STUDY ON DESIGNING THE AUTOMATIC SYSTEM CONTROLLING PUMP HEAD IN WATER SUPPLY SYSTEMS

Abstract

In a water supply system, water demand always changes over time, affecting head, flow and power of pump. This paper presents the way to design an automatic system controlling head of the pump in order to meet the requirement of water demand changing. This system is integrated several major equipment including PLC S7-200 (Programable Logic Controller), inverter MICNO-KE300, pressure sensor sensor. When water head or flow in the system changes, electrical signal from the sensors are transferred to PLC that controls the inverter to change pump speed. In such the manner, pump head will be changed to the required pre-set head value. Experimental results show that the designed system realized tracking to preset head value with error within permitted. A cost-benefit analysis was also conducted in the case of head to be reduced about 20% compared to the identification value showing that energy can be saved up to 34%.