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Fix to prevent heat bed cutting out using relay switch

Discussion in 'Troubleshooting' started by Jerry RoBo 3D, Nov 23, 2013.

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  1. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    You could, but as Mike pointed out the connector for the bed heater is a potential failure point (if you removed it or replaced it with high current connectors then you are probably OK).
     
    #61 mark tomlinson, Feb 19, 2015
  2. Jerry RoBo 3D

    Jerry RoBo 3D Administrator
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    It is possible to increase the max temp setting in the firmware. If you have the latest version of the printer there is no connector in-between the heat bed and the ramps board so that is not a limitation in the system.
     
    #62 Jerry RoBo 3D, Feb 19, 2015
  3. Fart_Plume

    Fart_Plume Member

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    I'll be checking that this weekend, it's been really busy here this week. It does give me a good opportunity to teach my son some things about the arduino boards. ( I got him a starter kit for his 10th birthday, last month.)
     
    #63 Fart_Plume, Feb 19, 2015
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  4. Fart_Plume

    Fart_Plume Member

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    Thanks for the information. the firmware edit fixed the problem.
     
    #64 Fart_Plume, Feb 20, 2015
  5. Peter Krska

    Peter Krska Active Member

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    I just noticed a problem when my bed heats up, it starts to turn off and I can't get it to heat up again, unless I turn off my printer and restart.

    I start the printer - load a file - heats extruder and.bed fine. Starts the print and it's still heating. Somewhere along the timeline it started to cool the bed. Extruder working fine. I tried to manually turn on the bed but it does not climb stays around the 23 or less degrees.

    If I turn off the printer, reconnect, restart the print, the bed starts to heat up again.

    It's a recent issue. So I doubt it's a firmware issue. I already replaced my 3M heated pad underneath the glass bed.

    Do you think it's firmware? Any other suggestions?
     
    #65 Peter Krska, Feb 23, 2015
  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    what temp does it stall at? the new firmware clips it to 85 without modifications.
     
    #66 mark tomlinson, Feb 23, 2015
  7. Peter Krska

    Peter Krska Active Member

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    I'm using 55, climbs to that to then goes to around 23 or lower and won't heat again till the restart.

    I have a fan in my rod board. It's seams to be noisy but running.
     
    #67 Peter Krska, Feb 23, 2015
  8. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Hmmm, that sounds more like you might be hitting an issue with the RAMPS. If you have a spare, swap it in and try it.
    That MOSFET that drives the bed might be going south. Although the "won't heat again till the restart." sounds more like a software issue, but perhaps not.
     
    #68 mark tomlinson, Feb 23, 2015
  9. Peter Krska

    Peter Krska Active Member

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    Right now it's printing with steady bed temp of 55

    I also notice that it happens with longer prints, around 12 hrs or more. But you can never tell. I print everyday, the Robo3D printer is always running, and after making a few good prints, I notice the bed issue and I restart the printer getting back to printing. It's annoying not knowing if it will affect the print staying stuck to the bed especially large prints that take a long time to print and have a tendency to move the print off the bed of its not heated properly. ImageUploadedByTapatalk1424734705.124642.jpg
     
    #69 Peter Krska, Feb 23, 2015
  10. Marquis Johnson

    Marquis Johnson Active Member

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    When that started happening to me the connectors under the printer were burning up, they ended up burning out completely and instead of turning off mid print, the bed just wouldn't heat up at all. at the beggining of the video this is what I found.

    Hope that's not what happening to you
     
    #70 Marquis Johnson, Feb 23, 2015
  11. Julian Saldierna

    Julian Saldierna New Member

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    How well does this work?
     
    #71 Julian Saldierna, Mar 8, 2015
  12. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    You have the output from the ramps drive the relay switching and then run the bed power through the relay contacts.
     
    #72 mark tomlinson, Mar 8, 2015
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