External stepper drivers with combo Duet 2 WiFi & Duex 5
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Hi Everyone, Happy easter!
(If you don't feel like reading all it's summed up in the last paragraph
)I've been running a corexy printer gor a few years now using a duet 2 wifi and duex 5 for some extra steppers (currently only for 2 extra Z but planning for extra extruders) and other small stuff like humidity, extra temps etc.
I have two 24v power supplies on my printer, a meanwell a 750 for the bed and a 500 for the rest.
I was thinking of using the 48V that I have available to properly run ldo speedy's (42STH47-2504AC) for my X and Y but since the duet can only handle up to 25 I think the only way is to have external stepper drivers.
Is there a way that I can add external stepper drivers capable of handling 48V onto my current setup using both the 2 wifi and duex 5?
(My X and Y are still on the main board.)All input welcome, thanks!
Kaj
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@kaj there are two additional stepper channels (10 and 11 I think) on the panel due header for the Duet Wifi which provide EN, STP and DIR signals, which should work for you if you aren't using the panel due.
Alternatively, you can put the Duex5 into Duex2 mode, and break out the three unused EN, STP and DIR signals from the expansion connector. Exactly how to do this depends on which version of the Duex that you have - you'll find details in the Duex documentation pages
Shout back if you need more details
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@engikeneer Thank you! I had not yet read about those! I did indeed find old posts for turning the duex5 into a 2 or even modding the ribbon and just removing 1 resistor or something but I didn't want to mess with the duex5.
I'll look further into the first option you mentioned as I don't use a paneldue, thanks!Now I now what to look further into.
I'll probably get back with more questions later as I'm really not that good with these boards and related electronics. Without the awesome community and good docementation I wouldn't even have gotten past initial setup probably.Now I need to figure out the drivers I want to use and what to buy.
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Going back to the doc https://docs.duet3d.com/User_manual/Connecting_hardware/Motors_connecting_external I must have thought the the CONN_LCD was only usable without the expansion board but it's just the paneldue that can't be used. Great
Edit: putting in the updated doc instead of duzoki.
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@kaj
It will be hard to find stepper driver expansion boards capable of 48V. They usually have 35V capacitors onboard, which you'd have to remove. Adding a bigger 60V cap is easy, when you use capacitors with wire leads.
With a little luck, you can use the BTT Exp-mot board It comes with two 10 pin ribbon cables and should be compatible with the duet2.The only HV-driver I know of that comes in pololu style layout is the TMC5160.
But you probably want to go a different route and buy TB6600 drivers? (42V max.)
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@o_lampe tha ks for the input! I'd be okay with soldering if it's not on an expensive board like the duet
really not out of the water which drivers I'm wanting to get either. Why do you like one over the other? Is it heat? -
@kaj
I'd choose the DM542 driver, it superseeds the TB6600 and isn't much more expensive.
The TMC drivers are very quiet, but their configuration (either jumpers or UART/SPI) can be difficult.
