MONITORING AND CONTROL OF THREE PHASE SERVODRIVE USING PLC AND SCADA

Abstract

The present work involves the study, development and implementation of a semi-automated system using a Programmable Logic controller for the control and monitoring of a Three phase Servodrive (Permanent Magnet Synchronous Motor drive). Three Phase Servodrives using PMSM are increasingly used for precision control applications in process industries due to their high torque to inertia ratio and operation at higher power factor as compared to Induction Motor. Most of the earlier research on PMSM focused on performance improvement through the use of advance control algorithms such as Vector control, sensorless control, direct torque control, etc. However modern industrial processes which involve multimotor drives require a co-ordinated sequential control through PLC and SCADA system. So far there has been very limited work on the PLC-SCADA control of a PMSM. The present work is an effort to explore this aspect of the PMSM control. An integrated system comprising of a Workstation (PC), the PLC(GE-Fanuc), Permanent Magnet AC Servo Drive, three phase Servomotor(PMSM) and the software for Supervisory Control and Data Acquisition system are configured and developed in co-ordination with each other to ultimately control the three phase Permanent Magnet synchronous drive in multiple ways. The PMSM is configured and controlled in position and speed control modes. An effort is made to monitor the PMSM runtime variables like speed, torque and current. The necessary communication protocols are established between the various devices to ensure flawless communication. The real time Performance of the Permanent Magnet Synchronous motor is experimentally verified and captured on the Drive software. Various virtual animated screens are developed to explain the PMSM precise position control applications.