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02-09-2021 #1
Hey guys,
My name is Hristo, I am from Plovdiv, Bulgaria.
I have tried to make my first hobby cnc machine, but my experience of electronics is very small.
I have a question about Grounding, Earthing. I have to note before, that our building is old, and there
are only 2 conductors, and we have not separate conductor for Earthing unfortunately. This system
is TN-C and TN-C-S. In this case, we have to use “neutral” for this kind of Earthing.
The main elements of electronic are: Arduino Uno; 3 steppers-NEMA 24- 3,1 N.m; 3 stepper-drivers-
SH-750- 5A, PSU-s - one 36V DC for steppers, and other - 12V DC for fans, (5V for Arduino from
computer‘s USB).
I will not use a VFD for motor-spindle. I have intention to use routing motor-spindle, and I will
connect it directly to 230 V- AC, and will be no connection to controller.
I will Grounding 2 PSU by “neutral” in “star” point (in TN-C-S system), but I am afraid to connect
in this “star” point stepper drivers (GND) and Arduino (GND). I think, that it will be too risky.
To install separate ground rod is not easy task.
What do you think about this situation ?
Best regards
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