Re: Correct or Max voltage for Bridgeport Nema 42? + mo...

Hi Matt,
I've got the origianl SeriesII triple set of transformers, of which I
removed the control transformers. This leaves the 3 supplies main
tranformers,bridges,caps. I'm running those at 110 volts (vs th e
original 220) which gives about 88vdc each. Then I went nuts and
made 3 regulators which can span about 20V at 10amps and can be
adjusted, to create the final 75vdc. The regulators have current and
device SOA protection that trips a master supply relay when exceeded.

Alan Marconett KM6VV proposed a neat simpler alternative:

>Hi Lee,
>Yes, 88V is a little high. What you can do is find a 12V (or as
>desired) filament transformer with a secondary current the same or
>greater then the PRIMARY current needed by your transformer. Connect
>it in SERIES BUCKING, and you can drop the resultant secondary

voltage >as required. This sounds similar to what your "control
transformers" > might have been doing! But simpler, smaller!

>Kinda like a "fixed" VARIAC!

HTH

--- In CAD_CAM_EDM_DRO@y..., "Matthew King" <mattking@k...> wrote:
> What sort of power supply are you using? A pre-built 75vdc supply?
Or did
> you build your own?
>
> Thanks,
>
> Matt
>
> -----Original Message-----
> From: studleylee <indigo_red@q...>
> To: CAD_CAM_EDM_DRO@y... <CAD_CAM_EDM_DRO@y...>
> Date: Monday, February 11, 2002 11:09 PM
> Subject: [CAD_CAM_EDM_DRO] Re: Correct or Max voltage for
Bridgeport Nema
> 42? + mo...
>
>
> >Hi,
> >I'm currently running mine at 75vdc with Geckos 210's and it seems
> >to be fine. I figure from tables I've seen the voltage spec on the
> >coils is between about 2.5-3v if series connected (full coil) so
I'm
> >pushing the 20x over voltage limit. The current limiting is the key
> >to keeping the coils healthy. The Geckos reach a trip current
> >threshold then the current is switched off. Until the next cycle.
> >
> >-Lee
> >
> >--- In CAD_CAM_EDM_DRO@y..., JanRwl@A... wrote:
> >> Ray:
> >>
> >> And Sean, who's originating question I did not read, so I do not
> >know "who he
> >> is": Just because the schematics show a 56 VDC supply, and the
BP-
> >1 uses
> >> Size 42 motors, this does NOT mean those are "56 Volt steppers"!
> >Not at all!
> >
> >
> >
> >Addresses:
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