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MCC's or likewise known as Motor Control Centersare an assembly of one section or more which have a common power bus. These have been utilized in the vehicle trade since the 1950's, for the reason that they were made use of lots of electric motors. Today, they are utilized in different commercial and industrial applications.
Motor control centers are a modern technique in factory assembly for several motor starters. This machine can comprise metering, variable frequency drives and programmable controllers. The MCC's are commonly utilized 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 intended for big motors which vary from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments so as to achieve power control and switching.
Within factory area and locations which 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 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 complete testing or maintenance, extremely large controllers can be bolted into place, while smaller controllers could be unplugged from the cabinet. Each and every motor controller consists of 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 as well as a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power so as to enter the controller. The motor is wired to terminals located inside the controller. Motor control centers supply wire ways for field control and power cables.
Inside a motor control center, each and every motor controller can be specified with lots of various choices. Some of the alternatives comprise: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and various types of solid-state and bi-metal overload protection relays. They also have different classes of types of power fuses and circuit breakers.
Concerning the delivery of motor control centers, there are numerous choices for the customer. These could be delivered as an engineered assembly with a programmable controller along with internal control or with interlocking wiring to a central control terminal panel board. Conversely, they could be supplied set for the customer to connect all field wiring.
Motor control centers normally sit on the floor and should have a fire-resistance rating. Fire stops can be required for cables which go through fire-rated floors and walls.
