Rockwell Automation 20B PowerFlex 70, PowerFlex 700 Reference Manual - Manual (Page 152)

S Curve
152 Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013
S-Curve Selection
S-curve is enabled by defining the time to extend the acceleration and
deceleration. The time is entered as a percentage of acceleration and deceleration
time. In this case acceleration time is 2.0 seconds. The line on the left has s-curve
set to 0%. The other lines show 25%, 50%, and 100% S-curve. At 25% S-curve
acceleration time is extended by 0.5 seconds (2.0 * 25%). Note that the linear
portion of this line has the same slope as when s-curve is set to zero.
The acceleration and deceleration times are independent but the same S-curve
percentage is applied to both of them. With S-curve set to 50%, acceleration time
is extended by 0.5 seconds (1.0 * 50%), and deceleration time is extended by 1.0
seconds (2.0 * 50%).
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Seconds
Hz
-80.0
-60.0
-40.0
-20.0
0.0
20.0
40.0
60.0
80.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Seconds
Hz
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Seconds
Hz
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0