[Shop-talk] oven for powder coat

[Pat Horne]

1+ for double pole switch.  

Might want an indicator light across the heater to show that the heater is cycling. 

Make sure the wire you use in the heater & supply circuit is sized to support the required current. 

  Be sure to mount the ssr to a metal surface or heat sink & keep an eye on its temperature when you start the oven for the first time to be sure the heat dissipation is sufficient. 

Peace,
Pat

Pat Horne 
We support Caldwell County Habitat for Humanity


On Jun 28, 2018, at 6:59 AM, Donald H Locker <dhlocker at comcast.net> wrote:

I would recommend putting a double-pole switch with one pole in L1 and one in L2 so when the switch is off, both lines are disconnected from the bake element. (Current drawing has single pole switch in L1; nothing will blow up, but turning off the element power should disconnect both sides IMO.)

Everything else looks reasonable. Make sure the breakers upstream and the wires are sized for the load.

Donald.
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> On 27-Jun-2018 21:52, lee at automate-it.com wrote:
> 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
> diagram
> Quoting lee at automate-it.com <mailto: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 <http://a.co/hvTazTK>- 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 <mailto: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 <mailto: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
>>>> _______________________________________________
>>>> 
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