Badcaps Forums - View Single Post - Need tips in fixing APC 1500VA UPS having buzzing noise

**Toasty** · 08-03-2012, 10:14 PM

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.

T

08-03-2012, 10:14 PM	#13
Toasty Badcaps Veteran Join Date: Jul 2007 City & State: East Coast, USA Line Voltage: 220-221 I'm a: Professional Tech Posts: 4,145	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. T __________________ veritas odium parit