Surge
Should there be a paragraph about power surges (eg lightning)? None of the 9 levels/types of protection refers to surges. I came here to know more about this, and the topic no even being mentioned in the page is a bit strange. I'll look somewhere else (I have read "Storms and lightnings" here, which is useful), but I just thought a word about power surges would be an improvement.
UPS for large IT Industry
Sourav: i need to know about the UPS System for large IT industry including the make and model no. Re: "Hey, I think someone..." I agree. This is right from a Powerware brochure. This description needs to be more generic (and accurate). Will look to modify.
Hey, I think someone needs to look into why this reads like a Powerware ad. I'm in IT, and the only place I've heard "the nine power problems" is in their glossy brochures.
Can anyone tell me out there how many generations of UPS there are, and what's their difference? I just came across a GE UPS catalog claiming that GE UPS is second-generation UPS.
I agree. Honestly, it reads like a UPS vendor fear-mongering by stating as many reasons as they could think of in order to sell product. I thought "noise" was a term that meant any undesirable signal, so spikes, switching transients and harmonic distortion to me are all cases of noise. I also don't see any substantial difference between "sag" and "undervoltage." If the only difference is in duration, it would be a lot more helpful to give some sort of benchmark as to how short an undervoltage needs to be to be called a "sag" rather than a "brownout." (They're both brownouts to me.) 129.44.253.96 22:14, 14 October 2006 (UTC)
Next generation or 2nd generation typically just means their latest product. ie, the company's 2nd generation IGBT inverter indicates they have redesign this part of the product. It usually means the methodology is the same but design has been updated. This is more of a sales term than related to the UPS. Djlammi 19:40, 29 August 2007 (UTC)
I made some minor changes to the "rotary" section, as it seems a bit biased against it. Flywheel-based UPS's seem to be the up and coming tech for large datacenters. I'd like to rewrite it, but I dont really have the time. Pentadyne makes the "coolest" ones, carbon fibre spindles using maglev for low friction, significantly higher up-front cost than batteries, but much better efficiency and great density for short-duration (waiting for genset to spool up) applications. Active power is their main competition, and both have made lots of big-name sales to the likes of nasa and DoD, and of course lots of large datacenters. Methodical (talk) 05:43, 27 May 2009 (UTC)
Source
I don't believe it is necessary to source that many third world countries suffer a lot of power cuts as that kind of info has been endlessly produced in newspapers, books, etc, e.g. the Honduran newspapers are full of stories of power cuts and the problems of the local electric industry. That this makes UPSes much more popular and commonplace here can be sourced I am sure. It may take time to find a source but should be kept in in the meantime as it is pretty obviously true that when there are lots of power cuts people use UPSes to protect their computers, and they are frequently seen in Central America, part of the Third World. Large generators are also much more common here for the same reason but sourcing statements of fact may not always be straightforward. SqueakBox 14:55, 8 December 2005 (UTC)
Actually it turned out to be VERY simple. The Voltage Stabilisers paragraph here is an excellent source, SqueakBox 14:58, 8 December 2005 (UTC)
I am about to find out how much they cost here in Honduras as I need to buy one for my computer (having lost a reasonably expensive monitor yesterday as a result of the power cuts, and being drawn to this article to research before going to the shop). Computers are generally the same price here as in the UK (which will mean a little more than in the US) so obviously there are far less computers here though there is a solid minority of people with money in any Third World country, businesses use them a lot and internet cafes are everywhere. So a far higher number of UPSes per computer without a doubt and feasibly per person because they are so much more necessary. Obviously I don't have any figures but I imagine that as with generators there are more of these things per person here than in the First World per person, SqueakBox 15:24, 8 December 2005 (UTC)
Here's a more honest attempt at categorizing power problems.
If anyone is interested in editing the power problem categories in this UPS entry you are welcome to use the following white paper. The paper bases the categories on IEEE definitions.
http://www.apcmedia.com/salestools/VAVR-5WKLPK_R0_EN.pdf
This white paper may be related to IEEE definitions, but the descriptions of frequency problems are biased. The paper is written by APC, the only manufacturer that has a wide range off UPS NOT capable of correcting frequency variations. The statement "To correct this problem, all generated power sources and other power sources causing the frequency variation should be assessed, then repaired, corrected, or replaced. " is strange: you could apply this statement to all 7 problems and remove the need for a UPS. (Other than that: a good source of information)
Need your comments...
Tell something about your experience in trouble-shooting 3-Phase UPS. How did you handle it? What is the process?
-it is imperitive that unless you are a qualified electrician with u.p.s. particular experience-you should stay away from opening this type of equipment-really-all 3 phase u.p.s contain a\c and d\c voltages or capacitive discharge capability-all of which can be fatal-please-leave this type of repair work or fault finding to professionals-have a go heroes armed with unqualified internet expertise will be just as dead as those who are merely unqualified-p.j. —Preceding unsigned comment added by 82.12.99.136 (talk) 22:00, 18 January 2009 (UTC)
Generally It is better not get involved in this area without product training, and unless you have drawings and spare PCBs there isn't too much you can do. Remember that some UPS can have live power inside for long periods of time after shutdown.That said...
Most modern UPS have a large amount of fault codes and even older UPS usually have flashing/lit LEDs to indicate the state of various sections of the unit. They aren't really designed trace faults on PCBs in the field. Most companies have computerised jigs that check the pcbs. The service staff replace the board, it is all about UPS downtime. 5mins to change a PCB is much better than 5 hours repairing it.
Always start with the basics. eg.
If it won't turn on:
is the mains there > Within voltage and frequency limits and is the phase rotation correct.
The display is usually fed by the DC so if that isn't on you have a front end problem.
Power supplies/Rectifier.
A lot depends of the design of the unit and what the fault is.
The main problems are usually Batteries and fans.
Djlammi 02:21, 27 August 2007 (UTC)
Storms and lightnings
Can UPS prevent the damage caused by nearby lightning hit during the storm (or similar accidents)? This should be answered in the article.--Piotr Konieczny aka Prokonsul Piotrus Talk 21:23, 13 April 2006 (UTC)
A UPS will, to a certain degree, fix the voltage between phases and between phase and neutral. In the case of double-conversion UPS, this voltage will be 100% safe. Due to this, a nearby lighting will NOT affect the voltage coming into the protected equipment. However, most UPS have a through-going neutral. This means the neutral coming in is the same as the neutral coming out. The voltage between that neutral and the phase is 100% safe, but the voltage between neutral and ground cannot be changed by the UPS. Hence: if a lighting hits either neutral or ground, a big voltage may occur between neutral/phase and ground, which could damage equipment. To protect load against this disturbance, an additional isolation transformer would be required. Such a transformer isolates the equipment from the mains and creates a new neutral(usually)connected to ground.
I'd add that Surge suppressors are a useful addition to the Front end of the UPS. This is mainly to protect the UPS itself and mostly done in remote locations.
I have seen them put on the output of a UPS. DON'T DO THIS. The site had an generator changover panel which brakes the earth-neutral connection and the suppressors burnt out. Djlammi 22:51, 26 August 2007 (UTC)
Wouldn't this be a TVSS issue and not a UPS issue? TVSS can clamp a lightning strike, a UPS would most likely suffer massive damage on the input side if it suffered a lightning strike. —Preceding unsigned comment added by 216.203.6.12 (talk) 19:15, 18 November 2008 (UTC)
What devices are supported?
Can I use UPSs for TVs, Microwaves...etc? Or is it strictly just for computer systems?
The answer is, "that depends." I personally chewed up a couple of inverters in UPSes by connecting non-computer loads. In particular, the ones that were the standby type and produced stepped sine wave (instead of pure sine wave) are not engineered to operate anything but computer equipment (or, stuff with switching power s
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