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Motor Control Centers or MCC's, are an assembly of one or more enclosed sections, that have a common power bus principally comprising motor control units. They have been utilized ever since the 1950's by the auto business, since they made use of a lot of electric motors. Nowadays, they are used in different commercial and industrial applications.
Motor control centers are a modern technique in factory assembly for some motor starters. This equipment can consist of metering, variable frequency drives and programmable controllers. The MCC's are usually utilized in the electrical service entrance for a building. Motor control centers frequently are used for low voltage, 3-phase alternating current motors that vary from 230 V to 600V. Medium voltage motor control centers are designed for large motors that vary from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments so as to achieve power switching and control.
Inside factory area and locations which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Usually the MCC would be situated 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. So as to complete maintenance or testing, very large controllers could be bolted into place, while smaller controllers can be unplugged from the cabinet. Each motor controller consists of a contractor or a solid state motor controller, overload relays to protect the motor, fuses or circuit breakers in order to provide short-circuit protection as well as a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power so as to enter the controller. The motor is wired to terminals positioned inside the controller. Motor control centers offer wire ways for power cables and field control.
Each motor controller in a motor control center can be specified with different choices. These choices include: extra control terminal blocks, control switches, pilot lamps, separate control transformers, as well as many kinds of solid-state and bi-metal overload protection relays. They even comprise various classes of kinds of circuit breakers and power fuses.
Regarding the delivery of motor control centers, there are lots of alternatives for the customer. These can be delivered as an engineered assembly with a programmable controller along with internal control or with interlocking wiring to a central control terminal panel board. Conversely, they can be provided prepared for the customer 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 which go through fire-rated walls and floors.
