George/Mike: I worked for 6 years in deep UPS and power quality at PG&E in Silicon Valley including IEEE1159 and CBEMA curve. Our field work demonstrated that if an automatic transfer does not take place at one quarter of a cycle in a 60 cycle per second AC power supply, then the sensitive logic controllers of any network equipment, PLCs, etc will detect the automatic transfer as a possible zero voltage condition. The weblink provided below did not specify the automatic transfer switch cycle time (see pages 18 to pages 23). A true UPS with continuous power will actually provide your utility power source through a battery system including power conditioning along with generator backup. I had the opportunity to work with the FAA in Fremont, California which has true UPS> it was quite a setup.
So you may want to ask at what level you of continuity you need for your wireless network. I know of a few subject matter experts in the industry should you need a consultant. Felix Energy and Wireless practioneer Silicon Valley Area --- Mike Hammett <[EMAIL PROTECTED]> wrote: > You can change this all via the APC management > software. > > > ----- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com > > > ----- Original Message ----- > From: "Eric Muehleisen" <[EMAIL PROTECTED]> > To: "WISPA General List" <wireless@wispa.org> > Sent: Saturday, June 30, 2007 12:23 PM > Subject: Re: [WISPA] Low cost generator > > > > Travis, > > How do you go about tweaking a UPS? We use APC > 750's at most small tower > > sites. During the event of a power outage we use > 1000watt generators but > > as you said...the UPS just shuts off and on, > repeatedly. > > > > -Eric > > > > Travis Johnson wrote: > >> Brad, > >> > >> You can adjust the sensitivity of the APC UPS's > to handle just about any > >> type of incoming power. We have run a tower off a > cheap Home Depot > >> 2000watt by adjusting the APC so it would not > keep switching off an on. > >> > >> Travis > >> Microserv > >> > >> Brad Belton wrote: > >>> We have found many (most all?) <10kW "job site" > type generators do not > >>> work > >>> well if at all with APC UPS. In the event of a > power failure we simply > >>> rent > >>> a 25kW towable diesel generator. Granted 25kW > is way overkill for most > >>> any > >>> HUB site, but apparently the larger generators > provide "cleaner" power > >>> that > >>> the APC UPS's are happy with. > >>> > >>> Does anyone have one of these 7kW Guardian > standby generators in use > >>> with > >>> APC UPS's? $1999.00 delivered with transfer > switch is a pretty strong > >>> deal! > >>> > >>> Best, > >>> > >>> > >>> Brad > >>> > >>> > >>> > >>> > >>> > >>> -----Original Message----- > >>> From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > >>> Behalf Of Scott Reed > >>> Sent: Saturday, June 30, 2007 11:30 AM > >>> To: WISPA General List > >>> Subject: Re: [WISPA] Low cost generator > >>> > >>> The Guardian comes as small as 7KW for about > $2100 and goes up a long > >>> way from there. > >>> I have seen Guardians at cell sites and waste > water lift stations around > >>> here. > >>> > >>> George Rogato wrote: > >>> > >>> > http://www.electricgeneratorsdirect.com/catalog/product_info.php?products_id > >>> =538 > >>>> I'm in the market for a generator and came > across this one. > >>>> The auto transfer switch and propane caught my > eye and I figured I'd > >>>> share it with the list. > >>>> > >>>> > >>> > >>> > > > > -- > > WISPA Wireless List: wireless@wispa.org > > > > Subscribe/Unsubscribe: > > http://lists.wispa.org/mailman/listinfo/wireless > > > > Archives: > http://lists.wispa.org/pipermail/wireless/ > > > > -- > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > ____________________________________________________________________________________ Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos & more. http://mobile.yahoo.com/go?refer=1GNXIC -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
