Topics created by DigitalElf

@DigitalElf
I realize this post is 3 months old but thought for other CNC users looking to isolate their NPN Axis End Stop switches this might be of use , protoboard and opto isolators cost $15 , this is for a duet2 wifi

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opto isolator x 4 on my Delta , allows you to use what ever voltage the sensor works best with ( in my case 24volts) , isolates the high voltage from the low , decouples any kind of line noise from steppers etc and doesn't toast the board if you plug it in backwards

in config file use

M574 X2 S1 P"!xstop" ; configure active low endstop for high end on X via pin xstop !prefix

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@DigitalElf I suggest you check what stepper motor current is being set. If it's more than 2000mA then you should consider using a fan to cool the Duet - see https://docs.duet3d.com/Duet3D_hardware/Duet_2_family/Duet_2_WiFi_Ethernet_Hardware_Overview#cooling. Otherwise I can't think of any reason not to move the Duet if you take the usual precautions, e.g. use thick enough wires for the current they carry, and for those wires that go between static and moving parts restrain the cable at both ends to avoid it being flexed at the connectors.

@DigitalElf the part we use is this one https://uk.farnell.com/wurth-elektronik/61900411121/header-2-54mm-locking-4way/dp/1841378 which is a clone of this Molex part https://uk.farnell.com/molex/22-29-2041/connector-header-4pos-1row-2-54mm/dp/1360132. The rated current of the Molex part is 4A per contact, see https://www.farnell.com/datasheets/1867467.pdf. The Wurth part has a lower rating of 3A per contact, still more than the 2.5A max peak motor output current of the Duet 2.

When connectors get charred like that, it's usually an indication that the crimp connections to the mating contacts were not well made, causing the pins to overheat.