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Within factory assembly for motor starter; motor control centers are rather common practice. The MCC's include metering, variable frequency drives and programmable controllers. 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 range from 230 volts to 600 volts. Medium voltage motor control centers are designed for large motors that range from 2300 volts to 15000 volts. These units utilize vacuum contractors for switching with separate compartments to be able to attain power switching and control.
Within factory area and locations which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Usually the MCC would be situated on the factory floor near the machinery it is controlling.
A MCC has one or more vertical metal cabinet sections with power bus and provisions for plug-in mounting of individual motor controllers. Smaller controllers can be unplugged from the cabinet to complete testing or maintenance, while extremely 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 provide short-circuit protection as well as 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 field control and power cables.
Each motor controller inside a motor control center can be specified with a range of choices. These choices consist of: extra control terminal blocks, control switches, pilot lamps, separate control transformers, as well as many types of bi-metal and solid-state overload protection relays. They also comprise various classes of kinds of power fuses and circuit breakers.
