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MCC's or Motor Control Centersare an assembly of one or more sections which include a common power bus. These have been used in the vehicle industry ever since the 1950's, since they were used lots of electric motors. These days, they are used in a variety of industrial and commercial applications.
Motor control centers are a modern practice in factory assembly for some motor starters. This machine can comprise variable frequency drives, programmable controllers and metering. The MCC's are usually used in the electrical service entrance for a building. Motor control centers frequently are used for low voltage, 3-phase alternating current motors which range from 230 V to 600V. Medium voltage motor control centers are intended for large motors that range from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments in order to accomplish power control and switching.
Inside factory locations and area which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Typically the MCC would be positioned on the factory floor next to the machinery it is controlling.
For plug-in mounting of individual motor controls, A motor control center has one or more vertical metal cabinet sections with power bus. To be able to complete testing or maintenance, extremely large controllers can be bolted into place, whereas smaller controllers could be unplugged from the cabinet. Each motor controller has a solid state motor controller or a contractor, overload relays to protect the motor, fuses or circuit breakers in order to supply short-circuit protection and a disconnecting switch to be able to isolate the motor circuit. Separate connectors enable 3-phase power to be able to enter the controller. The motor is wired to terminals situated in the controller. Motor control centers offer wire ways for field control and power cables.
Each motor controller inside a motor control center can be specified with various choices. These choices include: separate control transformers, extra control terminal blocks, control switches, pilot lamps, and numerous kinds of solid-state and bi-metal overload protection relays. They likewise comprise different classes of types of power fuses and circuit breakers.
Concerning the delivery of motor control centers, there are numerous options for the client. These could be delivered as an engineered assembly with a programmable controller together with internal control or with interlocking wiring to a central control terminal panel board. On the other hand, they could be provided prepared for the customer to connect all field wiring.
Motor control centers usually sit on the floor and must have a fire-resistance rating. Fire stops can be needed for cables that go through fire-rated walls and floors.
