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(Another) Poppery PID controller project
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purewater
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Joined: 14 Jul 2011
Posts: 1
Location: New York
Expertise: Just starting

Posted Thu Jul 14, 2011, 1:38pm
Subject: Re: (Another) Poppery PID controller project
 

Another place to look for this mesh if you are in searching for it, check out this place in NJ:

http://www.bwire.com/

Belleville Wire Cloth
Cedar Grove, NJ

They have all of the finer mesh that you are looking for in stock and ready to ship, I just bought a small piece of copper from them, and was very satisfied with the product.
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edcurry
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Joined: 27 Sep 2012
Posts: 3
Location: ATL
Expertise: I love coffee

Espresso: Rancilio Silvia with Auber...
Grinder: Baratza Vario
Drip: Braun 3116
Roaster: Modified PI with PID
Posted Tue Oct 2, 2012, 5:58pm
Subject: Re: (Another) Poppery PID controller project
 

Hi Dana (or anyone else who has implemented this type of P1 mod),

I am building out a unit with Auber components close to those specified in your original proposal. I have a 3 amp Variac to control fan speed so the final rig should be very similar to yours from a functional standpoint. I am curious what your roasting profile looks like now that you have had a bit of experience with the machine. I see lots of detailed profiles for drum based roasters but few for fluid bed and almost none specific to a modified P1. In particular I'm looking the progression you use for programming your PID. Ramp to x degrees F in y minutes, hold for z minutes, ramp ... etc. As it stands now, I'll be using the TC at the air inlet (MET) for programming purposes. Any suggestions will be appreciated.

Thanks,
Ed
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dana_leighton
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dana_leighton
Joined: 11 Jan 2002
Posts: 1,907
Location: Little Rock, AR
Expertise: I live coffee

Espresso: Isomac Relax; Caferina...
Grinder: Macap MXK; Baratza Vario-W;...
Vac Pot: Yama 5-cup
Drip: Technivorm; CCD; Melitta
Roaster: Poppery I w/PID controller
Posted Wed Oct 3, 2012, 5:04am
Subject: Re: (Another) Poppery PID controller project
 

Hi Ed.

My roaster is out of commission since I moved at the beginning of the year, and I can't remember the ramp profile that I programmed into the PID. Sorry. If/when I get it back into commission I'll post here.

Dana

 
Dana Leighton - Espresso hack and CoffeeGeek moderator
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Frost
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Frost
Joined: 26 Jul 2007
Posts: 2,047
Location: Sierra
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Lelit PL53
Roaster: Poppery I w/variac, MET, BT
Posted Thu Oct 4, 2012, 5:20pm
Subject: Re: (Another) Poppery PID controller project
 

I can give you a simple recipe to get you started in the right direction. Using the MET probe temps:

Preheat the roaster to 325F (300 to 350F max range)
Hold 325F for first 1-2 minutes of the roast.
Then Ramp MET at 25-30F per minute until 450-460F.
Hold 450-460F until roast completion.

If you are using a Bean Temp probe, this would help to respond to different beans so you might roast a tiny peaberry different than a Pacamara:

After the initial drying at 325F, always keep MET temps about 60-80F ahead of Bean Temps for the ramp phase to 450-460F.    Check BT rate of rise: 25-33F per minute is a good range to work.

Another rule of thumb: I look for 3-4 minutes for each phase of the roast; Drying(to 300F BT), Ramp to First Crack, and Finish,  for a total roast time of 9-12 minutes.  Faster for more lively, slower for more mellow.
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edcurry
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Joined: 27 Sep 2012
Posts: 3
Location: ATL
Expertise: I love coffee

Espresso: Rancilio Silvia with Auber...
Grinder: Baratza Vario
Drip: Braun 3116
Roaster: Modified PI with PID
Posted Sat Oct 13, 2012, 8:48am
Subject: Re: (Another) Poppery PID controller project
 

Thanks guys.

Dana, in an earlier post in this thread there is a link to your supply spreadsheet. It is now 404. Could you post that inline? I've figured out that the Auber PID I bought is either junk or not up to the task. Fuji is a bit too proud of their controllers so it looks like I'm going to give the Delta a try.

Second question: has anyone built out a controller using variable output voltage and and an SCR? I'm not finding a reasonably priced SCR. I'm guessing this would be total overkill for this if you guys are seeing input temperatures stable with a few degrees swing using pulse and SSR. I'm swinging in a 100 degree range with the Auber. I think it is built for much slower systems.

Thanks,
Ed
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dana_leighton
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dana_leighton
Joined: 11 Jan 2002
Posts: 1,907
Location: Little Rock, AR
Expertise: I live coffee

Espresso: Isomac Relax; Caferina...
Grinder: Macap MXK; Baratza Vario-W;...
Vac Pot: Yama 5-cup
Drip: Technivorm; CCD; Melitta
Roaster: Poppery I w/PID controller
Posted Sat Oct 13, 2012, 11:02am
Subject: Re: (Another) Poppery PID controller project
 

edcurry Said:

Dana, in an earlier post in this thread there is a link to your supply spreadsheet. It is now 404. Could you post that inline?

Posted October 13, 2012 link

OK I am trying to load it here. Excel is not listed as a supported file type, but lets see what happens.

I'm swinging in a 100 degree range with the Auber. I think it is built for much slower systems.

I would tend to think the swing is because of the P, I and D parameters you've got in the PID unit. Have you tried autotuning the PID? I did my autotune when the beans were at first crack temperature, then I adjusted the parameters slightly to reduce the swing.

 RoasterUnitBOM.xls

 
Dana Leighton - Espresso hack and CoffeeGeek moderator
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edcurry
Senior Member


Joined: 27 Sep 2012
Posts: 3
Location: ATL
Expertise: I love coffee

Espresso: Rancilio Silvia with Auber...
Grinder: Baratza Vario
Drip: Braun 3116
Roaster: Modified PI with PID
Posted Sat Oct 13, 2012, 6:19pm
Subject: Re: (Another) Poppery PID controller project
 

Thanks Dana, that file doesn't seem to have valid contents. Not a big deal I was just trying to figure out what you type of interface was needed to access the controller via serial or usb.

As for settings on the PID, I have tried its auto-tune several times and various manual adjustments. I think the design of the unit I am using is simply too slow for this application. Replacing it with one that I know will work won't break me.

Thanks,
Ed
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