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Help!!!! With Wiring Kiln

Discussion in 'Forges, Ovens, Kilns, & Salt Pots' started by derickm, Mar 4, 2014.

  1. derickm

    derickm New Member

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    Hey everyone, I have been working on build a 110V 18A Kiln and I have come across a roadblock in the wiring. My problem is when I turn the power on in my panel box my tester (light bulb) is coming on before the relay is turned on from the PID.

    http://www.amazon.ca/gp/product/B005NGL4KG/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

    http://www.ebay.ca/itm/Solid-State-...LH_DefaultDomain_0&hash=item1c31d113f0&_uhb=1

    Any help is greatly appreciated, I dont know if I am missing something obvious or what my problem is.

    Thanks

    [​IMG] [​IMG]
     
  2. dancom

    dancom Dust Maker Best Shop Tool

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    Circuit diagram looks okay. Lot of assumptions to make here.

    The LED on the DC side of the SSR is off, indicating it is not supposed to be firing. What is the size (watts) of the load (light bulb)? If the SSR has a snubber circuit you may see a small current leakage which would make it appear to be on at the output. Enough to fool your meter or turn a test lamp on. Try an incandescent light bulb for a test load.

    I'll await your reply.

    Good luck!

    Dan
     
  3. derickm

    derickm New Member

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    Thanks Dan, I will try after work today and re-post.
     
  4. derickm

    derickm New Member

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    Dan it is a 40 watt incandescent light bulb.
     
  5. dancom

    dancom Dust Maker Best Shop Tool

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    OK good. 40 W won't light up with leakage. Is the LED on the SSR on or off when the lamp is on? Does the LED go on and off then you toggle the switch in the DC side?

    Dan
     
  6. derickm

    derickm New Member

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    LED on SSR is off when the lamp is on. And yes the LED goes on and off when I toggle it.
     
  7. dancom

    dancom Dust Maker Best Shop Tool

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  8. derickm

    derickm New Member

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    Thanks Dan for your help! I was guessing the SSR was bad, but I just wanted to be sure. I guess I will have to wait on the test run and get a better SSR.
     
  9. dancom

    dancom Dust Maker Best Shop Tool

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    Wouldn't be the first time one of these things arrived DOA. I recall reading several accounts in knifemaking forums where kiln/oven/furnace builders have encountered bad SSRs.

    You may still be able to test run your oven. On mine, the SSR is on steady until we get close to target. So for stainless steel the first 980 degrees C it's on continuous. It only starts pulsing as the PV gets close to target (SV). That's the beauty of PID. On mine, I can turn the elements off and leave the PID controller on. That way I can monitor the temperature when the elements are off. Surprisingly it takes a very long time to get back to room temp. Could be useful for annealing.

    Let us know how it goes and take some pics. We love to see what creative minds are up to!

    Good luck!

    Dan
     
  10. dancom

    dancom Dust Maker Best Shop Tool

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    You got it working? Have you did a heat run yet?

    Dan
     
  11. derickm

    derickm New Member

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    Yes I did get it going I parted with some extra cash and bought a crydom solid state relay. And yes I did try it out on some 440c without foil (because I didn't have any) and it took just under to hours to get to 1040 Celsius. I hope to finish it up and get some pictures posted within the next few days. The chamber dimensions are 22" long, 7" wide and 7" high. And to control it I'm using a Mypin Ta4 but I don't like how it cycles at lower temps right now so I need to figure that out still.
     
  12. dancom

    dancom Dust Maker Best Shop Tool

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    Happy to hear that it's working now.

    I found a few issues worth mentioning. My door changes shape at about 850°C and leaks a bit, thus slowing my time to target temp. While the neodymium magnet to hold the door closed seemed like a good idea, I use a vise-grip now. I also found that I had to set my controller higher than my target, say to 1090°C or the PID controller would kick out and in early and start the slow temp rise too early and take an extra hour before it got to temp.

    These are all little and the overall result is we can do heat treating of stainless at home.

    [​IMG]

    Dan
     

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