[Shop-talk] oven for powder coat

[lee at automate-it.com]

  Another question before I blow up a circuit, etc. I've drawn my  
proposed wiring for the oven w/ PID controller, shown below. Have I  
done anything seriously stupid here? The oven's not put back together  
yet, but I tested the fan and the lights with 110V, all works as  
expected.

The "fan" is just the one that clears the space between the oven and  
the top panel. I want to be able to have the fan and/or oven light on  
without having the main power on. The chassis ground etc. is present,  
but not shown in my drawing. 

Any suggestions appreciated.
- Lee

Quoting lee at automate-it.com:

> I decided to go with the PID controller - publicly because it's  
> "more accurate", but honestly, because it's a lot more fun to play  
> with! I went with this version - http://a.co/hvTazTK [1]- with the  
> 40 A relay.
>
> So I couldn't resist checking it out when it arrived - I just set up  
> a quickie "easy-bake oven" set to 120 deg F, with a light bulb and a  
> plastic container. It works great. See linked photo below. Note the  
> "almost" glowing lamp - it's approaching the set temperature, and I  
> caught it just as the power was switching. 
>
>   Several projects to clear up before I get the actual oven set up  
> in the shop, but this will just be fun.
>
> Thanks for the thoughts,
>  Lee
>
> Quoting Lee Daniels <lee at automate-it.com>:
>
>> Wow, that's incredible. I was thinking of something insanely  
>> simple, like this:
>> https://ebay.to/2MCpgtw
>>
>> but for even less $$ I can get a digital PID controller? That's crazy.
>> Someone who knows more than I do about these: Does the simple  
>> thermostat above
>> just switch (on/off) the connection to the two prongs on the back?
>>
>> The nice one below obvious includes derivative control to avoid overshoot.
>> More tech than I really needed, but man I had no idea these were affordable.
>>
>> Thanks
>> Lee
>>
>> On Sun, June 17, 2018 18:16, Pat Horne wrote:
>>
>>> Might this work? Haven't studied it.
>>> https://ebay.to/2HWvjWB
>>>
>>> Peace,
>>> Pat
>>>
>>> Pat Horne
>>> We support Caldwell County Habitat for Humanity
>>>
>>> On Jun 17, 2018, at 5:46 PM, Lee Daniels <lee at automate-it.com> wrote:
>>>
>>> I've got a line on a free Whirlpool model RBS305PDQ4 oven. The electronic
>>> panel on the front doesn't work (turns on, but intermittent control of the
>>> touch controls). I searched the usual repair parts places, and the  
>>> consistent
>>> answer is "this part is no longer produced, unavailable - buy a new oven".
>>>
>>> As this is for powder-coating, all I really want to do is heat it up to 350
>>> deg. Can I hot-wire this with a on-off switch and some kind of basic
>>> thermostat? Any ideas? thanks Lee
>>> _______________________________________________



Links:
------
[1] http://a.co/hvTazTK
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