Manoj Sharma
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- Jun 25, 2014
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My ups is not switching from battery to main supply.
when there is main supply it works fine.
but then it doesn't switches from mains to battery in case if main supply fails.
If i switch off the mains and power it on it works fine on battery.
but when the main supply is turned on while the ups is running on battery the mosfet(p80nf55-08) burns out quickly.
the ups is driven by pic 16f72 that drives 4 relays(each 250v 5A) by uln2003apg. also there is one lm380n opamp.
i think any one relay is dead. but i'm not sure.
please help!
when there is main supply it works fine.
but then it doesn't switches from mains to battery in case if main supply fails.
If i switch off the mains and power it on it works fine on battery.
but when the main supply is turned on while the ups is running on battery the mosfet(p80nf55-08) burns out quickly.
the ups is driven by pic 16f72 that drives 4 relays(each 250v 5A) by uln2003apg. also there is one lm380n opamp.
i think any one relay is dead. but i'm not sure.
please help!