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Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers and Stir Plates > Anyone know a cheap PID with analog output?
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Old 02-05-2011, 01:01 PM   #31
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regarding the use of ramping. You may want to use it. If you turn the controller on without ramping, you end up hammering the Controller with a huge error in the beginning. Depending on the response of the system, you could end up with Integral windup. This can cause large overshoots as the system tries to come into control

Derivative can also be used to minimize overshoot. It may take a while to get the gains set for your system, so a couple run throughs with water will help. I didn't read the manual but most controllers have auto tune these days and can help minimize the screwing around generating the right gains.

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Old 02-05-2011, 07:19 PM   #32
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A suggestion would be to move the proportional valve to the coolant circuit instead of the wort circuit as it would not catch hop and cold break particles which would be a sanitation "oops" later. As to auto tune, it may or may not work, it depends on the response time to coolant flow change and time to transit heat exchanger to see response at temperature sensor. It is going to be interesting to see how this works as it can not be simulated and tuned before operation.
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Old 02-06-2011, 05:30 AM   #33
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Well, thanks everyone for the advice. I will wait until I get all the parts and then give it a whirl. I have 2 brew days coming up this week, but I won't be ready yet to use the setup. It will probably be a month or more before I get the chance again, and I will update as things happen.

Again, thanks everyone!

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