
3. αiS/αiF/βiS SERIES PARAMETER ADJUSTMENT B-65270EN/05
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[Parameter window main screen] [Position control]
(8) Adjustment by using an arc (adjustment of the feed-forward coefficient
and adjustment of the servo function)
(a) Feed-forward function
For higher precision (higher performance) with small servo follow-up
delay, the feed-forward function is used. When the feed-forward
coefficient is set to 100%, the positional deviation can be almost
eliminated.
(Feed-forward)
By adding to a velocity command value the velocity
compensation value equivalent to the position command issued
from the CNC, the contour error due to position loop response
delay can be reduced.
(Velocity feed-forward)
The torque compensation amount equivalent to the amount of
change in velocity command (acceleration) is added to a
specified torque value so that the contour error due to velocity
loop response delay can be reduced.
-
+
Velocity control
Position feedback
Velocity
feed-forward
+
++
+
Feed-forward
Position control
Current
command
Velocity
command
Position
command
Velocity compensation
amount
Torque
compensation