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Motor Control Centers or likewise called MCC's, are an assembly of one or more enclosed sections, which have a common power bus mostly containing motor control units. They have been utilized since the 1950's by the automobile trade, as they made use of lots of electric motors. Nowadays, they are utilized in different commercial and industrial applications.
Motor control centers are a modern practice in factory assembly for several motor starters. This particular machine can comprise programmable controllers, metering and variable frequency drives. The MCC's are commonly 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 volts to 600 volts. Medium voltage motor control centers are intended for big motors that vary from 2300V to 15000 V. These units make use of vacuum contractors for switching with separate compartments so as to achieve power switching and control.
Inside factory locations and area that have corrosive or dusty processing, the MCC can be installed in climate controlled separated locations. Usually the MCC will be situated on the factory floor adjacent to the machines it is controlling.
A MCC has one or more vertical metallic cabinet sections with power bus and provisions for plug-in mounting of individual motor controllers. Smaller controllers could be unplugged from the cabinet in order to complete testing or maintenance, while really large controllers can be bolted in place. Each and every motor controller has a solid state motor controller or a contractor, overload relays to protect the motor, circuit breaker or fuses so as to provide 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 situated inside the controller. Motor control centers offer wire ways for power cables and field control.
Every motor controller in a motor control center could be specified with different choices. These options include: separate control transformers, extra control terminal blocks, control switches, pilot lamps, and numerous kinds of bi-metal and solid-state overload protection relays. They also comprise different classes of types of power fuses and circuit breakers.
There are a lot of options regarding 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 together with internal control. On the other hand, they could be supplied prepared for the client to connect all field wiring.
MCC's generally sit on floors that should have a fire-resistance rating. Fire stops can be needed for cables which go through fire-rated floors and walls.
