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In factory assembly for motor starter; motor control centers are quite common practice. The MCC's consist of metering, variable frequency drives and programmable controllers. The MCC's are commonly found in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors which vary from 230 volts to 600 volts. Medium voltage motor control centers are designed for big motors that range from 2300 volts to 15000 volts. These units utilize vacuum contractors for switching with separate compartments so as to accomplish power switching and control.
In places where really corrosive or dusty methods are occurring, the motor control center could be established in a separate air-conditioned room. Normally the MCC would be situated on the factory floor close to the machinery 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 can be unplugged from the cabinet so as to complete testing or maintenance, whereas very big controllers could be bolted in place. Each and every motor controller consists of a contractor or a solid state motor controller, overload relays to protect the motor, fuses or circuit breakers to supply short-circuit protection and 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 located in the controller. Motor control centers offer wire ways for power cables and field control.
Each motor controller inside a motor control center could be specified with a range of choices. These alternatives include: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and many kinds of bi-metal and solid-state overload protection relays. They likewise comprise different classes of types of circuit breakers and power fuses.
