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heater cartridge wiring gauge

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Duet Hardware and wiring
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  • undefined
    gnydick
    last edited by 3 Dec 2024, 01:04

    looking at the docs for the toolboard 1LC, it says the heater can sustain up to 5A. Figuring 24V and 5A would yield 120w. I want to hook up an 80w heater I have but the wire guage is much too large. What am I missing here?

    undefined 1 Reply Last reply 3 Dec 2024, 08:20 Reply Quote 0
    • undefined
      gloomyandy @gnydick
      last edited by 3 Dec 2024, 08:20

      @gnydick What heater are you using? If it has a particularly heavy set of wires attached to it I'd be checking that it is actually 24V 80W and not 12V 80W. Other than that I'm not really sure what question you are asking. It may be that the heater designers are expecting a long cable run and so have chosen a heavier gauge of wire, but that is probably a question for them.

      undefined 1 Reply Last reply 3 Dec 2024, 09:16 Reply Quote 0
      • undefined
        gnydick @gloomyandy
        last edited by gnydick 12 Mar 2024, 09:17 3 Dec 2024, 09:16

        @gloomyandy it's the 80w heater that can be ordered from Luke's Lab for the Chube hot end. I'm running the air cooled so it uses the 6x20 cartridge, not the super volcano length.

        What I'm asking is, is that normal? If it's that large for 80w, how could a 120w ever fit, etc.

        undefined 1 Reply Last reply 3 Dec 2024, 10:45 Reply Quote 0
        • undefined
          droftarts administrators @gnydick
          last edited by droftarts 12 Mar 2024, 10:53 3 Dec 2024, 10:45

          @gnydick What gauge is the wire? Is it too big for the ferrules, or too big for the screw terminals of OUT0? In https://docs.duet3d.com/Duet3D_hardware/Duet_3_family/Duet_3_Toolboard_1LC#wiring-notes we say

          Screw terminals: These are not high current so fitting the wires directly into the screw terminals is fine. Using small ferrules is also fine; Duet3D supply 0.5mm^2 white ferrules.

          EDIT: Is it these? https://lukeslabonline.com/collections/general-3d-printer-parts/products/high-wattage-heater
          They say 18 gauge wire, which is 1mm diameter or 0.823mm^2. So won't fit in the supplied ferrule, but should easily fit in the screw terminal, even with a larger ferrule.

          Ian

          Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

          undefined 1 Reply Last reply 3 Dec 2024, 20:31 Reply Quote 0
          • undefined
            gnydick @droftarts
            last edited by 3 Dec 2024, 20:31

            @droftarts, yes, exactly. I couldn't even get the strands in a ferrule that would fit.

            Originally, I tried just reducing the conductor count but that caused the wires to get hot to the touch and the toolboard's mcu was over 100deg C.

            So I ended up making a step-down connector that reduces the diameter. basically additional high temp heater cord spliced in and fit in the ferrule.

            It's working better now. The MCU is only 64 deg and nothing is hot to the touch.

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