CHAPTER 4 PARAMETER
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Control Gain and Filter Setting Parameter
4
Specify to suppress resonance of the mechanical system. Up to two resonance points can be
suppressed. Select 1 (enable) for automatic notch filter selection to adjust the notch filter automatically
to the best value and suppress resonance.
Parameters automatically adjusted in this case include PA1_71 to _76. Values are stored in the
EEPROM every 10 minutes.
How to set the notch filter
(1) If there is resonance in the mechanical system, a notch filter is automatically set. If resonance is
not suppressed, set PA1_70 (automatic notch filter selection) at 0 (disable) and follow the
procedure below to manually adjust the notch filter.
(2) Using the servo analyze function of PC Loader, determine the resonance point of the machine.
(3) Enter the resonance frequency of and attenuation of the resonance point of the machine into
parameters.
(a) Resonance frequency PA1_71: Notch filter 1, frequency
(b) Depth PA1_72: Notch filter 1, attenuation *
(c) Width PA1_73: Notch filter 1, width
* Too much attenuation may undermine stability of the control. Do not enter too much
setting. (Set at 0 dB to disable the notch filter.)
(4) Approximate reference value
Refer to the table below for the approximate reference value.
Frequency [Hz] 200 500 700 1000
Attenuation [dB] -5 -10 -15 -20
Width 2,3
The notch filter is
added to the
resonance point.
Resonance
point
Gain
[dB]
(b) Depth
(c) Width
Frequency [Hz]
(a) Resonance frequency
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