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    12 V Fan Speed contol at 24 V input voltage

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    • aidarundefined
      aidar
      last edited by aidar

      Fan speed on Duet is controlled by PWM signal on negative (Ground) side. So whatever your positive voltage is (12v in your case after step down module) connect fan negative to fan connector negative of Duet and you can controll its speed. Read it again and do as instruction says. https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Using_12V_fans_when_VIN_is_24V

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      • Phaedruxundefined
        Phaedrux Moderator
        last edited by Phaedrux

        Example use of buck converter. https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+5:+Upgrades/54#s214

        Z-Bot CoreXY Build | Thingiverse Profile

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        • rothundefined
          roth @Phaedrux
          last edited by roth

          Thanks.
          But it is false. I want not all fans use with 12 V.
          Only one fan must have 12 V.

          @aidar said in 12 V Fan Speed contol at 24 V input voltage:

          Fan speed on Duet is controlled by PWM signal on negative (Ground) side. So whatever your positive voltage is (12v in your case after step down module) connect fan negative to fan connector negative of Duet and you can controll its speed. Read it again and do as instruction says. https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Using_12V_fans_when_VIN_is_24V

          ; Fans
          M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
          M106 P1 S0.1 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
          M106 P2 S1 I0 F500 H0:1 T50 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

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          • A Former User?
            A Former User @roth
            last edited by

            @roth said in 12 V Fan Speed contol at 24 V input voltage:

            That helps not. Well i have 12 V and 24 V fans.

            yes it will, read section 3 again. until you understand it.

            rothundefined 1 Reply Last reply Reply Quote 1
            • rothundefined
              roth @A Former User
              last edited by

              @bearer That Wiring Diagram is for a Duet Maestro.
              I have a Duet Wifi Board. The Problem is i have other Jumper and Pins. https://d17kynu4zpq5hy.cloudfront.net/igi/duet3d/4k56ZjaaAHrTJI6Z.huge

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              • Vetiundefined
                Veti @roth
                last edited by

                @roth
                as the other have suggested in this thread. there is nothing stopping you from just changing the voltage on one fan. convert any 24v line to 12v and connect the negative to the gnd pin on the fan connector.

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                • rothundefined
                  roth
                  last edited by

                  Another problem is security because the stepdown module is then directly on the power supply. The power supply delivers 300 watts.
                  I definitely have to install a fuse.

                  Vetiundefined 1 Reply Last reply Reply Quote 0
                  • Vetiundefined
                    Veti @roth
                    last edited by

                    @roth said in 12 V Fan Speed contol at 24 V input voltage:

                    Another problem is security because the stepdown module is then directly on the power supply. The power supply delivers 300 watts.
                    I definitely have to install a fuse.

                    if you want to be on the save side, why dont you just buy 5v fans and replace all of them.

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                    • A Former User?
                      A Former User
                      last edited by

                      7b52a8f3-0e9e-4f67-bc26-31411441d0ae-image.png

                      rothundefined 1 Reply Last reply Reply Quote 0
                      • rothundefined
                        roth @A Former User
                        last edited by

                        @bearer Ok Now I understand it. The problem was that I didn't understand the jumper. What he does.
                        I just checked it. From factory it ist on the right Position.

                        And I had only read that first and at that time I didn't know that the speed on the duet board would be switched over - the pole. The principle was new for me.

                        Thank you for your help and patience me.

                        Phaedruxundefined 1 Reply Last reply Reply Quote 1
                        • Phaedruxundefined
                          Phaedrux Moderator @roth
                          last edited by

                          @roth said in 12 V Fan Speed contol at 24 V input voltage:

                          Thank you for your help and patience me.

                          We're all here to help.

                          Z-Bot CoreXY Build | Thingiverse Profile

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                          • rothundefined
                            roth
                            last edited by

                            All works great. Post can be closed.

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