It maybe an SMPS based UPS. Switching power supplies do not function properly without a minimum load, eg, problems in feedback loop, inductor, etc without minimum load. So, the UPS may turn itself off to protect itself.
Nalin74,
Some photos would help. Then, it can be better understood.
@Nalin74 ,
please post the images..it will help us for better understanding the circuit elements you mentioned.
Here are the photos. In one I have showed the out put connections & from it getting a sample with two resistors. A & B
These both values is about 1.2 M Ohm for one out put. I have disconnected the path & tried with various values, but none of them cannot hold the out put.
Within 2 sec UPS goes off & RED LED with BEEP coming.
I think this is the point for no load sampling. But there is another TAP from the out put. I have showed in the other photo. That is a Ferrite T/F & getting some portion of voltage & doing something. see the X point. I think that is for the overload detection may be.
Because this UPS has a function of both Normal & UPS modes overload protection.
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