326 Rockwell Automation Publication MOTION-UM003K-EN-P - January 2019
Appendix B Out of Box Configuration for PowerFlex Drives
Look For
Cause
When you use an S-curve profile, jerk determines the acceleration and
deceleration time of the axis. An S-curve profile has to get acceleration to 0
before the axis can speed up again. The following trends show how the axis
stops and starts with a trapezoidal profile and an S-curve profile.
Corrective Action
If you want the axis to accelerate right away, use a trapezoidal profile.
The instruction that stops the axis keeps the
S-curve profile. Suppose that you use an MAS
instruction with the Stop Type set to Jog. In
that case, the axis keeps the profile of the
MAJ instruction that started the axis.
The instruction that
starts the axis uses an
S-curve profile.
Start While Decelerating
Trapezoidal S-curve
The axis speeds back up as soon as you start the jog again. The axis continues to slow down until the S-curve profile brings the acceleration
rate to 0.
stop
jog
speed goes down
until acceleration is 0
acceleration
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