Process Automation: A Case of Analogue Signal Conditioning using Variable Frequency Drive Controller

This study presents the development of a process control system using variable frequency drive (VFD) as applied to water pumping and filling system. The results of the evaluations of the study showed that the use of the VFD conforms to the Affinity Laws of using centrifugal pumps whenever there were variations of pump supply frequency corresponding to the difference between process value and process set point. These variations in frequency results in variation of energy consumption of the three phase motor thus the savings as compared to constant frequency drive.