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CIRCUIT OPERATION (cont’d)
Simulator Follower Control (SFC, optional control used with a speed sensor)
When the machine has torsional resonance, the (SFC) function may be used to try to reduce the
torsional vibration and increase the speed response.
With SFC, the speed regulator output signal is input to an inertia compensation block. This block
produces an estimated speed signal. The speed feedback is then subtracted from this value to create a
speed deviation signal. This signal is then sent through a proportional block and added to the output of the
speed regulator. The speed deviation signal is also sent through an anti-overshoot block and subtracted
from the speed regulator output. The combination of these two functions can be used to help improve the
recovery of the system during shock loading.
The speed deviation signal is also sent to a differential block and added to the torque reference (see
below). This signal is effective for torsional vibration control. When the SFC function is not used, set all of
the gains to 0.
Torque Reference and Current Reference
Signal SFC_T_R, the result of speed control, which is equivalent to the torque reference is input
and subjected to torque limit operation and di/dt processing. The differential output of the SFC control is
then added (if used). This is the torque reference that is sent to the current regulator.
Torque Reference
SFC_DATA
Limit block LMT_DIDT
T_R
<di/dt>
Torque reference
speed control
output
SFC T R
+
<Limit>
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