8.13 Manual Tuning
8.13.1 Tuning the Servo Gains
8-82
Related Parameters
Next we will describe the following parameters that are used for model following control.
•
Pn140 (Model Following Control-Related Selections)
•
Pn141 (Model Following Control Gain)
•
Pn143 (Model Following Control Bias in the Forward Direction)
•
Pn144 (Model Following Control Bias in the Reverse Direction)
•
Pn147 (Model Following Control Speed Feedforward Compensation)
Model Following Control-Related Selections
Set Pn140 = n.
X to specify whether to use model following control.
If you use model following control with vibration suppression, set Pn140 to n.
1
or Pn140
= n.
2
. When you also perform vibration suppression, adjust vibration suppression with
custom tuning in advance.
Note: If you use vibration suppression (Pn140 = n.
1
or Pn140 = n.
2
), always set Pn140 to n.
1
(Use model following control).
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).
Parameter
Function
When Enabled
Classification
Pn140
n.
0
(default setting)
Do not use model following control.
Immediately
Tuning
n.
1
Use model following control.
n.
0
(default setting)
Do not perform vibration suppression.
n.
1
Perform vibration suppression for a specific
frequency.
n.
2
Perform vibration suppression for two specific
frequencies.
Pn141
Model Following Control Gain
Setting Range
Setting Unit
Default Setting
When Enabled
Classification
10 to 20,000
0.1/s
500
Immediately
Tuning
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 setting 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 opera-
tion. 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.
Information
2.0
141/10 [1/s]
520 ≥
Pn
Pn
Maximum feed speed [reference units/s]
Pn520
Position Deviation Overflow Alarm Level
Setting Range
Setting Unit
Default Setting When Enabled Classification
1 to
1,073,741,823
1 reference
unit
5,242,880
Immediately
Setup