
B–63523EN–1/03
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
921
If the override is enabled for the function of decelerating according to the
cutting load, the feedrate may be lower than the lowest feedrate.
When AI high–precision contour control is not used, the lowest feedrate
for deceleration according to the acceleration in circular interpolation is
specified in parameter No. 19512.
NOTE
In involute interpolation, the lowest feedrate set for
”acceleration clamping near the basic circle” in automatic
feedrate control in involute interpolation is used.
NOTE
1 If the allowable acceleration setting for an axis is more than
double the setting for another axis, the feedrate may be
temporarily decreased at a corner at which the move
direction sharply changes.
2 If the machine lock signal is turned on during movement in
mode in which look–ahead acceleration/deceleration
before interpolation is used, the machine enters the
machine lock status after termination of deceleration.
3 If a non–movement block or one–shot G code command
such as G09 is found in mode in which look–ahead
acceleration/deceleration before interpolation is used, the
movement is decelerated and temporarily stopped in the
preceding block.
4 When the dry run signal is inverted from ”0” to ”1” or from ”1”
to ”0” during movement along an axis, acceleration/
deceleration is performed to the specified feedrate without
deceleration to feedrate 0. The function of decelerating
according to the feedrate difference at each corner is also
valid during dry run.
Note