Duet 3 32v Hotend heaters and fans
I want to supply 32v to duet 3 but cannot find heaters or fans at this voltage. Is it possible to use a 32V to 24V buck converter to power the heaters and fans?
How would it connect to the board?
I had thought of this, which is capable of providing 3A (24 * 3 = 72W)
the same applies to the heaters https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Using_12V_fans_when_VIN_is_24V
(but for the duet 3 i think it provides 12v as an alterntaive to Vin/32, still the above link will show how to connect the dc/dc converter)
In the case of fans, the solution is simple, but in the case of heaters, there is no jumper to put the voltage of the buck converter.
Wire the positive wires of 12V fans directly to the buck regulator output, and the negative wires to the FAN- pins of the controlled fan outputs as usual3
do the same for the heaters, wire the positive from heaters straight to dc/dc positive output and make sure dc/dc negative output is connected to 32v negative, and leave the heater negative connected to the heater outputs.
In the example scheme I have seen that the negative output of the buck converter does not connect to anything. It is right?
deckingman last edited by
@nomad You could possibly use a small wattage 24V heater. For example, if you wanted say 60 Watts then (if my maths serves me right), a 24V 30 Watt heater would have a resistance of about 19.2 Ohms. So feeding it 32 Volts would draw a current of about 1.7 Amps giving about 54 Watts which might be near enough?
most dc/dc converts are non-isolated, so the negative input and output are already connected; as such no additional wiring needed for the negative side.
which is why i said make sure they're connected instead of insisting to connect them.