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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 principally consisting of motor control units. They have been used ever since the 1950's by the automobile industry, since they made use of a lot of electric motors. Now, they are utilized in other commercial and industrial applications.
In factory assembly for motor starter; motor control centers are quite common technique. The MCC's comprise metering, variable frequency drives and programmable controllers. The MCC's are commonly used in the electrical service entrance for a building. Motor control centers often are utilized for low voltage, 3-phase alternating current motors that range from 230 V to 600V. Medium voltage motor control centers are made for big motors which vary from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments in order to achieve power switching and control.
In areas where very dusty or corrosive processes are occurring, the motor control center can be established in a separate air-conditioned room. Usually the MCC will be positioned on the factory floor adjacent to the machines 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. So as to complete testing or maintenance, really large controllers can be bolted into place, whereas smaller controllers may be unplugged from the cabinet. Each and 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 and a disconnecting switch in order to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals situated in the controller. Motor control centers offer wire ways for field control and power cables.
Each motor controller in a motor control center can be specified with various choices. These alternatives include: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and various kinds of bi-metal and solid-state overload protection relays. They likewise have various classes of types of circuit breakers and power fuses.
There are many alternatives 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 along with internal control. On the other hand, they could be provided ready for the client to connect all field wiring.
Motor control centers normally sit on the floor and must have a fire-resistance rating. Fire stops could be necessary for cables which penetrate fire-rated walls and floors.
