FANS 12V GND CONNECTION TROUBLE



  • Hi,

    i was reading some posts again about the suppy of 12v fan with 24v duet.
    (I have given 12v from external p.s. to the middle pin of Vfan but my 12v fans still doesnt run)

    One thing bring my attemption... I always see that is speaking about buck converter foer have 12v.
    and that the V_IN+ and V_IN- of the bucket regulator is taken from duet.
    In my electronic i reserved a dedicated 12v P.s. and i connected only 12V+ from my ps to middle pin of fan.

    May be that fans doesnt run becouse i have not connected the 12V- ? and the gND of duet are different circuits?

    If yes, how i can have the fan running using an external p.s that is not supplyed by 24V of duet,
    but in a different way. (220v directly)

    Thanks



  • @logriso said in FANS 12V GND CONNECTION TROUBLE:

    May be that fans doesnt run becouse i have not connected the 12V- ? and the gND of duet are different circuits?

    yes, there needs to be a common ground.

    @logriso said in FANS 12V GND CONNECTION TROUBLE:

    If yes, how i can have the fan running using an external p.s that is not supplyed by 24V of duet,
    but in a different way. (220v directly)

    running a 220v fan? you'd probably need some sort solid state relay, or running a 12v fan from a power supply that is powered from 220v? the latter sill needs the grounds of the 12v and 24v to be connected together.



  • @bearer ..no...I write in a bad way..Ithe line of 220V is the line that power my 12V supply that i want to use for intenal light, fans and any future option running to 12v

    Based on your answer, how do you suggest to me connect the GND terminal of my 12V p.s. to be part of the same circuit of the fan?

    Shoud I connect in the same terminal of negative duet? (V_IN-) or there is the risk to damage the board?

    Have i any different soution to run my fans?

    Bye



  • @logriso said in FANS 12V GND CONNECTION TROUBLE:

    Shoud I connect in the same terminal of negative duet? (V_IN-) or there is the risk to damage the board?

    Yes, both 24v- and 12v- to V_IN- (should be safe unless there is a problem with the power supplies causing the DC output to be refrenced to the live input)

    (or as dc42 says; choose the location that is most convenient, the important thing is they are connected together, not where)


  • administrators

    Connect the negative output of your 12V PSU to the negative output of your main 24V PSU.



  • Ok thank at all.. tonight i will try.


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