JGG Senior Member Joined: 31 Mar 2006 Posts: 1,344 Location: Kentucky, US Expertise: I like coffee
Espresso: PID Silvia; PID Alexia Grinder: Mazzer Mini E (A), SJ; Rocky... Roaster: Hottop D w/PID; Thermometric...
Posted Mon Nov 5, 2012, 12:46pm Subject: Re: Quest M3 Roaster - New Asymmetric Heating?
If the heater power is regulated by a triac circuit (using phase angle control), then your Kill-A-Watt may not be able to measure either the watts or the power factor correctly. The chopped sine wave may be fooling it?
Not sure if it's a triac or thyristor (or whatever). In any case, I'm relieved to see now my Quest is getting less than the 1000W at the heaters when pulling 10A (and not 1200W or rather VA, as I originally thought).
So am I right to assume because the controller limits the real power by 20%, the roaster can safely use a 100V x 600W heater operating 20% beyond the voltage spec? If that's the case, I'll likely keep the hotter left 100V heater, since I prefer to have the extra heat for larger batches.
Endo Senior Member Joined: 26 Jun 2008 Posts: 804 Location: , location, location. Expertise: I love coffee
Espresso: machine is < important than... Grinder: !
Posted Tue Nov 13, 2012, 7:22pm Subject: Re: Quest M3 Roaster - New Asymmetric Heating?
This graph from my kill-a-watt might give people a better idea of how the power control works on my Quest.
I typically run between 9A and 10A (with 120V) for a 150g to 200g roast, but I can go all the way to 10.5A safely without exceeding the max power rating of 1050W (because of the phase fired controller).
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