Home Brew Forums > Home Brewing Beer > DIY Projects > Brew Stands > RIMS circulation temp overshoot
Reply
 
Thread Tools
Old 02-04-2011, 07:24 PM   #11
kevin0
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2011
Location: annapolis, maryland
Posts: 13
Default

If you want to control overshoot, it may help to lower to proportional gain on your controller (the 'P' in 'PID'). Increasing the 'I' gain should get help rid of steady state error.


kevin0 is offline
 
Reply With Quote
Old 02-04-2011, 07:32 PM   #12
CodeRage
Death by Magumba!
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
CodeRage's Avatar
Recipes 
 
Join Date: Aug 2007
Location: Melbourne, Fl
Posts: 2,254
Liked 41 Times on 20 Posts
Likes Given: 5

Default

Sounds like a tunning issue to me. The probe is in the correct spot then. If it was in the mash you introduce a lot of lag to the response time, hence jmer's method.

A forward feed from the mash tun would allow you to reach your temp a little faster but, I haven't seen any economy priced PID controllers that support that.

If you're fluctuating 2 deg F at the RIMS tube by the time it reaches the mash it will average out rather quickly.

Oh, I bet I know what you're problem is! There is a time variable that you need to set some times. This is how long the output should stay on at a minimum. I think Auber PIDs default to 2 seconds. If you set that variable to 0 it goes down to 0.5 seconds minimum on time. This is for things like compressors so you dont short cycle the hell out of them. If you have a different PID read the manual and look for a minimum on time variable.

What happens is the overshoots but cant turn the element off because it hasnt been on long enough.
__________________
Brutus 20e build | Electrical Primer for Brewers | Auber SYL-2362A2 PID Install & Config
So as I am walking out the door this morning I think to my self:
"self, going to work on Monday is like knowing you're going to get kicked in the nuts. You just don't know when or by who"
CodeRage is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Keezer builds and circulation fans. hukdizzle Kegerators and Keezers 23 05-31-2014 04:05 PM
Digital temp controller for RIMS bulldogxray Brew Stands 3 12-26-2010 05:45 PM
To RIMS or not to RIMS...that is the question. Dgonza9 Brew Stands 12 08-24-2010 10:01 PM
rtd rims polecreek Brew Stands 3 12-20-2008 07:46 AM
digital probes for temp controls on herms/rims nathan Brew Stands 1 12-13-2008 03:10 PM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS