Re: [foxboro] AW power consumption

Dave,
        We went the route of a bigger UPS because we weren't sure how much
stuff we were going to hang on it when we initially installed it.  Your
power estimates sound kinda high.  We have thirty NEC FP1375X 22" flat CRT's
that are rated at 1.6 AMPS @ 110VAC, thirty four NEC 2010X 20" LCD flat
screens rated at .5 AMPS @ 110VAC, twenty four PC's with dual video cards
installed at 2.8 AMPS @ 110 VAC, twelve WP-51D's, with dual video cards,
which I agree are difficult to determine, but our configuration indicates
max draw of 2.8 AMPS @ 110VAC, three Foxboro IE-32's, three 1x8's, 10 radio
base stations, a host of alarm lights and horns, a closed circuit camera
system, and several network switches and hubs.  We installed a 50KVA UPS
that is currently 19% loaded when running all of that equipment so a 10 KVA
unit would have been the exact size we needed to operate if we didn't allow
for expansion or start-up.  There is a lot of slop already built into the
ratings as the info taken from our system shows.  If I include the rated
info for only the processors and video screens in the calculation it would
indicate an 18.2 KVA system is required.  We are operating more equipment
than that and drawing only 10KVA.  I hope this info is helpful to you and
others pondering this question.  I'm not sure how the individual components
are rated by the manufacturers.  Does it have to do with start-up current
draw or full load current times a factor?  If anyone knows I am interested
in finding out.

                        Amps/           Nominal Total   Total   Total
Device  Qty     each            VAC             Amps    VA      KVA
CRT's           30      1.6             110             48      5280    5.28
LCD's           34      0.5             110             17      1870    1.87
PC's            24      2.8             110             67.2    7392
7.392
WP-51D's        12      2.8             110             33.6    3696
3.696
                                                
                                Totals          165.8   18238   18.238

Tom VandeWater
Control Systems Developer/Analyst
Dow Corning Corp.
Carrollton, KY

-----Original Message-----
From: David Johnson [mailto:David.Johnson@xxxxxxxxxxxxxxxxxx]
Sent: Monday, February 17, 2003 3:44 PM
To: Foxboro@xxxxxxxxxxxxx
Subject: [foxboro] AW power consumption



Hello List,

I am trying to size a UPS for several (many) AW/WP D boxes.  After looking 
at the power supply on the back of one, it reads 110-120V, 6A.  That is, I 
think, about 720 watts.  That sounds really high to me.  I don't think the 
box is hot enough to have the equivalent of 7, 100 watt light bulbs in 
it.  Is this the maximum amount that the Sun's power supply will consume 
before it smokes?  Does anyone know the nominal power consumption with one 
hard drive and dual monitors.  The monitors claim 3A @ 110v (~350 watts) 
which seems more in line with empirical evidence.

Once I know how much current is being drawn per AW and how long things have 
to ride through, I can size the UPS accordingly.  (Of course we could just 
get a really BIG UPS, but that seems wasteful.)

Regards,
David Johnson


PREMIER System Integrators
Phone:  (256) 355-1732
Fax:    (256) 355-9088
Email   David.Johnson@xxxxxxxxxxxxxxxxxx

 
 
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