multiple voltages on DUET and DUEX

[johanV]

HI,
just a quick question.
I have a coreXY printer with 3 Z motors and 4 printheads.
all the movement motors are connected to a duet-ethernet board and the extruders are connected via a duex5.
I want ge increase the speed of the axis and i want to see if changing the powersupply to 24V makes adifference.
all the printheader are 12V.

can I connect the Duex board to a different voltage as the mainboard?
so I would connect the duex ( and thus the extruders and fans ) to 12V
an the duet to 24V.
in time i wille probably replace the heater cartridges and fans but because this is only a test, i want to avoid doing a maybe useless expence.

i appologise if this is a question already answered in forum but I could not find an answer.

thankx in advance.

[dc42]

@johanV I think that should work provided that you power up the DueX before you power up the Duet. Once you power up the Duet and its VIN voltage exceeds about 10V, the firmware will assume that all the stepper drivers are powered up and it will try to initialise them.

If/when you switch the DueX to 24V VIN you can set the DueX fan outputs to use the on-board 12V regulator. You will still need to change the heater cartridges to 24V ones.

[johanV]

@dc42
ok, thus it is not without risk then.
maybe I wil do the testing of the motion system without the duex connected.
when i am convinced that 24V is an improvement for me, then I wil just have to buy the heaters cartridges.
i did not know about the fans and the onboard regulator.
thank you for the tip!!