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Chapter 10 Adjustment
10–12
(2) Adaptive filter (option function)
The servo driver detects the machine resonance point and automatically sets the filter constant.
Even if the ball screw and table position relation changes causing the resonance point to change,
the filter will track these changes.
Set the special servo function selection 1 (SV027: SSF1) bit 15 to activate the adaptive filter.
If the adaptive filter's sensitivity is low and the machine resonance cannot be suppressed, set the
(SV027: SSF1) bit 12 and 13.
No. Abbrev. Parameter name Explanation
SV027 SSF1 Activate the adaptive filter by setting the following parameters.
Special servo function
selection 1
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
aflt zrn2 afrg
afs
e
ovs2 ovs1 lmc2
lmc
1
om
r
vfct2 vfct1 upc
vcnt2 vcnt1
bit Meaning when "0" is set. Meaning when "1" is set.
15 aflt Adaptive filter stopped Adaptive filter activated
13 afrg
12 afse
00 : Normal adaptive filter
sensitivity
11 : Increased adaptive filter
sensitivity
POINT
The adaptive filter is an optional function. If the option is not set in the CNC,
alarm 37 (at power ON) or warning E4 Error Parameter No. 105 (2305 for
M50/M64 Series CNC) will be output.
10-3-3 Improving the cutting surface precision
If the cutting surface precision or roundness is
poor, improvements can be made by increasing
the speed loop gain (VGN1, VIA) or by using the
disturbance observer function.
<Examples of faults>
• The surface precision in the 45° direction of a
taper or arc is poor.
• The load fluctuation during cutting is large,
causing vibration or surface precision defects
to occur.
POINT
Adjust by raising the speed loop gain equivalently to improve cutting surface
precision, even if the measures differ. In this case, it is important how much the
machine resonance can be controlled, so adjust making sufficient use of
vibration suppression functions.
(1) Adjusting the speed loop gain (VGN1)
If the speed loop gain is increased, the cutting surface precision will be improved but the machine
will resonate easily.
The final VGN1 setting should be approx. 70 to 80% of the maximum value where resonance
does not occur.
(Refer to "10-2-2 (1) Setting the speed loop gain")
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