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Motor control centers are a modern practice in factory assembly for several motor starters. This particular machine could consist of metering, variable frequency drives and programmable controllers. The MCC's are commonly found in the electrical service entrance for a building. Motor control centers often are utilized for low voltage, 3-phase alternating current motors which vary from 230 V to 600V. Medium voltage motor control centers are intended for big motors that vary from 2300 volts to 15000 volts. These units make use of vacuum contractors for switching with separate compartments so as to accomplish power switching and control.
In factory locations and area which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Usually the MCC would be positioned on the factory floor adjacent to the equipment 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 can be unplugged from the cabinet to be able to complete maintenance or testing, while very large controllers can be bolted in place. Each motor controller consists of a contractor or a solid state motor controller, overload relays to protect the motor, fuses or circuit breakers to be able to provide short-circuit protection as well as a disconnecting switch in order to isolate the motor circuit. Separate connectors allow 3-phase power to be able to enter the controller. The motor is wired to terminals situated inside the controller. Motor control centers supply wire ways for power cables and field control.
Every motor controller in a motor control center can be specified with a range of alternatives. These options comprise: control switches, pilot lamps, separate control transformers, extra control terminal blocks, and many kinds of solid-state and bi-metal overload protection relays. They also comprise different classes of types of power fuses and circuit breakers.
