Derivative is used in certain specific applicatiopns, eg boiler freedwater pumps, but generally, yes, avoid.
If you want good fast loop performance without overshoot don't forget the posicast.
Finally, PID loops are not everything, ask yourself "do I really need a setpoint that is maintained to 1% or better, or do I really just not want to overflow the tank?" If the latter, a ratio control can often be simpler, easier and most noteably not pass on as much process disturbance down the line leading to the plant settling out quicker.
Thanks for the feedback, hope you enjoyed reading it.
Looks like you have a process engineering background, I am not familiar with a ratio controller actually, good to know.
Maybe for our next article I should dive in deeper how to avoid overshoot and what methods there are (eg. posicast, simple speed damper, ..)
We are making a series of more technical articles with Marple at the moment. This time it was my time to shine!
We often see engineers struggle to get some PID controllers working. We know a thing or two about it, so we want to share it with the world! I wrote a short 4 step guide on how I think you can tune a simple PID controller and also shared some thoughts.
airbreather|3 years ago
If you want good fast loop performance without overshoot don't forget the posicast.
Finally, PID loops are not everything, ask yourself "do I really need a setpoint that is maintained to 1% or better, or do I really just not want to overflow the tank?" If the latter, a ratio control can often be simpler, easier and most noteably not pass on as much process disturbance down the line leading to the plant settling out quicker.
MBaert|3 years ago
Maybe for our next article I should dive in deeper how to avoid overshoot and what methods there are (eg. posicast, simple speed damper, ..)
MBaert|3 years ago
We often see engineers struggle to get some PID controllers working. We know a thing or two about it, so we want to share it with the world! I wrote a short 4 step guide on how I think you can tune a simple PID controller and also shared some thoughts.
Let me know what you think :)