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5 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]
bit 4 : fhz3 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]
【#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)
【#2246】 SV046 FHz2 Notch filter frequency 2
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)