Sources of heater faults?

  • I have a kapton heater (bed) and a 30W cartridge each controlled a thermistor and a PT1000 respectively on an older duet wifi.

    I have had each of them have a failure at least once. Today the bed seemed to have a fault in the speed of the rise in temperature but after clearing the fault it eventually got up to its set point just fine.

    The hot end I have also had at least one failure maybe another. I cannot remember the exact number.

    So far both have generally worked to heat up. Is there anything I should be looking at which might cause these issues?

    Both are 12V, the kapton is about five years old and the heater cartridge is from e3d but isn’t new - but not heavily used either. The pt1000 came from precision piezo and is connected to a smart effector.

  • Have you run a heater tune lately?

  • Also check your power supply. When you get a heater fault, look at Vin either on DWC or by running M122.

  • @jens55 Not recently, I can do that.

  • @deckingman This is the sort of off the side thought I could use, I will look at this next time thanks!

  • @deckingman @jens55 An update: I just started a tuning of the bed and the voltage drop was potentially significant - 11.2 V instead of closer to 12V. Original was 12.2V.

    This bed is a 170mm round.

  • I just installed my old meanwell power supply instead of the knockoff that came with this thing. The drop went down to 11.4 but stablized at 11.5. Normal again was at 12.2V.

  • @zzing It sounds like the PSU might be a bit marginal although 11.5V should be OK. Can you crank the voltage up on the Meanwell? It might help. But be sure to run heater tuning again if you do.

  • @zzing said in Sources of heater faults?:

    my old meanwell power supply

    what is the rated power of that supply?

  • @Veti 29A

  • @deckingman I just adjusted it so that it is around 13V. I will run the heater tuning again.

  • Assuming your bed heater isn't drawing excessive power and that you measured power supply voltage right at the power supply and not somewhere down the wire, you have a supply that is about to give out or a clone supply. Note that you can not tell a real MeanWell power supply from a clone unless you know what you are looking for or open it up. May I suggest you plan for a new power supply in the near future? You might see a 0.1 or maybe even 0.2V drop but most certainly not a 1.0 volt drop.
    I do not believe that adjusting the output voltage will make any difference if your voltage swings all over the place.
    This may not be the only issue but is certainly an issue in itself.

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