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Inside factory assembly for motor starter; motor control centers are somewhat common method. The MCC's consist of variable frequency drives, programmable controllers and metering. The MCC's are normally seen in the electrical service entrance for a building. Motor control centers frequently are used for low voltage, 3-phase alternating current motors that range from 230 V to 600V. Medium voltage motor control centers are made for big motors that vary from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments in order to accomplish power control and switching.
In factory area and locations which have dusty or corrosive processing, the MCC could be installed in climate controlled separated locations. Usually the MCC will be situated on the factory floor near the equipment 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 could be unplugged from the cabinet in order to complete testing or maintenance, whereas really big controllers could be bolted in place. Each motor controller has a contractor or a solid state motor controller, overload relays In order to protect the motor, circuit breaker or fuses to supply short-circuit protection as well as a disconnecting switch to be able to isolate the motor circuit. Separate connectors enable 3-phase power so as to enter the controller. The motor is wired to terminals situated within the controller. Motor control centers provide wire ways for power cables and field control.
Each motor controller inside a motor control center could be specified with various choices. These alternatives comprise: control switches, pilot lamps, separate control transformers, extra control terminal blocks, as well as numerous types of bi-metal and solid-state overload protection relays. They likewise have various classes of types of circuit breakers and power fuses.
