Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: bpratl on March 09, 2016, 03:31:57 PM
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I'm in the process of rewiring my Mach3 Lathe controller due to noise problems and I have a few questions:
1. Should I connect the 5 Volt and the 48 Volt negative returns together or leave the outputs floating?
2. Should the negative outputs be isolated from equipment grounds, like Pc, Lathe and controller which are grounded to the GREEN AC ground.
3. Is it better use an external 5 volt power supply for the BOB or is the USB input OK, PROS & CONS?
4. Is it wise to add EMI/EFI filter and if so where should they be installed.
Bob
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EMI filters in the supply line to the power supplies and if you have a VFD i would put one in the supply to that too.
Generally i would not connect any power supply rail - +or- to to any other line or chassis etc.
USB should be ok, but personally i would go for a small 5v supply as it means dragging one less cable for the pc and so less chance of feeding muck back to the pc.