
8.13 Manual Tuning
8.13.2 Compatible Adjustment Functions
8-86
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.
Model Following Control Type Selection
When you enable model following control, you can select the model following control type. Nor-
mally, set Pn14F to n.
1 (Use model following control type 2) (default setting). If compati-
bility with previous models is required, set Pn14F to n.
0 (Use model following control type
1).
8.13.2
Compatible Adjustment Functions
The compatible adjustment functions are used together with manual tuning. You can use these
functions to improve adjustment results. These functions allow you to use the same functions
as for
Σ
-III-Series SERVOPACKs to adjust
Σ
-7-Series SERVOPACKs.
Feedforward
The feedforward function applies feedforward compensation to position control to shorten the
positioning time.
Note: If you set the feedforward value too high, the machine may vibrate. As a guideline, use a setting of 80% or
less.
Pn143
Model Following Control Bias in the Forward Direction
Setting Range
Setting Unit
Default Setting
When Enabled
Classification
0 to 10,000
0.1%
1,000
Immediately
Tuning
Pn144
Model Following Control Bias in the Reverse Direction
Setting Range
Setting Unit
Default Setting
When Enabled
Classification
0 to 10,000
0.1%
1,000
Immediately
Tuning
Pn147
Model Following Control Speed Feedforward Compensation
Setting Range
Setting Unit
Default Setting
When Enabled
Classification
0 to 10,000
0.1%
1,000
Immediately
Tuning
Parameter
Meaning
When Enabled
Classification
Pn14F
n.
0
Use model following control type 1.
After restart
Tuning
n.
1
(default setting)
Use model following control type 2.
Position
Position
Position
Pn109
Feedforward
Setting Range
Setting Unit
Default Setting
When Enabled
Classification
0 to 100
1%
0
Immediately
Tuning
Pn10A
Feedforward Filter Time Constant
Setting Range
Setting Unit
Default Setting
When Enabled
Classification
0 to 6,400
0.01 ms
0
Immediately
Tuning
+
+
+
Pn109
Pn10A
Po
s
ition reference pul
s
e
s
Feedback pul
s
e
s
Po
s
ition loop gain (Kp)
Feedforward Filter
Time Con
s
tant
Feedforward
Differential
Position
Position