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Motor Control Centers or MCC's, are an assembly of one or more enclosed sections, which have a common power bus mainly consisting of motor control units. They have been used since the 1950's by the vehicle industry, since they utilized a lot of electric motors. Nowadays, they are utilized in other industrial and commercial applications.
In factory assembly for motor starter; motor control centers are quite common technique. The MCC's include metering, variable frequency drives and programmable controllers. The MCC's are normally seen in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors which range from 230 volts to 600 volts. Medium voltage motor control centers are intended for large motors that range from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments to be able to attain power control and switching.
In places where extremely corrosive or dusty methods are taking place, the motor control center could be established in a separate air-conditioned room. Usually the MCC would be located on the factory floor near the machines it is controlling.
A MCC has one or more vertical metal cabinet sections with power bus and provisions for plug-in mounting of individual motor controllers. Smaller controllers can be unplugged from the cabinet to complete maintenance or testing, whereas really large controllers can be bolted in place. Each and every motor controller has a contractor or a solid state motor controller, 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 in order to enter the controller. The motor is wired to terminals located inside the controller. Motor control centers provide wire ways for field control and power cables.
Each motor controller inside a motor control center can be specified with different options. These options include: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and numerous types of solid-state and bi-metal overload protection relays. They also comprise different classes of types of circuit breakers and power fuses.
There are numerous 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 can be provided ready for the client to connect all field wiring.
Motor control centers typically sit on the floor and should have a fire-resistance rating. Fire stops can be necessary for cables which penetrate fire-rated walls and floors.