
3. α SERIES PARAMETER ADJUSTMENT B-65150E/04
− 74 −
Table 3.4.3 (b) Codes for starting and ending each mode
Start End
FS16, 18, 21 + Advanced preview control G08P1 G08P0
FS16 + High-precision contour control
FS15B + High-precision contour control
FS15i + Fine HPCC
G05P10000 G05P0
FS16i + AI contour control
FS16i + AI nano-contour control
FS15B + Advanced preview control
FS21i + AI advanced preview control
G05.1Q1 G05.1Q0
In Fig. 3.4.3 (a), the feed-forward coefficient is insufficient, resulting
in a radius reduction of about 5 µm. In addition, the velocity loop gain
is low, so that swells and quadrant protrusions are observed. By
adjusting the feed-forward coefficient as shown in Fig. 3.4.3 (b), the
arc radius reduction can be reduced to nearly 0.
In the figures above, a low velocity loop gain is used for measurement.
By using an increased velocity loop gain, swells and quadrant
protrusions can be reduced (Fig. 3.4.3 (c)). Increase the velocity loop
gain to 70% to 80% of the limit. Adjust the feed-forward coefficient
finely, and apply quadrant protrusion compensation (backlash
acceleration/deceleration) to reduce the quadrant protrusions and
improve the roundness (Fig. 3.4.3 (d)).
Specified
arc
Swell
Quadrant
protrusion
Fig. 3.4.3 (a) Feed-forward adjustment
Velocity loop gain: 100%
Advanced preview feed-forward coefficient: 95%
FAD time constant: 24 ms (linear type)
Fig. 3.4.3 (b) Feed-forward adjustment
Velocity loop gain: 100%
Advanced preview feed-forward coefficient: 98%
FAD time constant: 24 ms (linear type)