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Motor Control Centers or otherwise called MCC's, are an assembly of one or more enclosed sections, which have a common power bus mainly comprising motor control units. They have been utilized ever since the 1950's by the vehicle trade, for the reason that they utilized a large number of electric motors. Today, they are utilized in other commercial and industrial applications.
Motor control centers are a modern practice in factory assembly for several motor starters. This machinery can include variable frequency drives, programmable controllers and metering. The MCC's are commonly used in the electrical service entrance for a building. Motor control centers frequently are utilized for low voltage, 3-phase alternating current motors that range from 230 volts to 600 volts. Medium voltage motor control centers are intended for big motors that vary from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments in order to attain power switching and control.
In areas where very dusty or corrosive methods are happening, the motor control center can be installed in a separate air-conditioned room. Normally the MCC would be positioned on the factory floor adjacent 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. In order to complete maintenance or testing, very large controllers can be bolted into place, whereas smaller controllers may be unplugged from the cabinet. Every motor controller has a solid state motor controller or a contractor, overload relays so as to protect the motor, fuses or circuit breakers to be able to provide short-circuit protection and a disconnecting switch to be able to isolate the motor circuit. Separate connectors enable 3-phase power to be able to enter the controller. The motor is wired to terminals located in the controller. Motor control centers offer wire ways for power cables and field control.
Each and every motor controller inside a motor control center could be specified with different choices. These choices consist of: separate control transformers, extra control terminal blocks, control switches, pilot lamps, as well as various types of solid-state and bi-metal overload protection relays. They even have different classes of kinds of circuit breakers and power fuses.
Regarding the delivery of motor control centers, there are many 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 supplied ready for the customer to connect all field wiring.
Motor control centers normally sit on the floor and must have a fire-resistance rating. Fire stops may be necessary for cables which penetrate fire-rated floors and walls.
