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MCC's or likewise known as Motor Control Centersare an assembly of one or more sections that have a common power bus. These have been used in the automobile industry since the 1950's, since they were used a lot of electric motors. Now, they are used in a variety of industrial and commercial applications.
Motor control centers are a modern method in factory assembly for several motor starters. This machinery could include variable frequency drives, programmable controllers and metering. The MCC's are usually seen in the electrical service entrance for a building. Motor control centers often are used for low voltage, 3-phase alternating current motors which vary from 230 V to 600V. Medium voltage motor control centers are made for large motors that range from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments to be able to achieve power switching and control.
In locations where very dusty or corrosive methods are occurring, the motor control center may be established in a separate air-conditioned room. Normally the MCC would 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 big controllers can be bolted into place, whereas smaller controllers can be unplugged from the cabinet. Every motor controller consists of a contractor or a solid state motor controller, overload relays to protect the motor, circuit breaker or fuses to provide short-circuit protection and a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power in order to enter the controller. The motor is wired to terminals located inside the controller. Motor control centers offer wire ways for field control and power cables.
Each motor controller inside a motor control center could be specified with several choices. These options comprise: separate control transformers, extra control terminal blocks, control switches, pilot lamps, as well as many kinds of solid-state and bi-metal overload protection relays. They also have various classes of kinds of circuit breakers and power fuses.
Regarding the delivery of motor control centers, there are many choices for the client. These could be delivered as an engineered assembly with a programmable controller together 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 customer to connect all field wiring.
MCC's usually sit on floors which are required to have a fire-resistance rating. Fire stops could be necessary for cables that go through fire-rated floors and walls.
