Original post by: Ravi Singh

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I had a same problem. I did an experiment. I saw that when I connected the ups to power supply via voltage stabilizer and this sound will stopped at a specific voltage ~235-240 volt.  Now I'm using a voltage stabilizer with ups. It's also start beeping at high voltage as well at low voltage but works well within the said limit. I don't know what's the exact reason. I think Something is faulty in the circuit board.

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open