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Old 08-03-2012, 10:14 PM   #13
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Join Date: Jul 2007
City & State: East Coast, USA
Line Voltage: 220-221
I'm a: Professional Tech
Posts: 4,145
Default Re: Need tips in fixing APC 1500VA UPS having buzzing noise

The title says 220vac, you're looking for 250vac. The capacitance is fine.

It's -only- a 12% difference in voltage, and for a trial to see if the noise stops, it's worth it. I would not leave it in place permanently.

Sealed caps like these are generally fine for a long time on the shelf. I would apply voltage slowly to make sure it is stable. A lamp in series with the power line. Or, try just feeding the cap through a lamp externally by itself, before installation. That would be a safer way, in case it decides to go *bang*!

If the lamp goes bright and stays that way, the cap is shorted.

Caution is advised.

veritas odium parit
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