Table of Contents
Advertisement
4.4.8
Notch filter (Pr. 862, Pr. 863)
You can reduce the response level of speed control in the resonance frequency band of the mechanical system
to avoid mechanical resonance.
Parameter
Name
Number
862
Notch filter time constant
863
Notch filter depth
(1) Pr. 862 Notch filter time constant
If you do not know the mechanical resonance frequency, decrease notch frequency gradually from the highest value.
The point at which the smallest vibration is generated is the notch frequency setting.
Machine characteristic can be obtained beforehand with machine analyzer by FR Configurator. Necessary notch
frequency can be determined from this.
Setting
0
Frequency
Invalid
1000
Setting
10
11
Frequency
100
90.9
Setting
20
21
Frequency
50
47.6
Setting
30
31
Frequency
33.3
32.3
Setting
40
41
Frequency
25.0
24.4
Setting
50
51
Frequency
20.0
19.6
Setting
60
Frequency
16.7
(2) Pr. 863 Notch filter depth
The notch filter with deeper depth has an effect on minimizing mechanical resonance. However, large vibration may
be generated adversely due to substantial phase delay. Make adjustment of notch depth in order of the shallower
depth.
Setting
3
2
Depth
Shallow
Gain
-4dB
-8dB
Sensorless
Sensorless
Sensorless
Initial Value
0
0
1
2
3
500
333.3
12
13
83.3
76.9
22
23
45.5
43.5
32
33
31.3
30.3
42
43
23.8
23.3
52
53
19.2
18.9
1
0
Deep
-14dB
-40dB
Speed control by Real sensorless
vector control, vector control
Vector
Vector
Vector
Setting Range
0 to 60
Refer to the following table
0 (deep) 3 (shallow)
0 to 3
4
5
6
250
200
166.7
14
15
16
71.4
66.7
62.5
24
25
26
41.7
40
38.5
34
35
36
29.4
28.6
27.8
44
45
46
22.7
22.2
21.7
54
55
56
18.5
18.2
17.9
Description
7
8
9
142.9
125
111.1
17
18
19
58.8
55.6
52.6
27
28
29
37
35.7
34.5
37
38
39
27.0
26.3
25.6
47
48
49
21.3
20.8
20.4
57
58
59
17.5
17.2
16.9
4
117
Advertisement
Table of Contents
