
B-65270EN/05 APPENDIX E.VELOCITY LIMIT VALUES IN SERVO SOFTWARE
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(*1) If conventional feed-forward is used, the permissible
feedrate is decreased. To avoid this from occurrence, the
following techniques are thought to be necessary:
- Avoid using feed-forward when not using a high
precision function.
- Use feed-forward together with fine acc./dec..
(*2) For AI nano contour control, AI high precision contour
control, and AI nano high precision contour control, the
limit is 98 m/min on the NC and 196 m/min on the servo
software. If CMR is increased to further decrease the
detection unit, the feedrate limit on the NC is invariable, but
the feedrate limit on the servo software decreases in
proportion to the detection unit. If the detection unit is
decreased, therefore, the feedrate limit will be the smaller
one.
Detection unit Limit on the NC Limit on the servo
software
0.1µm 98m/min 196m/min
0.05µm 98m/min 98m/min
0.02µm 98m/min 39m/min
0.01µm 98m/min 19.6m/min
* If a semi-closed system (rotary or linear motor) where a detector
with a high resolution is used, using also nano interpolation
enables these functions to be used for position control at the
highest limit to the detector resolution even if the detection unit
is not subdivided.
* If you are using these functions with a larger detection unit
because of feedrate limits placed by the detection units stated
above, velocity feedback data that can seriously affect velocity
loop control is used for control at the highest limit to the detector
resolution.