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Motor Control Centers or likewise called MCC's, are an assembly of one or more enclosed sections, which have a common power bus mostly containing motor control units. They have been utilized since the 1950's by the automobile industry, because they made use of lots of electric motors. Now, they are used in a variety of commercial and industrial applications.
Within factory assembly for motor starter; motor control centers are somewhat common practice. The MCC's comprise variable frequency drives, programmable controllers and metering. The MCC's are normally utilized in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors which vary from 230 V to 600V. Medium voltage motor control centers are intended for large motors which range from 2300V to 15000 V. These units make use of vacuum contractors for switching with separate compartments to be able to accomplish power control and switching.
Within factory locations and area which have corrosive or dusty processing, the MCC can be installed in climate controlled separated locations. Typically the MCC will be situated on the factory floor adjacent to 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. To be able to complete testing or maintenance, extremely large controllers can be bolted into place, whereas smaller controllers may be unplugged from the cabinet. Every 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 and a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power in order to enter the controller. The motor is wired to terminals located within the controller. Motor control centers offer wire ways for field control and power cables.
Every motor controller inside a motor control center could be specified with different alternatives. These choices comprise: control switches, pilot lamps, separate control transformers, extra control terminal blocks, as well as many kinds of bi-metal and solid-state overload protection relays. They likewise comprise different classes of types of circuit breakers and power fuses.
Concerning the delivery of motor control centers, there are a lot of options for the client. These can 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 can be supplied set for the customer to connect all field wiring.
Motor control centers typically sit on the floor and should have a fire-resistance rating. Fire stops may be needed for cables that go through fire-rated floors and walls.
