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Motor control centers are a modern method in factory assembly for several motor starters. This particular equipment could comprise variable frequency drives, programmable controllers and metering. The MCC's are commonly seen in the electrical service entrance for a building. Motor control centers frequently are utilized for low voltage, 3-phase alternating current motors which range from 230 volts to 600 volts. Medium voltage motor control centers are made for large motors that range from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments so as to achieve power control and switching.
Inside factory area and locations that have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Normally the MCC will 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. So as to complete testing or maintenance, very large controllers could be bolted into place, whereas smaller controllers could be unplugged from the cabinet. Every motor controller has a solid state motor controller or a contractor, overload relays to be able to protect the motor, circuit breaker or fuses to provide short-circuit protection and a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power in order to enter the controller. The motor is wired to terminals located within the controller. Motor control centers provide wire ways for field control and power cables.
In a motor control center, each motor controller could be specified with lots of various options. Some of the alternatives include: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and various kinds of solid-state and bi-metal overload protection relays. They also comprise various classes of kinds of power fuses and circuit breakers.
