Reasons
1) A heavy non linear load is connected to the output (Like Fans, pumps, etc)
It is advised not to connective heavy inductive loads to the UPS(see the manuals)
2) The transformer may have gone bad.(Needs to give the output transformer for lamination / servicing). Please verify if the transformer is getting heavily heated up.
3) The UPS micro circuits / microcontroller controlling the bridges that feed the transformer have some issues.
4) The UPS switching section might not be working properly. When the mains fails the UPS will go to inverter mode, when the mains restores the ups returns to the mains mode while the inverter side is still ON (This issue will happen to some locally designed UPS only) this causes the mains to flow back to the MOSFET through the transformer that causes the MOSFET to overload and will burn out.
5) Ensure that the heat sinking is proper and heat sink compound is is applied propely between the MOSFET and the heat sink and the MOSFET is properly fixed to the heatsink.
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