Filter
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181
Additional functions (Pr. 851 to Pr. 865)
PARAMETERS
3
3.34.3 Excitation ratio (Pr. 854 )
3.34.4 Notch filter (Pr. 862, Pr. 863 )
zPr. 862 "notch filter frequency"
zPr. 863 "notch filter depth"
z Decrease the excitation ratio when you want
to improve efficiency under light load. (motor
magnetic noise decreases) Note that the rise
of output torque becomes slow if excitation
ratio is decreased. This function is
appropriate for applications as machine tools
which repeat rapid acceleration/deceleration
up to high speed.
Parameter Name Factory Setting Setting Range Remarks
854 Excitation ratio 100% 0 to 100% Extended mode
REMARKS
When "1" (magnetic flux command from the terminal 1) is set in Pr. 868 "terminal 1 function assignment", this Pr. 854 setting is
made invalid.
Pr. 859 Refer to page 123
You can reduce the response level of speed control in the resonance frequency band of the mechanical
system to avoid mechanical resonance.
Parameter Name Setting Range Increments Factory Setting Remarks
862 Notch filter frequency 0 to 31 1 0
0: Function
invalid
Extended mode
863 Notch filter depth 0 to 3 1 0
Pr. 862
Setting
Frequency
Pr. 862
Setting
Frequency
Pr. 862
Setting
Frequency
Pr. 862
Setting
Frequency
0 invalid 8 140.6 16 70.3 24 46.9
1 1125.0 9 125.0 17 66.2 25 45.0
2 562.5 10 112.5 18 62.5 26 43.3
3 375.0 11 102.3 19 59.2 27 41.7
4 281.3 12 93.8 20 56.3 28 40.2
5 225.0 13 86.5 21 53.6 29 38.8
6 187.5 14 80.4 22 51.1 30 37.5
7 160.7 15 75.0 23 48.9 31 36.3
Pr. 863 Setting Depth (Gain)
0 deep (-40dB)
1
(-14dB)
2
(-8dB)
3 sharow (-4dB)
CAUTION
z 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.
z 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.
z Machine characteristic can be obtained beforehand with machine analyzer by setup software. Necessary
notch frequency can be determined from this.
speed torque position
Excitation
ratio
[%]
100
(Factory setting)
Pr. 854
setting
0 100 Load[%]
speed position