
12. DISPLAY/SET/EDIT
B–64113EN–1/01
872
NOTE
1 This item is disabled for APC and AI APC.
2 The time constant mentioned above is common to all axes.
Changing this item results in the settings of all axes being
changed.
tb
ta
tc
tb tb tb
tc
ta
Velocity
Time
Linear acceleration/deceleration
Bell–shaped acceleration/deceleration
ta: Depending on linear–portion accel-
eration
tb: Bell–shaped acceleration/decelera-
tion time constant
tc: Bell–shaped acceleration/decelera-
tion time
tc = ta + tb
ta is not constant. It varies depend-
ing on the rapid traverse rate and
time constant of an axis to which the
command is issued.
This item is used to set up an allowable acceleration in acceleration–based
velocity setup (in mm/s
2
).
Setting range: 0 to 99999.999 (mm/s
2
or degrees/s
2
)
Size: 2–word type
For AI contour control and AI APC, the arc radius–based feedrate clamp
setting is also changed automatically.
The parameter value specified on the machining parameter tuning screen
is reflected on the following parameters:
(APC control/AI contour control/AI APC)
No. 13620: Velocity–first parameter
No. 13621: Precision–first parameter
In addition, the following parameter is set up according to the precision
level:
S APC (for rotation axes and millimeter machine linear axes)
Effective value =
(No.1730)
2
No.1731
10
36
(IS–B)
=
(No.1730)
2
No.1731
100
36
(IS–C)
Note: Parameter Nos. 1730 and 1731 are set/re–set automatically only
when MCR (bit 0 of parameter No. 13600) = 0.
D Allowable acceleration