Application of HD31 in constant pressure water supply system
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  • Application of HD31 in constant pressure water supply system

Application of HD31 in constant pressure water supply system

Traditional water supply solutions not only have high initial investment costs, but also high maintenance costs and labor inputs. In addition, the water supply pressure is unstable, power consumption is high, and water resources are wasted quite seriously. With the continuous development of society and the huge consumption of natural resources by humans, energy saving and water saving have become urgent needs of society. Therefore, a new water supply solution is imperative. In recent years, the constant pressure water supply solution realized through frequency converters is very good. It solves the problems caused by traditional water supply solutions and believes that this solution will become the development trend of the water supply industry.

Classification :


1 Introduction
Traditional water supply solutions not only have high initial investment costs, but also high maintenance costs and labor inputs. In addition, the water supply pressure is unstable, power consumption is high, and water resources are wasted quite seriously.

With the continuous development of society and the huge consumption of natural resources by human beings, energy conservation and water conservation have become urgent needs of society, so a new water supply solution is inevitable It must be done. In recent years, the constant pressure water supply solution implemented through frequency converters has solved the problems caused by traditional water supply solutions. It is believed that this solution will become the development trend of the water supply industry.

2 Traditional water supply system
1. Water supply system with a single constant speed pump

Water supply method: the water pump directly inputs water from the reservoir into the water supply pipe network, and the water pump runs at a constant speed from the beginning of the system to the end of the water supply;

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Advantages: simple system and low cost;

Disadvantages: unstable pipe network pressure, large energy consumption, and large waste of water resources.

2. Water supply system for fixed speed pump and water tower

Water supply method: The water pump inputs water into the water tower, and then the water tower supplies water to the pipe network. When the water level in the water tower is lower than a certain position, the water pump starts to work, and when the water level is lower than a certain position, the water pump stops working;

Advantages: Compared with the previous water supply method, the water supply pressure is relatively constant and the energy consumption is relatively small;

Disadvantages: large equipment investment, large floor space, unadjustable water pressure, frequent starting and stopping of the water pump, which causes large losses to the equipment.

3. Water supply system with constant speed pump and air pressure tank

Water supply method: The water pump inputs water into the air pressure tank, and then the air pressure tank supplies water to the pipe network. When the air pressure in the air pressure tank is lower than a certain pressure, the water pump starts to work; when the air pressure in the air pressure tank is higher than a certain pressure, the water pump stops working;

Advantages: lower cost than water tower method;

Disadvantages: Frequent starting and stopping of the water pump causes large equipment losses and high energy consumption.

3 HD31 Technical Features
HD31 inverter uses advanced customized design concepts, focuses on the needs of the water supply industry, and perfectly combines advanced motor control technology with constant pressure water supply control logic; rich water supply control logic functions, super overload capacity, and complete fault protection. It can meet the energy-saving transformation and application of various water supply systems.

3.1 Rich water supply control logic functions
(1) 2 water supply modes

The constant pressure water supply debugging mode is mainly used to detect the motor wiring and the wiring of the inverter output terminal;

Constant pressure water supply operation mode is the mode that must be selected when running constant pressure water supply.

(2) Water level detection function

Water level detection includes 3 modes: no water level signal is detected, input by switch input terminal, input by analog input terminal. The water level detection function mainly monitors the water level of the reservoir and takes different water supply measures according to different situations. When the water level drops, when the water level drops to the lower limit water level, the system operates according to the backup set pressure. If the water level drops to the water shortage level, the system will stop all currently running pumps; when the water level rises, when the water level rises to the lower limit water level, the system restarts. Start the water pump to start supplying water and supply water according to the backup pressure at this time. If the water level rises to the upper limit water level, the system will supply water according to the normal pressure.

(3) Water pump rotation function

The water pump rotation function is to solve the problem of some water pumps being shut down for a long time and even rusting when the water supply system has stable water supply pressure for a long time.

(4) Sleep function

The sleep function occurs when the current water supply system detects that the water supply pipe network pressure has been exceeding the expected set pressure, and at this time the variable frequency water pump is still at the lower limit frequency. It will be in zero-frequency output state. If it sleeps at this time, it will save electric energy. When the pressure of the pipe network drops, the system will wake up again and continue to supply water.

(5) Setting water supply pressure for multiple periods

Multi-time setting pressure water supply is suitable for domestic water supply in residential areas, where water consumption varies significantly in different time periods.

(6) PID function

For the set pressure signal input to the water supply system and the feedback pipe network pressure signal, the PID adjustment characteristics are used to make the system's pipe network pressure eventually tend to the set pressure.

3.2 Super overload capability
150% rated output current for 2 minutes;

180% rated output current for 10 seconds;

3.3 Complete fault protection

When the frequency converter reports a fault, the water supply system will handle it according to the preset processing method. The system includes two processing methods, one is to directly stop all water pumps in the water supply system if the frequency converter reports a fault, and the other is to switch to the next variable frequency pump to run when the frequency converter reports a fault.

4 Application cases of constant pressure water supply
4.1 Site conditions and wiring
Three asynchronous motors, a remote pressure gauge with a DC0-10V range of 1Mpa, a potentiometer with a 0-10v range, and a liquid level sensor are used on site. The desired pipe network pressure is set by the potentiometer signal and the remote pressure gauge signal Feedback to HD31 the actual pressure of the current pipe network, and the liquid level sensor monitors the current water volume information in the reservoir. HD31 determines whether the current system should continue pumping water from the reservoir through the information sent back by the liquid level sensor. When the water in the reservoir is sufficient, HD31 uses the built-in PID function to calculate the potentiometer signal and the remote pressure gauge signal to achieve the desired pipe network pressure. The wiring is shown in Figure 1:

 

 

 

1.1 Debugging process
(1) Wiring according to Figure 1 above;

(2) Enable water supply expansion function and enable water supply expansion card;

(3) Set the rated current of water pump 1 according to the motor nameplate;

(4) Set the command given channel;

(5) Set acceleration and deceleration time, analog function, terminal function;

(6) Adjust the two analog signals and adjust the PID parameters according to the actual performance.

1.2 Parameter Settings

 


1.3 Debugging effect
After setting the expected pipe network pressure, start the constant pressure water supply system. Through the built-in PID function of HD31, water pump 1 is quickly adjusted from 0Hz to the PID upper limit frequency operation. At this time, the expected pipe network pressure has not been reached. After the pump detection time is exceeded, the frequency is converted. The device immediately reduces the PID upper and lower frequency to the lower limit frequency according to the preset deceleration time. At the same time, the water pump 2 is put into use in the power frequency mode, and then the water pump 1 runs again according to the frequency adjusted by the PID. At this time, observe the feedback from the remote pressure gauge. The signal is basically stable within our preset pipe network pressure range.

5 Conclusion
A variety of pressure setting methods meet the needs of various project implementations. The advanced PID adjustment function ensures the stability of the pipe network pressure. The water level control function ensures that the water supply is suspended when the water volume of the reservoir is insufficient. On the one hand, it saves energy and on the other hand, it reduces the energy consumption. It reduces mechanical losses and the sleep control function ensures that all water pumps are shut down to save energy when the pressure in the pipe network continues to be too high. Actual use shows that HD31 can achieve constant pressure water supply very well. Its excellent motor performance, rich control functions, and stable and reliable performance have finally won the recognition of customers. HD31 will continue to make due contributions to energy conservation and emission reduction in the water supply industry. .

Traditional water supply solutions not only have high initial investment costs, but also high subsequent maintenance costs and labor inputs. In addition, the water supply pressure is unstable and consumes a lot of electricity. , the waste of water resources is also quite serious. With the continuous development of society and the huge consumption of natural resources by humans, energy saving and water saving have become urgent needs of society. Therefore, a new water supply solution is imperative. In recent years, the constant pressure water supply solution realized through frequency converters is very good. It solves the problems caused by traditional water supply solutions and believes that this solution will become the development trend of the water supply industry.

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