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In factory assembly for motor starter; motor control centers are fairly common practice. The MCC's comprise programmable controllers, metering and variable frequency drives. The MCC's are usually found in the electrical service entrance for a building. Motor control centers often are used for low voltage, 3-phase alternating current motors which range from 230 volts to 600 volts. Medium voltage motor control centers are designed for big motors that range from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments in order to accomplish power control and switching.
Within factory locations and area that have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Normally the MCC would be positioned on the factory floor close 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, extremely big controllers could be bolted into place, whereas smaller controllers could be unplugged from the cabinet. Each and every motor controller has a contractor or a solid state motor controller, overload relays to protect the motor, circuit breaker or fuses so as to provide short-circuit protection as well as a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals situated in the controller. Motor control centers offer wire ways for power cables and field control.
In a motor control center, each motor controller can be specified with numerous various options. Some of the alternatives include: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and various types of bi-metal and solid-state overload protection relays. They even have various classes of types of circuit breakers and power fuses.
