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    topic_unsolved Voltage decreases after putting a fan into the fan port

    Duet Hardware and wiring
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    • K3K5
      K3K5 last edited by

      Hello,

      i have a 24V fan wich should be controlled by the temperature, but when the temperature 45° reached the fan doesnt spin.
      Here are the config lines:

      First the lines from the config.json: "fans":[{"value":0,"inverted":false,"frequency":500,"thermostatic":true,"heaters":[1],"trigger_temperature":45},{"value":0,"inverted":false,"frequency":500,"thermostatic":false,"heaters":[1],"trigger_temperature":45}]

      And here the lines from the config.g: ; Fans
      M106 P1 S1 F500 H1 T45 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
      M106 P0 S0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off

      The temp controlled fan is pushed into fan 1 and the other fan in fan 2

      Another fact is that the voltage decreases when i plug in the fan, before there are 24V and if the fan is plugged in there are only 5,8V.

      I hope you guys can help me...thanks

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      • SIam
        SIam last edited by SIam

        did you use a turbine 😉 what happens when you connect the fan directly to 24 V? have you try to lower / upper the pwm frequency

        K3K5 1 Reply Last reply Reply Quote 0
        • K3K5
          K3K5 @SIam last edited by

          @SIam no a normal 40x40x10 24V Sunon fan...if i connect the fan directly to 24V it runs normaly

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          • SIam
            SIam last edited by

            and if you lower the pwm frequency of this fan to f100

            K3K5 2 Replies Last reply Reply Quote 0
            • K3K5
              K3K5 @SIam last edited by

              @SIam i try it out tomorrow

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              • A Former User
                A Former User last edited by

                Where are you measuring this? There could be some voltage drop over the switching FET, but 5v is more than I'd expect. Are you measuring when the output is set to 100% if not your meter may struggle getting an accurate reading as well.

                K3K5 1 Reply Last reply Reply Quote 0
                • K3K5
                  K3K5 @Guest last edited by

                  @bearer i measure the 5,8V at the fan connection but the cable is not the problem because when the fan is connected to the always on fan port i can measure the 24V at the fan

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                  • K3K5
                    K3K5 @SIam last edited by

                    @SIam doesnt changed anything tried freq 10000 and freq 100 still only 5,8V and no spinning fan

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                    • SIam
                      SIam last edited by

                      please try to connect the fan to a other pwm output and report the result

                      K3K5 1 Reply Last reply Reply Quote 0
                      • K3K5
                        K3K5 @SIam last edited by

                        @SIam the next Port worked, so is the first one broke ?

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                        • SIam
                          SIam last edited by

                          it look like that the mosfet from fan 0 is faulty

                          K3K5 1 Reply Last reply Reply Quote 0
                          • Quattro
                            Quattro last edited by Quattro

                            Are you running a 24V fan on 5V? It is going to be slow. I connected mine to E1 heater on the Duet.

                            K3K5 1 Reply Last reply Reply Quote 0
                            • K3K5
                              K3K5 @SIam last edited by

                              @SIam can i replace it ?`its the mosfet from fan1

                              A Former User 1 Reply Last reply Reply Quote 0
                              • K3K5
                                K3K5 @Quattro last edited by

                                @Quattro no the voltage drops to 5,8V when the fan is connected and if i remove the fan the voltage is 24V

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                                • A Former User
                                  A Former User @K3K5 last edited by

                                  @K3K5 said in Voltage decreases after putting a fan into the fan port:

                                  can i replace it ?

                                  https://github.com/T3P3/Duet/tree/master/Duet2 schematics are available

                                  1 Reply Last reply Reply Quote 0
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