Best way to 12v fan on 24v system
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What is the best way to use a 12v cooling fan (no pwm) on a 24v duet system ?
Do I really need stepdown converter ?
I ask beacuse good quality 30x30 fans (Sunon and RS pro) are available in 12 and 5 volts only.
BTW if you know any vendor of 30x30x10 24v fan with at least 5CFM of airflow let me know please
thx!
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duet 3 boards allow you to set the fan output voltage to either 12v or 24v.
older boards will need a stepdown/buck converter -
@jay_s_uk said in Best way to 12v fan on 24v system:
duet 3 boards allow you to set the fan output voltage to either 12v or 24v.
older boards will need a stepdown/buck converterthx, for now I have an older duet system
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then yes, you will need one unfortunately.
run the buck converter off the same PSU as the Duet. Connect the positive of the fan to the positive of the converter. Connect the negative of the fan to the ground of the fan connection. -
ok , thx!
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Can you run 2 fans, do them in series?
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Maestro can run 24v and 5v. You haven't said which board you have.
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Duex addons allow 12 V fans on 24 V system. Feel like adding some axes to your machine?
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@Blacksheep99
does Maestro have a voltage converter ? So can I drive the system with 24 v and cooling fan with 5 to 24v ? -
@bot not yet but thank you for the input !
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@Veti
thx! -
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If it's a fixed-speed fan (not PWM), you could probably just use a dropping resistor. Measure the fan current, and set the resistance for a 12V drop. R=12/I where I is the current in amps. A buck converter is nice, but for a low-power load, where you don't care about efficiency, it's a bit of overkill.
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@paboman said in Best way to 12v fan on 24v system:
Sunon and RS pro are available in 12 and 5 volts only.
I had the same need (Sunon 12V) and a buck converter solved the problem. Sunon fans are much better than cheap Chinese fans and worth the trouble IMO.
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@paboman said in Best way to 12v fan on 24v system:
@Blacksheep99
does Maestro have a voltage converter ? So can I drive the system with 24 v and cooling fan with 5 to 24v ?There is a jumper for fan 2 so you can run the others at VIN and that at 5v. I do this on my printer. I use a Noctua 5v and the part cooling fan is a 50mm blower.
https://d17kynu4zpq5hy.cloudfront.net/igi/duet3d/x1wYdbGAsbWWvlqT.huge
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I always keep some of these on hand for powering fans, LEDs, etc. https://www.amazon.com/EBL-MP1584EN-Converter-Adjustable-Supply/dp/B08GSJVPB2/ref=sr_1_6?dchild=1&keywords=buck+converter&qid=1615381025&sr=8-6
They're dirt cheap, very small, very efficient, and seem to be reliable, but be very careful with the voltage adjustment pot. They're small and light enough that you don't have to mount them on anything- after you set the output voltage, just cover the whole thing with shrink tubing and treat it as part of the cable.
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@zapta I second the sunon fans. They last, and come in high CFM or low CFM for quieter.
I personally think the best way is to put wire two 12V in series though
more fans! ( Edit: 
OK ok, I was being facetious there and I'll clarify this is NOT the way to do it, but the responses did bring me a smile 
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@lord-binky said in Best way to 12v fan on 24v system:
I personally think the best way is to put wire two 12V in series though more fans!
It may work, assuming the two fans identical (same current consumption) and if PWM controlled, are subject to the same control.
(I have no experience with multiple fans in serial so don't know for sure).