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Motor Control Centers or likewise called MCC's, are an assembly of one enclosed section or more, which have a common power bus principally containing motor control units. They have been used since the 1950's by the automobile trade, as they made use of a large number of electric motors. Now, they are used in various industrial and commercial applications.
Motor control centers are a modern method in factory assembly for some motor starters. This particular equipment can include metering, variable frequency drives and programmable controllers. The MCC's are usually utilized in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors that range from 230 V to 600V. Medium voltage motor control centers are made for big motors that range from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments in order to achieve power switching and control.
In places where very dusty or corrosive methods are occurring, the motor control center could be established in a separate air-conditioned room. Normally the MCC will be positioned on the factory floor adjacent 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 testing or maintenance, while extremely large controllers could be bolted in place. Every motor controller consists of a contractor or a solid state motor controller, overload relays to protect the motor, fuses or circuit breakers to be able to provide short-circuit protection and a disconnecting switch to be able to isolate the motor circuit. Separate connectors allow 3-phase power so as to enter the controller. The motor is wired to terminals situated in the controller. Motor control centers supply wire ways for field control and power cables.
Each motor controller within a motor control center could be specified with a range of alternatives. These alternatives comprise: control switches, pilot lamps, separate control transformers, extra control terminal blocks, and many kinds of solid-state and bi-metal overload protection relays. They likewise comprise various classes of types of power fuses and circuit breakers.
There are a lot of alternatives concerning delivery of MCC's to the customer. They could 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 can be supplied prepared for the client to connect all field wiring.
Motor control centers normally sit on the floor and must have a fire-resistance rating. Fire stops can be necessary for cables which penetrate fire-rated floors and walls.
