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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 mainly comprising motor control units. They have been utilized ever since the 1950's by the automobile trade, since they made use of lots of electric motors. Now, they are used in other industrial and commercial applications.
In factory assembly for motor starter; motor control centers are fairly common method. The MCC's comprise metering, variable frequency drives and programmable controllers. The MCC's are usually found in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors that vary from 230 V to 600V. Medium voltage motor control centers are designed for large motors which range from 2300 volts to 15000 volts. These units utilize vacuum contractors for switching with separate compartments in order to attain power control and switching.
Within factory locations and area that have corrosive or dusty processing, the MCC can be installed in climate controlled separated locations. Usually the MCC will be situated on the factory floor adjacent to the machinery 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 in order to complete testing or maintenance, whereas extremely large controllers could be bolted in place. Each motor controller consists of a solid state motor controller or a contractor, overload relays to protect the motor, circuit breaker or fuses to supply short-circuit protection as well as a disconnecting switch to be able to isolate the motor circuit. Separate connectors enable 3-phase power so as to enter the controller. The motor is wired to terminals situated inside the controller. Motor control centers offer wire ways for power cables and field control.
Each motor controller inside a motor control center could be specified with several alternatives. These options comprise: separate control transformers, extra control terminal blocks, control switches, pilot lamps, and many kinds of bi-metal and solid-state overload protection relays. They also have different classes of kinds of circuit breakers and power fuses.
Concerning the delivery of motor control centers, there are numerous alternatives for the customer. 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 can be supplied prepared for the customer to connect all field wiring.
Motor control centers usually sit on the floor and should have a fire-resistance rating. Fire stops may be needed for cables that penetrate fire-rated floors and walls.