User manual

278 Rockwell Automation Publication MOTION-UM003F-EN-P - March 2015
Appendix C Program
The following trends show how the axis stops and starts with a trapezoidal profile
and an S-curve profile.
Corrective Action
Use the same deceleration rate in the instruction that starts the axis and the
instruction that stops the axis.
Start while decelerating and reduce the deceleration rate
Trapezoidal S-curve
The axis speeds back up as soon as you start the jog again. The lower
deceleration doesn’t change the response of the axis.
The jog instruction reduces the deceleration of the axis. It now takes longer to bring
the acceleration rate to 0. The speed overshoots 0 and the axis moves in the
opposite direction.