Introduction to Motor Control Center
Motor Control center is a group of circuit breaker that located and arranged in such manner to obtain start, stop, and protective function of the motor which is the command comes from the human machine interface (control room). How to make them reliable and save during energized. please find bellow,
Distribution systems used in large commercial and industrial applications can be complex. Power may be distributed through various switchboards, transformers, and panelboards. Power distributed throughout a commercial or industrial application
is used for a variety of applications such as heating, cooling,lighting, and motor-driven machinery.
Basic Motor Control Wherever motors are used, they must be controlled.The most basic type of AC motor control, for example, involves turning the motor on and off. This is often accomplished by using a motor starter, which is made up of a contactor and an overload relay. The contactor’s contacts are closed to start the motor and opened to stop the motor. This is accomplished electromechanically using start and stop pushbuttons or other pilot devices wired to control the contactor. The overload relay protects the motor by disconnecting power to the motor when an overload condition exists. An overload could occur, for instance, when a conveyor is jammed. Although the overload relay provides protection from overloads, it does not provide short-circuit protection for the wiring providing power to the motor. For this reason, a circuit breaker or fuses are also used.
Typically one motor starter controls one motor. When only afew geographically dispersed AC motors are used, the circuit protection and control components may be located in a panel near the motor. In many co mercial and industrial applications quite a few electric motors are required, and it is often desirable to control some or all of the motors from a central location. The apparatus designed for this function is the motor control center (MCC). Motor control centers are simply physical groupings of combination starters in one assembly. A combination starter is a single enclosure containing the motor starter and the fuses or circuit breaker.
