In the system control process, the

In the system control process, the signals that need to be detected include pipe network water pressure signals, pool water level signals and alarm signals. The water pressure signal of the pipe network reflects the water pressure value of the user’s pipe network, which is the main feedback signal for constant pressure water supply control. This signal is an analog signal and is input to the frequency converter; the water level signal of the pool reflects the high water level of the storage tank, and an alarm is issued when the water level is too high. This signal comes from the liquid level sensor installed in the pool; the alarm signal reflects whether the system is operating normally, whether the pump motor is overloaded, and whether the inverter is abnormal. This signal is a switch signal.