9 Troubleshooting9.2.2 Troubleshooting of Warnings9-24A.971:UndervoltageThe AC power supplyvoltage dropped to 280V or less for a 400-VACSERVOPACK.Measure the power supply voltage. Set the power supply voltage withinthe specified range.The power supply volt-age dropped duringoperation.Measure the power supply voltage. Increase the power supply capacity.Occurrence of instanta-neous power interrup-tion.Measure the power supply voltage.When the instantaneous power cuthold time (Pn509) is set, decrease thesetting.A fault occurred in theSERVOPACK or con-verter.−The SERVOPACK or converter maybe faulty. Replace the SERVOPACKor converter.A.9A0:Overtravel(Overtravel statusis detected.)When the servomotorpower is ON, over-travel status is detected.Check the input signal monitor(Un005) to check the status of theovertravel signals.Refer to 9.3 Troubleshooting Malfunc-tion Based on Operation and Condi-tions of the Servomotor. Even ifovertravel signals were not shown bythe input signal monitor (Un005),momentary overtravel may have beendetected. Take the following precau-tions.• Do not specify movements thatwould cause overtravel from thehost controller.• Check the wiring of the overtravelsignals.• Take countermeasures for noise.(cont’d)Warning Num-ber: WarningName (WarningDescription)Cause Investigative Actions Corrective Actions
