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Inside factory assembly for motor starter; motor control centers are quite common method. The MCC's consist of metering, variable frequency drives and programmable controllers. The MCC's are usually utilized in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors which range from 230 V to 600V. Medium voltage motor control centers are designed for big motors that range from 2300 volts to 15000 volts. These units utilize vacuum contractors for switching with separate compartments in order to attain power switching and control.
In areas where extremely dusty or corrosive methods are taking place, the motor control center can be installed in a separate air-conditioned room. Typically the MCC will be located on the factory floor adjacent to the machinery it is controlling.
For plug-in mounting of individual motor controls, A motor control center has one or more vertical metal cabinet sections with power bus. So as to complete testing or maintenance, very large controllers could be bolted into place, while smaller controllers may be unplugged from the cabinet. Each 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 provide short-circuit protection as well as a disconnecting switch to be able to isolate the motor circuit. Separate connectors allow 3-phase power to enter the controller. The motor is wired to terminals positioned within the controller. Motor control centers offer wire ways for power cables and field control.
Inside a motor control center, each motor controller could be specified with a lot of various options. Some of the alternatives consist of: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and many kinds of solid-state and bi-metal overload protection relays. They also comprise different classes of types of power fuses and circuit breakers.