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MCC's or also known as Motor Control Centersare an assembly of one section or more which include a common power bus. These have been utilized in the automobile industry since the 1950's, for the reason that they were utilized many electric motors. Now, they are used in a variety of industrial and commercial applications.
Motor control centers are a modern practice in factory assembly for some motor starters. This particular equipment could consist of metering, variable frequency drives and programmable controllers. The MCC's are normally used in the electrical service entrance for a building. Motor control centers frequently 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 large motors which range from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments in order to attain power control and switching.
In locations where very corrosive or dusty processes are taking place, the motor control center could be installed in a separate air-conditioned room. Typically the MCC would be situated on the factory floor near 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 large controllers could be bolted into place, while smaller controllers can be unplugged from the cabinet. Every motor controller has a solid state motor controller or a contractor, overload relays to be able to protect the motor, circuit breaker or fuses in order to supply short-circuit protection as well as a disconnecting switch in order to isolate the motor circuit. Separate connectors allow 3-phase power to enter the controller. The motor is wired to terminals positioned inside the controller. Motor control centers supply wire ways for power cables and field control.
Each motor controller inside a motor control center can be specified with a range of alternatives. These alternatives comprise: pilot lamps, separate control transformers, extra control terminal blocks, control switches, as well as various kinds of solid-state and bi-metal overload protection relays. They even have various classes of kinds of circuit breakers and power fuses.
Concerning the delivery of motor control centers, there are several alternatives for the customer. These could be delivered as an engineered assembly with a programmable controller along 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 client to connect all field wiring.
Motor control centers normally sit on the floor and must have a fire-resistance rating. Fire stops may be needed for cables that go through fire-rated floors and walls.
