Pure Sine Wave UPSes for New Dell PCs
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From: Tom Lake on 16 Apr 2010 09:01 > Indeed. Lately I seem to be the mug that people with ye olde APC > units seek out to verify they work before spending on refurbing the > battery department. One unit - a 1995 SmartUPS 2000XL - required AC > before it would boot, whereas the next series (1999) SmartUPS 2200XL > will do a cold start if you know the technique. Why they aren't ALL > cold-start-capable beats me. Even though they can do it, it looks like APC still advises against it due to potential damage to components. Tom Lake
From: Tom Lake on 16 Apr 2010 09:06 "Tom Lake" <tlake(a)twcny.rr.com> wrote in message news:hq9mr9$6sk$1(a)news.albasani.net... > >> Indeed. Lately I seem to be the mug that people with ye olde APC >> units seek out to verify they work before spending on refurbing the >> battery department. One unit - a 1995 SmartUPS 2000XL - required AC >> before it would boot, whereas the next series (1999) SmartUPS 2200XL >> will do a cold start if you know the technique. Why they aren't ALL >> cold-start-capable beats me. > > Even though they can do it, it looks like APC still advises against it due to potential > damage to components. > > Tom Lake I was looking at an older manual, I guess. The current (no pun intended!) manuals don't seem to have this warning. All they say is that, "Cold start is not a normal condition" Tom L
From: William R. Walsh on 16 Apr 2010 16:13 Hi! > Not that I'd do this but for my information could you run a > 1500 watt heater plugged into the battery side of a 500 > watt UPS. Ah, you'd better not. If the UPS was of a standby design (meaning that it only runs the load from its battery when the power is out or out of tolerance) you would be fine right up to the point where the power failed. If you were lucky, the end result would just be a sudden shutdown with the UPS complaining about an overload. However, I'm inclined to think that the UPS will try to support the overload, maybe even do so for a little while and then go poof. At that point you'd smell the acrid odor of burnt silicon. (It's one of those few stenches that tells you in no uncertain terms that something has gone terribly, terribly wrong and may now be on fire.) A UPS that supports its load continually from the inverter (providing an additional layer of protection, as well as no switching delay) should also shut down when overloaded--but I suspect that it too will try and possibly go "boom". William
From: who where on 16 Apr 2010 21:23 On Fri, 16 Apr 2010 09:06:06 -0400, "Tom Lake" <tlake(a)twcny.rr.com> wrote: > >"Tom Lake" <tlake(a)twcny.rr.com> wrote in message news:hq9mr9$6sk$1(a)news.albasani.net... >> >>> Indeed. Lately I seem to be the mug that people with ye olde APC >>> units seek out to verify they work before spending on refurbing the >>> battery department. One unit - a 1995 SmartUPS 2000XL - required AC >>> before it would boot, whereas the next series (1999) SmartUPS 2200XL >>> will do a cold start if you know the technique. Why they aren't ALL >>> cold-start-capable beats me. >> >> Even though they can do it, it looks like APC still advises against it due to potential >> damage to components. >> >> Tom Lake I hadn't seen that. >I was looking at an older manual, I guess. The current (no pun intended!) >manuals don't seem to have this warning. All they say is that, "Cold start >is not a normal condition" That I have seen, and it isn't "normal" in client ops, but it is fairly routine in servicing.
From: who where on 16 Apr 2010 23:15
On Sat, 17 Apr 2010 09:23:49 +0800, who where <noone(a)home.net> wrote: >On Fri, 16 Apr 2010 09:06:06 -0400, "Tom Lake" <tlake(a)twcny.rr.com> >wrote: > >> >>"Tom Lake" <tlake(a)twcny.rr.com> wrote in message news:hq9mr9$6sk$1(a)news.albasani.net... >>> >>>> Indeed. Lately I seem to be the mug that people with ye olde APC >>>> units seek out to verify they work before spending on refurbing the >>>> battery department. One unit - a 1995 SmartUPS 2000XL - required AC >>>> before it would boot, whereas the next series (1999) SmartUPS 2200XL >>>> will do a cold start if you know the technique. Why they aren't ALL >>>> cold-start-capable beats me. >>> >>> Even though they can do it, it looks like APC still advises against it due to potential >>> damage to components. >>> >>> Tom Lake > >I hadn't seen that. > >>I was looking at an older manual, I guess. The current (no pun intended!) >>manuals don't seem to have this warning. All they say is that, "Cold start >>is not a normal condition" > >That I have seen, and it isn't "normal" in client ops, but it is >fairly routine in servicing. I should point out here - for the benefit of the uninitiated - the usual caveat:- "do not try this at home. The display you have seen was performed by a trained professional under controlled conditions" There is a real hazard involved when a UPS is fired up on battery with NO grounding. Dangerous voltages can be present on battery terminals as well as the (obvious) output loads - and even on their chassis. The normal 3-pin AC cord provides safety grounding when connected. In our workshop, cold starts are *only* performed with an auxiliary grounding lead. |