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| 2/16/2009 8:09 AM | |
Joined: 3/21/2006 Last visit: 3/30/2025 Posts: 10239 Rating:
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Hello Try in this way:
Also use this FAQ: What should you watch out for when calling and assigning parameters to the controller functions in function blocks (S)FB41, (S)FB42 and (S)FB43? Hope this will help you. regards |
| 2/17/2009 8:18 AM | |
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Posts: 13 Rating:
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Tks your help, I will try to do follow your help. |
| 2/17/2009 10:16 AM | |
Joined: 9/27/2006 Last visit: 9/4/2025 Posts: 12397 Rating:
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Hello binh; One word of caution: a winder/unwinder is a non-linear application. By that I mean that the physics of the process are not linear within the range of the control you wish to establish. Mass varies with the roll diameter (which changes during the process, obviously), acceleration ans decelleration curves have to be taken into account at the beginning and end of therapplicsation and the model of the process you are trying to adapt to also changes as the application evolves. The control parameters will be different if you decide to control on different variables, such as line speed, inertia, tension, torque... Look at the information available on the web, such as here, So the gain values you select for different points of your winderin your process evolution might not be adequate for other sets of points. Adjustment of the parameters for the middle of the roll only could lead to instability (oscillations) at another point. You might have to select different gains tested for different points and load them into your PID loop as your process evolves. It is not a perfect solution, and requires a lot of testing and adjustments, and does need adjustment if any of the physical parameters of the process change,but we have done something like this on an old wire winder (tension controland web break were not a great issue). If you need something more precise and robust for controls, you could use the onboard PID controls of your drive, as proposed by Siemens in the following application note: http://support.automation.siemens.com/WW/view/en/22095333 Hope this helps, Daniel Chartier |
Last edited by: O_Moderator at: 9/16/2010 2:59 PMlink edited Last edited by: dchartier at: 2/17/2009 10:50 AM |
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| 2/19/2009 5:29 AM | |
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Joined: 9/27/2006 Last visit: 9/4/2025 Posts: 12397 Rating:
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Hello bihn; I have found the following application note for a 6RA70 as a Center Winder, on Siemens' support pages (see the profduct Support link at the top of this page): http://support.automation.siemens.com/WW/view/en/9716319 I am not very familiar with the Simoreg 6RA70, unfortunately, so I will not be able to help you with the details of the application. But the manual seems to discuss using the internal PID control of the drive to optimize the winder control, based on speed, tension and torque, which should give you a good balancein your design. I hope your study of this document will give you more insight on this type of application. If you have specific details required on the parameters or communictaions of the Simoreg, come back to the forum, where other specialists may have your answers. Also please look at the support link at the top of the page to look for more manuals ansd application notes on the drive. Hope this helps, Daniel Chartier |
| 2/20/2009 7:00 AM | |
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Posts: 13 Rating:
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Dear Chartier, Tks Binh |
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