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MCC's or otherwise known as Motor Control Centersare an assembly of one or more sections which contain a common power bus. These have been utilized in the vehicle trade since the 1950's, because they were used a lot of electric motors. These days, they are used in a variety of commercial and industrial applications.
In factory assembly for motor starter; motor control centers are fairly common practice. The MCC's include programmable controllers, metering and variable frequency drives. The MCC's are usually found in the electrical service entrance for a building. Motor control centers frequently 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 that 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 control and switching.
In locations where very corrosive or dusty methods are happening, the motor control center may be installed in a separate air-conditioned room. Normally the MCC will be positioned on the factory floor close to 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. So as to complete maintenance or testing, very large controllers could be bolted into place, whereas smaller controllers can be unplugged from the cabinet. Each motor controller consists of a solid state motor controller or a contractor, overload relays In order 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 enable 3-phase power to enter the controller. The motor is wired to terminals located in the controller. Motor control centers offer wire ways for field control and power cables.
In a motor control center, each and every motor controller could be specified with several various choices. Some of the choices consist of: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and many types of bi-metal and solid-state overload protection relays. They likewise comprise different classes of types of power fuses and circuit breakers.
Concerning the delivery of motor control centers, there are many alternatives for the consumer. 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. Conversely, they could be supplied ready for the client to connect all field wiring.
Motor control centers normally sit on the floor and should have a fire-resistance rating. Fire stops may be necessary for cables which penetrate fire-rated floors and walls.