Duet 3 6HC Driver Cooling
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In the documentation the chapter about cooling of the Duet 3 6HC does still contain „TO DO“.
I am currently using it with Nema17 motors were cooling should not be an issue. However since I start to like it more and more I am thinking about buying another bord for my CNC which uses Nema24 motors.
The 6HC bord is specified to support up to 4 A RMS and 6.3 A peak.
I am currently asking my self, at which current the drivers will need which kind of additional cooling?Is it sufficient to blow with one 140x140 fan sideways to the 6HC bord or will there be any specific cooling required if the bord shall provide its maximum driver current on 4-5 drivers?
This is the setup I currently plan to build. I am not 100% sure if I will mount the main bord horizontal or vertical.
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@lala I have no experience with the Duet3 6HC. But i think your shown setup will be fine. You cool the front- and backface of the board, that's perfect.
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@lala I don't have active cooling on either of my Duet 3 boards
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@lala see this 3HC for some thermal testing we did https://duet3d.dozuki.com/Wiki/Duet_3_Expansion_Hardware_Overview#Section_Thermal_tests
6HC should be pretty similar.Ian
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@lala Another data point. I'm running Nema 23s at 2.3Amps on a 6HC and also a 3HC. The boards are not enclosed but have no active cooling either. The drivers are barely warm to the touch after multi-hour prints.
But running all drivers at 6.3 Amps peak, then you might need active cooling. It's generally best to blow air at the underside of the board. So if you are able, then raising the board up, further away from the PSU (which may also get hot) would be better. Either that, or turn the board 90 degrees so that it's vertical rather than flat and more air from the fan will reach the board (and less radiant heat from the PSU too).
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Ok thank you all. Then I may just flip it by 90 degrees and mount it to the side of the PSU. Due to the PanelDue the enclosure has some space available there anyway.
