Re: [CAD_CAM_EDM_DRO] Shielded cable connections - help

The primary reason for not connecting both ends of the shield is so that it
WILL NOT become a conductor. If you connect both ends, then you stand the
chance of cross-coupling signals, etc. That wire connected to both ends,
acting as a conductor, is now capable of turning stray magnetic fields into
current. Connecting both ends kinda defeats the purpose of shielding. I
never worked as an engineer in a 'motor-factory', but I did work at Bell
Telephone's Indian Hill Research Lab in Naperville, IL. And before that,
Burrough's (now UNYSIS) Corp. at Great Valley Labs in Paoli & Downingtown,
PA. I was taught that the ground termination should be done at the signal
supply end of the cable. (Sometimes, we would connect the 'other' end
in-series with a de-couplong capacitor.)

RayHex

----------

> From: JanRwl@...
>
> In a message dated 24-May-02 19:23:19 Central Daylight Time,
> ja_erickson@... writes:
>
>
> > just have a simple question, i don't know where to hook up the
> > shielding part of my shielded wires that go to my axis motor drivers
> > and my axis motors? can anyone offer any experience or insight?
> >
>
>
> Some folks, even those "engineers" at the motor-factories, say to connect

the

> shield only at ONE end. Perhaps in some instances, this is wise. But I
> protest it is the exception! I connect my motor-cable-shields both to

that

> little green screw on the back of (Superior Electric) motors, and to the
> chassis of whatever driver. If the "electronics" are mounted "in

plastic",

> and there is NO voltage-differential between the motor (your

machine-chassis)

> and the (-) terminal of your motor power-supply, then connect the other

end

> there. Or, if using Gecko, the (-) terminal on it (Is that the first

one? I

> forget, and am too lazy to go look!). BUT, never use the shield to

"conduct"

> power!
>