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MCC's or Motor Control Centersare an assembly of one or more sections which contain a common power bus. These have been used in the vehicle business since the 1950's, as they were used a lot of electric motors. Now, they are utilized in different industrial and commercial applications.
In factory assembly for motor starter; motor control centers are somewhat common technique. The MCC's 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 often are used for low voltage, 3-phase alternating current motors which vary from 230 V to 600V. Medium voltage motor control centers are designed for big motors that range from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments so as to attain power switching and control.
In locations where very corrosive or dusty methods are happening, the motor control center may be established in a separate air-conditioned room. Normally the MCC will be situated on the factory floor next to the machines 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 could be unplugged from the cabinet in order to complete maintenance or testing, whereas very large 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, 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 enable 3-phase power in order 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.
Every motor controller in a motor control center could be specified with a range of alternatives. These alternatives consist of: control switches, pilot lamps, separate control transformers, extra control terminal blocks, as well as numerous kinds of solid-state and bi-metal overload protection relays. They likewise comprise various classes of types of power fuses and circuit breakers.
There are various alternatives 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 along with internal control. Conversely, they can be supplied ready for the customer to connect all field wiring.
Motor control centers typically 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.
