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4. Servo Adjustment
4 - 14
(4) Variable speed loop gain control
If vibration occurs when the motor is rotating at a high speed, such during rapid traverse, or if
disturbing noise occurs, the state can be improved by lowering the speed loop gain during
high-speed rotation. The low-speed region speed loop gain used for cutting feed (G1 feed), etc., is
maintained at a high level, so the vibration can be improved without dropping the machining
accuracy.
No. Abbrev. Parameter name Explanation Setting range
SV005 VGN1 Speed loop gain 1 Set the speed loop gain.
Set this according to the load inertia size.
The higher the setting value is, the more accurate the control will be,
however, vibration tends to occur.
If vibration occurs, adjust by lowering by 20 to 30%.
The value should be determined to be 70 to 80% of the value at the
time when the vibration stops.
1 to 999
VGN1
VGN2
VCS VLMT
SV006 VGN2 Speed loop gain 2 If the noise is bothersome at high
speed during rapid traverse, etc, lower
the speed loop gain.
As in the right figure, set the speed
loop gain of the speed 1.2 times as
fast as the motor’s rated speed, and
use this with SV029 (VCS).
When not using, set to "0".
0
(Rated speed × 1.2)
-1000 to 1000
SV029 VCS Speed at the change
of speed loop gain
If the noise is bothersome at high speed during rapid traverse, etc,
lower the speed loop gain.
Set the speed at which the speed loop gain changes, and use this with
SV006 (VGN2). (Refer to SV006.)
When not using, set to "0".
0 to 9999
(r/min)