Will 12v fan on 24Vin blow up the board?



  • As subject says. I forgot to replace the fan and after power up there was something blowing up

    The 12v fan was connected to F0 and my vin is 24v 10A

    What kind of damage am I looking at? Mosfets only? More damage?
    Will all the pwm ports be affected by this?
    Are drop downs ok to use here?

    All pwm fans are now not controlled anymore but just always on full speed


  • administrators

    The only components likely to have been damaged are the mosfets and of course the fan.

    You mustn't use drop downs on the fan outputs (other than the always-on fan output), however you can remove the fan voltage select jumper and feed 12V into the centre pin in order to use 12V fans. However, 24V fans are readily available,.



  • @dc42
    Thanks for the response! Not many radial 4020 blowers on 24v

    But can connecting wrong fan to one port destroy all of the FAN outs?

    Followup question
    I also connected the bl touch before making it 3.3v ready --- Are more components now dead?


  • administrators

    @pro3d said in Will 12v fan on 24Vin blow up the board?:

    @dc42
    Thanks for the response! Not many radial 4020 blowers on 24v

    But can connecting wrong fan to one port destroy all of the FAN outs?

    Shorting one fan output can damage a trace on older Duets, or blow the 1A fuse on revision 1.03 Duets. But in that case, the fans won't run at all.

    Followup question
    I also connected the bl touch before making it 3.3v ready --- Are more components now dead?

    Unlikely. We can't guarantee it, but the endstop and Z probe inputs will generally tolerate a lot of over-voltage without damage.


 

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