• Tags
  • Documentation
  • Order
  • Register
  • Login
Duet3D Logo Duet3D
  • Tags
  • Documentation
  • Order
  • Register
  • Login

Burnt out heat bed?

Scheduled Pinned Locked Moved
Duet Hardware and wiring
4
12
407
Loading More Posts
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • undefined
    Phaedrux Moderator
    last edited by 11 May 2020, 20:52

    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

    1 Reply Last reply Reply Quote 0
    • undefined
      AlexTheGreat
      last edited by 11 May 2020, 22:34

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

      undefined 1 Reply Last reply 11 May 2020, 22:41 Reply Quote 0
      • undefined
        Phaedrux Moderator
        last edited by 11 May 2020, 22:38

        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

        undefined 1 Reply Last reply 11 May 2020, 23:01 Reply Quote 0
        • undefined
          danym21 @AlexTheGreat
          last edited by 11 May 2020, 22:41

          @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?

          undefined 1 Reply Last reply 11 May 2020, 23:03 Reply Quote 0
          • undefined
            AlexTheGreat @Phaedrux
            last edited by 11 May 2020, 23:01

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

            1 Reply Last reply Reply Quote 0
            • undefined
              AlexTheGreat @danym21
              last edited by 11 May 2020, 23:03

              @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.

              undefined 1 Reply Last reply 11 May 2020, 23:13 Reply Quote 0
              • undefined
                danym21 @AlexTheGreat
                last edited by danym21 5 Nov 2020, 23:14 11 May 2020, 23:13

                @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

                undefined 1 Reply Last reply 12 May 2020, 00:19 Reply Quote 0
                • undefined
                  AlexTheGreat @danym21
                  last edited by 12 May 2020, 00:19

                  @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.

                  1 Reply Last reply Reply Quote 0
                  • undefined
                    Phaedrux Moderator
                    last edited by 12 May 2020, 02:32

                    You can't crimp tinned wires.

                    Z-Bot CoreXY Build | Thingiverse Profile

                    undefined 1 Reply Last reply 12 May 2020, 04:54 Reply Quote 1
                    • undefined
                      AlexTheGreat @Phaedrux
                      last edited by AlexTheGreat 5 Dec 2020, 04:54 12 May 2020, 04:54

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

                      1 Reply Last reply Reply Quote 0
                      • undefined
                        zapta
                        last edited by zapta 5 Dec 2020, 05:36 12 May 2020, 05:36

                        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

                        1 Reply Last reply Reply Quote 0
                        11 out of 12
                        • First post
                          11/12
                          Last post
                        Unless otherwise noted, all forum content is licensed under CC-BY-SA