
B–63833EN–1/02
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
337
@ When linear acceleration/deceleration before interpolation for
cutting feed is enabled
If the difference between the feedrates of blocks A and B for each axis
exceeds the value specified in parameter No. 1780, the feedrate at the
corner is calculated from the difference for each axis, as shown below.
The feedrate is reduced to the calculated value in block A.
The feedrate change for each axis (Vc[X], Vc[Y], ...), caused by the
movement at programmed feedrate F, is compared with Vmax specified
in parameter No. 1780. If an feedrate change exceeding Vmax is
detected, the target feedrate after deceleration Fc is calculated, using
maximum comparison value Rmax.
R =
Vc
Vmax
Fc =
F
Rmax
If, for example, the direction of movement is changed from the X–axis to
the Y–axis, that is through 90 degrees, and if the programmed feedrate is
1000 mm/min and the permissible feedrate difference specified in
parameter No. 1780 is 500 mm/min, the deceleration shown below is
performed: