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Motor Control Centers or MCC's, are an assembly of one enclosed section or more, that have a common power bus mostly containing motor control units. They have been used ever since the 1950's by the automobile industry, in view of the fact that they utilized lots of electric motors. These days, they are used in different commercial and industrial applications.
Inside factory assembly for motor starter; motor control centers are fairly common practice. The MCC's comprise metering, variable frequency drives and programmable controllers. The MCC's are commonly found 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 designed for large motors which range from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments to be able to achieve power control and switching.
Within factory area and locations that have dusty or corrosive processing, the MCC could be installed in climate controlled separated locations. Typically the MCC will be positioned 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 could be unplugged from the cabinet to complete maintenance or testing, while very big controllers can be bolted in place. Each motor controller has a contractor or a solid state motor controller, overload relays to protect the motor, circuit breaker or fuses to supply short-circuit protection and a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power so as to enter the controller. The motor is wired to terminals positioned inside 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 numerous various choices. Some of the choices consist of: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and many kinds of bi-metal and solid-state overload protection relays. They also have different classes of types of power fuses and circuit breakers.
Regarding the delivery of motor control centers, there are numerous choices for the customer. 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 set for the customer to connect all field wiring.
Motor control centers typically sit on the floor and should have a fire-resistance rating. Fire stops can be required for cables that go through fire-rated floors and walls.
