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MCC's or Motor Control Centersare an assembly of one or more sections that include a common power bus. These have been utilized in the automobile business ever since the 1950's, as they were utilized lots of electric motors. Nowadays, they are used in other industrial and commercial applications.
Motor control centers are a modern practice in factory assembly for several motor starters. This particular equipment could comprise variable frequency drives, programmable controllers and metering. The MCC's are usually found in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors which vary from 230 volts to 600 volts. Medium voltage motor control centers are designed for large motors that vary from 2300 volts to 15000 volts. These units make use of vacuum contractors for switching with separate compartments so as to achieve power switching and control.
In locations where extremely corrosive or dusty methods are taking place, the motor control center could be installed in a separate air-conditioned room. Normally the MCC would be positioned on the factory floor next to 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 could be unplugged from the cabinet to complete testing or maintenance, whereas extremely big controllers can be bolted in place. Each and every motor controller has a contractor or a solid state motor controller, overload relays so as to protect the motor, fuses or circuit breakers to provide short-circuit protection and a disconnecting switch so as to isolate the motor circuit. Separate connectors allow 3-phase power in order to enter the controller. The motor is wired to terminals situated within the controller. Motor control centers supply wire ways for power cables and field control.
Within a motor control center, each and every motor controller can be specified with a lot of different options. Some of the alternatives comprise: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and numerous kinds of bi-metal and solid-state overload protection relays. They likewise comprise different classes of types of power fuses and circuit breakers.
Concerning the delivery of motor control centers, there are lots of options for the consumer. These could be delivered as an engineered assembly with a programmable controller together 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 client to connect all field wiring.
Motor control centers normally sit on the floor and must have a fire-resistance rating. Fire stops can be needed for cables which penetrate fire-rated floors and walls.
