Sigma-II Series SGM*H/SGDH USER'S MANUAL - Esco Drives ...

10.1 TroubleshootingTable 10.6 Alarm Display and Troubleshooting (Cont’d)AlarmDisplayAlarm NameSituation at AlarmOccurrenceCauseCorrective ActionsA.bFSystem Alarm(Program error)• Software operationtimeexceeded• Stack overflow• Micro programerrorOccurred when thecontrol power supplywas turned ON.Occurred duringnormal operation.A SERVOPACK board fault occurred.A program is incorrect.A SERVOPACK board fault occurred.Replace the SERVOPACK.Replace the SERVOPACK. (Contact yourYaskawa representative.)Replace the SERVOPACK.A.C1Servo OverrunDetected(Detected whenthe servo is ON.)Occurred when thecontrol power supplywas turned ON.Occurred when theservo was ON or areference was input.A SERVOPACK board fault occurred.The order of phase U, V, and W in the servomotorwiring is incorrect.An encoder fault occurred.Replace the SERVOPACK.Correct the servomotor wiring.Replace the servomotor.A SERVOPACK fault occurred.Replace the SERVOPACK.A.C8AbsoluteEncoder ClearError and MultiturnLimit SettingErrorOccurred when thecontrol power supplywas turned ON.Occurred when anencoder alarm wascleared and reset.An encoder fault occurred.A SERVOPACK board fault occurred.An encoder fault occurred.A SERVOPACK board fault occurred.Replace the servomotor.Replace the SERVOPACK.Replace the servomotor.Replace the SERVOPACK.A.C9EncoderCommunicationsErrorOccurred when thecontrol power supplywas turned ONor during operation.The encoder wiring and the contact are incorrect.Noise interference occurred due to incorrect encodercable specifications.Correct the encoder wiring.Use tinned annealed copper twisted-pair ortwisted-pair shielded wire with a core of at least0.12 mm 2 (0.0002 in 2 ).Noise interference occurred because the wiring distancefor the encoder cable is too long.The wiring distance must be 20m (65.6 ft) max.The noise interference occurred on the signal linebecause the encoder cable is bent and the sheath isdamaged.Correct the encoder cable layout.The encoder cable is bundled with a high-currentline or near a high-current line.Correct the encoder cable layout so that no surgeis applied.The FG electrical potential varies because of theinfluence from such machines on the servomotorside as welders.Ground the machine separately from PG side FG.Noise interference occurred on the signal line fromthe encoder.Take a measure against noise for the encoder wiring.Excessive vibration and shocks were applied to theencoder.Reduce the machine vibration or mount the servomotorsecurely.An encoder fault occurred.Replace the servomotor.A SERVOPACK board fault occurred.Replace the SERVOPACK.A.CAEncoderParameterErrorOccurred when thecontrol power supplywas turned ON.An encoder fault occurred.A SERVOPACK board fault occurred.Replace the servomotor.Replace the SERVOPACK.1010-13