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6.2 High-speed Positioning
6 -13
Error Pulse Used as Detection Point
This setting is enabled for position control operation only.
If an error pulse exceeds the value set in user constant Pn10F, the speed loop switches to P con-
trol.
Motor speed
Reference
Speed
Pn10F
Deviation
Pulse
Time
P control
PI control
PI control
Operating Example
In this example, the mode switch is used to reduce setting time. Generally, speed loop gain
must be increased to reduce setting time. Using the mode switch suppresses the occurrence
of overshoot and undershoot when speed loop gain is increased.
Motor speed
Speed reference
Without mode switch
Long setting time
Increase speed loop gain.
Overshooting
Without mode switch
With mode switch function
Setting time
Motor
speed
Motor
speed
Motor
speed
Under-
shooting
Time
Suppress overshooting
and undershooting.
6.2.6 Speed Feedback Compensation
Use this function for shortening the setting time of the system in positioning operation.
Error counter
output
Position loop gain
(Pn102)
Integral control
(Pn101)
Speed loop gain
(Pn100)
Torque reference
filter (Pn401)
Torque reference
Speed feedback
Speed feedback com-
pensation (Pn111)
Speed feedback com-
pensation function
selection (Pn110.1)
+
--
+
+
6
A
EXAMPLE
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