Power outage call alarm circuit

 Some important workplaces often use backup generators to generate electricity to meet power needs during power outages, such as in movie theaters, hotels and other places.
When the power grid resumes power supply, it is hoped that the backup generator can be stopped quickly to avoid unnecessary waste. As shown in the picture is one.
Simple power outage and incoming call alarms can conveniently notify you of power outages and incoming calls.
    When the power supply is normal, the neon tube N is energized and emits light, and the relay KA is closed. At this time, the switch S is placed in the Sl position. The buzzer CN and the light bulb
EL cannot receive power to alarm. When the power grid loses voltage. KA is released. At this time, the power supply line of the sounder in the line is connected, and a power outage alarm is issued, so that
the personnel on duty can start the backup generator in time. After starting the machine, turn the switch S to the S2 position to prepare for the incoming alarm. When a call comes, the alarm will send
out an incoming call alarm signal to inform the staff of the incoming call from the power grid, so that the generator can be stopped in time and the power supply can be switched to the power grid. At the same time, set the switch S
to the S1 position to stop the alarm signal and prepare for the next power outage monitoring.