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Motor control centers are a modern practice in factory assembly for several motor starters. This particular equipment can comprise variable frequency drives, programmable controllers and metering. The MCC's are normally found in the electrical service entrance for a building. Motor control centers often are used for low voltage, 3-phase alternating current motors that range from 230 V to 600V. Medium voltage motor control centers are designed for big motors that range from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments in order to achieve power switching and control.
Inside factory locations and area which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Typically the MCC would be positioned 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 to be able to complete testing or maintenance, while very big controllers could 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 and a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power in order to enter the controller. The motor is wired to terminals positioned inside the controller. Motor control centers provide wire ways for power cables and field control.
Inside a motor control center, each and every motor controller can be specified with a lot of different alternatives. Some of the choices include: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and numerous kinds of solid-state and bi-metal overload protection relays. They even have different classes of kinds of power fuses and circuit breakers.
