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In factory assembly for motor starter; motor control centers are rather common practice. The MCC's include metering, variable frequency drives and programmable controllers. The MCC's are usually found in the electrical service entrance for a building. Motor control centers frequently are utilized for low voltage, 3-phase alternating current motors that vary from 230 V to 600V. Medium voltage motor control centers are designed for large motors which vary from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments to be able to accomplish power switching and control.
In locations where very dusty or corrosive processes are occurring, the motor control center can be established in a separate air-conditioned room. Normally the MCC will be positioned on the factory floor close 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. In order to complete maintenance or testing, extremely large controllers could be bolted into place, whereas smaller controllers may be unplugged from the cabinet. Each and every motor controller consists of a solid state motor controller or a contractor, overload relays In order to protect the motor, fuses or circuit breakers to supply 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 in the controller. Motor control centers supply 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 options. Some of the options comprise: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and numerous kinds of bi-metal and solid-state overload protection relays. They even comprise different classes of types of power fuses and circuit breakers.
