8400 StateLine C | Reference manual
Motor control (MCTRL)
Sensorless vector control (SLVC)
170 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
The following applies to the reset time Ti (C00074/2) <= 15 ms:
The reduction of the magnetising current in the field weakening range can be adapted via
the override point of field weakening (C00080
):
C00080
> 0 Hz: The reduction of the magnetising current is shifted to higher field
frequencies. Here, there is a risk of the motor being magnetised too much and having
too little voltage reserve for the torque-creating current.
C00080
< 0 Hz: The reduction of the magnetising current is shifted to lower field
frequencies.
5.7.4.5 Optimise response to setpoint changes and determine mass inertia
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.
[5-12] Typical signal characteristics for different settings of the load moment of inertia
Note!
A function for enabling a stable operation can only be implemented to a limited
extent with a reset time Ti <= 15 ms For applications with speeds above the 2-
fold rated speed, we recommend a reset time Ti (C00074/2
) > 15 ms.
Without feedforward control: C00273 set too low:
C00273
set too high: Optimum feedforward control:
n Actual speed value (nMotorSpeedAct_a signal)
o Speed setpoint (nSpeedSetValue_a signal)
p Speed controller output (nOutputSpeedCtrl_a signal)
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