L&T Variable Frequency Drive is widely used in electro-mechanical drive systems for controlling torque and speed of AC motors. This drive consists of controller assembly, AC motor, and operator interface. This drive is very important for speed control with complete torque, which is possible via the maximum rated speed. If the latter speed requirements to be surpassed, then torque requirements to be reduced. The L&T variable frequency drives operate by manipulating the output frequency via alteration of incoming AC current to DC.