PID Velocity vs Positional Equation - Studio 5000 PIDE Instruction

[@hassanrabbaniboyka]

More videos on PID. Make a series on PID . Thank you for this video

[@TimWilborne]

Here you go! twcontrols.com/pid-control-proportional-integral-derivative

[@alnaseri3622]

Tim, you remind me of my professor in college. if we got him a report with 100 pages and one of the references was Wikipedia, he will toss the whole thing in the trash and zero us 🤣🤣🤣. Totally agree with you. In technical fields, the best reference is the manufacture of the product and especially Rockwell almost never goes wrong with their material.

[@TimWilborne]

Yes, that reference guide was well written by Rockwell.

[@Chicken312]

Hi Tim, First, I'd like to thank you for all your videos-they have helped me countless times! You do great work! I'm currently working on a project for an extrusion control package and have been struggling with the PIDE setups, which I'm sure you hear a lot. The issue I'm facing is extremely long lag times, sometimes up to 15 minutes. I've tried auto-tuning multiple times, but it keeps timing out. Despite these challenges, I have managed to get everything working reasonably well, but it's far from perfect. The main problem is the PIDE locking up at 100% output if the die zone doesn't reach the set point for a couple of hours. I've looked into anti-windup strategies, but I can't figure out how to implement them correctly-if that's even the right approach to fix this issue. Any advice or guidance you can offer would be greatly appreciated. Best regards, Derek

[@TimWilborne]

Hi Derek. What do you have your limits set to?

[@Chicken312]

@@TimWilborne 😃 If your referring to the cv limits their set 0-100%.

[@ivanodivano96]

Same problems. How did you resolve ???

[@robertoguerra5375]

Thank you for this video… I used PID with only P, no I, no D in a function block diagram and it doesn’t work as expected… then I see how CV is calculated… oh! It slowly creeps up if the PV is under the SP… but how do I know that the CV will stop when the process has reached the desired temperature? 🤦🏾

[@TimWilborne]

With proportional only, it won't necessarily

[@syedmd.5712]

Sir why did you skip the D of the PID, as a controls engineer I really wanted to see the enhanced response time from PIDE in real time with the use of the Kd gains. Request to kindly upload putting up a disclaimer that some controls engineering background is required.

[@TimWilborne]

No engineering background will be required for the derivative. I just didn't like a few things about the video and haven't got around to reshooting it.

[@syedmd.5712]

@@TimWilborne Would definitely look forward to it. Thanks for uploading so much information in so much depth for free.

[@simonjames3421]

I too am looking forward to the next video in this series! Thanks for your videos and keep up the great work.

[@timhampson9060]

Ditto, Eagerly waiting for the "D" video

[@jimpapadimitriou6957]

Tim, can you do a video of tuning the velocity form of the equation manually, not using autotune? that would be terrific.

[@TimWilborne]

Probably not, I do have a derivative video if I ever finish it.

[@Enigma758]

Hi, thanks for the video. So the Wikipedia article is correct, it's just "different" thant RA's implementation, correct? (BTW, I do work for RA, but that doesn't necessarily make me a PID/PIDE expert :) ).

[@TimWilborne]

Incorrect. There are numerus different PID equations. It this level, you can't be looking to Wikipedia as a reliable source of information.

[@Enigma758]

@@TimWilborne So the issue is that they have just picked a specific one (a textbook PID), without mentioning that there are many different variations, right? Or are you also saying that the one they explained isn't correct to begin with? Thanks.

[@bradthompson1209]

Here's a link to the RA paper. literature.rockwellautomation.com/idc/groups/literature/documents/wp/logix-wp008_-en-p.pdf

[@TimWilborne]

Yep, it is in the description also with some other helpful links 😁