Very strange behavior, CoreXY with external drivers
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thank you, for your help, i´m just about cabling the printer. i can test it, when everything else is running.
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Are you sure that the power to your external stepper drivers is stable? I am wondering whether when they are driving the motors, the voltage could be dropping.
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i test that... but i think so, cause i serve 5V to the board with a extern 50W power supply
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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.
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@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.