Controling speed of induction motor by using variable frequency drives with plc: A review

In this Paper we have studied the PLC and VFD, its operation which can be used along with the Induction Motor and can control the parameters of it for Automation in industries. The overall scheme and system of implementing V/f control has been presented. One of the basic requirements of this scheme is the PWM Inverter system. In this, PWM Inverters have been modelled and their outputs are fed to the Induction Motor drives system. The uncontrolled singl like transient and steady state response of the Induction Motor has been obtained and analyzed. The speed of the motor is controlled by varying the frequency through triggering the VFD i.e. PWM technique. Thus it causes the output voltage of the VFD according to its turn on time i.e switching time. The inverter converts DC power to AC power at the required frequency and define amplitude. By this the variable frequency is set by VFD and the motor speed can be changed to the required speed. The entire control system is switched by using PLC system. Thus the main Aim of this paper is the monitoring, operating speed control of motor based on VFD and programmable logic controller, and SCADA system is also developed which shows the parameters of IM on the GUI Application based Software.