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Motor Control Centers or MCC's, are an assembly of one enclosed section or more, which have a common power bus mostly consisting of motor control units. They have been utilized since the 1950's by the automobile trade, for the reason that they made use of lots of electric motors. These days, they are used in different commercial and industrial applications.
Motor control centers are a modern technique in factory assembly for several motor starters. This machine could comprise programmable controllers, metering and variable frequency drives. The MCC's are commonly utilized in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors that vary from 230 volts to 600 volts. Medium voltage motor control centers are designed for large motors which range from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments so as to achieve power switching and control.
In places where extremely dusty or corrosive methods are occurring, the motor control center may be established in a separate air-conditioned room. Usually the MCC would be situated on the factory floor adjacent to the machinery 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 could be unplugged from the cabinet so as to complete testing or maintenance, while really large controllers can be bolted in place. Every motor controller has a solid state motor controller or a contractor, overload relays to be able to protect the motor, fuses or circuit breakers so as to provide short-circuit protection and a disconnecting switch to be able to isolate the motor circuit. Separate connectors allow 3-phase power to enter the controller. The motor is wired to terminals positioned inside the controller. Motor control centers provide wire ways for power cables and field control.
Within a motor control center, each and every motor controller can be specified with many various choices. Some of the options include: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and many types of bi-metal and solid-state overload protection relays. They likewise have different classes of kinds 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 that are required to have a fire-resistance rating. Fire stops could be required for cables that go through fire-rated walls and floors.
