adccommunitymod (AutomationDirect) asked a question.
Winder control
Created Date: February 08,2009
Created By: dapperdan7125
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I am trying to write a program for winding plastic film. I am using GS2 drive to run my spindles. I have had sucess for the most part. I have trouble controlling the wind while the machine is cycling to a new roll. I am not using a PID loop to control the speed.I am thinking of trying that, should I use the PLC loop or the drive loop? Anyone have any suggestions?
Created Date: February 08,2009
Created by: KPrice
Generally speaking, I prefer to do the PID in the PLC, instead of in a device external to the PLC. (I'd rather do the PID in the PLC instead of in the VFD, pH controller, temperature controller, for example.) You have more options in the PLC for control, tuning, operator interface, monitoring, etc. However, for some devices like motion control, or 3rd-party, proprietary, stand-alone control, the control is done in the device.
When you say you 're controlling speed, what exactly is your process variable, RPMs, ft/min, web tension, drum torque, "dancer " position? Look at some previous posts. There have been a number of posts here from experts in the business concerning web tension. Have you looked at proprietary, stand-alone wind-up controllers?
Created Date: February 09,2009
Created by: dapperdan7125
Thanks, I am starting now to look at the stand alone web controllers, my process variables are fpm and tension. I was thinking of using "dancer " position as my PV.
Created Date: February 08,2009
Created by: dapperdan7125
I am trying to write a program for winding plastic film. I am using GS2 drive to run my spindles. I have had sucess for the most part. I have trouble controlling the wind while the machine is cycling to a new roll. I am not using a PID loop to control the speed.I am thinking of trying that, should I use the PLC loop or the drive loop? Anyone have any suggestions?