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Motor Control Centers or otherwise called MCC's, are an assembly of one or more enclosed sections, which have a common power bus mainly consisting of motor control units. They have been used since the 1950's by the automobile trade, in view of the fact that they used a large number of electric motors. Today, they are utilized in various commercial and industrial applications.
In factory assembly for motor starter; motor control centers are rather common technique. The MCC's include metering, variable frequency drives and programmable controllers. The MCC's are normally utilized in the electrical service entrance for a building. Motor control centers often are utilized for low voltage, 3-phase alternating current motors which vary from 230 V to 600V. Medium voltage motor control centers are designed for large motors which vary from 2300 volts to 15000 volts. These units utilize vacuum contractors for switching with separate compartments in order to achieve power control and switching.
Within factory area and locations which have dusty or corrosive processing, the MCC can be installed in climate controlled separated locations. Normally the MCC would be positioned 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. To be able to complete testing or maintenance, really large controllers can be bolted into place, whereas smaller controllers may be unplugged from the cabinet. Every motor controller has a contractor or a solid state motor controller, overload relays to protect the motor, fuses or circuit breakers to be able to provide short-circuit protection as well as a disconnecting switch in order to isolate the motor circuit. Separate connectors allow 3-phase power so as to enter the controller. The motor is wired to terminals situated inside the controller. Motor control centers offer wire ways for power cables and field control.
Each and every motor controller in a motor control center could be specified with different alternatives. These options comprise: separate control transformers, extra control terminal blocks, control switches, pilot lamps, as well as various kinds of solid-state and bi-metal overload protection relays. They even comprise different classes of kinds of circuit breakers and power fuses.
There are several choices regarding delivery of MCC's to the customer. They can 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 can be supplied ready for the customer to connect all field wiring.
Motor control centers usually sit on the floor and should have a fire-resistance rating. Fire stops can be necessary for cables that penetrate fire-rated floors and walls.
