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

8 Operation8.3.6 Instantaneous Power Loss Settings8.3.6 Instantaneous Power Loss SettingsDetermines whether to continue operation or turn the servo OFF when the power supply voltage to the SERVO-PACK main circuit is instantaneously interrupted.Pn509 Instantaneous Power Cut Hold TimeSpeed Position TorqueSetting Range Setting Unit Factory Setting Setting Validation20 to 1000 ms 20 ImmediatelyIn power loss detection, the status of the main circuit power supply is detected and OFF status is ignored so servomotoroperation will continue if the servomotor turns back ON within the time set in parameter Pn509.In the following instances, however, the parameter settingwill be invalid.• If an insufficient voltage alarm (A.41) occurs during apower loss with a large servomotor load.• When control is lost (equivalent to normal power OFFoperation) with loss of the control power supply.PowersupplyvoltagePn509 > tServo ONInstantaneous power interruptionOFF time tOperationcontinued• IMPORTANTThe maximum setting for the hold time during a powerloss is 1,000 ms, but the hold time for the SERVOPACKcontrol power supply is about 100 ms. The hold time forthe main circuit power supply depends on the SERVO-PACK output.Pn509 < t Servo ON Servo OFFTo continue SERVOPACK operation for a power loss that is longer than this, provide an uninterruptible power supply.8-26