Double constant pressure water supply system without tower based on PLC and soft starter and variable voltage variable frequency inverter

SUN Li-shu
(Department of Engineering, Zhejiang Dongfang Vocational Technical College, Wenzhou 325011, China)

Abstract: Aiming at the problem of short life of the motor on the traditional two-constant pressure water supply system without the tower, a new two-constant pressure water supply system without the tower was designed. Programmable logic controller(PLC), soft starter and frequency control technology was used in the new two-constant pressure water supply system, so the smooth start will take place. Because there is no impact on the motor, the motor life was extended. The result shows that there will be more energy efficiency in the new water supply system than traditional water supply system, energy-saving rate of 17% or more, and also excellent water quality and water supply reliability.
Key words: programmable logic controller(PLC); soft starter; variable voltage variable frequency inverter; double constant pressure; no tower;  water supply system