User Manual High Performance AC Drive

Application Notes C-5Motor OverloadMtr I2T Spd MinSets the minimum speed for the motor overload (I 2 T) function. The valueindicates minimum speed below the minimum current threshold [Mtr I2TCurr Min], and these are the first current/speed breakpoint. From this pointthe current threshold is linear to the value specified by the motor servicefactor Par 336 [Motor OL Factor].Figure C.1 Motor Overload Curve With Par 338 [Mtr I2T Spd Min] Is Less Than 1.0P336 [Service Factor]CurrentWhen motor current exceeds the value of the curve, MtrOL Output integrates. A motor overload exception eventoccurs when the value in Mtr OL Output reaches 1.0.The value of Mtr OL Output is visible in Par 330 [FaultTP Data] when the value of Par 329 [Fault TP Sel]equals 13.P337 [Mtr I2T Curr Min]P338 [Mtr I2T Spd Min] Base Speed (1.0)SpeedFigure C.2 Motor Overload Curve With Par 338 [Mtr I2T Spd Min] Is Equal To 1.0P336 [Service Factor]CurrentWhen the value of Par 338 [Mtr I2T Spd Min] equals 1.0,the curve is flat - at the value of rated motor current timesthe value of Par 336 [Motor OL Factor]. If motor currentexceeds the value of the curve, the value of Mtr OL Outputintegrates. The value of Mtr OL Output is visible in Par 330[Fault TP Data] when the value of Par 329 [Fault TP Sel]equals 13.SpeedStop Dwell TimeSets an adjustable delay time between detecting zero speed and disablingthe speed and torque regulators, when responding to a stop command.Important: Consult industry and local codes when setting the value of thisparameter.Figure C.3 Drive Operation When Par 154 [Stop Dwell Time] Equals ZeroSpeedWhen Par 154 [Stop Dwell Time] equals zero, the drive turnsoff the velocity and torque regulators when it detects zerospeed.P 160 [Zero Speed Lim]0 TimeDrive Receives Stop CommandDrive Detects Zero Speedand Turns Off Regulators