Heater fault. replacement of PT100 and heater cartrudge did not help



  • Hi!

    i have the issue with (i think) smart effector.

    to troubleshoot i did following
    1. replaced heater cartridge and PT100 - did not work
    2. have plugged heater cartridge directly into duetWiFi board and it heats well (almost burned my fingers :)).
    3. used multimeter and tested power line from board to both pins on Smart Effector (that are visible on the other side, next to "D4" mark on the board) - both are OK
    4. used same tool and found that there is no link from one of the "other side" pins end and green connector.

    on the pic below green connection works, red does not. should it?
    if not - where to look / measure / fix
    if yes - can i just solder in piece of cable?

    thanks!


  • administrators

    Yes there should be continuity where you show the red connection. That trace is on the other side of the PCB. You should be able to see the end where is it soldered to the terminal block, but the other end will disappear underneath the 6-pin connector. If you see any damage to that trace, please post a photo.

    I suggest you check that the terminal block connection looks properly soldered, and if it does, use a piece of wire to bypass the trace.

    What was the power rating of the heater? If you are using a 24V supply, was it definitely a 24V cartridge?



  • well, track burned out… heater is 12v and power is 12v too. will solder track and update.
    pictures are here. will keep it for some time https://1drv.ms/u/s!AhtLyZEPcjv9gc9IHxJL58dL2BxL3w


  • administrators

    As you say, it's well and truly burned out. I don't believe we've had any other reports of that happening. What is the resistance of the heater cartridge?



  • it shows 3.6 Ohm… i also found that wire next to cartridge "entrance" was naked. probably i touched it for a moment and that was sufficient for track to burn. i'm very happy that board is alive!
    now i have put some capton tape around and it should be fine.

    by the way, is there any protection from short circuit?


  • administrators

    The Smart Effector is not protected against short circuit. The latest Duets have a fuse in the VIN supply to the fans, however it won't necessarily stop the fan mosfet from blowing if you get a short in a fan circuit.

    The power supplies used in 3D printers are invariably short circuit protected, however that doesn't stop then supplying enough current to burn out PCB traces.



  • @dc42 said in Heater fault. replacement of PT100 and heater cartrudge did not help:

    The Smart Effector is not protected against short circuit. The latest Duets have a fuse in the VIN supply to the fans, however it won't necessarily stop the fan mosfet from blowing if you get a short in a fan circuit.

    now i have upgraded power supply to 24v-14amps mean-well. fans and heating cartridge were upgraded by 24v version too.
    after that i successfully run M303 H1 P1 S200 and stored results by M500.

    it still gives me heater fault in the middle of the print.

    I run 2.0(RTOS)RC2b (2018-05-13b3)
    (in fact firmware upgrade to rtos did not help either

    for the test i also connected heating element directly to the board, bypassing smarteffector .

    what parameters i can measure on the board to find faulty element. can it be clock or mosfet failure ???



  • Hi, in the photo I noticed that I see metal washers under the lock nuts. Should be nylon washers to prevent damage to the traces and possible shorts.


  • administrators

    @quadcells said in Heater fault. replacement of PT100 and heater cartrudge did not help:

    Hi, in the photo I noticed that I see metal washers under the lock nuts. Should be nylon washers to prevent damage to the traces and possible shorts.

    There are clear areas around the 6 mounting holes for the ball studs so normal size metal washers are OK there. If the 3 additional mounting holes are used for any purpose, then nylon washers are needed at those locations.



  • @dc42 please let me know what i can measure on the board to fix it... i do not feel it is right to buy a new one without fixing attempts???
    can i send you board for repair???

    thanks!


  • administrators

    @c310 said in Heater fault. replacement of PT100 and heater cartrudge did not help:

    @dc42 please let me know what i can measure on the board to fix it... i do not feel it is right to buy a new one without fixing attempts???
    can i send you board for repair???

    thanks!

    I've lost track: what is it that you need to fix?



  • @dc42, sorry, thanks for the clarification.



  • @dc42 said in Heater fault. replacement of PT100 and heater cartrudge did not help:

    I've lost track: what is it that you need to fix?

    well, i'm trying to resolve heater fault issue. i was changing components one by one, but it did not help.

    as of now i have upgraded PSU to meanwell 24v 14a, replaced fans and heater cartridge to 24v , new PT-100
    basically everything is new and 24v (was 12v). new heating element was successfully calibrated via M303

    I run 2.0(RTOS)RC2b (2018-05-13b3)
    (in fact firmware upgrade to rtos did not help either)

    system still produces heater fault error (temperature was rising slowly than 0.3 deg per sec )

    from the side it looks like heating element lost power (at some point temperature start falling down very slowly and )

    question: what i can measure on the board to fix it... i do not feel it is right to buy a new one without fixing attempts???
    can i send you board for repair???

    many thanks in advance !



  • @c310 You mentioned "from the side it looks like heating element lost power" If you see the heater LED on the smart effector go out it likely points to a bad crimp on the smart effector cable connection. Wiggle the cable the next time you see this, or simply redo the crimp connection.



  • @ayudtee said in Heater fault. replacement of PT100 and heater cartrudge did not help:

    ooks like heating element lost power"

    to avoid such a situation i wired heater directly to the board..


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