48 V Low voltage alarm circuit for Battery rectifier / charge

Hello there,

It is requested to please help me design a circuit for 48 volts rectifier/charger to operate a buzzer on its failure, with a variable to adjust the dropout voltage. Circuit should mark the relay and sound the buzzer as soon as the charger voltage drops to 47 or 46 volts and it should unmark the relay and stops the sounding relay as soon as the voltage returns to 48 volts.

I know it is not a complex one, but help in this regard is very much appreciable.

Thanks,

nadia
EE

Use a 45v zener diode, 1k resistor, transistor and 5v buzzer with a limiting resistor.

can you please provide a raw circuit diagram please?

Here is the circuit

it is such a great help, i m very greatfull.
I'll let u know when i replicate it on hardware.

cheers