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Inside factory assembly for motor starter; motor control centers are somewhat common method. The MCC's consist of metering, variable frequency drives and programmable controllers. The MCC's are normally found in the electrical service entrance for a building. Motor control centers commonly 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 that range from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments in order to achieve power control and switching.
Within factory area and locations which have dusty or corrosive processing, the MCC can be installed in climate controlled separated locations. Typically the MCC would be situated on the factory floor next 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 complete maintenance or testing, whereas really large controllers could be bolted in place. Each motor controller has a solid state motor controller or a contractor, overload relays so as to protect the motor, fuses or circuit breakers to be able to provide short-circuit protection and a disconnecting switch in order to isolate the motor circuit. Separate connectors enable 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 field control and power cables.
Every motor controller in a motor control center can be specified with different options. These choices 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 types of power fuses and circuit breakers.
