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Within factory assembly for motor starter; motor control centers are quite common technique. The MCC's include variable frequency drives, programmable controllers and metering. The MCC's are normally seen in the electrical service entrance for a building. Motor control centers often 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 big motors which range from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments to be able to attain power control and switching.
Inside factory locations and area that have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Usually the MCC will be located on the factory floor next to the machines 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 in order to complete maintenance or testing, while extremely large controllers could be bolted in place. Every motor controller has a contractor or a solid state motor controller, overload relays to protect the motor, fuses or circuit breakers to be able to supply short-circuit protection as well as a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals located inside the controller. Motor control centers offer wire ways for field control and power cables.
In a motor control center, every motor controller could be specified with many various options. Some of the options consist of: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and many kinds of solid-state and bi-metal overload protection relays. They also comprise various classes of kinds of power fuses and circuit breakers.
