Notch Filter (Pr. 862, Pr. 863) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

Speed control by real sensorless
vector control, vector control
4.4.8

Notch filter (Pr. 862, Pr. 863)

Pr.860
You can reduce the response level of speed control in the resonance frequency band of the mechanical system
page181
to avoid mechanical resonance.
Pr.864
page238
Parameter
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 freqeuncy 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
Setting 10
Frequency
100
Setting 20
Frequency
50
Setting 30
Frequency 33.3
Setting 40
Frequency
25.0
Setting 50
Frequency
20.0
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.
Setting 3
Depth Sharrow
Gain
-4dB
116
Sensorless Sensorless Sensorless
Name Initial Value
1 2 3
1000 500 333.3
11 12 13
90.9 83.3 76.9
21 22 23
47.6 45.5 43.5
31 32 33
32.3 31.3 30.3
41 42 43
24.4 23.8 23.3
51 52 53
19.6 19.2 18.9
2 1 0
→ ←
Deep
-8dB -14dB -40dB
Vector Vector Vector
Setting Range
0 0 to 60
0 0 to 3
4 5
250 200 166.7
14 15
71.4 66.7
24 25
41.7 40
34 35
29.4 28.6
44 45
22.7 22.2
54 55
18.5 18.2
Description
Refer to the following table
0 (deep) → 3 (sharrow)
6 7 8
142.9 125
16 17 18
62.5 58.8 55.6
26 27 28
38.5 37 35.7
36 37 38
27.8 27.0 26.3
46 47 48
21.7 21.3 20.8
56 57 58
17.9 17.5 17.2
9
111.1
19
52.6
29
34.5
39
25.6
49
20.4
59
16.9