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Tripplite 750 watt UPS

 
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pensacol



Joined: 16 Dec 2006
Posts: 2
PostPosted: Sat Dec 16, 2006 9:26 pm    Post subject: Tripplite 750 watt UPS Reply with quote
I was given a Tripplite 750 watt UPS backup. I purchased a new 26AH battery for it. The problem I am having is when it is on line power it outputs 120 volts, but when it switches to battery is outputs 160 volts. I know this isn't right, but cannot find out why it is doing this. Maybe a bad diode?
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rashideng
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PostPosted: Wed Mar 26, 2008 6:28 am    Post subject: ups Reply with quote
Dear Sir,

please mail me circuit diagram 5000w ups online.





Thanks
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden
PostPosted: Wed Mar 26, 2008 10:15 am    Post subject: Re: Tripplite 750 watt UPS Reply with quote
pensacol wrote:
I was given a Tripplite 750 watt UPS backup. I purchased a new 26AH battery for it. The problem I am having is when it is on line power it outputs 120 volts, but when it switches to battery is outputs 160 volts. I know this isn't right, but cannot find out why it is doing this. Maybe a bad diode?


A cheap UPS usually does not deliver a sine wave output, instead it uses a square wave or staircase wave. A simple multimeter can not measure AC voltages with such waveforms correctly, instead you should use an oscilloscope and make sure that the peak-to-peak value of the output voltage is within ± 20 % of the desired value (339 V p-p for a 120 V rms mains voltage).

Remember that if the UPS supplies a square wave, then you should ONLY use it for switch-mode power supplies (like PC computers, reasonably modern monitors etc). You should NOT connect a power supply with a conventional mains transformer (small wall plug adapters etc) to it, as the square wave will cause saturation and overheating of the transformer core.
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