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Motor control centers are a modern technique in factory assembly for some motor starters. This machinery can include metering, variable frequency drives and programmable controllers. The MCC's are usually utilized in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors that range from 230 volts to 600 volts. Medium voltage motor control centers are made for big motors which vary from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments to be able to achieve power control and switching.
In areas where extremely corrosive or dusty processes are taking place, the motor control center may be established in a separate air-conditioned room. Typically the MCC would be positioned 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 maintenance or testing, whereas extremely big controllers can be bolted in place. Each 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 to enter the controller. The motor is wired to terminals positioned inside the controller. Motor control centers supply wire ways for field control and power cables.
Every motor controller inside a motor control center could be specified with different options. These options comprise: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and various types of solid-state and bi-metal overload protection relays. They likewise comprise different classes of kinds of circuit breakers and power fuses.
