56Initial Start Up5.5.2 Induction MotorData5.5.3 Auto-TuningInduction MotorsFor best performance the motor model of the induction motor must bemeasured by the drive. Use the following steps to complete the measurementfor induction motors.Set up1) Make sure the rated motor power (LF.10), rated motor speed (LF.11),rated motor current (LF.12), rated motor frequency (LF.13), rated motorvoltage (LF.14) and rated power factor (LF.15) are entered into the drivebefore you begin. If the power factor is not on the name plate use 0.0as the value.2) Remove one brake wire from the controller or reduce the brake pick voltagelevel, preventing it from picking.Enter the motor rated speed (rpm) in LF.11. For IM this value is notthe synchronous speed but the full load rpm which is always less thansynchronous speed. An example is a 6 pole motor; the synchronous speedis 1200 rpm but the rated speed is lower, about 1165 rpm. If the rated speedis not listed on the nameplate then the value can be approximated as thesynchronous speed less 2.%, so 1200 rpm - 35 rpm = 1165 rpm.Enter the rated FLA of the motor in parameter LF.12.Enter the rated nameplate frequency in parameter LF.13. In some casesmanufacturers of induction motors de-rate the motor by changing thefrequency to something less than 60hz, i.e. 40Hz. In this case enterthe nameplate value of 40Hz. Most gearless motors will have a very lowfrequency in the range of 8 to 30 Hz. Enter the frequency as indicated onthe motor nameplate.In LF.14 enter the rated motor voltage. For IM this is the AC voltage at therated frequency, i.e. 230V or 480V.The IM power factor can be entered in LF.15. If this value is not known use thedefault value of 0.0. This parameter sets the pre control for the magnetizingcurrent level. Higher values result in lower magnetizing current. For olderexisting high slip or two speed motors use a value of 0.5.The field weakening speed in LF.16 is calculated by the drive. It may benecessary to adjust it later once the elevator is in operation and running athigh speed. For now leave it at the calculated value.LF.17 is the motor rated torque. With IM this value is calculated and is onlyfor reference.Entry of the IM motor data is now complete!
