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MCC's or otherwise known as Motor Control Centersare an assembly of one or more sections that have a common power bus. These have been utilized in the automobile business since the 1950's, since they were used many electric motors. These days, they are utilized in different industrial and commercial applications.
Motor control centers are a modern practice in factory assembly for some motor starters. This machine can include programmable controllers, metering and variable frequency drives. The MCC's are usually seen in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors which 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 attain power control and switching.
Within factory area and locations which have dusty or corrosive processing, the MCC can be installed in climate controlled separated locations. Typically the MCC would be located on the factory floor near the machines 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 can be unplugged from the cabinet to be able to complete testing or maintenance, while extremely big controllers could be bolted in place. Every motor controller consists of a contractor or a solid state motor controller, overload relays to protect the motor, fuses or circuit breakers to supply short-circuit protection and 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 situated in the controller. Motor control centers supply wire ways for field control and power cables.
Each and every motor controller in a motor control center can be specified with different options. These choices include: control switches, pilot lamps, separate control transformers, extra control terminal blocks, and various kinds of solid-state and bi-metal overload protection relays. They even have various classes of types of power fuses and circuit breakers.
Regarding the delivery of motor control centers, there are various options for the customer. 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 could be provided prepared for the client to connect all field wiring.
MCC's usually sit on floors which are required to have a fire-resistance rating. Fire stops can be required for cables which penetrate fire-rated floors and walls.
