Optimise Response To Setpoint Changes And Determine Mass Inertia - Lenze 8400 StateLine C Reference Manual

5.8.4.3

Optimise response to setpoint changes and determine mass inertia

Setting the total moment of inertia under
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.
Without feedforward control:
n, M
C00273 set too high:
n, M

Actual speed value (signal nMotorSpeedAct)
Speed setpoint (signal nMotorSpeedSet)
Speed controller output (signal nOutputSpeedCtrl)
[5-15] Typical signal characteristics for different settings of the load moment of inertia
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Œ

Ž
Œ
Ž
L
8400 StateLine C | Reference manual
Sensorless control for synchronous motors (SLPSM)
C00273 provides the optimum torque
C00273 set too low:
Œ
n, M

Ž
t
Optimum feedforward control:
n, M
Œ

Ž
t
Motor control (MCTRL)
t
t
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