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Motor Control Centers or MCC's, are an assembly of one or more enclosed sections, which have a common power bus mostly comprising motor control units. They have been utilized ever since the 1950's by the vehicle business, since they utilized lots of electric motors. Today, they are used in a variety of commercial and industrial applications.
Inside factory assembly for motor starter; motor control centers are fairly common technique. The MCC's comprise metering, variable frequency drives and programmable controllers. The MCC's are normally used in the electrical service entrance for a building. Motor control centers often 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 large motors which range from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments to be able to achieve power control and switching.
In places where really dusty or corrosive methods are occurring, the motor control center can be established in a separate air-conditioned room. Usually the MCC will be located on the factory floor near the machines 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 large controllers can be bolted into place, whereas smaller controllers may be unplugged from the cabinet. Each and every motor controller consists of a solid state motor controller or a contractor, overload relays to be able to protect the motor, circuit breaker or fuses so as to supply short-circuit protection and a disconnecting switch so as to isolate the motor circuit. Separate connectors allow 3-phase power to be able to enter the controller. The motor is wired to terminals situated inside the controller. Motor control centers provide wire ways for power cables and field control.
Each and every motor controller within a motor control center can be specified with various options. These options include: pilot lamps, separate control transformers, extra control terminal blocks, control switches, as well as various types of solid-state and bi-metal overload protection relays. They even have various classes of types of circuit breakers and power fuses.
There are many choices concerning 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 along with internal control. On the other hand, they can be supplied prepared for the customer to connect all field wiring.
MCC's commonly sit on floors that are required to have a fire-resistance rating. Fire stops may be needed for cables that penetrate fire-rated floors and walls.
