Lenze 8400 motec - Manual (Page 156)

5 Motor control (MCTRL)
5.10 Parameterisable additional functions
156 Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
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5.10.6 Mass inertia precontrol
Setting the total moment of inertia under C00273 provides the optimum torque feedforward
control. Depending on the application, an adjustment of the setting under C00273 may be
necessary to optimise the response to position/speed setpoint changes by means of the torque
feedforward control.
[5-13] Typical signal characteristics for different settings of the load moment of inertia
Without feedforward control: C00273 set too low:
C00273 set too high: Optimum feedforward control:
 Actual speed value (signal nMotorSpeedAct)
 Speed setpoint (signal nMotorSpeedSet)
 Speed controller output (signal nOutputSpeedCtrl)
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