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Motor control centers are a modern technique in factory assembly for some motor starters. This equipment can comprise programmable controllers, metering and variable frequency drives. The MCC's are commonly seen in the electrical service entrance for a building. Motor control centers frequently are used for low voltage, 3-phase alternating current motors that vary from 230 volts to 600 volts. Medium voltage motor control centers are intended for big motors which vary from 2300V to 15000 V. These units make use of vacuum contractors for switching with separate compartments in order to achieve power switching and control.
Inside factory area and locations that have dusty or corrosive processing, the MCC could be installed in climate controlled separated locations. Usually the MCC would be situated on the factory floor close to the machinery 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 big controllers could be bolted into place, whereas smaller controllers may be unplugged from the cabinet. Every motor controller consists of a contractor or a solid state motor controller, overload relays to be able to protect the motor, fuses or circuit breakers to provide short-circuit protection and a disconnecting switch to be able to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals situated inside the controller. Motor control centers provide wire ways for field control and power cables.
Every motor controller in a motor control center can be specified with different choices. These options comprise: control switches, pilot lamps, separate control transformers, extra control terminal blocks, and numerous types of bi-metal and solid-state overload protection relays. They also comprise different classes of kinds of circuit breakers and power fuses.
