S Curve 2-131
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%).
Time to Max Speed
Note that S-curve time is defined for accelerating from 0 to maximum
speed. With maximum speed = 60 Hz, Ta = 2.0 sec, and S-curve = 25%,
acceleration time is extended by 0.5 seconds (2.0 * 25%). When
accelerating to only 30 Hz the acceleration time is still extended by the
same amount of time.
Crossing Zero Speed
When the commanded frequency passes through zero the frequency will
S-curve to zero and then S-curve to the commanded frequency.
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
0.0 0.5 1.0 1.5 2.0 2.5 3.0
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
Seconds
Hz
-80.0
-60.0
-40.0
-20.0
0.0
20.0
40.0
60.0
80.0
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