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Motor Control Centers or also called MCC's, are an assembly of one enclosed section or more, which have a common power bus mostly containing motor control units. They have been used since the 1950's by the automobile trade, for the reason that they utilized many electric motors. These days, they are used in different commercial and industrial applications.
Motor control centers are a modern technique in factory assembly for some motor starters. This equipment can comprise programmable controllers, metering and variable frequency drives. The MCC's are normally found 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 volts to 600 volts. Medium voltage motor control centers are made for big motors which range from 2300 volts to 15000 volts. These units make use of vacuum contractors for switching with separate compartments to be able to achieve power switching and control.
In areas where extremely dusty or corrosive methods are taking place, the motor control center may be installed in a separate air-conditioned room. Typically the MCC will be positioned on the factory floor near the equipment 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 big controllers could be bolted into place, while smaller controllers may be unplugged from the cabinet. Each motor controller has a solid state motor controller or a contractor, overload relays to be able to protect the motor, circuit breaker or fuses to supply short-circuit protection as well as a disconnecting switch in order to isolate the motor circuit. Separate connectors enable 3-phase power so as to enter the controller. The motor is wired to terminals located in the controller. Motor control centers supply wire ways for field control and power cables.
Inside a motor control center, each motor controller could be specified with lots of various alternatives. Some of the alternatives include: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and numerous types of bi-metal and solid-state overload protection relays. They also comprise various classes of types of power fuses and circuit breakers.
There are a lot of choices regarding delivery of MCC's to the client. 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 can be provided set for the customer to connect all field wiring.
MCC's generally sit on floors that must have a fire-resistance rating. Fire stops may be needed for cables which go through fire-rated floors and walls.
