Use the float switch to control the coil of the AC contactor, and the AC contactor can control the submersible pump to work. When the water level is too low, the float switch turns on the contact after the float drops, and the control voltage is determined by the working voltage of the selected AC contactor coil to turn on 220 V. In this way, when the water level is low and the floating ball drops to a certain height, the contact is turned on to start the water pump, and when the water level rises, the floating ball contact is disconnected from the AC contactor, and the pump is automatically stopped. The manual button is connected in the control loop of the coil.
Extended data:
Working process analysis of automatic control circuit of electric contact pressure gauge;
1, manual control:
Put the selector switch SA in the manual position, and its contact (1-3) is closed. When starting, press the start button SB2, its normally open contact (5-7) will be closed, the power supply of the KM coil loop of AC contactor will be turned on, the KM coil will be electrically attracted, the KM auxiliary normally open contact (5-7) will be closed and self-locked, and the KM three-phase main contact will be closed, and the water pump motor will be electrically started to run, driving the water pump to pump water.
2, automatic control:
Put the selector switch SA in the automatic position, and its contact (1 1) is closed. When the pressure of the electric contact pressure gauge is lower than the lower limit, the SP contact (7- 1 1) is closed, so that the KM coil of the AC contactor is attracted by electricity, the KM auxiliary normally open contact (7 1) is closed, and the self-locking KM three-phase main contact is closed, and the electricity of the water pump motor starts to operate, driving the water pump to pump water.
With the gradual increase of pressure, when the pressure is greater than the upper limit of SP, the SP contact (113) is closed, the power supply of KA coil loop of intermediate relay is turned on, KA normally closed contact (7-9) is turned off, the power supply of KM coil loop of AC contactor is turned off, the KM coil is released, the KM three-phase main contact is turned off, the water pump motor stops running, and the water pump is turned off.