1.Situation:

As a general machinery for industry, agriculture and life, water pump has large and wide application, and the power consumption of its supporting motor is also huge. According to statistics, the total installed capacity of motors in China is 450 million KW, the total installed capacity of fans and pumps is 150 million KW, and the power consumption can be more than 20% of the national total power generation. Due to the capacity and process, the system adjustment method is relatively backward. Most fans and pumps are regulated by mechanical shut-off methods, so the use efficiency is low. More than half of the fans and pumps have different levels of wasted electrical energy. Today, under tension, reducing waste and saving electricity are the top priorities.

2.Traditional Water Supply Disadvantages

a.Cost High

The total invest is high for building water pool and installing water tank.

b.Secondary pollution of water

The water stored in the water pool or water tank for long time will lead to secondary pollution of water.

c.Serious energy waste

Traditional water supply system used throttle to adjust the water supply which will lead to energy waste.

d.Water waste

Water leakage frequently occurs in traditional water supply and water pool and water tank need to clean frequently .

3.Advantages of constant pressure water supply with VFD

a. Easy to install and use, power saving rate can be as high as 20% (Normally 20% to 40%).

b.Soft start and stop, avoids strong current and mechanical shock, effectively extend the service life of equipment.

c.Over-voltage, under-voltage, overload and other automatic protection functions to prevent accidental damage to equipment.

d.Manual and automatic energy saving switchover function to ensure the normal operation of the equipment.

e.High power factor output, reduce reactive power loss and compensation capacity, reduce motor heating, extra loss and noise.

f.Improve equipment operating conditions, reduce mechanical wear and repair, maintenance personnel expenses.

g. With RS485 communication interface function, it can realize the network operation and monitoring functions of the energy-saving system.

4.What’s kind of pump applications that need variable frequency drive?

a.Waterworks and booster pump house

b.Residential areas, hotels and other buildings

c.Enterprise production water

e.Boiler circulating water system

d.Farmland irrigation system