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In factory assembly for motor starter; motor control centers are fairly common method. The MCC's comprise variable frequency drives, programmable controllers and metering. The MCC's are usually used in the electrical service entrance for a building. Motor control centers frequently are used for low voltage, 3-phase alternating current motors that range from 230 V to 600V. Medium voltage motor control centers are designed for big motors which range from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments in order to achieve power switching and control.
In areas where really dusty or corrosive processes are taking place, the motor control center may be established in a separate air-conditioned room. Usually the MCC would be located on the factory floor near the equipment 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. In order to complete testing or maintenance, really big controllers can be bolted into place, whereas smaller controllers may be unplugged from the cabinet. Each motor controller has a solid state motor controller or a contractor, overload relays so as to protect the motor, circuit breaker or fuses to provide short-circuit protection and a disconnecting switch in order to isolate the motor circuit. Separate connectors allow 3-phase power so as to enter the controller. The motor is wired to terminals situated in the controller. Motor control centers provide wire ways for field control and power cables.
Every motor controller within a motor control center could be specified with various options. These choices consist of: pilot lamps, separate control transformers, extra control terminal blocks, control switches, as well as numerous types of bi-metal and solid-state overload protection relays. They even have different classes of types of power fuses and circuit breakers.
