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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 principally comprising motor control units. They have been used ever since the 1950's by the automobile industry, in view of the fact that they made use of many electric motors. Now, they are used in a variety of commercial and industrial applications.
Within factory assembly for motor starter; motor control centers are fairly common technique. The MCC's consist of variable frequency drives, programmable controllers and metering. The MCC's are normally used in the electrical service entrance for a building. Motor control centers often are utilized for low voltage, 3-phase alternating current motors that vary from 230 V to 600V. Medium voltage motor control centers are made for large motors that range from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments so as to achieve power control and switching.
Inside factory area and locations that have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Typically the MCC will be located on the factory floor adjacent to the equipment 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 may be unplugged from the cabinet to complete maintenance or testing, while extremely big controllers could be bolted in place. Each motor controller has a solid state motor controller or a contractor, overload relays so as to protect the motor, fuses or circuit breakers in order to provide short-circuit protection and a disconnecting switch so as to isolate the motor circuit. Separate connectors allow 3-phase power to enter the controller. The motor is wired to terminals located within the controller. Motor control centers supply wire ways for field control and power cables.
Each and every motor controller within a motor control center can be specified with a range of alternatives. These choices comprise: control switches, pilot lamps, separate control transformers, extra control terminal blocks, and numerous kinds of solid-state and bi-metal overload protection relays. They likewise comprise various classes of types of circuit breakers and power fuses.
Regarding the delivery of motor control centers, there are several alternatives for the client. These can 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 ready for the customer to connect all field wiring.
MCC's generally sit on floors which are required to have a fire-resistance rating. Fire stops could be necessary for cables that go through fire-rated walls and floors.
