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Motor Control Centers or MCC's, are an assembly of one enclosed section or more, that have a common power bus mainly consisting of motor control units. They have been utilized since the 1950's by the automobile business, since they utilized lots of electric motors. Nowadays, they are utilized in other industrial and commercial applications.
Inside factory assembly for motor starter; motor control centers are fairly common method. The MCC's 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 used for low voltage, 3-phase alternating current motors that vary from 230 volts to 600 volts. Medium voltage motor control centers are made for big motors that vary from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments in order to attain power switching and control.
Inside factory area and locations which have dusty or corrosive processing, the MCC can be installed in climate controlled separated locations. Normally the MCC would be situated on the factory floor near 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. So as to complete testing or maintenance, very big controllers can be bolted into place, whereas smaller controllers can be unplugged from the cabinet. Every motor controller consists of a solid state motor controller or a contractor, overload relays to protect the motor, fuses or circuit breakers in order to supply short-circuit protection as well as a disconnecting switch to be able to isolate the motor circuit. Separate connectors allow 3-phase power so as to enter the controller. The motor is wired to terminals situated inside the controller. Motor control centers offer wire ways for power cables and field control.
Each motor controller inside a motor control center could be specified with different options. These options consist of: separate control transformers, extra control terminal blocks, control switches, pilot lamps, and various types of solid-state and bi-metal overload protection relays. They likewise have various classes of kinds of power fuses and circuit breakers.
There are various alternatives regarding delivery of MCC's to the customer. They can be delivered as an engineered assembly with interlocking wiring to a central control terminal panel board or programmable controller together with internal control. Conversely, they can be provided ready for the customer to connect all field wiring.
Motor control centers normally sit on the floor and must have a fire-resistance rating. Fire stops may be necessary for cables which penetrate fire-rated walls and floors.
