Multiple Start Stop Circuit with Schematic and wiring Diagram
The main functions of a motor controller are to start and stop the motor and to protect the motor, machine, and operator. The controller may also be called upon to provide other functions that could include reversing, jogging or inching, plugging, operation at various speeds or at reduced current levels, and controlling motor torque.
The purpose of controller enclosures is to provide protection of operating personnel by preventing accidental contact with energized components. In certain applications, the controller is protected from a variety of environmental conditions including water, rain, snow, sleet, dirt, non-combustible dust, oils, coolants, and lubricants. Motor control centers are designed to meet the requirements of the National Electrical Code (NEC), specifically Article 430 for motors and motor control centers and Article 500 for electric equipment in hazardous locations.