It should work, But In our particular case the question was "what is the automatic transfer time between the UPS inline with the backup generator?" what is the switch over time??? And at what voltage threshold does it switch. IEEE 1159 and the CBEMA curve typically recommend to start looking at 65% to 60% of nominal voltage when switching to backup. The weblink your provided on page 18-23 discusses this point (see the operators manual) But they don't specify the automatic transfers cycle time. We typically called APS, or Exide and also generator manufacturer to ask for what is called relay coordinaton settings.
Felix --- George Rogato <[EMAIL PROTECTED]> wrote: > I was hoping to use my apc ups's inline with the > back up generator. > > Any reason why this won't work? > > > Felix A. Lopez wrote: > > 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 > > -- > George Rogato > > Welcome to WISPA > > www.wispa.org > > http://signup.wispa.org/ > -- > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > ____________________________________________________________________________________ Luggage? GPS? Comic books? Check out fitting gifts for grads at Yahoo! Search http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
