Re: Electronic Box Shielding ?

Hi,

Not a dumb question at all.

1) Use steel. It is a magnetic as well as electric field shield.
2) If you can, have it contain the motor power supply as well.
3) Use an RFI line filter on the 115VAC where it enters the box.
4) Use a 5-conductor shielded cable / motor. The 5th conductor goes
from motor case to ground inside the box.
5) Ground the shield at the box end. Do not connect the far end.
6) Establish a "holy point" ground inside the box. All internal
ground wires go to this single point. Everything that needs a ground
wire gets a seperate, individual wire from this point.
7) Keep inputs (STEP, DIR) apart from motor output leads.
8) Shield input cables the same way as (5).
9) Do not run limit switch and other aux lines thru the box.
10) Ground the box to earth ground.

Follow these simple rules and you will prosper.

Mariss
Geckodrive Inc.

--- In CAD_CAM_EDM_DRO@egroups.com, Hugh Currin <currinh@O...> wrote:
> Exhaulted Electronic Wizards:
>
> The third in my series of three (maybe dumb) questions. :-)
>
> With chopper stepper drivers, computer electronics, etc. I'm
> convinced there is a great amount of electomagnetic noise
> created. I'd like to contain and master it. :-|
>
> SO, if I build a box for my electronics and ground this
> box will it supress electromagnetic energy escaping the box?
> I'm sure it can so now for the real questions, does the box
> need to be steel, i.e. magnetic, or will aluminum work as
> well??
>
> Then if I connect the ground from this box to a step up
> transformer and plug it into the wall, can I make my electric
> meter go backwards? Only kidding in this paragraph. :-)
>
> Thank you for your help.
>
> Hugh Currin
> Klamath Falls, OR