The Great Bottle Opener Giveaway

Home Brew Forums > Home Brewing Beer > DIY Projects > Anyone know a cheap PID with analog output?

Reply
 
LinkBack Thread Tools
Old 02-05-2011, 12:01 PM   #31
RukusDM
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2010
Location: Rochester, New York
Posts: 441
Liked 8 Times on 7 Posts
Likes Given: 2

Default

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.

__________________

Primary's:
#1 - 5 Gallons Harp Clone All Grain with Wyeast 2007 Lager (~5.5% ABV)

Secondary's:
#1 - 6 Gallons Dry Irish Stout Partial (~4.0 ABV)
#2 - 6 Gallons Brown Sugar Ale All Grain with Nottingham Yeast (~5.0% to 5.2%)

Kegged:
6 Gallons Honey Ale AG

Next:
6 Gallons Brown Sugar Lager

RukusDM is offline
 
Reply With Quote Quick reply to this message
Old 02-05-2011, 06:19 PM   #32
kladue
Senior Member
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2006
Location: Turner, Oregon, Oregon most of the time now
Posts: 2,302
Liked 45 Times on 42 Posts

Default

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.

__________________
kladue is offline
 
Reply With Quote Quick reply to this message
Old 02-06-2011, 04:30 AM   #33
kshuler
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
kshuler's Avatar
Recipes 
 
Join Date: Mar 2010
Location: Seattle, WA
Posts: 281
Liked 4 Times on 4 Posts
Likes Given: 2

Default

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!

Klaus

__________________
Quote:
Originally Posted by Beer_Maker View Post
Light travels faster than sound. This is why some people appear bright until you hear them speak.
You can't reason someone out of a position they didn't reason themselves into.

-------------------------------------------
http://www.bokehtests.com
http://web.mac.com/kshuler/Site/Welcome.html
kshuler is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
PID Relay output driving an SSR? onelegout DIY Projects 9 09-01-2010 03:57 PM
Output Voltage Of Ranco Controller Cold_Steel DIY Projects 4 08-19-2010 06:14 PM
Nothing on the output side of my SSR???? Krelja DIY Projects 10 06-22-2010 01:40 PM
SSR Heat Output? RonRock DIY Projects 9 02-08-2010 03:35 PM
Should I move my MLT Output to the bottom? Eigenmusic DIY Projects 1 09-24-2009 02:01 PM