1. When the water pump is installed

1. When the water pump is installed, overhauled, debugged or the pressure sensor is not working properly, manual control can be used to control the start and stop of the water pump.2. When the system is normal, this control method can automatically complete all operations of soft start, stop, and switchover of the two pumps according to the change of water consumption.3. In order to prevent the water level in the reservoir from overflowing when the user's water volume is very small (for example, at night), the system uses a float-type liquid level switch liquid level detection device installed on the upper part of the reservoir to increase the water level of the reservoir. The signal is transmitted to the PLC control, and a sound and light alarm signal is issued.4. When the inverter is overloaded, the inverter will automatically stop output to protect the inverter and water pump, and send a stop output signal to the PLC control to send out an alarm signal.5. When the grid voltage is too high, an overvoltage protection device (model: DJ-131, KV in Figure 10) on the main circuit is installed to output an overvoltage signal to the PLC control, and the PLC sends an output stop signal to trip the power circuit breaker, To protect the inverter and water pump.