RE: [CAD_CAM_EDM_DRO] Re: Variable Transformer

Both good points.

The second one is unique to the variac, but the first point could equally
apply to an isolated supply, or ANY high-voltage AC or DC supply.

Andy Wander
Verrex Corporation

-----Original Message-----
From: turbulatordude [mailto:dave_mucha@...]
Sent: Wednesday, June 29, 2005 8:50 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Variable Transformer

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Andy Wander <awander@v...> wrote:
> John:
>
> Thanks for your comment.
>
> I actually hooked up a variac power supply circuit last time we got into
> this, and made some voltage measurements, etc.
>
> I didn't see any reason why, IF it was hooked up properly, and IF
the stuff
> that it was powering could deal with a DC supply that was balanced with
> respect to ground, there should be any additional danger.
>
> That was why I asked the question in the first place, because I suspect
> there MUST be some reason behind it(unless it's just an old wive's tale,
> stemming from incorrect hookup, etc?), but I can't seem to get an answer
> from any of the folks who say that they know.
>
> Just comments that imply I am lazy, stupid, or just out to give
folks a hard
> time.
>
>
> Andy Wander
> Verrex Corporation


IIRC, the negatives included grounding that if not done properly could
make the entire machine 'live' and electrocute those with roaming
fingers, but more dangerous is that if one were to set the transformer
to one voltage and it somehow was changed, the voltage might go high
and destroy the other electronics.

Depending on your point of view, getting a nasty shock may not be as
bad as blowing up a trio of expensive drivers !

Dave




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