Re: [CAD_CAM_EDM_DRO] Re: Parallel Port to Power Supply Grounding Differential

Yes sir! (I know this is off topic so I wont continue)
I had many many problems for years with my computers. You name it.
Main problem is the sensitivity that a Computer above 2Ghz has. Since AGP
runs .5vdc or 1.5vdc or .8vdc (Video Card) and the motherboard ground (or DC
(-)) is generally the case ground also, and that in turn is same as AC
ground, your computer would reak havok on a regular basis with say 4 to
50VAC total on Ground Loops (or not-really-grounded Grounds...)

I found from one side of my room to another there was almost 50VAC between
all the computers and equipment looping through all the Surge-Protecting
Power Strips. Yikes! Hammered a new ground in at the Power box and Yes
(dont debate this!) Neutral from there does get grounded at the powerbox.
Then every bit of noise related issues were completely gone.. Revelation!
I've since found the offending Power Strips also, and a few other wall wart
transformers were causing alot of the feedback. They have been replaced
also.

Incredible fix, but incredibly simple to check...

Vince

----- Original Message -----
From: "Don Rogers" <Don@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, July 08, 2003 10:07 AM
Subject: [CAD_CAM_EDM_DRO] Re: Parallel Port to Power Supply Grounding
Differential


> One thing I haven't seen mentioned here is that the AC input to the
> components of the system which includes the PC, controllers, and machine
> motors etc, all need to share a common ground, and that is the building
> ground.
>
> Each electrical outlet should be tested to insure that it is properly
> wired. Two wire extension cords are a no no. When checking frame to
frame
> grounding, use an analog VOM. A digital will some times pick up transient
> voltages and give bad readings. Your ground system should be like a tree.
> One point of grounding to earth ground, and only one path to earth ground
> from any point in the system. For example, if you use shielded leads to
> your steppers, the shields should be tied together at chassis that holds
> the drivers, but not to the motor end as the machine frame should also be
> tied back to ground. Signal ground and machine ground should be tied
> together at the chassis end, IE at the power supply, IF you are using a
> grounded signal.
>
> The one path is important as you will set up what it termed "Ground Loops"
> which can induce some very intermittent problems, as well as some
> spectacular sparks at times if multiple paths to ground are
> available. Back in my old Main Frame Computer days, we would survey a
> customers computer room and almost always would find ground issues. And
> almost always, when the issues were fixed, the problem rate would drop.
>
> I also have a question for the group that relates to this subject. What
> kind of cabling do you use, Plugs and sockets. Routing, Etc. I am just
> building up my Taig, and am finding the cable issue to be a problem, some
> needs to be very flexible, all needs shielding. What AWG sizes do you use
> for the motors, IE for 55v 7a motors. How are you routing your
> cables. And last does anyone have a source for reasonable priced AMP
> connectors?
>
> Don
>
>
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