Junior Member level 1
Pls I need a circuit that will automatically switch over to generator and back to electricity mains when there is supply with alarm. Also considering when there's low voltage from mains
Why complication while the same function can be achieved just by relays? In case of low voltage you'll have to start the generator first and not Shifting the load to the generator. Why one will sit in the dark unless the generator is activated at the same time. This circuit shown below is commercially used for changeover.
here is a simple circuit for ur requirement. single Phase, adjustable low voltage cut out, LED and Buzz for main voltage. need more advancement requirement or any help?
Thank you Frank for the flow chart. In simple the circuit given by me is typical Indian design. (Keep it cheap and simple). In addition to that it also has a 12 volt 500 Ma transformor driving a 12 volt SPDT relay which is energised when the power resumes to switch off the engine. No timers are used. But your idea is excellent and advanced with which one can design a complete changeover system.I was going to mention that. sequence is :- 1. mains fails(goes low) 2. generator starts 3. generator volts stable for 5 seconds. 4. change over to generator. 5. mains returns and is stable for 10 seconds. 6 change over to mains. 7. generator runs for 10 minutes for cooling system and alternator cooling to cool things down then generator switches off. Frank