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MCC's or also known as Motor Control Centersare an assembly of one section or more which contain a common power bus. These have been used in the automobile industry ever since the 1950's, because they were made use of a lot of electric motors. Now, they are used in a variety of commercial and industrial applications.
Motor control centers are a modern technique in factory assembly for some motor starters. This particular machinery could include metering, variable frequency drives and programmable controllers. The MCC's are usually utilized in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors that vary from 230 volts to 600 volts. Medium voltage motor control centers are intended for big motors that vary from 2300 volts to 15000 volts. These units make use of vacuum contractors for switching with separate compartments in order to attain power switching and control.
In locations where very corrosive or dusty processes are happening, the motor control center could be established in a separate air-conditioned room. Typically the MCC will be located on the factory floor next to the equipment it is controlling.
A MCC has one or more vertical metallic cabinet sections with power bus and provisions for plug-in mounting of individual motor controllers. Smaller controllers may be unplugged from the cabinet to complete maintenance or testing, whereas extremely big controllers can be bolted in place. Every motor controller consists of a solid state motor controller or a contractor, overload relays to protect the motor, fuses or circuit breakers so as to supply short-circuit protection as well as a disconnecting switch to be able to isolate the motor circuit. Separate connectors allow 3-phase power to enter the controller. The motor is wired to terminals positioned in the controller. Motor control centers supply wire ways for field control and power cables.
In a motor control center, each and every motor controller can be specified with numerous different alternatives. Some of the options consist of: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and many types of solid-state and bi-metal overload protection relays. They even have different classes of kinds of power fuses and circuit breakers.
There are various choices concerning delivery of MCC's to the client. 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 prepared for the customer to connect all field wiring.
MCC's commonly sit on floors that are required to have a fire-resistance rating. Fire stops may be necessary for cables that penetrate fire-rated floors and walls.
