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Homeroasters - Home Roasting Coffee Community » DATALOGGERS - CONTROLLERS - RATE OF RISE METERS » Dataloggers/Controllers/Rate of Rise Meters

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Turbo oven and TC4 roaster controls
fullofdays	#1 Posted on 10/08/2012 2:17 PM
Newbie Posts: 12 Joined: September 10, 2012	I'm interested in modifying my SO2007 Turbo oven in order to control the heating element. Basically, I'm looking at using two TRIAC's to provide variable power to control my turbo oven. One TRIAC to provide variable power using phase angle control. The other can be set up to use a close relative of PWM called integral cycle control (ICC). What I have found in my research is that one way ICC is implemented on the TC4 system is that it sequentially looks at every half wave of the AC power and decides whether that wave should be on or off, depending on the output level requested by the user. There's a few guys that did this on a quest machine... http://nselabs.wordpress.com/projects/coffee-roaster-controls/ Because I'm not an electrical engineer, I need to understand what I need to modify my turbo oven with TRIAC's and also the hardware/software setup for ordering the TC4. Any ideas here? Thanks!


greencardigan	#2 Posted on 10/08/2012 6:09 PM
1 1/2 Pounder Posts: 1185 Joined: November 21, 2010	That's a good article you linked to there! That system uses essentially the same parts as the TC4 system. Have a look at Jim's TC4 system wiring diagram. It shows all the parts required to do phase control and ICC control of a Quest roaster. I'm not familiar with the SO2007 Turbo Oven though. http://www.mlgp-l...111120.jpg Jim has shown the heater and fan connected to SSRs instead of triacs like the article in your link but either way will work. SSR's are probably easier and safer. There are a few variants of software for the TC4 that each offer different features. You've probably seen some of the TC4 threads here or the software info on the TC4 google code site. http://code.googl...c4-shield/


fullofdays	#3 Posted on 10/09/2012 10:32 AM
Newbie Posts: 12 Joined: September 10, 2012	Thanks for the links. Can you explain to a novice why SSR's are easier and safer than Triacs? Has anyone fully built a Turbo oven in this manner? I've seen some Variacs setup to control temp...


bvwelch	#4 Posted on 10/10/2012 10:56 AM
1 1/2 Pounder Posts: 1064 Joined: December 27, 2007	When I use the term Triac, I am talking about a low-level circuit with lots of exposed connections and possibility of mis-wiring, etc. When I think of an SSR, I am thinking of a higher-level device that has its circuits enclosed in a case with very few contacts exposed. Also it should include a detailed description of its intended use. Both would likely require a hefty heat sink and both pose a serious shock risk so keep one hand in your pocket at all times. Assuming you split any fan circuit from your heater circuit, it seems reasonable to me that you could control the heat with an SSR. When I first started trying to tinker with DIY coffee roasters, I had assumed that Triacs would be cheaper than SSRs, but that is not true. Looking back, it would have been better to go with SSR. Variacs, assuming you get a hefty one, are great for manual control, but if you want to use a TC4 for logging anyway, you can avoid the cost of the Variac by using a SSR for heat control.


fullofdays	#5 Posted on 10/10/2012 11:30 AM
Newbie Posts: 12 Joined: September 10, 2012	This is a huge help. Thanks Bill. I am amazed at all the wise folks on this forum who make it such a great place. cheers

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