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Motor Control Centers or otherwise called MCC's, are an assembly of one or more enclosed sections, that have a common power bus mainly comprising motor control units. They have been utilized since the 1950's by the auto industry, as they utilized a lot of electric motors. These days, they are utilized in different industrial and commercial applications.
Within factory assembly for motor starter; motor control centers are quite common technique. The MCC's include metering, variable frequency drives and programmable controllers. The MCC's are usually used in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors that vary from 230 V to 600V. Medium voltage motor control centers are designed for big motors which vary from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments in order to achieve power control and switching.
In areas where extremely dusty or corrosive methods are taking place, the motor control center may be established in a separate air-conditioned room. Normally the MCC will be located on the factory floor next to 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 could be unplugged from the cabinet to be able to complete testing or maintenance, whereas really big controllers can be bolted in place. Each and every motor controller has a solid state motor controller or a contractor, overload relays so as to protect the motor, circuit breaker or fuses to supply short-circuit protection and a disconnecting switch in order to isolate the motor circuit. Separate connectors enable 3-phase power in order to enter the controller. The motor is wired to terminals positioned 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 lots of various alternatives. Some of the alternatives comprise: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and many kinds of bi-metal and solid-state overload protection relays. They also comprise various classes of kinds of power fuses and circuit breakers.
Concerning the delivery of motor control centers, there are various options for the consumer. These can 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 set for the client to connect all field wiring.
MCC's generally sit on floors which must have a fire-resistance rating. Fire stops can be needed for cables which penetrate fire-rated walls and floors.
