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Heater with PID Control

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The original project was to cure powder coating for motor cores and stators, but the heater setup is the same as what is used for the filament extruder.

This project has evolved from many others. Project logs may not make sense, and the links to the side are for my reference. They are not necessarily the parts used in the toaster oven project.

  • 3 × MAX31855NASA+ Amplifier and Linear ICs / Instrumentation Amplifiers

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J. M. Hopkins wrote 03/05/2016 at 02:27 point

Gotcha. Well I wish the best, keep at it

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J. M. Hopkins wrote 03/05/2016 at 01:12 point

I'm curious, are you using two PID systems to accommodate the difference in cooling and heating rates?

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jlbrian7 wrote 03/05/2016 at 02:12 point

I honestly haven't gotten that far yet. What the
plan is right now is, using 3 n-type thermocouples, one below the galden
to measure the temp of the coils, one in or just above the galden to
measure the temp of the fluid at the elements, and one at the bottom of
the pcb for preheating, I want to run the cooling circuit at capacity,
and bring the heaters up to temp (this will be using pid), and just see
what that gets me inside the oven.  I will just have to go from there.

This project with the oven wasn't the reason for the original creation of
this post.  The first pid heater that I built was used for powder
coating motor cores, and it worked better than the previous circuit, but
the heating elements were exposed to the air conditioning in the room,
and I think the environment was too dynamic to get really good results
(the old heater is still around, I will post a pic at some point).
 

Ultimately, I am hoping to be able to find set flow rates for the cooling circuit,
and only worry about how much heat I am applying, but things are rarely
that easy.  Right now I don't have a clue if any of this is going to
work at all.

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