4-52
Pn109 Feed-forward amount (Position)
Setting
range
0 to 100 Unit % Default
setting
0 Restart
power?
No
• Sets the feed-forward compensation value during positioning.
• When performing feed-forward compensation, the effective servo gain rises, improving responsive-
ness. There is almost no effect, however, on systems where the position loop gain is sufficiently high.
• Use to shorten positioning time.
Note Setting a high value may result in machine vibration. Set the feed-forward amount for general
machinery to 80% maximum. (Check and adjust machine response.)
Pn10A Feed-forward command filter (Position)
Setting
range
0 to 6400 Unit x 0.01 ms Default
setting
0 Restart
power?
No
• Sets the feed-forward primary (lag) command filter during position control.
• If the positioning completed signal is interrupted (i.e., repeatedly turns ON and OFF) because of per-
forming feed-forward compensation, and a speed overshoot is generated, alleviate the problem by
setting the primary lag filter.
D Speed Control Setting (Pn10b: Default Setting 0004)
Pn10b.0 Speed control setting –– P control switching conditions (Position, speed, internally-set speed
control)
Setting
range
0 to 4 Unit --- Default
setting
4 Restart
power?
Yes
Setting Explanation
Setting Explanation
0 Internal torque command (Pn10C) condition (Position, speed, internally-set speed control)
1 Speed command (Pn10d) condition (Position, speed, internally-set speed control)
2 Acceleration command (Pn10E) condition (Position, speed, internally-set speed control)
3 Deviation pulse (Pn10F) condition (Position)
4 P control switching function not used. (Position, speed, internally-set speed control)
• Sets the speed control loop switching function from PI control to P control.
• Normally, using the speed loop gain and the position loop gain set by means of the auto-tuning opera-
tion will provide adequate control. (Consequently, there is normally no need to change the setting.)
• When PI control is always being used, switching to P control may help if the Servomotor speed over-
shoots or undershoots (i.e., the effective servo gain is reduced by switching to P control to stabilize the
servo system). The positioning time can also be shortened in this way.
• If the output torque is saturated during acceleration and deceleration, set speed control to 0 (switching
by internal torque command), or 2 (switching by acceleration command).
• If the speed control overshoots or undershoots without the output torque being saturated during accel-
eration and deceleration, set speed control to 1 (switching by speed command), or 3 (switching by
deviation pulse value).
• If the setting is made from 0 to 3 (i.e., if P control switching is used), set the switching condition to
Pn10C to Pn10F.
Operation Chapter 4
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