Re: [CAD_CAM_EDM_DRO] Re: gecko's and voltage

We need to petition Gecko to make their drivers work with 90+Volts.
Many of the good servo motors are rated for 90V and step down
transformers offer very good VAs for the money.

Kim

On Sat, 2003-07-05 at 14:56, Lee Studley wrote:
> Hi Kim,
> I ran into the same issue in retrofitting my Bridgeport. You need to
> drop the primary voltage in this case somewhat, and my solution was
> to add a autoformer. This is a fixed varaic type transformer that is
> compact, since the 'dropping' winding carries most the current. It is
> a non-isolated transformer that drives the primary of your
> transformer.
>
> Another way os to add a series bucking transformer winding which is
> actually made by making a regular transformer act like the above
> mentioned autotransformer. ***Be careful*** with whatever you try,
> and us a variac to bring it up so you can measure output current and
> voltage. Its easy to hookup the winding backwards and it will add to
> your primary and boost the voltage. This may exceed your filter caps
> rating.
>
> There are plenty of these transformers at air conditioner places to
> drop 240 to 203 volts and can be used if rated properly. The
> impedence isnt perfect as they are made to run at 240vac, but it
> will work in practice. The inrush current is higher.
>
> -Lee
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Kim Lux <lux@d...> wrote:
> > I sent them an email about the same thing, but bigger voltage.
> >
> > I'd like to use a HD 240/120 stepdown transformer to supply some
> servo
> > motors. Using 120V as the source, we get 60V AC output, which is a
> bit
> > under 85V DC when rectified. Furthermore, the power around here
> runs
> > higher than 120VAC. I've measured 87VDC on the output of the power
> > supply circuit.
> >
> > I haven't received a reply from them yet and I sent that email a
> week
> > ago.
> >
> > Kim
> >
> >
> > On Sat, 2003-07-05 at 11:27, cnchomeman wrote:
> > > I bought some gecko320's. My powersupply
> (transformer/bridge/cap)
> > > measures 80.8 volts no load. This is a whole .8 volts over the
> max.
> > > Anyone have any comments on this? I am currently running on 65
> volts
> > > (my transformer has a few taps). I would like to try the 80.8
> volts,
> > > but am new to gecko's and don't want to let the smoke out.
> > >
> > > Eric
> > >
> > >
> > >
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> OFF Topic POSTS: General Machining
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> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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--
Kim Lux <lux@...>