The flow rate and pressure difference of the water pump system are achieved through valve and bypass regulation, which inevitably leads to significant interception losses and phenomena of high flow rate, high pressure, and low temperature difference. This not only wastes a lot of electricity, but also causes the overall non regulation of the water pump system. To solve these problems, it is necessary to adjust the water flow rate of the pump according to changes in load and close the bypass.

The starting current of the motor is 3-4 times its rated current. A 90KW motor will have a starting current of 500A. Under such a large current impact, the service life of the contactor and motor will be greatly reduced. At the same time, mechanical impact during starting and water drop phenomenon during pump stop can easily cause damage to mechanical components, bearings, valves, pipelines, etc., thereby increasing maintenance workload and spare parts costs.

In summary, in order to save energy and costs, it is necessary to renovate the water pump system to achieve energy conservation and extend the service life of motors, contactors, mechanical components, bearings, valves, and pipelines.

The frequency converter can adjust the speed of the water pump motor according to the load changes, and make corresponding adjustments to the water pump under normal working conditions to achieve energy-saving goals. When the speed of the water pump motor decreases, the amount of electrical energy absorbed by the motor from the grid will be greatly reduced.