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Inside factory assembly for motor starter; motor control centers are fairly common method. The MCC's consist of variable frequency drives, programmable controllers and metering. The MCC's are commonly used in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors that vary from 230 volts to 600 volts. Medium voltage motor control centers are designed for big motors which range from 2300V to 15000 V. These units make use of vacuum contractors for switching with separate compartments so as to achieve power control and switching.
In factory locations and area which have dusty or corrosive processing, the MCC can be installed in climate controlled separated locations. Usually the MCC would be situated on the factory floor next to the machines 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. To complete testing or maintenance, very large controllers can be bolted into place, while smaller controllers can be unplugged from the cabinet. Each motor controller consists of a contractor or a solid state motor controller, overload relays to protect the motor, circuit breaker or fuses to supply short-circuit protection and a disconnecting switch in order to isolate the motor circuit. Separate connectors allow 3-phase power to enter the controller. The motor is wired to terminals situated in the controller. Motor control centers offer wire ways for field control and power cables.
Each and every motor controller inside a motor control center could be specified with a range of alternatives. These options include: separate control transformers, extra control terminal blocks, control switches, pilot lamps, as well as many types of solid-state and bi-metal overload protection relays. They also comprise various classes of types of circuit breakers and power fuses.
