Question about Electrical Supplies
You state that you are using a UK / US adapter to plug in the UPS. Since the UPS is expecting 220vac, as nameplate states, it will also deliver 220vac on the output from battery power. The UPS may also have a universal power supply on the input so that batteries can charge at a lower voltage, and also allow the UPS to augment "dirty power" by using the batteries for extended service, rather than use the batteries alone.
From your description, the UPS is still making 220vac @ 50Hz, but the use of an adapter leads me to think that you are using devices that are intended for perhaps 120vac @ 60Hz. Wrong Voltage, Wrong Frequency.
Posted on Sep 10, 2010
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Posted on Jan 02, 2017
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