[Homeroast] broken behmor question

Rich rich-mail at octoxol.com
Sat Apr 28 17:12:06 CDT 2012


It would be nice if the actual code was available so these questions 
could be answered. Foe example, is 70% power controlled by a setdown in 
the cavity temp sensor trip point or is power cycled to the heating 
lamps for a 70% duty cycle?

On 04/28/2012 03:11 PM, John Nanci wrote:
> Ah. If that is what Ira means, then, no, to my knowledge and experience
> it's a mis-interpretation of the manual. 70% is not 70% on/30% off. It's
> heating until it is 70% of the maximum temperature.
>
> I've checked with Joe, and he confirms this...but I've been wrong
> before, but it is my remembered experience.
>
> John
>
> At 01:02 PM 4/28/2012, you wrote:
>> My understanding (and presumably Ira's) is that the profiles are not
>> regulated by the
>> temp. sensor. They are simply a % power. The elements cycle on and
>> off to achieve
>> the lowered power. So during the 70% portion of a profile the
>> elements would be on
>> 70% of the time. The effect of the temp cutofff is just to prevent
>> the chamber temp
>> from exceeding a certain max temp. So if it's an "on" time interval
>> for the element
>> but the max temp is exceeded it won't come on.
>>
>> Did this make any sense??
>>
>> I haven't fiddled with the internals, so don't know how it "really"
>> works, but this has
>> always been my understanding and is consistent with my experience in
>> using it.
>>
>> Doug
>>
>> On Sat, Apr 28, 2012 at 10:44 AM, John Nanci
>> <john at chocolatealchemy.com> wrote:
>> > That is an interesting way to look at it. That the profiles work but
>> the
>> > elements don't turn off. Sounds like the profiles don't work if the
>> > elements don't turn off :)
>> >
>> > Sure, I guess it can be said it tries to follow the profiles, but
>> the result
>> > is P1 (with no temp limit) all the time.
>> >
>> >
>> >
>> > At 02:26 PM 4/26/2012, you wrote:
>> >>
>> >> At 11:35 AM 4/24/2012, you wrote:
>> >>>
>> >>> Yep, what that does is trick the system into thinking that the
>> roaster is
>> >>> cool, so it keeps the elements on all the time....at the expense
>> of any and
>> >>> all automated control or profiles
>> >>
>> >>
>> >> That's not true. it still follows the profiles, it just never turns
>> off
>> >> the elements due to the temperature in the chamber reaching the max.
>> >>
>> >> Ira
>> >>
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