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MCC's or also known as Motor Control Centersare an assembly of one or more sections that contain a common power bus. These have been used in the automobile business ever since the 1950's, in view of the fact that they were made use of a large number of electric motors. These days, they are used in various commercial and industrial applications.
Within 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 usually used in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors which vary from 230 V to 600V. Medium voltage motor control centers are intended for big motors which vary from 2300 volts to 15000 volts. These units utilize vacuum contractors for switching with separate compartments in order to attain power control and switching.
In areas where very dusty or corrosive processes are taking place, the motor control center may be established in a separate air-conditioned room. Normally the MCC will be situated on the factory floor near the machines it is controlling.
A MCC has one or more vertical metal 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, while really big controllers could be bolted in place. Each and every motor controller has a contractor or a solid state motor controller, overload relays to be able to protect the motor, fuses or circuit breakers 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 positioned in the controller. Motor control centers supply wire ways for field control and power cables.
Within a motor control center, every motor controller can be specified with many different choices. Some of the choices consist of: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and numerous kinds of solid-state and bi-metal overload protection relays. They even have different classes of kinds of power fuses and circuit breakers.
There are lots of choices regarding delivery of MCC's to the client. 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 provided set 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 could be necessary for cables which go through fire-rated floors and walls.
