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Motor Control Centers or likewise called MCC's, are an assembly of one or more enclosed sections, which have a common power bus mostly comprising motor control units. They have been utilized ever since the 1950's by the auto trade, in view of the fact that they made use of many electric motors. Nowadays, they are utilized in a variety of industrial and commercial applications.
Motor control centers are a modern technique in factory assembly for some motor starters. This equipment can include programmable controllers, metering and variable frequency drives. The MCC's are normally 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 volts to 600 volts. Medium voltage motor control centers are intended for large motors which vary from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments to be able to attain power switching and control.
In places where extremely dusty or corrosive processes are occurring, the motor control center could be installed in a separate air-conditioned room. Typically the MCC would be positioned on the factory floor near the equipment 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 can be unplugged from the cabinet to be able to complete testing or maintenance, whereas extremely big controllers can be bolted in place. Each 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 supply short-circuit protection as well as a disconnecting switch to be able to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals located inside the controller. Motor control centers supply wire ways for power cables and field control.
Each motor controller in a motor control center can be specified with a range of choices. These 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 have various classes of types of power fuses and circuit breakers.
There are several choices regarding delivery of MCC's to the customer. They could be delivered as an engineered assembly with interlocking wiring to a central control terminal panel board or programmable controller together with internal control. Conversely, they could be provided ready for the client to connect all field wiring.
MCC's usually sit on floors which must have a fire-resistance rating. Fire stops could be necessary for cables which penetrate fire-rated floors and walls.
