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Within factory assembly for motor starter; motor control centers are fairly common technique. The MCC's consist of programmable controllers, metering and variable frequency drives. The MCC's are usually found in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors which vary from 230 V to 600V. Medium voltage motor control centers are designed for big motors which range from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments in order to attain power control and switching.
In factory area and locations that have dusty or corrosive processing, the MCC can be installed in climate controlled separated locations. Normally the MCC would be positioned on the factory floor adjacent to the equipment 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. To complete maintenance or testing, really large controllers could be bolted into place, while smaller controllers may be unplugged from the cabinet. 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 provide short-circuit protection and a disconnecting switch to be able 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.
Inside a motor control center, each and every motor controller can be specified with several various choices. Some of the alternatives comprise: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and many kinds of bi-metal and solid-state overload protection relays. They even comprise different classes of kinds of circuit breakers and power fuses.
