Re: [CAD_CAM_EDM_DRO] Series I followup

Jerry,

Thanks for the help on the transformers. I had studied that stuff a long
time ago. I am re-learning from you.


Tom Eldredge

----- Original Message -----
From: Carol & Jerry Jankura <jerry.jankura@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, May 06, 2001 5:20 PM
Subject: RE: [CAD_CAM_EDM_DRO] Series I followup


> The current rating of a transformer is a function of the wire size used to
> wind it, not the voltage at which it is run. Let's assume the easiest
> example first: A transformer consisting of two windings. A primary rated
at
> 240 Volts Input and a secondary rated at 120 Volts. The secondary is rated
> for 10 amps. If you run this transformer at 240 volts input, you have a
2.4
> KVA transformer (240 volts multiplied by 10 amps) If you choose to run
this
> transformer at only 120 volts input, you have a 1.2 KVA transformer (120
> volts multiplied by 10 amps).
>
> In the next example, we will take a transformer with two primary windings
> and two secondary windings. This is typical of many industrial
transformers.
> Assume that each of the four windings is rated at 120 volts and 10 amps.
>
> You can connect the two primary windings (generally labeled H1 and H2) in
> series to use an input voltage of 240 volts. You can connect the
secondaries
> (generally labeled X1 and X2) in parallel to get an output voltage of 120
> volts at 20 amps. You could also connect them in series to get an output
> voltage of 240 volts at 20 amps. You can also connect the two primary
> windings in parallel for an input voltage of 120 volts. With this
> configuration, connect the two output windings in parallel for 120 volts
at
> 20 amps or in series for 240 volts at 10 amps. Connect the two primary
> windings in series and use an input voltage of 120 volts and you can
connect
> the two output windings in parallel for an output voltage of 60 volts at
20
> amps.
>
> The only thing you can't do is connect the two primary windings in
parallel
> and use an input voltage of 240 volts. Doing this would most likely
saturate
> the transformer core and cause a high current to flow in the primary until
> either a fuse blew or the transformer overheated and started burning
itself
> up.
>
> -- Carol & Jerry Jankura
> Strongsville, Ohio
> So many toys, so little time
>
>
>
> -----Original Message-----
> From: Vlocci [mailto:VLOCCI@...]
> Sent: Sunday, May 06, 2001 5:46 PM
> To: cadcam
> Subject: [CAD_CAM_EDM_DRO] Series I followup
>
> With a 240 volt input it is good for 15 amps. I
> could always run it on 120 volts input, but I'm not sure if 7.5 amps will
be
> enough output. (which leads to my next question) I'm assuming the
benefit
> of these 160 volt drives comes from increased speed?
>
>
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: 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@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
> FAQ: http://www.ktmarketing.com/faq.html
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>