JIC_V4_N2_RP1 Manoj M. Kharade N.R Kulkarni Journal on Instrumentation & Control Engineering 2321 – 1148 4 2 1 6 PLC, SCADA, Induction Motor, V/F Drive, Fault Diagnosis The intent of the paper is to control the speed and give protection to Induction Motor (IM). Thereby it limits the starting current and protects the induction motor under load/ overload conditions. The control panel is designed to control the speed and protection of 3 phase IM and required control is done by PLC (Programmable Logic Controller). The motor is run at no load condition and load condition, for manual mode and PLC mode. At manual mode, if frequency is changed, the motor speed changes by keeping v/f ratio constant but, regulation in speed is high. At PLC mode, if frequency is changed, the motor speed remains constant, by keeping v/f ratio constant and speed regulation zero. The speed control of the induction motor in manual and PLC mode is accessed by using the selector switch [1]. SCADA (Supervisory Control and Data Aquisition) is used for monitoring and controlling of induction motor performance and it also collects performance data of the induction motor. This is how the starting, control the speed and protection of IM is achieved by using PLC and SCADA, and the operation is sufficiently high efficient and reliable [1], [2]. February - April 2016 Copyright © 2016 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=4876