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Temp control help on oven

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redheadfred
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Joined: Thu Apr 21, 2016 5:37 pm

Temp control help on oven

Postby redheadfred » Wed Sep 27, 2017 8:53 pm

I built a 4x4x6 oven , got pids and ssrs to control the heat . They work but once they get to set temp it starts heating up alot more and the ssrs get smoking hot .
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rdj357
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Re: Temp control help on oven

Postby rdj357 » Wed Sep 27, 2017 9:35 pm

You should use the SSR's for the control circuit of contactors (larger relays) as the SSR contacts are not rated for the current needed to operate most heating elements.
Robert Johnson
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7'x7'x10' DIY Powder Coat Oven

redheadfred
Posts: 67
Joined: Thu Apr 21, 2016 5:37 pm

Re: Temp control help on oven

Postby redheadfred » Wed Sep 27, 2017 9:45 pm

rdj357 , thanks for your reply . What kind of setup are you running ? Just been going what Ive been told that mine would work
Arclight 4x4
Hypertherm Pm45
Lincoln 256 Mig
Precision Tig 275
Baileigh 50 Ton Press
Quincy 2 stage 5Hp compressor

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WyoGreen
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Re: Temp control help on oven

Postby WyoGreen » Wed Sep 27, 2017 10:35 pm

I'm assuming that the SSR's you have are rated for the current you're putting thru them. You have to mount SSR's on pretty good sized heat sinks to dissipate the heat generated by them. If you have them heat sinked and they still are not opening the circuit to the heating coils, them perhaps they are not wired to the PID correctly. Make sure they are wired correctly, and if they are, try opening the SSR control circuit from the PID and see if they open the heating circuit.

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rdj357
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Re: Temp control help on oven

Postby rdj357 » Thu Sep 28, 2017 9:09 am

I have an SSR running the control circuit of a propane heater for my large oven and am in the process of building a smaller (4'x3'x8') oven that will be electric and will use the SSR to control an electric heat sequencer (24v control circuit that will bring my 3 strips on in stages). My background is 20 years as an HVAC contractor.
Robert Johnson
FourNinety Creations
-------------------------
PlasmaCam 5x10
Snap-n-Cut Mount
PM 65 w/ Mini Machine Torch
Router Attachment/DW611
VCarvePro & Photo VCarve
SpectraCoat Powder Coat System
7'x7'x10' DIY Powder Coat Oven

LakeCruiser
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Re: Temp control help on oven

Postby LakeCruiser » Mon Nov 13, 2017 10:53 pm

I use a seperate SSR for each of my elements and have not had a problem with any of my 4 SSRs or elements. Each SSR is mounted close to the element
pan (externally of course).
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