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MCC's or Motor Control Centersare an assembly of one section or more which have a common power bus. These have been used in the vehicle trade since the 1950's, in view of the fact that they were used a large number of electric motors. Today, they are utilized in various industrial and commercial applications.
Motor control centers are a modern technique in factory assembly for several motor starters. This machine could consist of metering, variable frequency drives and programmable controllers. The MCC's are usually seen in the electrical service entrance for a building. Motor control centers frequently 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 big motors which range from 2300 volts to 15000 volts. These units utilize vacuum contractors for switching with separate compartments to be able to achieve power control and switching.
In factory area and locations which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Usually the MCC will be positioned on the factory floor near the machines 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, whereas really big controllers can be bolted in place. Every motor controller has a contractor or a solid state motor controller, overload relays to protect the motor, fuses or circuit breakers to provide short-circuit protection as well as a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals located in the controller. Motor control centers supply wire ways for field control and power cables.
Each motor controller in a motor control center could be specified with a range of options. These choices consist of: separate control transformers, extra control terminal blocks, control switches, pilot lamps, as well as many types of solid-state and bi-metal overload protection relays. They even have different classes of types of circuit breakers and power fuses.
There are numerous options concerning delivery of MCC's to the client. 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 provided set for the client to connect all field wiring.
MCC's generally sit on floors that should have a fire-resistance rating. Fire stops may be necessary for cables which penetrate fire-rated floors and walls.
