Geeetech

In my firmware i've add pwm feature,from 0 till 100% https://zonalimitatore.blogspot.com/201 ... liano.html
A jumper near fan connection has no functions.If you extract fan not work.JP2 nothing to do with 12v out.It give 5v out

I measured voltage at fan leads and it is indeed 24volts. For me, combat1 suggestion is all that was needed to change in firmware to gain pwm control. I have wired 2 12v fans in series for fang type cooling now.

Wait.What fan you talking?
I mean the blower,and i've set pwm work on my firmware

I mean the part cooling fan. There was some talk and youtube videos suggesting only 12v going to 24v fan and requiring jumper. In my experience, it wasnt the voltage problem it was firmware problem that needed to be commented, as combat1 pointed out. You must have figured it out already with your own firmware. I used the firmware posted by Micheal on thingiverse(see other thread here on a10 forum), but i still needed to change the soft start fan comment in his firmware per combat1 finding in order for my cooling fan to gain pwm control. Sorry for any confusion.

No no...it's my confusion!!!!
Yep,in my firm i add pwm control and many others improvement

The problem is to be solved on 3 fans and not on one.
If the Jp2 jumper is open, the fans will reach a maximum of 12 volts right?
This voltage is not sufficient to make the fan work properly on the Bowden heatsink (because the fan is 24 volts) which will therefore not cool the heatsink well and there will be a clogging before the nozzle.
This thing has already happened to me leaving the jumper open.

299/5000
In fact I solved with only one potentiometer connected to the PJ2 jumper.
In this way the Jumper is open (just do not put the potentiometer to maximum) and you can adjust the voltage from 12 to 24 volts, then the voltage regulator does the rest. Noise is gone and the prints are excellent.

dinopoli wrote: Thu Nov 29, 2018 6:10 am 299/5000
In fact I solved with only one potentiometer connected to the PJ2 jumper.
In this way the Jumper is open (just do not put the potentiometer to maximum) and you can adjust the voltage from 12 to 24 volts, then the voltage regulator does the rest. Noise is gone and the prints are excellent.
2.jpg
4.jpg

Wow.That's awesome!

dinopoli wrote: Thu Nov 29, 2018 6:10 am 299/5000
In fact I solved with only one potentiometer connected to the PJ2 jumper.
In this way the Jumper is open (just do not put the potentiometer to maximum) and you can adjust the voltage from 12 to 24 volts, then the voltage regulator does the rest. Noise is gone and the prints are excellent.
2.jpg
4.jpg

hi,
whats the value (ohm) of the Potentiometer you've used?

Thanks, br