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MCC's or likewise 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 trade since the 1950's, because they were made use of many electric motors. Today, they are used in a variety of industrial and commercial applications.
Inside factory assembly for motor starter; motor control centers are rather common technique. The MCC's consist of variable frequency drives, programmable controllers and metering. The MCC's are commonly used in the electrical service entrance for a building. Motor control centers frequently are used for low voltage, 3-phase alternating current motors that range from 230 volts to 600 volts. Medium voltage motor control centers are intended for large motors which vary from 2300 volts to 15000 volts. These units make use of vacuum contractors for switching with separate compartments to be able to attain power switching and control.
In locations where very dusty or corrosive methods are taking place, the motor control center could be established in a separate air-conditioned room. Normally the MCC would be situated on the factory floor next 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. To complete testing or maintenance, really large controllers could be bolted into place, whereas smaller controllers may be unplugged from the cabinet. Each and every motor controller consists of a contractor or a solid state motor controller, overload relays so as to protect the motor, circuit breaker or fuses 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 so as 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 several various choices. Some of the choices include: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and numerous types of solid-state and bi-metal overload protection relays. They even comprise different classes of types of circuit breakers and power fuses.
There are a lot of choices regarding delivery of MCC's to the customer. 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 could be provided ready for the customer to connect all field wiring.
Motor control centers normally sit on the floor and must have a fire-resistance rating. Fire stops can be necessary for cables that penetrate fire-rated floors and walls.
