HOMEBREW Digest #5915 Wed 14 March 2012

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  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. Return to table of contents
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