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Motor Control Centers or also called MCC's, are an assembly of one enclosed section or more, that have a common power bus mainly consisting of motor control units. They have been utilized since the 1950's by the vehicle trade, as they made use of many electric motors. These days, they are utilized in various commercial and industrial applications.
In factory assembly for motor starter; motor control centers are rather common technique. The MCC's comprise programmable controllers, metering and variable frequency drives. The MCC's are normally found 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 V to 600V. Medium voltage motor control centers are intended for large motors which range from 2300 volts to 15000 volts. These units make use of vacuum contractors for switching with separate compartments to be able to attain power switching and control.
Inside factory locations and area that 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 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. To be able to complete testing or maintenance, extremely large controllers could be bolted into place, whereas smaller controllers could be unplugged from the cabinet. Each motor controller consists of a solid state motor controller or a contractor, overload relays to be able to protect the motor, fuses or circuit breakers to provide short-circuit protection and a disconnecting switch in order to isolate the motor circuit. Separate connectors allow 3-phase power so as to enter the controller. The motor is wired to terminals positioned within the controller. Motor control centers supply wire ways for power cables and field control.
In a motor control center, each motor controller can be specified with lots of various options. Some of the alternatives comprise: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and various kinds of solid-state and bi-metal overload protection relays. They even comprise various classes of kinds of power fuses and circuit breakers.
There are many alternatives regarding 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 together with internal control. On the other hand, they can be provided set for the customer to connect all field wiring.
Motor control centers normally sit on the floor and must have a fire-resistance rating. Fire stops can be necessary for cables which penetrate fire-rated floors and walls.
