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MCC's or otherwise known as Motor Control Centersare an assembly of one section or more that contain a common power bus. These have been utilized in the automobile trade since the 1950's, as they were used lots of electric motors. Nowadays, they are used in various industrial and commercial applications.
Inside factory assembly for motor starter; motor control centers are quite common method. The MCC's include variable frequency drives, programmable controllers and metering. The MCC's are usually found in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors which vary from 230 volts to 600 volts. Medium voltage motor control centers are intended for big motors that range from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments to be able to achieve power switching and control.
In areas where very corrosive or dusty methods are happening, the motor control center could be installed in a separate air-conditioned room. Usually the MCC would be situated on the factory floor close to the equipment 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. So as to complete testing or maintenance, extremely large controllers could be bolted into place, while smaller controllers could be unplugged from the cabinet. Each and every motor controller consists of a solid state motor controller or a contractor, overload relays to protect the motor, fuses or circuit breakers to supply short-circuit protection as well as 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 offer wire ways for field control and power cables.
Within a motor control center, each and every motor controller could be specified with lots of various choices. Some of the options comprise: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and many kinds of solid-state and bi-metal overload protection relays. They likewise comprise different classes of types of power fuses and circuit breakers.
There are numerous options regarding delivery of MCC's to the customer. They could be delivered as an engineered assembly with interlocking wiring to a central control terminal panel board or programmable controller along with internal control. On the other hand, they could be supplied ready for the client to connect all field wiring.
Motor control centers normally sit on the floor and should have a fire-resistance rating. Fire stops may be necessary for cables that penetrate fire-rated floors and walls.
