Very strange behavior, CoreXY with external drivers
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testet, konstant 4.45V. I take the 5V from the breakout board. Should i take it from the main board?
Or direct of the power supply? -
@capricorn, I mean the main power to your external stepper drivers - 12V, 24V, 36V or whatever you are using.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@capricorn said in Very strange behavior, CoreXY with external drivers:
i test that... but i think so, cause i serve 5V to the board with a extern 50W power supply
how do you wire the two power supplies? i think the negative needs to be connected between the two, but i am not 100% sure.
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konstant 41V motors driving , i´m using a 600W power supply
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i dont think 41v is supported
https://duet3d.dozuki.com/Wiki/Choosing_the_power_supply
The Duet 2 (Wifi and Ethernet) work with a VIN supply of between 11V and 25V
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@veti
i don´t think so.... -
this is the power for the external motor drivers, not to the duet2
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please draw a diagram. this is getting confusing.
including all power supplies and the wires between them.
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@veti
that´s easy.12V and 5V go to the duet2
41V go to the external motor drivers -
and how are the power supplies connected to each other?
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this are 3 different power supplies. one end each to 220V the other end to the 5v/12v input duet2 and 41v to the motor drivers. No direct connection (except 220V) between them.
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see this for the wiring of the duex
https://duet3d.dozuki.com/Wiki/Duex2_and_Duex5_Features#Section_Wiringthe entire wiring is about avoiding current flow between gnd connections.
and in your case you have several non connected gnd connections.
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not suitable for me, because i have no duex2 oder duex5 board. i have the duet2 ethernet and the expansion breakout bord. the breakout board is only connected by the 50Pin connector
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it would still cause a grounding loop.
https://en.wikipedia.org/wiki/Ground_loop_(electricity)there is also a very specific warning for the duet where you have a separate 5v supply via usb.
see
https://duet3d.dozuki.com/Wiki/USB_ground_loops -
hmmmm... now i´m unsure myself.... maybe dc42 can light this issue up?
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@capricorn said in Very strange behavior, CoreXY with external drivers:
to clarify how my extern drivers are connected:
all Step+/Dir+ from the ext. drivers go to +5V.
all Step-/Dir- from the ext. drivers go to the corresponding pins on the breakout boardI can not read in its description, where the EN pins of the external drivers are connected.
@capricorn said in Very strange behavior, CoreXY with external drivers:
To the question of groundloops...
is my power distribution ok?
GND (-) from all sources should be a common point, to that the logical levels that reach the external drivers are measured with respect to a single GND of the entire system.
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@capricorn said in Very strange behavior, CoreXY with external drivers:
not suitable for me, because i have no duex2 oder duex5 board. i have the duet2 ethernet and the expansion breakout board. the breakout board is only connected by the 50Pin connector
Can you provide photos of your wiring between the expansion breakout board and the stepper drivers, so that I can check it?
@veti said in Very strange behavior, CoreXY with external drivers:
it would still cause a grounding loop.
https://en.wikipedia.org/wiki/Ground_loop_(electricity)
there is also a very specific warning for the duet where you have a separate 5v supply via usb.
see
https://duet3d.dozuki.com/Wiki/USB_ground_loopsShould not be a problem if the 5V and main PSUs are in the same case, fed by the same mains cable.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42
I think you won't see much.
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