Re: 90v dc brake voltage

I'm not following something here.

if all you are using is a brake, why do you need a transformer ?

there is only a magnetic field in the coil, like a relay.

a simple fuse at something above rated power and you are set.

The isolation transformer will eleminate electronical signals from
noisy circuits, but it does not seem that you would need one in this
application. Certanly not from a personal safety issue.

If you check the ratings of the brake, you may have quite a bit of
range as 110 is more than 20% larger than the 90V rating.

Dave




--- In CAD_CAM_EDM_DRO@yahoogroups.com, Eric Keller
<unterhausen@y...> wrote:

> I have a Gidding and Lewis servomotor with a 90vdc
> brake. They suggest that I can just take the 115vac
> line from the wall, pass it through a bridge and use
> that for the voltage (there is something else in the
> circuit, but no isolation). That impresses me as a
> good way to kill myself.
>
> Since I don't have any isolation transformers, I was
> thinking about taking two transformers of suitable
> amperage rating and puting them back to back. This
> should work, right? Do I have to worry about
> saturation?
>
> On a similar vein, I was thinking that there is no
> harm in using a 3 phase transformer on a single phase
> circuit. Am I missing something in my ignorance?
>
> Eric "I'm going to die sooner or later, hopefully not
> today" Keller
>
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