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YASKAWA SGMJV - Page 265

YASKAWA SGMJV
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6.9 Compatible Adjustment Function
6-71
6
Adjustments
Using the Acceleration Level to Switch Modes
With this setting, the speed loop is switched to P control when the speed reference exceeds the acceleration
rate set in Pn10E.
<Example>
If the mode switch function is not being used and the SERVOPACK is always operated with PI control, the
speed of the motor may overshoot or undershoot due to torque saturation during acceleration or deceleration.
The mode switch function suppresses torque saturation and eliminates the overshooting or undershooting of
the motor rotational speed.
Motor rotational speed
Reference speed
Speed
Motor acceleration
+Pn10E
Acceleration
-Pn10E
PI Control PI Control
0
PI
P
P
Time
Without Mode Switching With Mode Switching
Overshoot
Undershoot
Motor
rotational
speed
Time
Motor
rotational
speed
Time

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