink Option Communication Error) and EF0 (External Fault Input from the
Powerlink Option) may appear as an alarm or a fault. If they occur as an alarm, the "ALM"
LED on the drive digital operator will blink and the alarm code will flash in the display.
When these occur as a fault, the "ALM" LED will light and the display will show the fault
code.
If communication stops while the drive is running, check the following items:
• Is the Powerlink Option properly installed?
• Is the communication line properly connected to the Powerlink Option? Is it loose?
• Is the controller program working? Has the controller CPU stopped?
• Did a momentary power loss interrupt communications?
 Faults
Table E.10 lists possible faults when using a communication option. The drive's fault
contact will close if one of these faults occur.
Table E.10 Fault Display and Possible Solutions
Digital Operator Display
Cause
Master controller (PLC) has stopped
communicating.
Communication cable is not connected
properly.
A data error occurred due to noise.
Powerlink Option is damaged.
A Powerlink state transition from

OP PRE_OP_1 was made when the drive
was in OPERATION enabled.
YASKAWA Europe YEU TOEP C710616 87A - A1000 Option Powerlink - Installation Manual
9 Fault Diagnosis and Possible Solutions
Table E.10 and
Powerlink Option Communication Error
After establishing initial communication, the connection was lost.
bUS
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 the various options available to minimize the effects of noise.
Take steps to counteract noise in the control circuit wiring, main circuit
lines, and ground wiring.
If a magnetic contactor is identified as a source of noise, install a surge
absorber to the contactor coil.
Make sure the cable used fulfills the Powerlink requirements. Ground
the shield on the controller side and on the Powerlink Option side.
If there are no problems with the wiring and the error continues to
occur, replace the Powerlink Option.
Check and correct state machine transitions in control word.
Table E.8. For additional error codes, refer to
Fault Name
Possible Solution
EN 29