4.3 Basic Functions Settings4-174 Operation4.3.6 Instantaneous Power Interruption SettingsDetermines whether to continue operation or turn OFF the servomotor’s power when the power supply voltageto the SERVOPACK's main circuit is interrupted.If the instantaneous power interruption time is equal to or lower than the set value in Pn509, the servomotorwill continue to be powered. If the instantaneous power interruption time exceeds the set value in Pn509, theservomotor is not powered. The servomotor is turned ON when power supply to the main circuit recovers.If the instantaneous power interruption time exceeds the set value in Pn509, the /S-RDY signal will be turnedOFF.If the uninterruptible power supplies are used for the control power supply and main circuit power supply, theSERVOPACK can withstand an instantaneous power interruption period in excess of 1000 ms.Pn509Instantaneous Power Cut Hold Time ClassificationSetting Range Setting Unit Factory Setting When Enabled20 to 1000 1 ms 20 Immediately Setup• The holding time of the control power supply for the 200-V SERVOPACKs is approxi-mately 100 ms. The holding time of the control power supply for the 100-V SERVO-PACKs is approximately 65 ms. If the control power supply makes control impossibleduring an instantaneous power interruption, the same operation will be performed asfor normally turning OFF the power supply, and the setting of Pn509 will be ignored.• The holding time of the main circuit power supply varies with the output of the SER-VOPACK. If the load on the servomotor is large and an undervoltage alarm (A.410)occurs, the setting of Pn509 will be ignored.• The holding time of the control power supply (24 VDC) for the 400-V SERVOPACKsdepends on the capability of the power supply (not included). Check the power supplybefore using the application.Speed Position TorqueInstantaneous power interruptionSet value for Pn509 ≥ OFF time (t)Instantaneous power interruptionOFF time (t)Power OFFSet value forPn509 ≥ OFF time (t)Set value forPn509 < OFF time (t)Main circuitpower supplySet value forPn509ServomotorstatusPower ONInstantaneous power interruptionSet value for Pn509 < OFF time (t)Instantaneous power interruptionForced OFFOFF time (t)Main circuitpower supplySet value forPn509ServomotorstatusPower ONOperationcontinues.