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Motor Control Centers or otherwise called MCC's, are an assembly of one enclosed section or more, that have a common power bus principally consisting of motor control units. They have been used since the 1950's by the vehicle trade, as they made use of many electric motors. Nowadays, they are utilized in various industrial and commercial applications.
Motor control centers are a modern technique in factory assembly for several motor starters. This particular machinery could consist of metering, variable frequency drives and programmable controllers. The MCC's are commonly seen in the electrical service entrance for a building. Motor control centers often are utilized for low voltage, 3-phase alternating current motors that range from 230 volts to 600 volts. Medium voltage motor control centers are designed for large motors which range from 2300V to 15000 V. These units make use of vacuum contractors for switching with separate compartments in order to achieve power switching and control.
In factory area and locations which have corrosive or dusty processing, the MCC can be installed in climate controlled separated locations. Normally the MCC would be positioned on the factory floor close to the machinery 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. To be able 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 contractor or a solid state motor controller, overload relays to protect the motor, circuit breaker or fuses so as to provide short-circuit protection as well as a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power in order 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 in a motor control center could be specified with a range of options. These choices include: separate control transformers, extra control terminal blocks, control switches, pilot lamps, and many types of solid-state and bi-metal overload protection relays. They also have various classes of kinds of power fuses and circuit breakers.
Concerning the delivery of motor control centers, there are numerous options for the consumer. 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 supplied prepared for the customer to connect all field wiring.
Motor control centers typically sit on the floor and should have a fire-resistance rating. Fire stops may be needed for cables which penetrate fire-rated walls and floors.
