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Motor control centers are a modern method in factory assembly for several motor starters. This machine could include programmable controllers, metering and variable frequency drives. The MCC's are commonly found in the electrical service entrance for a building. Motor control centers often are used for low voltage, 3-phase alternating current motors that vary from 230 V to 600V. Medium voltage motor control centers are intended for large motors that vary from 2300 volts to 15000 volts. These units make use of vacuum contractors for switching with separate compartments in order to attain power switching and control.
In places where very corrosive or dusty methods are taking place, the motor control center could be installed in a separate air-conditioned room. Normally the MCC would be positioned on the factory floor adjacent to the equipment it is controlling.
A MCC has one or more vertical metallic 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 maintenance or testing, while extremely large controllers can be bolted in place. Each and every motor controller has a contractor or a solid state motor controller, overload relays to protect the motor, fuses or circuit breakers to be able to provide short-circuit protection as well as 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 positioned in the controller. Motor control centers supply wire ways for power cables and field control.
Every motor controller in a motor control center can be specified with several alternatives. These choices comprise: control switches, pilot lamps, separate control transformers, extra control terminal blocks, as well as numerous types of solid-state and bi-metal overload protection relays. They likewise have various classes of kinds of circuit breakers and power fuses.
