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Bleckers' Sunbeam BT2600 Controleo2 PCB Reflow Oven (Finished)

Discussion in 'Electronics & Electrics' started by bleckers, Mar 25, 2017.

  1. aXLe

    aXLe Member

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    Interesting on the quartz elements - I might upgrade mine. Let me know how you go when you receive them - whether its not too much drama to install them.
     
  2. MUDGEL

    MUDGEL Member

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    I Just finished all the disassembly of panels. Now to get out the old elements. That’s a bit tricky from what I’ve seen of how they’re installed. At the moment the only connected panels are the bottom , left side and back. Everything else has been disassembled to remove the old elements and prepare reinforcements and make larger openings and doubler plates for installing the new elements and convection fan. I think I might add an additional metal panel inside the rear of the oven as it’s just a single thin sheet. If I put insulation in the cavity that will greatly reduce any heat loss and radiant heat out the back.
    I think it’s worth doing all of this, it should be one rip snortin’ reflow oven when I’m finished, just like putting a kit together.
    Cheers
     
  3. aXLe

    aXLe Member

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    Sounds good. I wouldn't want to have to reinsulate my oven - I'd be wanting to remove the old elements without full disassembly. I'm keen to see how well the replacements fit.
     
  4. Benno1988

    Benno1988 Member

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    I had to google what a Reflow Oven was.

    From looking through the thread I thought you basically made a dope Pie/Sausage roll warmer. Guess you could use it to do that too...
     
  5. MUDGEL

    MUDGEL Member

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    Just got the elements in the mail. They’re 2.5 cm too long. My measuring error. What a bummer and I just finished removing the old ones. Should have left well enough alone and just did as Bleckers did and use the small additional element.

    Gonna have to rethink this now. Hmmm!
     
  6. MUDGEL

    MUDGEL Member

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    Hey aXLe, with the front panel you made, it seems you must have some specialised metal working tools to create the edge folds around the perimeter of the panel. Don’t suppose you’d make me one for a fee?
    Thanks,
    Mike V
     
  7. MUDGEL

    MUDGEL Member

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    Last edited: Oct 4, 2018
  8. Spoonman_au

    Spoonman_au Member

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    For anyone following this build, I have some results to share. My build uses the same sunbeam oven and a Controleo3 kit from Whizoo.

    With the original elements in the oven the learning test gets the following results:

    Power (level to sustain 120°): 10% (Good)
    Inertia (time to get to 120° from 150°): 69S (Bad)
    Insulation (time to drop back from 150° to 120°): 219S (Good)
    Score: 60% (Not that good)

    I decided to upgrade the elements to Quartz using the following:

    https://www.ebay.com.au/itm/391574144711

    For some reason the listing said only two available when I ordered the first couple, after I had ordered them the listing reappeared with another two available so ordered a second lot.

    After getting these installed I ran the test again and got the following results:

    Power: 9% (Good)
    Inertia: 29s (Good)
    Insulation: 144s (Good)
    Score: 98% (Excellent)

    The insulation results weren't as good because I assume the thermal lag of the original elements were affecting the original insulation test, but the results all round were much better.

    If anyone is considering building an oven, quartz elements make a big difference.
     
  9. Sammus187

    Sammus187 Member

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  10. aXLe

    aXLe Member

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    Cool - yeah the original elements suck - might do this upgrade on mine. How was the length for mounting those elements?
     
  11. Spoonman_au

    Spoonman_au Member

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    Ignore my crude silicone job, but the length is pretty good. The fat parts of the ceramic sit level with the side walls. I mounted them in by enlarging the hole so they could slide neatly into the oven from the side (so i didn't need to fully disassemble the oven) and then made plates that slide over the smaller part of the ceramic and screwed them into the walls. I then sealed with silicone on the inside which I probably should have done on the outside to make it neater.
     

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  12. Sammus187

    Sammus187 Member

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    Looks good - wish I'd gone this route. Mine is extremely heavily modified to get those chunk RS Online elements in there :) not sure why I went that route...
     
  13. aXLe

    aXLe Member

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    Awesome - yeah that seems like a pretty good option. Its the inertia of the factory elements that are the killer - they really mess with the PID algorithm. I find that the oven starts ramping up too quickly so the software kills the power to the elements, but seems to wait far too long to apply power again, and then it takes too long to get them ramping again. Good to know there are quartz elements that fit pretty well :)
     
  14. aXLe

    aXLe Member

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    They should give pretty even heat distribution - but a lot more work to install them (though the mounting looks pretty straight forward). I suspect your duty cycle will be well down - probably wouldnt need the boost element? Be very interesting to see your results.
     
  15. Andrew Smallridge

    Andrew Smallridge New Member

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    I know this thread is a while since this thread was last active but I thought it was worth sharing some information. I have a new BT2600 that I am about to start modifying and decided to see how it behaves before I start the modifications. The 4 heating elements appear to be resistive units.

    The label on the rear states it is rated at 1400watts at 240 volts. I put a K Type thermocouple in the unit and set the temperature to the “toast” setting. The temperature rose to 285 degrees celsius before I turned it off. Once I turned it off the temperature dropped slowly but not quickly enough despite opening the door about 2 to 3 cm. I was surprised both by the fact that it reach this temperature quickly without adding any insulation and that it took so long to cool down. Based on this quick test, I do not see any value in adding another heating element for my specific unit.​
     
  16. Spoonman_au

    Spoonman_au Member

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    See post #28, I had the original elements in there and it has no problem getting to and holding temperature (mine had insulation). The speed in which they get to temperature and the thermal mass of the elements is a problem. Off the top of my head, Controleo says that a score of under 80% for the self test is no good, I got 60% with the original elements and 98% with upgraded elements. However, if the heating profile of all your components and board can deal with the slower heat up and cool down times without damage, then no reason why you can't stick with them.
     
    Last edited: Jun 7, 2021
  17. SpecGen

    SpecGen Member

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    Resurrecting this thread again, but how did you wire your Quartz elements? They are listed as 220V so did you run extra wires back and wire them in parallel? Did you happen to measure the resistance of the elements before installing them?

    I also have a BT2600 and while it works to reflow, there's no way it's coming anywhere near a reflow curve (basically i just blast it for a while and then stop the power to let everything warm up, blast it again until I can see through the glass it's reflowing and then turn it off and crack the door to stop it from getting too hot). Consindering replacing the elements but judging how much work it's going to be first.
     

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