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Motor Control Centers or otherwise called MCC's, are an assembly of one enclosed section or more, that have a common power bus principally consisting of motor control units. They have been used since the 1950's by the auto business, in view of the fact that they made use of many electric motors. These days, they are used in different commercial and industrial applications.
In factory assembly for motor starter; motor control centers are quite common technique. The MCC's include programmable controllers, metering and variable frequency drives. The MCC's are commonly found in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors which range from 230 V to 600V. Medium voltage motor control centers are designed for big motors that range from 2300 volts to 15000 volts. These units make use of vacuum contractors for switching with separate compartments so as to achieve power control and switching.
In factory locations and area which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Normally the MCC will be positioned 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 be able to complete testing or maintenance, extremely large controllers can be bolted into place, while smaller controllers may be unplugged from the cabinet. Each and 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 to be able to supply short-circuit protection and a disconnecting switch to be able to isolate the motor circuit. Separate connectors allow 3-phase power to enter the controller. The motor is wired to terminals located in the controller. Motor control centers supply wire ways for power cables and field control.
Every motor controller within a motor control center can be specified with different alternatives. These alternatives include: pilot lamps, separate control transformers, extra control terminal blocks, control switches, as well as many kinds of bi-metal and solid-state overload protection relays. They likewise comprise various classes of types of circuit breakers and power fuses.
Concerning the delivery of motor control centers, there are many choices for the customer. 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 can be provided prepared for the client to connect all field wiring.
MCC's usually sit on floors that should have a fire-resistance rating. Fire stops could be required for cables that go through fire-rated floors and walls.
