Would be nice to set FAN target speed by RPM instead of PWM

dragonn

@BoA In my opinion they is only one, good 5015 fan - Sunon MF50151VX-A99
I put it in all my printers and recommend to every one.
Even that it is 12V only it is worth the hassle to add a step-down to run it.
It maybe not the quietest at 100% but is super powerful and if you need to be more quite just run it slower.

Veti

@dragonn said in Would be nice to set FAN target speed by RPM instead of PWM:

Sunon MF50151VX-A99

what about he MF50152VX-1L01C-Q99?

24V and pwm.

theruttmeister

@BoA said in Would be nice to set FAN target speed by RPM instead of PWM:

@theruttmeister OK. Perhaps You are right. I build a mass flow sensor once, but for 3d printing it might be an overkill. Just looking on how the blowers are made I thought the major difference is RPMs capability.

The original request, setting fan speed in rpm not pwm %, is still a good one!

dragonn

@Veti said in Would be nice to set FAN target speed by RPM instead of PWM:

@dragonn said in Would be nice to set FAN target speed by RPM instead of PWM:

Sunon MF50151VX-A99

what about he MF50152VX-1L01C-Q99?

24V and pwm.

No idea, first time I see that model. But it isn't available outside in regular shops, only on aliexpress. I am buying A99 in a regular electronics store and paying less for that one.

BoA

@Veti Can I connect MF50152VX-1L01C-Q99 directly to 4pin fan header on duet3? With 24V voltage?

Veti

@BoA
the duet 3 has 4 pin fan connectors for pwm fans.
check that the fan voltage is set to vin.

BoA

@Veti That is clear. My concern was voltage on tacho pin and pwm pin. Well... perhaps only tacho.

Veti

@BoA
i think the hardware overview makes it pretty clear

https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Hardware_Overview

6 PWM controllable fan channels. 3 of these support 4 wire fans including tacho reading. These can be run from either the input voltage, from 12V, or from external power for added flexibility. Also one always-on fan connector supplied with VIN voltage.

BoA

@Veti Ok. I will give it a try soon

A Former User

@BoA said in Would be nice to set FAN target speed by RPM instead of PWM:

My concern was voltage on tacho pin and pwm pin.

they're generally active low to avoid voltage issues