Re: gecko's and voltage

When I first joined the group I was on this rant too, The design for
higher voltage is complicated and will at least double the costs of
these drives. Really take it from my experience, you really dont need
to run those motors to the max @90v. Try hooking it up to a car
battery and see how much torque just at 12volts. I serioulsy doubt
you'll ever need the top end speed at 90v under real-life conditions.
-Lee

Check out for my previous msg:
http://www.electrical-contractor.net/ubb/Forum15/HTML/000058.html

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Kim Lux <lux@d...> wrote:
> 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
> > > >
> > > >
> > > >
> > > > Addresses:
> > > > FAQ: http://www.ktmarketing.com/faq.html
> > > > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > > > Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> > > >
> > > > Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> > > > Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> > > > List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
> > wanliker@a..., timg@k...
> > > > Moderator: pentam@c... indigo_red@q... [Moderators]
> > > > URL to this group:
http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> > > >
> > > > OFF Topic POSTS: General Machining
> > > > If you wish to post on unlimited OT subjects goto:
> > aol://5863:126/rec.crafts.metalworking or go thru Google.com to
reach
> > it if you have trouble.
> > > > 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........
> > > > bill
> > > > List Mom
> > > > List Owner
> > > >
> > > >
> > > >
> > > > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> > > --
> > > Kim Lux <lux@d...>
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> >
> > Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> > Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> > List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
wanliker@a..., timg@k...
> > Moderator: pentam@c... indigo_red@q... [Moderators]
> > URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> >
> > OFF Topic POSTS: General Machining
> > If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach
it if you have trouble.
> > 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........
> > bill
> > List Mom
> > List Owner
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> --
> Kim Lux <lux@d...>