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Within factory assembly for motor starter; motor control centers are fairly common method. The MCC's comprise variable frequency drives, programmable controllers and metering. The MCC's are normally found in the electrical service entrance for a building. Motor control centers frequently are used for low voltage, 3-phase alternating current motors that vary from 230 volts to 600 volts. Medium voltage motor control centers are made for big motors that vary from 2300 volts to 15000 volts. These units utilize vacuum contractors for switching with separate compartments to be able to achieve power control and switching.
Inside factory area and locations which have corrosive or dusty processing, the MCC can be installed in climate controlled separated locations. Typically the MCC would be situated on the factory floor adjacent to the machinery 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. So as to complete maintenance or testing, extremely big controllers could be bolted into place, while smaller controllers could be unplugged from the cabinet. Every motor controller consists of a contractor or a solid state motor controller, overload relays to be able to protect the motor, circuit breaker or fuses to supply short-circuit protection as well as a disconnecting switch so as to isolate the motor circuit. Separate connectors allow 3-phase power so as to enter the controller. The motor is wired to terminals located inside the controller. Motor control centers provide wire ways for power cables and field control.
Every motor controller inside a motor control center could be specified with several alternatives. These options comprise: pilot lamps, separate control transformers, extra control terminal blocks, control switches, as well as many types of bi-metal and solid-state overload protection relays. They even have various classes of types of power fuses and circuit breakers.