[NSRCA-discussion] Luminex Power supply

[Scott McHarg]

Bob,
  Thank you VERY much.  This is good news!  I still want a nice
generator...maybe for Christmas but it's good to know my Harbor Freight
cheapy is OK.  :)  Thank y'all again!

On Wed, Jul 13, 2011 at 12:13 PM, Bob Kane <getterflash at yahoo.com> wrote:

> I feel compelled to respond to this . . . .
>
> While it is true many electric powered devices are sensitive to the
> frequency of the incoming AC power (linear power supplies and anything that
> contains one, classic TVs, AC motors and anything that contains one, etc.),
> digital power supplies are not as sensitive. They rectify the incoming AC
> power directly into DC to power their own high frequency generator (this is
> what the "switching" part of the name is all about) which in turn goes
> through a transformer and is rectified again to produce DC power.  There is
> a rule in transformars that the size of the transformer for a given power
> rating is inversely proportional to the operating frequency.  So by
> generating a very high frequency AC signal, the transformer can be much
> smaller for a given power rating than the equivalent 60Htz transformer. That
> is why a 600 watt switching power supply is much smaller and lighter than
> the linear equivalent.
>
> In the end, as long as you are not at the power limits of a cheap
> generator, I would not worry about it.
>
>
> Bob Kane
> getterflash at yahoo.com
>
> --- On *Mon, 7/11/11, Keith Hoard <khoard at gmail.com>* wrote:
>
>
> From: Keith Hoard <khoard at gmail.com>
> Subject: Re: [NSRCA-discussion] Luminex Power supply
> To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
> Date: Monday, July 11, 2011, 5:30 PM
>
> Scott,
>
> Something I learned from one of our club members who owns an HVAC business.
> . . get a generator with an inverter.  The cheaper generators (like my $199
> Tractor Supply special) are basically an alternator connected to a Bliggs &
> Sratton motor with a mechanical governor keeping it on speed.
> .
> If you start approaching its power limits or the motor begins losing it
> rhythm, bad things happen with the volts and Hertz and then you let the
> magic smoke out of your power supplies and chargers in a big $$$$-shaped
> cloud.
>
> Keith Hoard
> Collierville, TN
> khoard at gmail.com <http://mc/compose?to=khoard@gmail.com>
>
>
>
>
> On Mon, Jul 11, 2011 at 2:42 PM, Scott McHarg <scmcharg at gmail.com<http://mc/compose?to=scmcharg@gmail.com>
> > wrote:
>
> Thanks Mark.  I appreciate this.  I was looking at the Luminex Chris Moon
> sells and just wondering if my little generator would hold up.
>
> On Mon, Jul 11, 2011 at 2:40 PM, Atwood, Mark <atwoodm at paragon-inc.com<http://mc/compose?to=atwoodm@paragon-inc.com>
> > wrote:
>
> The math is correct, but you need to add about a 10% loss factor, or even a
> little more.  My Iota 55am power supply under a full 55amp load pulls about
> 850.   More importantly, my Iota will frequently deliver in excess of that
> 55amps for short periods of time and draw over 900.  I'm currently using a
> Honda 1000watt generator without any problems.
>
>
> Mark Atwood
> Paragon Consulting, Inc.  |  President
> 5885 Landerbrook Drive Suite 130, Cleveland Ohio, 44124
> Phone: 440.684.3101 x102  |  Fax: 440.684.3102
> mark.atwood at paragon-inc.com<http://mc/compose?to=mark.atwood@paragon-inc.com>
> <mailto:mark.atwood at paragon-inc.com<http://mc/compose?to=mark.atwood@paragon-inc.com>>
>  |  www.paragon-inc.com<http://www.paragon-inc.com/>
>
>
>
> On Jul 11, 2011, at 3:24 PM, Scott McHarg wrote:
>
> Can someone give me a rough idea of how big a generator I need to run the
> Luminex power supply?  I have a small 2-stroke 800W generator from Harbor
> Freight but not sure how to tell how many Watts I need to power the Luminex
> supply. Volt x Amps=Watts?  So, can I draw the conclusion that something
> that puts out 55 Amps at 13.4 Volts needs 737 Watts input?
>
> Thanks y'all,
> Scott
>
> --
> Scott A. McHarg
>
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>
> --
> *Scott A. McHarg*
>
>
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-- 
*Scott A. McHarg*
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