Problems with thermocouple on Ultimaker with E3D-v5

Discussion in 'E3D-v6 and Lite6' started by lucalab, Mar 27, 2014.

  1. lucalab

    lucalab Member

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    Hello,


    this is my first post to this forum. I hope someone is able to help me. I'm encountering the following problem with my newly arrived E3D v5 print head.
    I can set it to whatever degrees I want within the acceptable range of my Ultimaker. The temperature readings on the display of the ulticontroller seem to be accurate enough. Let's say I heat up till 220 degrees, which goes fairly quick until it hits 218 degrees. The last 2 degrees may take a little longer. Then the real problem occurs: once I hit the print button the temperature readings suddenly drops with about 80 - 100 degrees and it keeps going up and down while printing. I'm just in testing stage, so there's not yet any filament involved in this. It's just so strange that temperature readings go up and down with that giant leaps in no time. Not sure what to do next. Oh, by the way, I'm using a welded type k thermocouple bought from E3D on the provided thermocouple pcb from my ultimaker. Any suggestions?

    Thanks.

    Chris
     
  2. lukan

    lukan Member

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    Can you link a picture of the temperature differentials?

    It seems that any of the J/K type thermocouples have a delay in their responses so some wavering around the set temp should be expected. But from what you are stating it sounds more drastic that +/- 5 to 10 °C.

    I would put some filament into the Hotend and see if that doesn't stabilize the temperature swings. If the swings are still happening, do you have a thermistor that you could swap out with and see if the same thing is happening with it?
     
  3. Frans48

    Frans48 New Member

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    I am having troubles too. But they are not identical.
    You write about a thermocouple; The OEM temperature sensor is a 100k Semitec 100kOhm NTC Thermistor. (104GT-2) not a thermocouple.
    The Ultimaker heater cartridge is a 18V 40 W with a lenght of about 32 mm; the E3D cartridge is 12 V 40W with a length of about 19 mm.

    I changed the Marlin firmware for the thermistor (with 4,7k pullup). Heating is very fast, but it doesn't stop!
    I am not sure if the E3D cartridge can have the 18V or will be ruined.. :oops:
    I found a remark obout the PID settings, but I don't know how to go on.

    I probably will reinstall the UM thermocouple, nozzle and heater cartridge.
     
  4. lucalab

    lucalab Member

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    Hello,


    I bought the type K thermocouple with the e3d hotend. Last week I took everything apart again to see whether something wasn't well connected. I tried the original thermocouple from the ultimaker. That worked out fine. Then I changed again with the recently bought type K and glued it in the hole of the e3d heater block with some hotglue to conduct the heat better.
    That seems to have done the trick because I've been printing for some days without any major porblems. I'm trying know to print a custom printhead for my ultimaker to be able to use the entire Z-axis again. Now with the adjusted original head from the ultimaker, the e3d is quite a lot longer so I only am able to use about 160mm in Z direction.
    The only thing I don't know is what type of thermocouple to use in Ginge's Marlinbuilder (I'm now using the original setting of the ad595 in the firmware, but I don't know whether this is correct). Perhaps Sanjay can point me out to what kind of thermocouple it is they are selling.
     
  5. flugels

    flugels Member

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    HELP! :cry: :cry: :cry:
    Problems with thermocouple on Ultimaker with E3D-v5

    I just got my v5 and if i run Pronterface if the nozzel is at room temputere it says its 75.
    I tried different kind of marlin whit different settings but still i keeps reading temps above room temp.

    I really want to print again any 1 may know what the heck is going on ? ore how to fix it ?
     
  6. Josh

    Josh Administrator
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    Hi Fugels,

    Can you give us any more info on your setup? How is it attached to your HotEnd? Are you able to independently verify the measurement using a voltmeter?
     
  7. flugels

    flugels Member

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    Hello,

    I have ultimaker original, whit the standart Thermocouple https://www.ultimaker.com/products/ther ... ransmitter
    Thermocouple (AD595)
    I bought the E3D bowden hot end V5, did everything according the Documentation.

    So i hook t up my printer, and i saw the readings from the temp and it said 75, so i felt it and it is cold.

    this is where i got my firmware
    http://marlinbuilder.robotfuzz.com/

    :cry: i still cant print i tried them all but all of them dont work :(
     
  8. Josh

    Josh Administrator
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    It sounds like there is a problem somewhere between the thermistor and the thermocouple amplifier ("transmitter"), or maybe a fault with the transmitter itself.

    Have you extended the thermocouple anywhere? It is important to note that extending thermocouple cables will cause inaccurate readings - as you are essentially creating more thermocouples.

    Can you test the temperature of the thermocouple with a voltmeter? It is a standard Type K. If this measures correctly, then you will want to measure the output of the transmitter and confirm that it is sane..

    Keep us posted!
     

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