
D.PARAMETERS RELATED TO HIGH-SPEED AND HIGH-PRECISION OPERATIONS APPENDIX B-65270EN/05
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(4) Parameters common to all CNC models (requiring tuning)
• Parameters requiring tuning for finding optimum values
Parameter No.
FS30i ,16i, etc.
FS15i
Setting at tuning start Description Items to be referenced in tuning
2021
1875
300
Load inertia ratio (velocity gain)
* When the cutting/rapid
velocity gain switching
function is used, this
parameter is applied to rapid
traverse.
While checking vibration at stop, abnormal
sound during low-speed movement,
vibration during high-speed rotation, and so
on, find the vibration limit, and set about
70% of the limit.
→ See 3.3.1(6)
2107
1700
150
Cutting load inertia ratio
override (in % units)
* When the cutting/rapid
velocity gain switching
function is used, the gain
magnified by this parameter
setting is applied to cutting.
While checking vibration at stop, abnormal
sound during low-speed movement,
vibration during high-speed rotation, and so
on, find the vibration limit, and set about
70% of the limit.
→ See 3.3.1(6) and 4.3.
1825
Standard: 3000
Speed priority I: 5000
Speed priority II: 10000
Position gain
After determining the velocity loop gain, find
the upper limit of the range in which hunting
(low frequency vibration) does not occur.
→ See 3.3.1(6).
2069
1962
Standard: 50
When nano interpolation
is used, see
(NOTE 2)
.
200
Velocity feed-forward coefficient
Make adjustment while observing the
shape of rounded corners.
→ See 3.3.1(11).
2047
1859
Standard parameter Observer parameter
Make adjustment while observing estimated
disturbance value on the check board.
→ See 4.12.1.
2087
1980
0 Torque offset
Make adjustment while measuring positive
and negative torque commands at a
constant low feedrate.
2048
1860
30
Stage-1 acceleration amount for
2-stage backlash acceleration
Make adjustment while observing the
quadrant protrusion size.
→ See 4.6.7.
2039
1724
100 2nd-stage acceleration amount
Make adjustment while observing the
quadrant protrusion size.
2082
1975
10
Stage-2 start distance
(detection unit)
Make adjustment while observing the
quadrant protrusion size.
2089
1982
50
Stage-2 end distance (set with a
ratio to the start distance
specified in 10% units)
Make adjustment while observing the
quadrant protrusion size.
2114
1725
10 Stage-2 override
Make adjustment while observing the
quadrant protrusion size.
NOTE
1 There is the following relationship between the load inertia ratio and velocity loop
gain (%).
Velocity loop gain (%) = (1 + load inertia ratio/256) × 100
2 The phrase "using nano interpolation" means using AI contour control I, AI contour
control II, Fine HPCC, look-ahead acc./dec. before interpolation, AI nano high
precision contour control, or AI nano contour control.