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MCC's or Motor Control Centersare an assembly of one or more sections which include a common power bus. These have been used in the auto trade since the 1950's, since they were used a large number of electric motors. Today, they are used in various industrial and commercial applications.
Motor control centers are a modern practice in factory assembly for several motor starters. This machine could consist of programmable controllers, metering and variable frequency drives. The MCC's are usually found in the electrical service entrance for a building. Motor control centers often are used 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 which vary from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments in order to accomplish power switching and control.
In areas where very corrosive or dusty processes are occurring, the motor control center can be established in a separate air-conditioned room. Normally the MCC will 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 testing or maintenance, very large controllers can be bolted into place, whereas smaller controllers can be unplugged from the cabinet. Each motor controller has a contractor or a solid state motor controller, overload relays so as to protect the motor, circuit breaker or fuses in order to provide short-circuit protection as well as 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 positioned inside the controller. Motor control centers offer wire ways for field control and power cables.
Inside a motor control center, each motor controller can be specified with lots of various choices. Some of the options include: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and various types of solid-state and bi-metal overload protection relays. They also comprise various classes of kinds of power fuses and circuit breakers.
Concerning the delivery of motor control centers, there are many alternatives for the consumer. 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. Conversely, they can be provided prepared for the client to connect all field wiring.
MCC's generally sit on floors that are required to have a fire-resistance rating. Fire stops can be necessary for cables that go through fire-rated walls and floors.
