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:[email protected]] Sent: Monday, June 12, 2000 2:58 PM To: [email protected]; [email protected] 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:[email protected]] > 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
