11.2 Alarm Displays11-11 Inspection, Maintenance, and Troubleshooting1111.2.3 Troubleshooting of the Servo Drive AlarmsWhen an error occurs in the servo drives, LEDs on the panel operator will light up. Refer to the followingtable to identify the cause of an alarm and the action to be taken.Contact your Yaskawa representative if the problem cannot be solved by the described corrective action.Alarm:Alarm Name Cause Investigative Actions Corrective ActionsA.020:Parameter ChecksumError(The parameter data inthe SERVOPACK isincorrect.)The power supply voltage sud-denly dropped. Measure the power supply voltage.Set the power supply voltage withinthe specified range, and initializethe parameter.The power supply went OFFwhile changing a parameter set-ting.Note the circumstances when thepower supply went OFF.Initialize the parameter and then setthe parameter again.The number of times that parame-ters were written exceeded thelimit.Check to see if the parameters werefrequently changed through the hostcontroller.The SERVOPACK may be faulty.Repair or replace the SERVO-PACK.Reconsider the method of writingparameters.Malfunction caused by noisefrom the AC power supply orgrounding line, static electricitynoise, etc.Turn the power supply ON and OFFseveral times. If the alarm stilloccurs, there may be noise interfer-ence.Take countermeasures againstnoise.Gas, water drops, or cutting oilentered the SERVOPACK andcaused failure of the internalcomponents.Check the installation conditions. The SERVOPACK may be faulty.Replace the SERVOPACK.SERVOPACK failureTurn the power supply ON and OFFseveral times. If the alarm stilloccurs, the SERVOPACK is faulty.The SERVOPACK may be faulty.Replace the SERVOPACK.A.021:Parameter FormatError(The data format of theparameter in the SER-VOPACK is incorrect.)The software version of SERVO-PACK that caused the alarm isolder than that of the writtenparameter.Check SigmaWin for the Σ-V-SD(MT) to see if the set software ver-sion agrees with that of the SERVO-PACK. If not, an alarm may occur.Write the parameter of anotherSERVOPACK of the same modelwith the same software version.Then turn the power OFF and thenON again.SERVOPACK failure − The SERVOPACK may be faulty.Replace the SERVOPACK.A.022:System ChecksumError(The parameter data inthe SERVOPACK isincorrect.)The power supply voltage sud-denly dropped. Measure the power supply voltage. The SERVOPACK may be faulty.Replace the SERVOPACK.The power supply went OFFwhile setting an utility function.Note the circumstances when thepower supply went OFF.The SERVOPACK may be faulty.Replace the SERVOPACK.SERVOPACK failureTurn the power supply ON and OFFseveral times. If the alarm stilloccurs, the SERVOPACK is faulty.The SERVOPACK may be faulty.Replace the SERVOPACK.
