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Ups how to convert computer ups to run fan and inductive flourecent lamps?

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  • tkondago Sep 08, 2008

    inductive load like Fan and flourescent tubelight with ballast is not working with comuter UPS. How to convert it to make it run fan and other inductive devices?

  • ricky8205 Feb 08, 2009

    just now my APC smart -UPS 1000VA UPS sysytem got a problem it was overheat can u help how to find the problem and what should i do to remain a good condition of my UPS.. pls help me to solve this problem.. thank you very much.. more power..


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I use my ups to run a fan, a lite, and my computer while I shut it down. An ups is only as good as it's battery. The larger the ups and it's battery, the more watts you can use. The battery will determine how many watthours you get. Some people will put a car battery to an ups. The ups may overcharge the battery and dry it out. The battery may be too much for the ups charging circuit and burn it out, dead ups. I put a 12 volt computer fan on my ups to keep it from overheating, another problem that comes up when you overuse an ups. Where I am, you have to deal with a power company that is not reliable, so I go the extra mile to get more comfort when the power is out.

Posted on Sep 08, 2008

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Clear Battery Fault

How old is the UPS? While NiCad's and Nickel Metal Hydride thrive on use, including running down to near zero. I'm not aware of any UPS's which have that option. At some point all batteries loose their ability to charge 100%. Could be they charge enough to trip the charger off, however not enough to keep from the Error message.

FYI, around twice a year I remove the batteries in my UPS's (I have five) and run them down. 12v fans, or lamps are what I use, but really anything that will drain would be fine.

IMHO I'd be checking who has the best prices so you will be ready.

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Computer wont start, despite all components working, cpu looks corroded


Usually you diagnose these by process of elimination. Get down to the bare bone mobo without anything but the processor, good RAM (switch out if you can with different ones), and Power Supply. Eliminate everything else, no cd, no floppy, no hdd, no video cards, no sound cards, no cards at all really.

More than likely it's a bad power supply. Take the power supply to your local computer shop and they should test it for you for free... don't let them charge you for it. If it's good then test the cpu.

Hope this helps :)

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The cooling fan is probably not working. Unit will overheat. Check the fan to see if it run continuously with no scraping noise with the UPS turned "ON". If the fan does not run, open the case and replace the fan.

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Brand new apc 900 ups and when plugged in it after a while will beep loudly & overload button will flash..

I bought an APC 900XS UPS for $10.00. at a garage sale. I know you’re going to tell me that you take a gamble at a garage sale whether it works or not.
Please do not try to fix the device unless you are qualified electronic technician. There is high voltage and high current that is very deadly.
Before plugging the UPS in I opened the battery compartment and found the positive lead off of the battery. Took the batteries out and measured the voltage on both batteries and I couldn’t believe it, they were both good. Well at least they measured the right voltage. There are two batteries, each one is 12vdc. The real test would be to put the batteries under a load.
I plugged it in and ran for about six hours than the "Overload" LED and alarm turned on. I didn't have anything plugged into it "AC". When I first plugged it in, in the beginning I noticed the fan was running by the sound of it. But later that evening about an hour after plugging it in the fan was off. Don’t know why unless there is a temperature monitoring circuit on that heat sink and the fan wasn’t needed? After opening the unit I found a component unsoldered at one end. It looks like a capacitor or a spark gap component across the AC line. I don’t think that’s original problem. Re-soldered the component back in place. Took the board completely out and unplugged all the connectors. Again, after talking the PCB out. I didn’t see anything damage / burned. Without a schematic diagram one really can’t troubleshoot. I did noticed that (small) fan was kind-a hard to move by hand. I applied an external 24 volts to the fan. It was almost drawing 0.120 amps. The fan is rated at 0.070 amps. Took the fan apart and applied Tri-Flow (oil) to both bearings. Now the current draw has lowered. I’m wondering if the PCB has a current monitor of the fan driver, if the fan is/or requiring too much current that the unit shuts down. That heat sink that the fan is on seems to not dissipate very much heat, if any. It seems the fan is an over kill. There is a temperatures sensor mounted to the heat sink, probably to monitor the temperature of the heat sink in case the fan stops. Temporally connected everything back together. Now it’s running fine, but time will tell whether it’s going to stay running. After running four hours without any alarms, I re-assembled the unit. It’s been two days and the fan is still running and without any alarms. I haven’t plugged the computer into it yet.

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If the unit works ok on mains power, then it is the usually the batteries causing this, New battery i think you need.

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Overtemp Condition on LCD

You're absolutely right, overtemp on batteries can greatly escalate the failure of batteries, particularly older or heavily loaded ones. The fans are a fairly easy replace, if we can assist in any way, please do not hesistate to contact us.

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Liebert UPStation GXT700MT fan runs continously...

it is probably speed regulated, high temp speeds up fan. then low speed or off when not hot.if it does not run at all, fan or sensor defective. hope this helps you, good luck! glen. and it would be ok if it did run all the time, as it is better than not at all.

Feb 13, 2009 | Liebert UPStation GXT700MT (GXT700MT-120B)...

1 Answer

Use of computer ups for lighting purpose


To your concern of using a computer type UPS to power other devices:
  • If the light is incandescent type, yes;
  • If the light is florescent type, depends on the design. Some yes, some no. If the ballast is electronic, yes; if the ballast is inductive, no;
  • on the fan, no.
To my knowledge, most low-end commercial UPS produces a square wave. Only high end (expensive) models produces true Sine wave.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Aug 17, 2008 | Computers & Internet

2 Answers

50Hz to 60Hz conversion

Hi, Your idea is basically sound and should work as long as the UPS originally is designed to produce 240V 60Hz and has its own built in timebase. The reason is that the input as long as the voltage matches makes no difference (50 or 60 Hz). By design, the UPS converts the input voltage to DC to charge the internal battery. The battery then powers an electronic circuitry that produces the 240V 60Hz. The input is then isolated from the output in terms of frequency. This is a common design, however, there are some (not many) that uses for its local oscillation sampling from the source and therefore will replicate the input frequency to its output, but very rare; it's better that you know they exist. Hope this be of some help/idea. Post back how things turn up or should you need further information. Good luck and kind regards. P.S. The only problem with 50 and 60 Hz is heat buildup which is tolerable and still within safe parameters. The only time the 50/60 HZ makes a big difference is when motors are used, timers such as in the early designs of microwave ovens, washing machines, etc., pumps and other highly inductive consumers. Most electronic devices converts the AC input to DC and therefore the frequency has negligible effect. Of course others may see it differently.

Sep 15, 2007 | Liebert UPStation GXT2700RT-208...

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