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Sestos PID with Saeco Aroma - questions on PID interface
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LenP
Senior Member


Joined: 3 Jan 2012
Posts: 4
Location: Connecticut
Expertise: I love coffee

Espresso: Saeco Aroma, Handpresso
Grinder: Rocky
Drip: Aeropress
Roaster: popcorn maker
Posted Sat Jan 14, 2012, 7:28pm
Subject: Re: Sestos PID with Saeco Aroma - questions on PID interface
 

Ha!  It's been 20 years since my electrical engineering degree.  Looking at the PID instructions is making my head spin.  I have not started the wiring - still trying to make sense of which wires go where!
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ampguy
Senior Member
ampguy
Joined: 23 Apr 2010
Posts: 121
Location: Pac NW
Expertise: I like coffee

Posted Sat Jan 14, 2012, 8:24pm
Subject: Re: Sestos PID with Saeco Aroma - questions on PID interface
 

Len, it's pretty simple, you're just bypassing the brew thermostat with the pid controller and SSR. The SSR is basically a switch.

First get your hook up wire (16 gauge, start with 1 to 2 ft. pieces, can shorten later) and spade connectors and wire cutters. Then hookup the pid inputs to the power switch on the Saeco, so that when the switch is on, the pid is on. There should be no reason for the pid to be on when the machine is off, right?

Then when you have those connected, start hooking up the SSR and Thermocouple to the PID, but start off with hooking up the PID to the Saeco power switch, so when the switch on the Saeco goes on, the pid powers on.

Let me know if you need help with this first step.


LenP Said:

Ha!  It's been 20 years since my electrical engineering degree.  Looking at the PID instructions is making my head spin.  I have not started the wiring - still trying to make sense of which wires go where!

Posted January 14, 2012 link

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Stereo
Senior Member


Joined: 29 Apr 2012
Posts: 1
Location: Luxembourg
Expertise: I live coffee

Posted Sun Apr 29, 2012, 11:56pm
Subject: Re: Sestos PID with Saeco Aroma - questions on PID interface
 

Hi ampguy,

We seem to have very similar setups. Did you manage to find the perfect settings for the controller? At M50=340, P=140, t=33s and Ctl=0 it takes some time to settle back down after pulling a shot, ages after steaming. If I lower my M50 to improve recovery, it overshoots and never really settles at all. The autotune overshot a lot when I tried it; I stopped it when it was at nearly 140C and whistling like a steam train!
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ampguy
Senior Member
ampguy
Joined: 23 Apr 2010
Posts: 121
Location: Pac NW
Expertise: I like coffee

Posted Mon Apr 30, 2012, 8:50am
Subject: Re: Sestos PID with Saeco Aroma - questions on PID interface
 

I have mine set at about 90 C, but I'm pretty sure this will vary with the slightest bit of different placement of the sensor.

I'll check my values the next time I have the system on the counter. Right now it's off the counter.
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