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In factory assembly for motor starter; motor control centers are quite common practice. The MCC's include programmable controllers, metering and variable frequency drives. The MCC's are commonly 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 V to 600V. Medium voltage motor control centers are made for big motors that vary from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments to be able to attain power switching and control.
In factory locations and area that have dusty or corrosive processing, the MCC can be installed in climate controlled separated locations. Normally the MCC will be positioned on the factory floor next to the machinery it is controlling.
A MCC has one or more vertical metallic cabinet sections with power bus and provisions for plug-in mounting of individual motor controllers. Smaller controllers could be unplugged from the cabinet to complete maintenance or testing, whereas very big controllers could be bolted in place. Each and every motor controller has a solid state motor controller or a contractor, overload relays to protect the motor, circuit breaker or fuses to be able to provide short-circuit protection and a disconnecting switch so as to isolate the motor circuit. Separate connectors allow 3-phase power to enter the controller. The motor is wired to terminals situated inside 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 options. These alternatives consist of: separate control transformers, extra control terminal blocks, control switches, pilot lamps, as well as numerous types of solid-state and bi-metal overload protection relays. They also have different classes of kinds of circuit breakers and power fuses.
