Thread: Why star ground????
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01-02-2016 #2
No simple or easy answer to this because Noise and grounding is black art in it's self. Basicly what you trying to do is provide a path for any stray voltages to reach Ground and not feed back into the system. If you have multiple grounds then you provide alternative routes which can feed back into more senstive cables like Step & direction etc.
While you may get away with out noise issues using the ground setup you describe then for the little effort it takes to create a Single STAR point it's not worth taking the risk. I promise if you do get affected from noise it will take 200 times longer to track down than put in the STAR point, it will also drive you mental trying to find.!!
Regards grounding/Earthing BOB etc then you need to know the difference between AC & DC and how they work.
In your system you have AC devices like PSU's the input side should be connected to Mains Earth often called Ground. These PSU will then Give DC output with voltage and 0V connections. The 0v is often called Gnd. This is completely different to Mains AC Ground and is local to that Voltage source.
Your BOB, DRIVES and any other DC powered device use there own Local power source so don't need grounding. The source that creates the DC is connected to Mains Earth.
So the only things you want going to STAR point are from AC devices like PSU's and Any shields etc.
Edit: Here's a rough layout of how it would go with Star Ground.
Last edited by JAZZCNC; 01-02-2016 at 10:21 PM.
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