I have a control application for the production of tubing. My problem is that the PID nodes that are currently available don't work well with a large "dead time" element. The time that it takes from a change in process control (changing the speed of the puller) to the measurement of the change is at…

First, I wonder whether we should take this off forum as we are getting further and further from node-red related issues. Is anyone else here watching this with interest? Your mention of pressure and wall thickness made me think a bit more about the physics and maths. With two variables to adjust…

I for one find this thread fascinating ! please continue. (or at least report back with the results...)

I am following to, it's very interesting.

OK, we will carry on here. I remember there have occasionally been mild admonishments when threads get too far off topic, as someone has to pay for the forum.

The wall thickness is measured ultrasonically in real time. Won't be able to test till Thursday or Friday unfortunately, I'll make sure to have results.

Can you put the thickness on the chart too? I would like to see how it varies and see whether my suggestion that the area is inversely proportional to speed is correct. Do you use Influx and Grafana for data capture and display? The great thing about that is that you can easily go back and look a…

I'd love to, but I have no idea how to do the data capture, we did run today with your PID and it worked flawlessly. They are going to run again tomorrow. I already had it set up to dump wall, diameter and feet into a file, I've added speed to it and I'm assuming you want to see the op value as well…

[image] Buzzylogic: I'd love to, but I have no idea how to do the data capture, Love to do what? Add the thickness to the chart or using Influx/grafana. If the former then I don't know what you mean. If the latter then, if you need to do it, then you have some googling and docs to read …

No idea how to use Influx/grafana. Would a .csv file be good enough?

Yes, csv will let me check the numbers look right. Also show us what you see on the chart in the dashboard.

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Looking for someone with PID node experience

General

fjura 20 May 2021 14:46 47

Kindly keep it here this is good info

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Looking for someone with PID node experience

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