8.1 Torque Filters
8-3
8
(2) Notch Filter
The notch filter can eliminate specific frequency vibration generated by sources such as resonances of ball screw
axes. The notch filter puts a notch in the gain curve at the specific frequency vibration. The frequency compo-
nents near the notch frequency can be eliminated with this characteristic. A higher notch filter Q value produces
a sharper notch and phase delay.
Set the machine’s vibration frequency in the parameter of a notch filter that is being used.
Q value = 0.5
Q value = 1.0
Notch filter
Notch filter
Gain
(db)
Frequency (Hz)
-300
-200
-100
0
100
2
10
10
3
10
4
2
10
10
3
10
4
Phase
Frequency (Hz)
-400
-300
-200
-100
0
(deg)
-300
-200
-100
0
100
2
10
10
3
10
4
2
10
10
3
10
4
-400
-300
-200
-100
0
Notch filter
Gain
(db)
Frequency (Hz)
Notch filter
Phase
(deg)
Frequency (Hz)
Parameter
Meaning
Pn408
n.
0
First stage notch filter disabled.
n.
1
First stage notch filter is used.
n.
0
Second stage notch filter disabled.
n.
1
Second stage notch filter is used.
Used notch filters are enabled. (It isn’t necessary to turn the power OFF and ON again.)
Pn409
First Stage Notch Filter Frequency
Setting Range
Setting Unit
Factory Setting
Setting Validation
50 to 2,000 Hz
1 Hz
2,000 Hz
Immediately
Pn40C
Second Stage Notch Filter Frequency
Setting Range
Setting Unit
Factory Setting
Setting Validation
50 to 2,000 Hz
1 Hz
2,000 Hz
Immediately
SIEPS80000025.book 3 ページ ２００４年１０月２５日 月曜日 午前１１時５７分
