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	FORUM ON BEER, HOMEBREWING, AND RELATED ISSUES
		Digest Janitor: pbabcock at hbd.org


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Contents:
  Re: PID ("Devonna Dieterle")


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Date: Wed, 14 Mar 2012 05:14:34 -0400
From: "Devonna Dieterle" <djdieterle at hughes.net>
Subject: Re: PID

"The arguments I gave above, the simulation I ran and most important, the
fact that I have three channels of PID control in my brewery that use on/off
output with a PID algorithm make it clear that this guess is not a  good one
at all. We might also ask ourselves why, if this guess had any validity,
manufacturers would offer this output mode in a PID controller."

 

"The only way to do this is during a mash and the autotune 

feature of your controller is interested in auto tuning - not mashing so 

you will probably have to waste the grain used to obtain the tuneset. 

Tuning for water in the mashtun has not worked for me. As a consequence 

I control the mash and decoctions manually (pedally actually  - I have a 

pedal switch I step on to turn on the steam). All the controller does is 

take and display temperature readings."

 

 

AJ the only reason I entered the conversation was the second quote from you
posted a few days back regarding pid tuning, it seems to be in direct
conflict with the first quote above posted yesterday. 

 


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