Duet3 VIN fuse
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Hi everyone!
TL;DR: how much current can draw the Duet3 through VIN terminals? I see on the dozuki portal that the VIN fuse is specified at 10A, but the board came with 15A one.
A bit of context.
I recently got a Duet3 MB 6HC to revamp an old 3DSystems Cube Pro Trio.
The final configuration will feature:- 24V PSU + 24V/12V stepdown converter
- 2x 24V Dyze extruder+hotend w/pt100
- 3xNEMA17 for X&Y axis
- 1xNEMA23 for Z axis
- 1x220V Heated Bed (w/SSR)
- 1x220V Heated Chamber (w/SSR)
- 1x12V 800l/h water pump for watercooling
- some 12V fans for the wc radiator and whatnot
and obviously a Duet3 MB 6CH w/pt100 daughterboard & RPi 4B.
Initially I thought of using DC/DC SSR for each one of the 60Wmax DYZE hot ends since I was not comfortable running ~230Wmax through the Duet3; given the 24V VIN, it was too close to the 10A of the VIN fuse.
(Don't mind the 12V stuff since it would be powered directly from the stepdown DC/DC converter; it's the watercooling pump&fans and it would take waaay more than the 800mA total rated from the D3MB)
But now I see the board comes with a 15A VIN fuse and I wonder if I can safely run those 230Wmax and ditch the SSRs for the hotends.
Thanks for any reply and have a nice day
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There are two VIN power inputs to the board:
https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Wiring_Diagram
Both are fused for 15A on production boards. That said, you are well under the limit: As you run both hot ends at 24V, together thats 2x60W = 120W @24V =5A. That leaves 10A for the stepper motors and onboard power requirements which is plenty.
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I have updated the documentation.
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thank you for the kind reply, much appreciated!
have a nice day/evening
