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Motor Control Centers or MCC's, are an assembly of one enclosed section or more, which have a common power bus mainly containing motor control units. They have been utilized ever since the 1950's by the automobile business, as they used a large number of electric motors. Today, they are used in a variety of commercial and industrial applications.
Motor control centers are a modern method in factory assembly for several motor starters. This particular machine could consist of variable frequency drives, programmable controllers and metering. The MCC's are commonly utilized in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors which range from 230 volts to 600 volts. Medium voltage motor control centers are designed for large motors which range from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments to be able to attain power control and switching.
In factory locations and area which have corrosive or dusty processing, the MCC can be installed in climate controlled separated locations. Normally the MCC would be located on the factory floor adjacent to 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. To be able to complete testing or maintenance, extremely big controllers can be bolted into place, whereas smaller controllers can 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, fuses or circuit breakers in order to provide short-circuit protection and 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 located within the controller. Motor control centers supply wire ways for power cables and field control.
In a motor control center, each and every motor controller can be specified with many various choices. Some of the options consist of: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and many kinds of bi-metal and solid-state overload protection relays. They likewise have different classes of kinds of circuit breakers and power fuses.
There are numerous alternatives concerning delivery of MCC's to the customer. They could be delivered as an engineered assembly with interlocking wiring to a central control terminal panel board or programmable controller together with internal control. On the other hand, they can be supplied ready for the customer to connect all field wiring.
MCC's commonly sit on floors which should have a fire-resistance rating. Fire stops could be required for cables which go through fire-rated walls and floors.
