THERMAL RUNAWAY

Discussion in 'Calibration, Help, and Troubleshooting' started by Michael Frampton, Aug 24, 2016.

  1. Michael Frampton

    Michael Frampton Well-Known Member

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    BB 1.1 dual
    After having fitted new pt100 and got maching up and running..all great.then 10 mins into print THERMAL RUNAWAY, So i restart print and same again....have read about fan wire noise but this was never a problem with my old rumba before it failed...ideas pleaseeee
     
  2. Ephemeris

    Ephemeris Well-Known Member

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    The fans on the dual are very aggressive. Make sure the print cooling fans are as low as possible. It may also help to run the PID tuning routine again at your nominal print temperature.
     
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  3. Kanedias

    Kanedias Well-Known Member

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    I've had this happen and both times removing and reseating the heater fixed it.
     
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  4. Michael Frampton

    Michael Frampton Well-Known Member

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    How long did it last 1st time?
     
  5. Michael Frampton

    Michael Frampton Well-Known Member

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    I havent ever run Pid..dont know how to..any link to how would be interesting please
     
  6. Kanedias

    Kanedias Well-Known Member

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    once it started it kept happening at the same point every time I retried that print. I disabled the part cooling fan to eliminate that as the issue. Removing and reseating the heater was the last step before replacing it but thankfully it worked. My guess in my case is a bad connection but who knows.

    Pid tuning can be done from the control panel in simplify3d or octopi (I think, I don't use it) have a look on the Marlin wiki for the exact command. Or if you have RC6 firmware with the option enabled you can do it from the control panel.

    http://reprap.org/wiki/PID_Tuning
     
  7. Michael Frampton

    Michael Frampton Well-Known Member

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    Or a very good explanation; )
     
  8. Michael Frampton

    Michael Frampton Well-Known Member

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    Ive got a dual and both sides have given me this fault :(
     
  9. Kanedias

    Kanedias Well-Known Member

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    yeah unlikely both would be iffy. Try the PID thing and make sure your fan is coming on in stages.
     
  10. Michael Frampton

    Michael Frampton Well-Known Member

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    Il go turn it on now and look at available settings..ive heard some FW has auto PID tuning..mine aint :(
     
  11. Michael Frampton

    Michael Frampton Well-Known Member

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    My pids
    P +029.2
    I +004.73
    D +045.33
    C 100
     
  12. Michael Frampton

    Michael Frampton Well-Known Member

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    Just tried again..7 mins till fail
     
  13. Michael Frampton

    Michael Frampton Well-Known Member

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    Still going at 11 mins......would me having flow turned up over 150% have any effect? As its ramming cold filament into hot end?
     
  14. Michael Frampton

    Michael Frampton Well-Known Member

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    No fan by the way.thanks for that advice..17 mins now !!!
     
  15. Kanedias

    Kanedias Well-Known Member

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    I'm sure you're watching it like a hawk; is your extruder temp oscillating much? Ideally it shouldn't swing by more than a degree either way. If it's constantly swinging by more that might mean your PID settings aren't right.
     
  16. Michael Frampton

    Michael Frampton Well-Known Member

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    I am hawklike.lol..set at 240c running at 237-238c and just once at 236c
     
  17. Michael Frampton

    Michael Frampton Well-Known Member

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    Now running 240/240 15 mins in ..excited !!
     
  18. Michael Frampton

    Michael Frampton Well-Known Member

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    Running 235-242 now :/ 1hr 3 mins
     
  19. Jean VISCONTE

    Jean VISCONTE Member

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    Had the same.
    Ended up with PID parameters more agressive (P=40 I=25 ...) and it works like a charm since.

    THERMAL RUNAWAY is another story: I have a BB dual with thermistors, and thermistors are connected through 2 pin plug.
    There was a false contact on one of those on the head, as a result measurement was erratic. Solution: contact cleaning bomb, and repeat this each week when you start up the BB. Investigating for finding gold plated contacts. Possible pollution with plastic fumes?
     
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  20. Michael Frampton

    Michael Frampton Well-Known Member

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    Many thanks Jean
     

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