Solution

         Typhoon Danas, with its unusually 180° turn and serpentine path, made landfall in my country three times, affecting many southern provinces and bringing extreme weather such as heavy rainfall and strong winds. This type of weather can easily disrupt critical infrastructure in cities, such as power and water supplies. To ensure the needs of the people and the normal operation of the social economy, both water supply companies and power grid companies deploy strict protective measures in advance and quickly organize emergency repairs after the disaster

Once the municipal water supply is restored, residential communities, factories, shopping malls, and other similar establishments typically rely on constant pressure water supply systems to maintain stable operation. These systems, with pressure sensors, PLCs (Programmable Logic Controllers), bus I/O modules, and frequency converters as their core control devices, continuously ensure a constant water pressure. Compared to traditional water supply methods, factory constant pressure water supply systems offer advantages such as advanced technology, stable water pressure, ease of operation, reliable performance, high degree of automation, and significant energy savings

Constant pressure water supply system principle

    A constant pressure water supply system is a closed-loop automatic control process that ensures the network pressure remains stable at the set value by monitoring water pressure in real time and dynamically adjusting the pump speed

Real-time monitoring: Pressure sensors continuously collect the actual water pressure of the water supply network

Intelligent calculation: The PLC receives sensor data, compares it with the set pressure value, and then performs PID calculation to determine the required motor speed adjustment

Precise speed control: The PLC outputs control signals to the frequency converter, which dynamically adjusts the frequency and voltage of the output power supply

Constant pressure output: The frequency converter drives the main water pump motor to operate at different speeds as needed, thereby maintaining a constant water pressure in the pipeline network

Solution

This factory's constant pressure water supply system uses Huamao Auto 800 series IO modules instead of the traditional Siemens solution, significantly reducing hardware costs while optimizing on-site cabling efficiency through a distributed architecture. This series of modules offers rich expansion capabilities:

Digital input (DI): Real-time acquisition of inverter operating status (such as start/stop signals);

Digital output (DO): Drives indicator lights on equipment and inverter start/stop commands;

Analog Input (AI): Acquires pressure sensor data and transmits it to the PLC;

Analog Output (AO): Receives PLC commands and dynamically adjusts the inverter's output frequency

Huamao's bus I/O modules, with their high cost-effectiveness and flexible configuration, have become a key support for the stable operation of constant pressure water supply systems