12 V Fan Speed contol at 24 V input voltage

timcurtis67

Try a buck converter to drop the 24V down to 12V for certain fans.

aidar

Fan speed on Duet is controlled by PWM signal on negative (Ground) side. So whatever your positive voltage is (12v in your case after step down module) connect fan negative to fan connector negative of Duet and you can controll its speed. Read it again and do as instruction says. https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Using_12V_fans_when_VIN_is_24V

Phaedrux

Example use of buck converter. https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+5:+Upgrades/54#s214

roth

Thanks.
But it is false. I want not all fans use with 12 V.
Only one fan must have 12 V.

@aidar said in 12 V Fan Speed contol at 24 V input voltage:

Fan speed on Duet is controlled by PWM signal on negative (Ground) side. So whatever your positive voltage is (12v in your case after step down module) connect fan negative to fan connector negative of Duet and you can controll its speed. Read it again and do as instruction says. https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Using_12V_fans_when_VIN_is_24V

; Fans
M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S0.1 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P2 S1 I0 F500 H0:1 T50 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

A Former User

@roth said in 12 V Fan Speed contol at 24 V input voltage:

That helps not. Well i have 12 V and 24 V fans.

yes it will, read section 3 again. until you understand it.

roth

@bearer That Wiring Diagram is for a Duet Maestro.
I have a Duet Wifi Board. The Problem is i have other Jumper and Pins. https://d17kynu4zpq5hy.cloudfront.net/igi/duet3d/4k56ZjaaAHrTJI6Z.huge

Veti

@roth
as the other have suggested in this thread. there is nothing stopping you from just changing the voltage on one fan. convert any 24v line to 12v and connect the negative to the gnd pin on the fan connector.

roth

Another problem is security because the stepdown module is then directly on the power supply. The power supply delivers 300 watts.
I definitely have to install a fuse.

Veti

@roth said in 12 V Fan Speed contol at 24 V input voltage:

Another problem is security because the stepdown module is then directly on the power supply. The power supply delivers 300 watts.
I definitely have to install a fuse.

if you want to be on the save side, why dont you just buy 5v fans and replace all of them.

A Former User

roth

@bearer Ok Now I understand it. The problem was that I didn't understand the jumper. What he does.
I just checked it. From factory it ist on the right Position.

And I had only read that first and at that time I didn't know that the speed on the duet board would be switched over - the pole. The principle was new for me.

Thank you for your help and patience me.

Phaedrux

@roth said in 12 V Fan Speed contol at 24 V input voltage:

Thank you for your help and patience me.

We're all here to help.

roth

All works great. Post can be closed.