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MCC's or Motor Control Centersare an assembly of one section or more that contain a common power bus. These have been used in the automobile trade ever since the 1950's, since they were utilized lots of electric motors. Now, they are used in various commercial and industrial applications.
Motor control centers are a modern technique in factory assembly for some motor starters. This particular machine could comprise variable frequency drives, programmable controllers and metering. The MCC's are commonly found in the electrical service entrance for a building. Motor control centers frequently are utilized for low voltage, 3-phase alternating current motors that range from 230 V to 600V. Medium voltage motor control centers are intended for big motors which range from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments in order to achieve power control and switching.
In factory area and locations which have corrosive or dusty processing, the MCC can be installed in climate controlled separated locations. Usually the MCC would be situated on the factory floor close to the machinery 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 could be unplugged from the cabinet so as to complete maintenance or testing, while really big controllers can be bolted in place. Each motor controller has a solid state motor controller or a contractor, overload relays to be able to protect the motor, fuses or circuit breakers to provide short-circuit protection as well as a disconnecting switch in order to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals located inside the controller. Motor control centers offer wire ways for field control and power cables.
Every motor controller inside a motor control center could be specified with various choices. These options include: control switches, pilot lamps, separate control transformers, extra control terminal blocks, as well as numerous kinds of bi-metal and solid-state overload protection relays. They also comprise different classes of kinds of power fuses and circuit breakers.
There are numerous alternatives concerning 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 could be provided 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 can be needed for cables which go through fire-rated walls and floors.
