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4 Servo Adjustment
MITSUBISHI CNC
<Notch filter>
This servo drive unit mounts 5 notch filters. Measure the resonance frequency with AFLT frequency
display on NC drive monitor screen and the current feedback analog output function, and set that
frequency in parameter.
However, if the notch filter is set to a particularly low frequency, another resonance frequency that did
not vibrate initially may occur. If the notch filter's depth compensation (SV033, nfd1, nfd2) is adjusted so
that the filter does not operate unless necessary, the servo control will be stabilized.
Notch filter 3 is a filter with frequency fixed to 1125Hz, and has no depth compensation.
<Setting method>
[1] Set the resonance frequency in the notch filter frequency (1, 2, 4, 5).
[2] If the machine starts to vibrate at another frequency, raise (make shallower) the notch filter
depth compensation value, and adjust to the optimum value at which the resonance can be
eliminated.
[3] When the vibration cannot be completely eliminated, use also another notch filter for this
frequency.
【#2233】 SV033 SSF2 Servo function 2
bit 7-5 : nfd2 Depth of Notch filter 2
Set the depth of Notch filter 2 (SV046).
bit7,6,5=
000: - ∞
001: -18.1[dB]
010: -12.0[dB]
011: -8.5[dB]
100: -6.0[dB]
101: -4.1[dB]
110: -2.5[dB]
111: -1.2[dB]
Set the adaptive frequency of Notch filter 2 in "#2246 SV046 FHz2".
bit 4 : nfd3 Notch filter 3
0: Stop 1: Start (1,125Hz)
bit 3-1 : nfd1 Depth of Notch filter 1
Set the depth of Notch filter 1 (SV038).
bit3,2,1=
000: - ∞
001: -18.1[dB]
010: -12.0[dB]
011: -8.5[dB]
100: -6.0[dB]
101: -4.1[dB]
110: -2.5[dB]
111: -1.2[dB]
Set the adaptive frequency of Notch filter 1 in "#2238 SV038 FHz1".
【#2238】 SV038 FHz1 Notch filter frequency 1
Set the vibration frequency to suppress when machine vibration occurs.
(Normally, do not set 80 or less.)
Set to "0" when not using.
---Setting range---
0 to 2250 (Hz)