Chapter 5 Adjustment
5-13
(4) Adaptive filter (option function)
The servo amplifier 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 servo function selection 1 (SV027: SSF1) bit F to activate the adaptive filter.
If the vibration suppression effects do not appear even when the adaptive filter is activated,
change the "MAX current" display on the servo monitor, and confirm the operation status of the
adaptive filter. When the adaptive filter operation gain is 70% or more, adjust by gradually raising
the filter operation sensitivity (SV033: SSF2.afs) from the point where the sufficient filter results do
not appear.
Once converged, the adaptive filter constant is stored in the servo amplifier memory when the
CNC power is turned OFF. Even if the amplifier is turned OFF, it will start with the previously
saved constant when the power is turned ON next. To reset a filter constant that has been
converged once, set 0 in SSF1.aflt and stop the adaptive filter.
No. Abbrev. Parameter name Explanation
SV027 SSF1 Activate the adaptive filter by setting the following parameters.
Servo function selection 1
F E D C B A 9 8 7 6 5 4 3 2 1 0
aflt zrn2 ovs lmc vfct
bit Meaning when "0" is set. Meaning when "1" is set.
F aflt Adaptive filter stopped Adaptive filter activated
SV033 SSF2 Set the adaptive filter sensitivity compensation with the following parameters.
Servo function selection 2
F E D C B A 9 8 7 6 5 4 3 2 1 0
afs fhz2 nfd
bit Descriptions
8~
B
afs
Standard sensitivity when 0 is set.
If the filter depth is not deep enough (generally 70% or more) and
the vibration cannot be sufficiently eliminated, adjust by raising the
setting value in increments of 1.
SV034 SSF3 Servo function selection 3 The display data for the maximum current value on the servo monitor is
determined with the following parameter.
F E D C B A 9 8 7 6 5 4 3 2 1 0
daf2 daf1 dac2 dac1
mon
bit
mon
MAX current 1 MAX current 2
0
Max. current command value
(%) when power is turned ON
Max. current command value (%)
for 1 second
1
Max. current command value
(%) for 1 second
Max. current FB value (%) for 1
second
2
Max. current FB value (%) when
power is turned ON
Max. current FB value (%) for 1
second
3
Load inertia rate (SV059 setting
value)
−
4
Adaptive filter operation
frequency (Hz)
Adaptive filter operation gain (%)
5 PN bus voltage (V)
Regenerative operation
frequency monitor (times/sec)
6
Maximum estimated torque for
one second (%)
Maximum current FB value for
one second (%)
7
Maximum estimated torque for
one second (%)
Maximum disturbance torque for
two seconds (%)
0~3
8~F Setting prohibited
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.
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