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Motor Control Centers or likewise called MCC's, are an assembly of one enclosed section or more, that have a common power bus mainly containing motor control units. They have been utilized ever since the 1950's by the automobile trade, as they utilized a lot of electric motors. Now, they are utilized in various industrial and commercial applications.
Inside factory assembly for motor starter; motor control centers are rather common method. The MCC's comprise variable frequency drives, programmable controllers and metering. The MCC's are commonly found in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors which range from 230 volts to 600 volts. Medium voltage motor control centers are designed for big motors which vary from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments so as to accomplish power control and switching.
In factory area and locations which have dusty or corrosive processing, the MCC can be installed in climate controlled separated locations. Normally the MCC would be situated on the factory floor close to the equipment it is controlling.
A MCC has one or more vertical metallic cabinet sections with power bus and provisions for plug-in mounting of individual motor controllers. Smaller controllers may be unplugged from the cabinet so as to complete maintenance or testing, while very large controllers can be bolted in place. Each motor controller consists of a contractor or a solid state motor controller, overload relays to protect the motor, circuit breaker or fuses in order to provide short-circuit protection as well as a disconnecting switch to be able to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals situated within the controller. Motor control centers supply wire ways for power cables and field control.
Inside a motor control center, each and every motor controller could be specified with lots of different alternatives. Some of the alternatives comprise: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and many types of solid-state and bi-metal overload protection relays. They also comprise various classes of types of power fuses and circuit breakers.
There are lots of choices regarding delivery of MCC's to the client. They can be delivered as an engineered assembly with interlocking wiring to a central control terminal panel board or programmable controller along with internal control. Conversely, they could be supplied ready for the customer to connect all field wiring.
Motor control centers typically sit on the floor and must have a fire-resistance rating. Fire stops can be required for cables which penetrate fire-rated walls and floors.
