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    Burnt out heat bed?

    Scheduled Pinned Locked Moved
    Duet Hardware and wiring
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    • Phaedruxundefined
      Phaedrux Moderator
      last edited by

      Were you using crimped ferrules on the bed wires?

      You may be able to replace the terminal if no other damage has been done to the board or surrounding components.

      https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers#Section_Screw_Terminals

      It is recommended to use bootlace ferrules for power and bed wiring. Loose wires, or tinned wires, have a tendency to creep over time and cause a loose connection. This in turn increases the resistance and heat generation and even arcing.

      https://duet3d.dozuki.com/Wiki/Choosing_a_bed_heater?revisionid=HEAD#Section_Low_voltage_bed_heater_driven_directly_from_the_Duet

      Z-Bot CoreXY Build | Thingiverse Profile

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      • AlexTheGreatundefined
        AlexTheGreat
        last edited by

        I was using the bootlace ferrules. That's why I don't understand how it happened? Shouldn't the fuse have blown first?

        danym21undefined 1 Reply Last reply Reply Quote 0
        • Phaedruxundefined
          Phaedrux Moderator
          last edited by

          That looks like tinned wires to me?

          The fuse holder is empty. I assume you've removed it to check it?

          Z-Bot CoreXY Build | Thingiverse Profile

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          • danym21undefined
            danym21 @AlexTheGreat
            last edited by

            @AlexTheGreat
            under the board the blue cable is this damaged?
            and it looks like it was also burned under the board.
            So maybe a short with the damaged cable under the board?

            AlexTheGreatundefined 1 Reply Last reply Reply Quote 0
            • AlexTheGreatundefined
              AlexTheGreat @Phaedrux
              last edited by

              @Phaedrux It's whatever wires the ender 3 uses aha

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              • AlexTheGreatundefined
                AlexTheGreat @danym21
                last edited by

                @danym21 No. I pulled out a new bed and hooked it up and it seems to be working alright still. No idea what caused it to happen though.

                danym21undefined 1 Reply Last reply Reply Quote 0
                • danym21undefined
                  danym21 @AlexTheGreat
                  last edited by danym21

                  @AlexTheGreat
                  so all working again?
                  is this your heatbed cables?: e8caf3c2-e16c-4686-b67e-c70e1c32d97d-grafik.png
                  please use crimped cables and not tinned wires.
                  tinned cables become soft and then you lose pressure on the connection, this will heat the connection regarding the higher resistor under load
                  please cut the tinned part of and use crimped connection like this cable:
                  2c0db132-ed00-47d3-847f-927a66d39dd5-grafik.png

                  AlexTheGreatundefined 1 Reply Last reply Reply Quote 0
                  • AlexTheGreatundefined
                    AlexTheGreat @danym21
                    last edited by

                    @danym21 Yeah that's the new ones before I crimped them and put them in. Everything seems to be working again for the time being. Would be nice to know what caused it though.

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                    • Phaedruxundefined
                      Phaedrux Moderator
                      last edited by

                      You can't crimp tinned wires.

                      Z-Bot CoreXY Build | Thingiverse Profile

                      AlexTheGreatundefined 1 Reply Last reply Reply Quote 1
                      • AlexTheGreatundefined
                        AlexTheGreat @Phaedrux
                        last edited by AlexTheGreat

                        @Phaedrux I mean you can. It's just not good practice. But I did cut and crimp them, didn't crimp over the tin.

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                        • zaptaundefined
                          zapta
                          last edited by zapta

                          FYI, If you want to avoid high currents on the duet board or it's green terminals, you can use an external DC SSR or power MOSFET.

                          You can find some information here https://duet3d.dozuki.com/Wiki/Choosing_a_bed_heater

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