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MCC's or likewise known as Motor Control Centersare an assembly of one section or more which include a common power bus. These have been utilized in the vehicle trade since the 1950's, since they were used lots of electric motors. Nowadays, they are used in a variety of commercial and industrial applications.
Inside factory assembly for motor starter; motor control centers are rather common practice. 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 used 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 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 area and locations that have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Typically the MCC would be positioned on the factory floor close 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, really large controllers could be bolted into place, whereas smaller controllers can be unplugged from the cabinet. Every motor controller has a contractor or a solid state motor controller, overload relays In order to protect the motor, circuit breaker or fuses in order to supply short-circuit protection and a disconnecting switch to be able to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals positioned in the controller. Motor control centers provide wire ways for power cables and field control.
Every motor controller within a motor control center can be specified with a range of alternatives. These choices include: extra control terminal blocks, control switches, pilot lamps, separate control transformers, as well as various kinds of solid-state and bi-metal overload protection relays. They also have different classes of kinds of power fuses and circuit breakers.
There are several alternatives concerning delivery of MCC's to the client. They can be delivered as an engineered assembly with interlocking wiring to a central control terminal panel board or programmable controller along with internal control. On the other hand, they can be supplied prepared for the client to connect all field wiring.
Motor control centers normally sit on the floor and should have a fire-resistance rating. Fire stops may be needed for cables that go through fire-rated floors and walls.
