thanks "Nix, Rodney" wrote:
> 52Vdc is the nominal charging voltage for a 48Vdc battery plant. > Occasionally, as part of the maintenance of the plant, this voltage will be > raised to equalize the individual battery cell voltages. This is equalize > charge voltage of 54Vdc was used primarily with lead-acid battery plants and > is used less frequently now that so-called maintenance-free batteries are > the norm. > > Rodney B. Nix > Sr. Hardware Validation Engineer > Tollgrade Communications, Inc. > 493 Nixon Road > Cheswick, PA 15024 > > -----Original Message----- > From: Bruce Touzel [mailto:btou...@acc.com] > Sent: Monday, June 12, 2000 2:58 PM > To: nebs@world.std.com; dho...@excelsus-tech.com > Subject: Re: The -48VDC CO rail ... > > What about the charging voltage put on the batteries ? > Wouldn't that be higher ? > Would they remove the batteries from equipment during this charging period ? > > Don House wrote: > > > -46vdc to -56vdc with an average float of -52vdc in my 30+ years of Bell > > System experience. > > > > Personally, I have never seen a C.O. voltage higher than -54vdc nor lower > > than -48vdc. > > (Except for a special -72vdc buss for range extension that is no longer > > used.) > > > > Don > > > > Don Robert House, MTS > > Excelsus Technologies, Inc. > > (760) 476-1511 Office > > (760) 476-1519 FAX > > (760) 420-3016 Cellular > > URL: http://www.excelsus-tech.com > > > > -----Original Message----- > > From: Doug [mailto:dmck...@gte.net] > > Sent: Thursday, June 08, 2000 9:33 AM > > To: Nebs Discussion Group > > Subject: The -48VDC CO rail ... > > > > Two questions ... > > > > 1. Would anyone care to relate personal experiences, > > anecdotes, concerning the stability or non-stability > > of the -48VDC rail in a CO? > > > > Just how bad is it? > > > > 2. I think I'm finally understanding the meaning of the > > upper Bellcore range of 56 vdc. UL testing would require > > +6% above 56 which puts it right at 60VDC. Any change > > increasing the upper limit in the spec would push the > > voltage into the hazardous voltage area ( >60VDC ) changing > > all the test limits. Do I have that correct? > > > > Where'd the lower Bellcore voltage spec some from? > > > > Regards, Doug McKean
