
PROGRAMMING
B–61404E/08
5. FEED FUNCTIONS
76
This function can apply smooth acceleration/deceleration to a rapid
traverse rate to reduce the mechanical stress and strain caused by
acceleration/deceleration variations when the feedrate changes. Thus, a
smaller time constant can be set, compared with linear
acceleration/deceleration, to reduce the time required for
acceleration/deceleration. Feed–forward control can be enabled for a
rapid traverse command.
This function is optional.
<Rapid traverse linear acceleration/deceleration>
Feedrate
0
Acceleration
0
Time
Time
Feedrate
0
Acceleration
0
Time
Time
<Rapid traverse bell–shaped acceleration/deceleration>
Fig. 5.10 (a)
Rapid traverse bell–shaped acceleration/deceleration is enabled by
setting two time constants (T
1
, T
2
) (parameter No. 522 to No. 525, and
parameter No. 952 to No. 955). In this case, the acceleration/deceleration
time will be as shown below.
Total time = T
1
+T
2
(1). . . . . . . . . . . . . . . . . . . .
Time for straight section = | T
1
–T
2
| (2). . . . . . . . . . . .
Time for curved section = MIN(T
1
, T
2
) (3). . . . . . . . . .
(3) (2) (3)
(1)
Time
Feedrate
Rapid traverse
Fig. 5.10 (b)
NOTE
Rapid traverse bell–shaped acceleration/deceleration
cannot be used with the 5th/6th axis and 7th/8th axis.
5.10
RAPID TRAVERSE
BELL–SHAPED
ACCELERATION/
DECELERATION
Explanations