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Inside factory assembly for motor starter; motor control centers are fairly common practice. The MCC's consist of variable frequency drives, programmable controllers and metering. The MCC's are commonly seen in the electrical service entrance for a building. Motor control centers often are utilized for low voltage, 3-phase alternating current motors that vary from 230 volts to 600 volts. Medium voltage motor control centers are made for large motors that range from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments to be able to accomplish power switching and control.
In areas where extremely corrosive or dusty methods are happening, the motor control center could be installed in a separate air-conditioned room. Usually the MCC would be located on the factory floor next to the machinery 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 maintenance or testing, whereas really big controllers could be bolted in place. Each motor controller consists of a solid state motor controller or a contractor, overload relays to protect the motor, fuses or circuit breakers in order to supply short-circuit protection and a disconnecting switch to be able 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 supply wire ways for power cables and field control.
Within a motor control center, each motor controller could be specified with numerous different options. Some of the choices include: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and numerous types of bi-metal and solid-state overload protection relays. They likewise comprise various classes of types of power fuses and circuit breakers.
