12V Fans with 24V Setup

cosmowave

Hello, i'm completely new in the world of Duet3D.
I have a question about 12V Fans in a 24V Setup.

I think, it should be possible to supply only the Fans with a separate 12VDC Power Supply? Like in the following picture?

Note: This scheme is simplified! I know, that the Duet also needs the GND connection!

But can you confirm me, that this setup will work?
Will also the "allways on" Fans powered with 12VDC in this setup?

An other question:
I have a water cooled hotend. My cooling circuit has a flow detector and i'd like to stop the printing process when no flow is detected.
The flow sensor is acting like a (normally open) switch.
Is it possible to connect the flow sensor to the E1 Endstop and stopping the running print with it?
I think, with the correct mapping and programming it should be possible?

Thanks for your answer. And also thanks for developing this awesome hard-/ software!

cosmowave

Edit: there is a fault on the scheme!
The Box in the 12VDC Supply should not be 24V!

OwenD

@cosmowave said in 12V Fans with 24V Setup:

question:

The duet documentation covers this here

https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Using_12V_fans_when_VIN_is_24V

bruce

@cosmowave
You need something like this
https://www.amazon.co.uk/QLOUNI-Converter-3-0-40V-Adjustable-Regulator/dp/B077VW4BTY