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Servo Adjustment
6.2.5 Using Mode Switch
6 -10
6.2.5 Using Mode Switch
Use the mode switch function for the following purposes.
D
To suppress overshooting during acceleration or deceleration (for speed control).
D
To suppress undershooting during positioning and to shorten the setting time (for position
control).
Actual motor operation
Overshooting
Speed
Reference
Setting time
Time
Undershooting
The mode switch function makes it possible to automatically switch over the Servopack’s inter-
nal speed control mode from PI to P control mode and vice versa when specified conditions are
satisfied.
1.
The mode switch is used to fully utilize performance of a servodrive to achieve very high-speed position-
ing. The speed response waveform must be observed to adjust the mode switch.
2.
For normal use, the speed loop gain and position loop gain set by autotuning provide sufficient speed/posi-
tion control. Even if overshooting or undershooting occur, they can be suppressed by setting the accelera-
tion/deceleration time constant for the host device, the soft start time constants (Pn305, Pn306), or position
reference acceleration/deceleration constant (Pn204) for the Servopack.
J
J
Selecting Mode Switch Setting
The Servopack incorporates four mode switch settings (0 to 3). Select a mode switch with the
following user constant (Pn10B.0).
z
From PI control to P control
PI control means proportional/integral control and P control means proportional control. In short, switching “from
PI control to P control” reduces effective servo gain, making the servo system more stable.
TERMS
6
IMPORTANT
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