Inverter Ad Access Training: Today we will be building automatic changeover that can OFF and also ON your generator automatically.

We also included manual switches that can be used to OFF and ON generator manually

 Inverter Ad Access Training: First, let's see the diagram of the automatic changeover that can OFF and ON generator.

 Inverter Ad Access Training: Looking at this diagram, you will see that this automatic changeover is a single phase automatic changeover.

 Inverter Ad Access Training: You will see that two wires from the generator switch is connected to normally open terminals of a switch and normally open terminals of contactor 1 (K1) to off the generator.

Two wires from the solenoid starter of the generator is connected to Normally close terminals of the switch, and the normally close terminals of the contactor 1 ( K1 ) to start the generator.

 Inverter Ad Access Training: Things to know about this kind of automatic changeover.

Inverter Ad Access Training: Two contactors and one 8 - pin relay are used for this automatic changeover.

Inverter Ad Access Training: Terminals 13 and 14 of  contactor 1 ( K1 ) is  normally open (NO)

 Inverter Ad Access Training: Terminals 21 and 22 of  contactor 1 ( K1 ) is  normally closed (NC).

Inverter Ad Access Training: Terminals 2 & 10 are input supply terminals of the pin relay ( coil terminals of pin relay).

Pin 6 of the pin relay is one of the common terminals of pin relay and its normally open to terminal 7.

Terminal 11of the pin relay is another common terminal of the pin relay, and its normally closed to terminal 8.

 Inverter Ad Access Training: Okay, let's see the step by step procedure of building building this automatic changeover from the scratch.

 Inverter Ad Access Training: STEP BY STEP PROCEDURE

Inverter Ad Access Training: 1.   Connect the live wire and the neutral  wire of the utility power supply ( PHCN ) to the terminals L1 & L2 of the contactor 1 ( K1 ) respectively

Inverter Ad Access Training: 2.  Connect a wire from terminal L2 of the contactor 1 ( N ) to terminal A2 of the contactor 1 coil ( K1 ). Inverter Ad Access Training: 3. Connect wires from L1 & L2 of the contactor 1, to the input terminals of the pin relay ( say 2 & 10 ) respectively.

( Connect live wire to terminal 2 and neutral wire to terminal 10 of the pin relay)

 Inverter Ad Access Training: 4.  Connect wire from terminal  2 of the pin relay ,  to terminal 6 of the same pin relay ( terminal 6 is one of the common terminals of the pin relay, and its Normally open with terminal number 7 )

 Inverter Ad Access Training: 5.  Connect terminal 7 o the pin relay to terminal A1 of the contactor 1 ( K1 ).

 Inverter Ad Access Training: 6.  Connect the live and the neutral wires of the generator supply to the terminals L1 & L2 of the contactor 2 ( K2 ) respectively.

( connect the live wire to L1 and the neutral wire to L2 ).

Inverter Ad Access Training: 7.  Connect terminal L3 of the contactor 2 ( K2 ) to terminal 11 of the pin relay.

Inverter Ad Access Training: 8.  Connect terminal 8 of the pin relay to terminal A1 of the contactor 2 ( K2 ) Inverter Ad Access Training: 9.  Connect terminal 8 of the pin relay to the terminal A1 of the contactor 2 ( K2 )

Inverter Ad Access Training: 10.  Connect terminal T1 of the contactor 1 ( K1 ) to terminal T1 of the contactor 2 ( K2 ).

Inverter Ad Access Training: 11.  Connect terminal T2 of the contactor 1 (K1) to terminal T2 of the contactor 2 (K2).

Inverter Ad Access Training: 12.  Connect the live and neutral supply wires of your house to terminals T1 and T2 of any of the two contactors respectively.

Inverter Ad Access Training: 13.  Connect the two wires of your generator switch to terminals 13 & 14 of the contactor 1 ( K1 ) respectively.

( This is for automatic offing of the generator). 

Connect the same wires of your generator switch to terminals 3 & 4 of the switch. ( this is for manual offing of the generator.Inverter Ad Access Training: 14.  Connect the Utility indicator lamp to terminals A1 and A2 of contactor 1 ( K1 ).

Connect the generator indicator lamp to A1 and A2 terminals of contactor 2 ( K2 ).

Connect the load indicator lamp to terminals T1 And T2 of any of the two contactor's.

Inverter Ad Access Training: 15.  Connect one of the solenoid starter wires from your generator  to terminals 22 of the contactor 1 ( K1 ).

Connect the second wire of solenoid starter to terminal 1 of the selector switch, connect the terminal 2 of the switch to terminal 21 of the contactor 1 ( K1 ).

( This is for automatic  as well as for manual starting  of the generator)