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Motor Control Centers or likewise called MCC's, are an assembly of one enclosed section or more, that have a common power bus principally containing motor control units. They have been used since the 1950's by the vehicle trade, in view of the fact that they utilized many electric motors. These days, they are utilized in various commercial and industrial applications.
Motor control centers are a modern technique in factory assembly for several motor starters. This machine can include metering, variable frequency drives and programmable controllers. The MCC's are normally used 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 intended for large motors which 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 factory area and locations that have corrosive or dusty processing, the MCC can be installed in climate controlled separated locations. Usually the MCC will be located 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. In order to complete maintenance or testing, very large controllers could be bolted into place, whereas smaller controllers can be unplugged from the cabinet. Every motor controller has a contractor or a solid state motor controller, overload relays to be able to protect the motor, fuses or circuit breakers to supply short-circuit protection and a disconnecting switch to be able to isolate the motor circuit. Separate connectors enable 3-phase power so as to enter the controller. The motor is wired to terminals situated inside the controller. Motor control centers supply wire ways for field control and power cables.
In a motor control center, each motor controller could be specified with several different alternatives. Some of the options consist of: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and numerous kinds of bi-metal and solid-state overload protection relays. They even have various classes of kinds of circuit breakers and power fuses.
Concerning the delivery of motor control centers, there are lots of alternatives for the client. 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. Conversely, they can be provided prepared for the customer to connect all field wiring.
Motor control centers normally sit on the floor and must have a fire-resistance rating. Fire stops may be necessary for cables that penetrate fire-rated walls and floors.
