Parker ac890 - Page 532

Programming
Page D-182 890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
8
9
10
A
B
C
D
E
1
2
3
4
5
6
7
Functional Description
The time needed to stop or accelerate is:
As the speed is symmetrical, the average speed is V/2 therefore the stopping / acceleration distance can be calculated:
s
V V
A
A
J
= +
2
[Meters]
t
V
A
A
J
= + [Seconds]
V is the maximum speed the drive must reach in % / sec.
A is the maximum allowable acceleration in %/sec
2
.
J is the maximum allowable value for jerk, in %/sec
3
Note: These only hold true if Jerk = Jerk2 for acceleration or Jerk 3 = Jerk 4 for deceleration.
-30
0
1
20
30
40
50
60
Time (secs)
%
Jerk 3
Jerk 4
Jerk 2
Jerk
Acceleration
Deceleration