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Within factory assembly for motor starter; motor control centers are fairly common practice. The MCC's include programmable controllers, metering and variable frequency drives. The MCC's are commonly used in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors that vary from 230 volts to 600 volts. Medium voltage motor control centers are designed for large motors that vary from 2300 volts to 15000 volts. These units make use of vacuum contractors for switching with separate compartments so as to achieve power switching and control.
Within factory area and locations which have corrosive or dusty processing, the MCC can be installed in climate controlled separated locations. Typically the MCC will be situated on the factory floor close to the machines 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 can be unplugged from the cabinet to be able to complete maintenance or testing, while very big controllers could be bolted in place. Each and every motor controller has a solid state motor controller or a contractor, overload relays to protect the motor, circuit breaker or fuses to provide short-circuit protection as well as a disconnecting switch so as to isolate the motor circuit. Separate connectors allow 3-phase power to be able to enter the controller. The motor is wired to terminals positioned within the controller. Motor control centers offer wire ways for field control and power cables.
In a motor control center, each and every motor controller could be specified with many different choices. Some of the options include: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and numerous kinds of bi-metal and solid-state overload protection relays. They even have various classes of kinds of power fuses and circuit breakers.
