
B–63503EN–1/01
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
274
CAUTION
1 The angle of the machining tool path is compared with that
specified in parameter No. 1740 only for the selected plane.
The actual feedrate and that specified in parameter No.
1741 are compared only for the first and second axes of the
selected plane. Even if simultaneous movement is
performed along three or more axes, the feedrates of only
the first and second axes are compared for the selected
plane.
2 The roundness of a corner is determined by the angle and
feedrate specified in parameter Nos. 1740 and 1741,
respectively. If a sharp corner is always required, set a
feedrate of zero and an angle of 180000 (180 degrees).
3 If a G09 (exact stop) command is executed, an exact stop
is performed, irrespective of the angle and feedrate
specified in parameter Nos.1740 and 1741.
4 This function is disabled in single block and dry run mode.
If the difference between the programmed feedrates at the end of block A
and at the beginning of block B for each axis exceeds the value specified
in parameter No. 1781, and if the feedrates for all axes are lower than that
specified in parameter No. 1741, the system executes block B, assuming
that no pulses are accumulated.
The figure shows the relationship between the feedrate and time when the
feedrate difference for each axis exceeds the value specified in parameter
No. 1781.
At time t, some accumulated pulses remain, as indicated by the shaded
section. The system, however, starts the next block because the feedrate
of the automatic acceleration/deceleration circuit is lower than that
specified in parameter No. 1741.
Speed set by parameter
(No. 1741)
t
Time
Speed
Block A Block B
Caution
Feedrate control
according to the feedrate
difference for each axis
D Overview