User manual

Rockwell Automation Publication MOTION-UM003F-EN-P - March 2015 273
Program Appendix C
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 slow
down.
• If you reduce the acceleration, it takes longer to get acceleration to 0.
• In the meantime, the axis continues past its initial target speed.
The following trends show how the axis stops with a trapezoidal profile and an
S-curve profile.