New Rural Water Supply

= **1.Industrial Background** =

With the deepening of my country's new rural construction and the full implementation of the rural revitalization strategy, rural water supply systems are facing the need to transform and upgrade from "having water to drink" to "drinking good water". In this context, frequency conversion technology, as a mature power electronics control method, is becoming a key technical solution to solving the rural water supply problem with its excellent energy-saving characteristics, efficient operation performance and stable water supply capacity.

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= **2. Production Requirements** =

Control Requirements

A.The system should be equipped with a pressure sensor to monitor the pipe pressure in real time. The control system adjusts the output frequency of the VFD according to the preset pressure range (such as 0.4-0.6MPa) through the PID algorithm to control the speed of the water pump and achieve constant water supply pressure.

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B. Multiple pumps are linked and switched, and the operating status of the water pumps is automatically switched according to changes in water consumption to maintain stable water supply pressure.

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C. Energy saving and protection. The VFD should have an energy-saving function and be able to adjust the speed of the water pump according to actual needs. The system should be equipped with overcurrent, overvoltage, undervoltage, overheating and other protection measures to ensure the safe operation of the water pump and VFD.

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D. Automation and remote monitoring control system. It can automatically start and stop the water pump, and view water supply pressure, water pump status, energy consumption and other information in real time through the centralized control display and APP. It also has an alarm function.

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= **3.Wiring Diagram** =

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[[image:New Rural Water Supply 25090502.png]]

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= **4.Parameter Settings** =

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|Parameter|Description|Set Value|Remarks

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|F0.01|Start/Stop Command Source|1|DI Terminal

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|F0.03|Main Frequency Source|8|PID

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|F0.18|Acceleration Time|6|According to Real Needs

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|F0.19|Deceleration Time|6|According to Real Needs

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|F9.01|PID Set Value（Set Pressure）|37.5|37.5%，refers to 6 Bar，according to real transmitter range

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|F9.28|PID Sleep Option|1|Activated

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|F2.29|PID Sleep Threshold|37.5|37.5%，refers to 6 Bar，according to real transmitter range

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|F9.31|PID Wakeup Threshold|31|31%，refers to 6 Bar，according to real transmitter range

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|F6.02|Relay1 Option|2|Error Output

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|F6.12|AO1 Feedback Option|0|Running Frequency

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|FC.00|RS485 Communication Address|1/2/3|For Upper Device Reading

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= **5.Solution Features** =

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1) Energy saving and consumption reduction, lowering operating costs.

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Demand-based pump speed adjustment: Automatically adjusts motor speed based on actual water consumption, avoiding the "big horse pulling a small cart" phenomenon during power-frequency operation and reducing energy waste.

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2) Stabilizes water pressure and improves water supply quality.

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Constant pressure water supply: Using real-time feedback from pressure sensors, pump output is dynamically adjusted to maintain constant pressure in the pipeline network and avoid water pressure fluctuations (such as insufficient pressure during peak usage and excessive pressure at night). Reduced water hammer: The soft start/stop function allows for gradual acceleration and deceleration, preventing sudden pressure spikes in the pipeline and protecting the pipeline network and equipment.

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3）Extend equipment life and reduce maintenance costs.

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Reduced mechanical shock: Motor starting current is reduced from 6-7 times the power frequency to less than 1.5 times, minimizing impact on the power grid and pump.

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Reduced wear: When the pump operates at low speed, wear on mechanical components such as bearings and seals is reduced, extending equipment life.

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4）High degree of automation and convenient management.

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Intelligent control: Supports remote monitoring and fault alarms (such as water shortage protection and overload protection), reducing the frequency of manual inspections.

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Multi-pump linkage: Multiple pumps can be automatically switched or operated in parallel based on water demand, optimizing system efficiency.

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5）Adapts to Complex Environments and Improves Reliability

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Addressing Fluctuations in Water Use: Rural water use is concentrated during peak hours (such as morning and evening rush hours). The VFD can quickly respond to flow fluctuations, avoiding frequent pump starts and stops.

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Strong Compatibility: Compatible with a variety of pump types, including deep well pumps and centrifugal pumps, eliminating the need to replace existing equipment during retrofits.

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6）Water Conservation and Environmental Protection

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Reducing Pipeline Leakage: Constant-pressure water supply reduces the risk of pipe bursts caused by excessive pressure.

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= **6.Photos at Site** =

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