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MCC's or also known as Motor Control Centersare an assembly of one section or more which contain a common power bus. These have been utilized in the auto industry ever since the 1950's, for the reason that they were made use of a lot of electric motors. Nowadays, they are utilized in a variety of commercial and industrial applications.
Within factory assembly for motor starter; motor control centers are somewhat common practice. The MCC's consist of programmable controllers, metering and variable frequency drives. The MCC's are commonly seen 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 V to 600V. Medium voltage motor control centers are designed for large motors which vary from 2300V to 15000 V. These units make use of vacuum contractors for switching with separate compartments so as to attain power control and switching.
Inside factory locations and area which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Typically the MCC will be positioned on the factory floor close to 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. In order to complete testing or maintenance, very large controllers could be bolted into place, whereas smaller controllers may be unplugged from the cabinet. Every motor controller consists of a solid state motor controller or a contractor, overload relays so as to protect the motor, circuit breaker or fuses so as to supply short-circuit protection and 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 positioned within the controller. Motor control centers offer wire ways for field control and power cables.
Each motor controller in a motor control center can be specified with several choices. These 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.
Regarding the delivery of motor control centers, there are various options for the client. These can be delivered as an engineered assembly with a programmable controller together with internal control or with interlocking wiring to a central control terminal panel board. On the other hand, they could be supplied set for the customer to connect all field wiring.
MCC's usually sit on floors which must have a fire-resistance rating. Fire stops may be necessary for cables that go through fire-rated floors and walls.
