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Armadillo852

PowerFlex 40 Accel Time

6 posts in this topic

I have a powerflex 40 with a 22E-comm module on it. I would like to set different accel and decel rates based upon which direction the drive is commanded to go. Is this possible?

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Yes this is possible. Refer to the Advanced Program Group, specifically Option 1 for A051 to A054, which will toggle between ACC/DEC 1 and 2 (page 3-14 of the PF40 User Manual). You want to have your two decel times programmed into P040 (Decel 1) and A068 (Decel 2), set A051, A052, A053 or A054 for Option 1 (ACC & DEC 2). Thus when that input (A051, A052, A053 or A054...whichever you used) is high, ACC2 & DEC2 is used; if that inputs is low, ACC1 & DEC1 is used. Remember to duplicate your accel times even though the decel times change (both ACC and DEC 1 or 2 are used). I think the input will have to be hardwired, but I seem to remember there is a way to map that input to an input from the Ethernet/IP bus from your PLC.

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Armadillo852, Yes it is possible to use different accel and decel time. What you can do is, A) If you only need two ramps. 1) Set your other accel/decel time 2. Parameter A067/A068. 2) Set A051 (Digital In# Sel) as options1 which is acc & Dec 2. This way when you enable or trigger digital In#, the drive will automatically switch to accel/decel2 ramp. Other method is to write to the drive parameters in your program. Look at this link http://rockwellautomation.custhelp.com/app/answers/detail/a_id/24406/related/1/kw/20-comm%20E/r_id/113025 Hope this help. PowerFlex70.ACD PowerFlex70 on Ethernet.doc

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ok, It was easy to do in the PLC as we are already sending speed to the drive via ethernet. Just had to set the proper outputs. Works just like I wanted. Thanks for the replies guys. Edited by Armadillo852

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Ok, guess it didn't work. It changed the accell and decel times for all drives. Might be the way we do our ethernet comms. Take a look and see what you think. Drive.ACD

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I seem to recall that in some of the drives, it is possible to set up 4 profiles and calll them by number over Ethernet. My docs are in another building right now. Sorry I can't be more specific. Bob A.

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