Accel Curve

PLCdude93 · May 6, 2019

How can I make a powerflex 750 follow a curve like this? Doesn't have to be this exact curve, just something similar.

g.mccormick · May 6, 2019

Is that a velocity/rpm/other graph? I assume it is not an accel graph since the line goes to constant value that is not zero. How are you controlling the drive?

PLCdude93 · May 6, 2019

Y axis is rpm, X axis time. So accel to and remain at ex.500RPM. The decel would need to follow the same curve.

The drive is controlled by a control logix processor.

Peter Nachtwey · May 6, 2019

PLCdude93 said:
Y axis is rpm, X axis time. So accel to and remain at ex.500RPM. The decel would need to follow the same curve.

The drive is controlled by a control logix processor.

In how much time or distance?
Normally people want a s-curve.
What is shown is not an s-curve.

dev67 · May 7, 2019

I don't work with these very often but I think they tend to use s-curve by default during accel and decel. But I'm sure they have settings available to modify this behavior. Start reading dude. PowerFlex 750 Manual, PowerFlex 750 Programming Manual

Mispeld · May 7, 2019

Depending on your process requirements and tolerance, one approach would be to use a timer in your ControlLogix processor to update the command speed according to the rpm versus time curve until it reaches the final speed.

mdim · May 7, 2019

Never played with the PCAM of PF755, but I know it is in the settings. Maybe a little reading of the manual will help.

shooter · May 7, 2019

put the setspeed above the maxspeed and set maxspeed to your value, now the system will try to accel what you want, however the accel will be stopped by the maxspeed.

Accel Curve

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