Heated Bed Max Temp

Discussion in 'Calibration, Help, and Troubleshooting' started by Chase.Wichert, Mar 4, 2016.

  1. Chase.Wichert

    Chase.Wichert Well-Known Member

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    okay, so now that the hotends are functional, is anyone having trouble getting there bed to heat up past 95? Mine never goes passed that..
     
  2. Chase.Wichert

    Chase.Wichert Well-Known Member

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    Okay his is how I fixed the heated bed not being able to heat over 95, just a large layer of paper towels under the bed.
    [​IMG]

    [​IMG]
     
  3. theTroll527

    theTroll527 Well-Known Member

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    Sounds like there is a current problem. Doesn't seem like you have enough wattage coming out of the Power Supply.
     
  4. Chase.Wichert

    Chase.Wichert Well-Known Member

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    I dunno just seems like it's too cold in my house and can't quite get hat extra few degrees... Its18C, or 65 degrees..
     
  5. Mike Kelly

    Mike Kelly Volunteer

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    I was heating my bed to 120C no problem in a 10C room.


    Do you have the heatsink connected to it ;)

    Go ahead and measure the resistance of the heater and the thermistor for the bed. Then the voltage output like we did before.

    then see if maybe the cork is drooping in the middle, or maybe the thermistor came a little loose by pressing in the middle
     
  6. Chase.Wichert

    Chase.Wichert Well-Known Member

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    HAHAHAHAhahahaha....... Lol I'll check it, the cork isn't drooping, it secure. I'll post what I find out.
     
  7. Chase.Wichert

    Chase.Wichert Well-Known Member

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    75Kohms at 32C and the bed was 0.6ohms.. I think...
     
  8. Chase.Wichert

    Chase.Wichert Well-Known Member

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    It's only pulling 2.5 amps at 24 volt...
     
  9. Mike Kelly

    Mike Kelly Volunteer

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    Check both the connectors. 0.6ohms doesn't make sense for the resistance.

    Should be like 2.88ohms
     
  10. Chase.Wichert

    Chase.Wichert Well-Known Member

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    Hmm i've checked all three, Will do again
    8.9 ohms at 51C approx (This time I pulled of the cover and measured where it plugs into the board, disconnected the wires first, Last time I unplugged the bed and tried to measure the plug connectors. and .6ohms is what my multimeter internal is lol)
    34.9kohms for thermistor
     
    #10 Chase.Wichert, Mar 5, 2016
    Last edited: Mar 5, 2016
  11. Chase.Wichert

    Chase.Wichert Well-Known Member

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    Oh this is also interesting, I checked the actual bed temp with my FLIR, and at 95C bigbox reading, the top of the bed was only 65C, and it had been on for like 2 hours
     
  12. Mike Kelly

    Mike Kelly Volunteer

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    Take the glass off if you're going to try that. Let it cool down and measure the resistance. Keep the bed plugged in, and measure from the Bed Out on the rumba

    I just verified on mine it's around 2.7ohms Something is not properly plugged in somewhere, maybe a wire is loose, but you should be seeing exactly the same thing
     
    #12 Mike Kelly, Mar 5, 2016
    Last edited: Mar 5, 2016
  13. Chase.Wichert

    Chase.Wichert Well-Known Member

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    I also put a thermocouple on it...
     
  14. Chase.Wichert

    Chase.Wichert Well-Known Member

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    Okay, so earlier when i was getting .6ohms when measuring the connector on the heated bed, I was doing red to red, dumb. I am still getting 8.6ohms directly on the connector, for both pairs, so it isn't the wire...
     
  15. Chase.Wichert

    Chase.Wichert Well-Known Member

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    The heated bed is the only thing holding me back right now, after that it is done.
     
  16. Mike Kelly

    Mike Kelly Volunteer

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    Keep poking at wires until you read 2.8ohms at the input terminals. 100% it's a wiring issue.
     
  17. Chase.Wichert

    Chase.Wichert Well-Known Member

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    So the wires themselves read 2.8 ohms, the bed is 1.7, and the bed and wires together are 9.6
     
  18. Chase.Wichert

    Chase.Wichert Well-Known Member

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    Mike would you be up for another hangout?
     
  19. Chase.Wichert

    Chase.Wichert Well-Known Member

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    I took out the mechanical splice on the wires, where it splits off into two wires for the bed connector and soldered them together, and now each leg is at .9ohms, still doesn't heat up
     
  20. Mike Kelly

    Mike Kelly Volunteer

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    Ok I'm a little concerned with what you're doing. Please post a picture of where you're taking these measurements.

    I can't really commit to anything since I'm in the middle of selling my house
     

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