328 Rockwell Automation Publication MOTION-UM003K-EN-P - January 2019
Appendix B Out of Box Configuration for PowerFlex Drives
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.
stop
jog
deceleration
changes
speed overshoots 0 and axis
goes in opposite direction
In a MAS instruction, set Change Decel to
Yes. The axis uses the Decel Rate of the
instruction.
Use the same deceleration rate in both
instructions.
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