1. When the water pump is installed, repaired and debugged or the pressure sensor cannot work normally, the start and stop of the water pump can be controlled by manual control.<br>2. When the system is normal, the control mode can automatically complete the soft start, stop and switch of the two pumps according to the change of water consumption.<br>3. In order to prevent the water level in the reservoir from overflowing when the water level in the reservoir is too high when the user's water volume is very small (such as at night), the system transmits the high water level signal of the reservoir to the PLC control through the float type liquid level switch liquid level detection device installed on the upper part of the reservoir, and sends out the sound and light alarm signal.<br>4. When the frequency converter is overloaded, the inverter will stop the output automatically to protect the frequency converter and water pump, and send the stop output signal to the PLC control to send the alarm signal.<br>5. When the grid voltage is too high, the overvoltage protection device (model: dj-131, kV in Figure 10) on the main circuit is installed to output the over-voltage signal to the PLC control, and the PLC sends the output stop signal to trip the power circuit breaker to protect the frequency converter and water pump.<br>
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