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MCC's or otherwise known as Motor Control Centersare an assembly of one section or more that have a common power bus. These have been used in the vehicle trade since the 1950's, as they were used a lot of electric motors. These days, they are utilized in other industrial and commercial applications.
Inside factory assembly for motor starter; motor control centers are rather common technique. The MCC's consist of metering, variable frequency drives and programmable controllers. The MCC's are normally seen in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors that range from 230 volts to 600 volts. Medium voltage motor control centers are intended for large motors which vary from 2300V to 15000 V. These units make use of vacuum contractors for switching with separate compartments to be able to attain power switching and control.
In factory area and locations which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Usually the MCC would be positioned on the factory floor near 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 be able to complete testing or maintenance, while really large controllers could be bolted in place. Each and every 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 and a disconnecting switch to be able to isolate the motor circuit. Separate connectors enable 3-phase power in order to enter the controller. The motor is wired to terminals situated inside the controller. Motor control centers provide wire ways for power cables and field control.
In a motor control center, each and every motor controller can be specified with many different options. Some of the options consist of: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and many types of bi-metal and solid-state overload protection relays. They even have various classes of types of power fuses and circuit breakers.
Concerning the delivery of motor control centers, there are numerous alternatives for the client. These could be delivered as an engineered assembly with a programmable controller along with internal control or with interlocking wiring to a central control terminal panel board. On the other hand, they can be provided set for the customer to connect all field wiring.
MCC's usually sit on floors which should have a fire-resistance rating. Fire stops could be necessary for cables which go through fire-rated floors and walls.
