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In factory assembly for motor starter; motor control centers are fairly common practice. The MCC's comprise metering, variable frequency drives and programmable controllers. The MCC's are usually utilized in the electrical service entrance for a building. Motor control centers frequently are utilized for low voltage, 3-phase alternating current motors that range from 230 volts to 600 volts. Medium voltage motor control centers are made for large motors which range from 2300 volts to 15000 volts. These units utilize vacuum contractors for switching with separate compartments in order to achieve power control and switching.
Inside factory locations and area which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Typically the MCC would be situated on the factory floor near the equipment 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 in order to complete testing or maintenance, whereas extremely big controllers could be bolted in place. Each motor controller has a solid state motor controller or a contractor, overload relays In order to protect the motor, circuit breaker or fuses to provide short-circuit protection as well as a disconnecting switch in order to isolate the motor circuit. Separate connectors enable 3-phase power in order to enter the controller. The motor is wired to terminals situated inside the controller. Motor control centers offer wire ways for field control and power cables.
Each and every motor controller in a motor control center could be specified with several options. These options include: control switches, pilot lamps, separate control transformers, extra control terminal blocks, and many types of solid-state and bi-metal overload protection relays. They also comprise different classes of types of power fuses and circuit breakers.
