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Hello Ron,
I have tried to post the .rsp file but it is still to large even zipped. Can I email you the file? PM me with your email address and I will send it to you.
As for the trend I do have one set up already. I am using wonderware for my HMI screens. I have on there a trend of my actual and averaged draft reading. I will get a picture of the trend for you to show you how it looks right now. I will try to get this posted soon.
Now on to the update time. You are correct, there is no trigger on the pid block. Needing a trigger (on a PLC-5 system), is something that I just learned by reading these posts. I guess the guy that set these up before me didnt know that you needed triggers either. All of my pids on my system were set up without triggers. This is something that I need to change.
For the update time, reset time, and derivative values, are these all in seconds or milliseconds?? I thought that I read a post saying that these were in ms. Maybe I had it confused with a different type of system.
For the proportional gain and the integral/reset settings. I think theses setting are way off. After reading your post on how the integral setting works I asked myself the same question as you. How is this even working? It is very slow reacting (actually too slow)but it does for the most part work. Im think you are right that it has alot to do with the update time and not having a trigger on the pid.
I would like to get this fan reacting alot faster that it is right now but I cannot have it overshooting the sp or oscillating around the setpoint. This would cause instabillity on the flame in the kiln. I guess that is why I was asking about the derivative, and how it works. Even if I would not need this value on this particular pid I would still really apriciate you describing it to me.
This particular pid loop I have been working on and trying to fix for a long time. Thank you again for all the help on this.
I have tried to post the .rsp file but it is still to large even zipped. Can I email you the file? PM me with your email address and I will send it to you.
As for the trend I do have one set up already. I am using wonderware for my HMI screens. I have on there a trend of my actual and averaged draft reading. I will get a picture of the trend for you to show you how it looks right now. I will try to get this posted soon.
Now on to the update time. You are correct, there is no trigger on the pid block. Needing a trigger (on a PLC-5 system), is something that I just learned by reading these posts. I guess the guy that set these up before me didnt know that you needed triggers either. All of my pids on my system were set up without triggers. This is something that I need to change.
For the update time, reset time, and derivative values, are these all in seconds or milliseconds?? I thought that I read a post saying that these were in ms. Maybe I had it confused with a different type of system.
For the proportional gain and the integral/reset settings. I think theses setting are way off. After reading your post on how the integral setting works I asked myself the same question as you. How is this even working? It is very slow reacting (actually too slow)but it does for the most part work. Im think you are right that it has alot to do with the update time and not having a trigger on the pid.
I would like to get this fan reacting alot faster that it is right now but I cannot have it overshooting the sp or oscillating around the setpoint. This would cause instabillity on the flame in the kiln. I guess that is why I was asking about the derivative, and how it works. Even if I would not need this value on this particular pid I would still really apriciate you describing it to me.
This particular pid loop I have been working on and trying to fix for a long time. Thank you again for all the help on this.