Variable Frequency Drive and Faults Detection Using Microcontroller

This paper will explore the benefits of VFD operation and motor protection through microcontroller while providing guidance on proper application. Variable Frequency Drives (VFDs) are the preferred method of controlling AC drive (AC motor). AC motor drives are widely used to control the speed of conveyor systems, blower speeds, pump speeds, machine tool speeds, and other applications that need variable speed with variable torque. By, VFDs can significantly reduce energy consumption and operating costs of the entire system while providing operational benefits to the owner. The circuit will take the full control of the motor and it will protect the motor from the several faults such as short-circuit, overload, and overheat, under voltage, over voltage, phase failure. The protection of induction motor with microcontroller has flexibility to switch off at the required time, monitors every fault of motor at every time and every motoring action is known through the LCD display. In our project we are using the popular 8 bit microcontroller AT89C52. It is a 40 pin microcontroller.