5v Always On Fan Wiring



  • Hello all,

    So with my setup I will be using 24v input power and leaving the V_FAN jumper connected to the VIN pin. I am planning on connecting the fan I am using for cooling the board to the 5V output pin for the Panel Due since it will be unused in my case; however, i will also be using a 5V fan for cooling the hot end (both 5V fans are Noctua for noise reduction).

    Would connecting both 5V always on fans in parallel to the 5V output in the Panel Due be advisable or would that be drawing too much current? I understand they draw little current already but I just want to confirm so I don't damage the board.

    Thanks in advance!

    (P.S. Using the Panel Due for the 5v output since I will be using a BL Touch and from what I have seen it will take up pins that I would need on the expansion header.)



  • Actually, looking through at the drawing for the pin outs again I noticed that there is a +5V and GND pin unused at CONN_SD, could that also work as an always on power source?



  • There seems to be 4x +5V pins that might be used:

    1. Panel Due connector
    2. Pin 1 on the 50-pin expansion header (not usable if using an expander, though the expander might also expose 5V; also you said using the BL Touch on this pin).
    3. CONN_SD
    4. 5V pin from the V Fan Jumper Select

    All of these should have 5V when the board have power. Diagram at https://duet3d.dozuki.com/Wiki/Duet_Wiring_Diagrams

    Although there is limited 5V, it can run a 7" PanelDue, so I think you should be fine with the 2 fans.
    Ultimately you will run the 2 fans in parallel, so if you can and want to, you can simply run them from the same pins - electrically it does not matter.



  • @jacotheron

    That does make sense that ultimately they would be in parallel, thanks for the clarification and help!


  • administrators

    @red-sand-robot said in 5v Always On Fan Wiring:

    Hello all,

    So with my setup I will be using 24v input power and leaving the V_FAN jumper connected to the VIN pin. I am planning on connecting the fan I am using for cooling the board to the 5V output pin for the Panel Due since it will be unused in my case; however, i will also be using a 5V fan for cooling the hot end (both 5V fans are Noctua for noise reduction).

    Would connecting both 5V always on fans in parallel to the 5V output in the Panel Due be advisable or would that be drawing too much current? I understand they draw little current already but I just want to confirm so I don't damage the board.

    That should be OK if they are small fans drawing 500mA or less each.


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