Notch Filter (Pr. 862, Pr. 863) - Mitsubishi Electric FR-A760 Series Instruction Manual

Speed control by real sensorless
vector control, vector control
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.
⋅
Setting 0
Frequency Invalid 1000
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. Make adjustment of notch depth in order of the shallower
depth.
Setting 3 2
Depth →
Shallow
Gain
-4dB -8dB
104
Sensorless Sensorless Sensorless
Initial Value
0
0
1 2 3
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
1 0
←
Deep
-14dB -40dB
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