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Duet Wifi fans not working

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  • undefined
    3DRikat
    last edited by 1 Dec 2018, 13:57

    Hi,
    I wired my new DuetWifi to my Anycubic Kossel Linear Plus and the fans aren't working. I found this thread: https://forum.duet3d.com/topic/4190/fans-not-working and I'm pretty sure I have the same problem. Since I'm new to this, I don't know exactly how to use the multimeter and how to fix this problem.

    Could someone please give me a step-by-step instruction on this exact problem?

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    • undefined
      dc42 administrators
      last edited by 2 Dec 2018, 23:32

      If none of the fan outputs is working (even the always-on outputs):

      • Check that you have a jumper on the V_FAN jumper block, to connect the centre pin either to the VIN pin or to the 5V pin
      • If your Duet is revision 1.03 or later, check the 1A blade fuse

      Duet WiFi hardware designer and firmware engineer
      Please do not ask me for Duet support via PM or email, use the forum
      http://www.escher3d.com, https://miscsolutions.wordpress.com

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      • undefined
        3DRikat
        last edited by 3DRikat 12 May 2018, 19:30 5 Dec 2018, 19:28

        Thanks for you answer. None of the outputs is working (including the always-on outputs). The jumper is on the V_FAN jumper block and connects to the VIN pin. I checked the 1A blade fuse and it's working. I have the latest Duet version.

        Is there something else I can do?

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        • undefined
          dc42 administrators
          last edited by 5 Dec 2018, 19:35

          Concentrate on getting the always-on outputs working. First of all, do you have the fan red (+) and black (-) wires connected the right way round? Are you sure that the fan works?

          Duet WiFi hardware designer and firmware engineer
          Please do not ask me for Duet support via PM or email, use the forum
          http://www.escher3d.com, https://miscsolutions.wordpress.com

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          • undefined
            3DRikat
            last edited by 10 Dec 2018, 19:26

            When I started I connected it the wrong way, now it’s correctly connected. Could it be that something is broken with the fuse still in tact?

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            • undefined
              dc42 administrators
              last edited by 10 Dec 2018, 21:28

              Connecting a fan the wrong way round may have blown the MOSFET controlling any controlled fan output that you connected it to, and the 1A fuse if you connected it to an always on output. So with power off use a multimeter to check for continuity across the fuse, from the fuse to the VIN side of the fan voltage selector jumper block, and from the centre pin of that block to the positive (V_FAN) pin of the fan output.

              Duet WiFi hardware designer and firmware engineer
              Please do not ask me for Duet support via PM or email, use the forum
              http://www.escher3d.com, https://miscsolutions.wordpress.com

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              • undefined
                3DRikat
                last edited by 13 Dec 2018, 19:15

                I checked everything for continuity and everything is working. What else could I do?

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                • undefined
                  dc42 administrators
                  last edited by 13 Dec 2018, 19:31

                  Are you sure that the fan is still OK?

                  Duet WiFi hardware designer and firmware engineer
                  Please do not ask me for Duet support via PM or email, use the forum
                  http://www.escher3d.com, https://miscsolutions.wordpress.com

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                  • undefined
                    3dmntbighker
                    last edited by 13 Dec 2018, 22:19

                    One thing counterintuitive to a lot of people is if you have one fan connected wrong or maybe bad it can kill them all. I presume it drags the supply down? It's happened to me. I got lucky and no damage occurred.

                    Scratch built CoreXY with Maestro
                    Heavily modified Ender 3 with Maestro
                    MPCNC work in progress with Duet WiFi

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                    • undefined
                      3DRikat
                      last edited by 16 Dec 2018, 18:12

                      I connected the fan to the always-on output and it's working but if I connect it to the PWM output it is not.

                      undefined 1 Reply Last reply 17 Dec 2018, 15:44 Reply Quote 0
                      • undefined
                        dc42 administrators @3DRikat
                        last edited by 17 Dec 2018, 15:44

                        @3drikat said in Duet Wifi fans not working:

                        I connected the fan to the always-on output and it's working but if I connect it to the PWM output it is not.

                        Which PWM output? There are 3. Of these, Fan 1 output defaults to thermostatic control based on hot end temperature, so you can't control it directly using M106 Snn command unless you disable the thermostatic function first.

                        Duet WiFi hardware designer and firmware engineer
                        Please do not ask me for Duet support via PM or email, use the forum
                        http://www.escher3d.com, https://miscsolutions.wordpress.com

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                        • undefined
                          3DRikat
                          last edited by 3DRikat 17 Dec 2018, 17:54

                          I tested all 3 of them. No one seems to be working.

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                            elmoret
                            last edited by 17 Dec 2018, 19:59

                            Could you post a clear, well lit photo of the area of the board around the fan headers?

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                              3DRikat
                              last edited by 19 Dec 2018, 14:26

                              0_1545229556304_ed3e921b-1147-4a22-8f74-04b154d0a868.jpg

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                                3DRikat
                                last edited by 19 Dec 2018, 14:30

                                Is this ok? What is it that you can see on a picture like that?

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                                  elmoret
                                  last edited by 20 Dec 2018, 05:45

                                  I can see blown FETs, at least one, possibly two, perhaps the third is damaged in a way that is not visible.

                                  Connecting incorrectly likely damaged the FETs.

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                                  • undefined
                                    3DRikat
                                    last edited by 20 Dec 2018, 14:05

                                    What can I do about that? Is it possible to replace them?

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                                      elmoret
                                      last edited by 20 Dec 2018, 14:52

                                      Sure, if you have a hot air rework station, or are skilled with a regular soldering iron.

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

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                                      • undefined
                                        3DRikat
                                        last edited by 20 Dec 2018, 15:51

                                        I will try it. Could you please mark the components on the picture. Because I am not 100% sure which one to desolder. And do I have to order PMV40UN2 or PMV40UN2R?

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