Auto Changeover from Inverter / Generator to Mains Supply

Below is the Inverter & mains change over circuit, in this circuit  both Inverter supply & mains supply combined which is called UPS , for this purpose  8 pin DPDT relay (220 V ) were used as explain in the diagram ,

Blue wires are for Inverter ON & OFF switch, in absence of MAINS supply Inverter will be in ON condition (pin 1 connected to 4), as can be see in diagram, 

One of the wire from mains, Inverter & output are kept common,

Pin # 8 is common for 5 & 6 pin, where main connected to pin 6 & Inverter to pin 5.

Green wires to pins 2 & 7 are relay energizing points, where both wires are connected to the mains,

In absence of mains Inverter will be in on condition due to pin 1 & 4 connected, supply from Inverter

Will be available due to pins 5 & 8 connected each other,

In the other hand if  mains supply came relay will be energize due to pins 2 & 7 , pins 6 will connect to 8,

Pin 1 will be disconnected from 4, Inverter will be off.

You use generator instead of Inverter but the Technic is same

Keep in mind that one wire from  mains supply , invertor & output must common 

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