Electronics cooling fan on RRF3
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@the_dragonlord said in Electronics cooling fan on RRF3:
Are you sure? I know that a 4 pin driven with only pins (power) does'nt work.
It should. I've never seen either a data sheet or an actual fan that doesn't. If you connect just the power and ground of a 'normal' four wire fan, it should run at full speed - the fan includes an internal pull-up on the PWM , so if that wire is left floating it goes high and fan runs at full speed.
The reason that four-wire fan connectors have the polarisation lugs in a funny place is so that they work three-pin connectors, leaving the PWM line unconnected.
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@Phaedrux said in Electronics cooling fan on RRF3:
You must understand that the PWM used by the duet isn't the same as the 4 wire PWM fan would use normally. The duet is just switching the negative side at a frequency to approximate PWM. (Though you can actually wire up a 4 wire PWM capable fan and use it as intended as well). This method is rather effective most of the time but not all fans work well with it. I'm suggesting that the 4 wire fans probably would take to it just fine.
I've changed the fans and now it works like a charm!
Thanks!