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8.12 Manual Tuning
8.12.1 Tuning the Servo Gains
Pn140
Model Following Control Gain
The model following control gain determines the response characteristic of the servo system. If
you increase the setting of the model following control gain, the response characteristic will
improve and the positioning time will be shortened. The response characteristic of the servo
system is determined by this parameter, and not by Pn102 (Position Loop Gain).
Pn141
Information
Model Following Control Bias in the Forward Direction and Model Following Control Bias in
the Reverse Direction
If the response is different for forward and reverse operation, use the following parameters for
fine-tuning.
If you decrease the settings, the response characteristic will be lowered but overshooting will
be less likely to occur.
Pn143
Pn144
Model Following Control Speed Feedforward Compensation
If overshooting occurs even after you adjust the model following control gain, model following
control bias in the forward direction, and model following control bias in the reverse direction,
you may be able to improve performance by setting the following parameter.
If you decrease the settings, the response characteristic will be lowered but overshooting will
be less likely to occur.
8-76
Parameter
n.
0
Do not use model following control.
(default setting)
n.
1
Use model following control.
n.
0
Do not perform vibration suppression.
(default setting)
Perform vibration suppression for a specific
n.
1
frequency.
Perform vibration suppression for two specific
n.
2
frequencies.
Model Following Control Gain
Setting Range
Setting Unit
10 to 20,000
For machines for which a high model following control gain cannot be set, the size
of the position deviation in model following control will be determined by the set-
ting of the model following control gain. For a machine with low rigidity, in which a
high model following control gain cannot be set, position deviation overflow
alarms may occur during high-speed operation. If that is the case, you can
increase the setting of the following parameter to increase the level for alarm
detection.
Use the following conditional expression for reference in determining the setting.
Maximum feed speed [reference units/s]
Pn
520 ≥
Pn
Position Deviation Overflow Alarm Level
Setting Range
Pn520
1 to
1,073,741,823
Model Following Control Bias in the Forward Direction
Setting Range
Setting Unit
0 to 10,000
Model Following Control Bias in the Reverse Direction
Setting Range
Setting Unit
0 to 10,000
Function
Default Setting
0.1/s
500
2.0
141/10 [1/s]
Setting Unit
Default Setting When Enabled Classification
1 reference
unit
Default Setting
0.1%
1,000
Default Setting
0.1%
1,000
When Enabled
Immediately
Position
When Enabled
Immediately
Position
5,242,880
Immediately
Position
When Enabled
Immediately
Position
When Enabled
Immediately
Classification
Tuning
Classification
Tuning
Setup
Classification
Tuning
Classification
Tuning
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Table of Contents
Troubleshooting
