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Motor Control Centers or likewise called MCC's, are an assembly of one or more enclosed sections, that have a common power bus mostly consisting of motor control units. They have been used ever since the 1950's by the vehicle industry, because they made use of lots of electric motors. Nowadays, they are utilized in different industrial and commercial applications.
Motor control centers are a modern practice in factory assembly for some motor starters. This equipment can include variable frequency drives, programmable controllers and metering. The MCC's are usually found in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors that vary from 230 volts to 600 volts. Medium voltage motor control centers are intended for big motors which range from 2300 volts to 15000 volts. These units utilize vacuum contractors for switching with separate compartments so as to accomplish power switching and control.
Inside factory locations and area that have dusty or corrosive processing, the MCC could be installed in climate controlled separated locations. Normally the MCC would be situated on the factory floor next to the machinery 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. To complete testing or maintenance, extremely large controllers could be bolted into place, while smaller controllers could be unplugged from the cabinet. Every motor controller has a solid state motor controller or a contractor, overload relays to protect the motor, fuses or circuit breakers to be able to provide short-circuit protection and 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 situated within the controller. Motor control centers provide wire ways for power cables and field control.
Every motor controller in a motor control center could be specified with different options. These choices include: separate control transformers, extra control terminal blocks, control switches, pilot lamps, as well as numerous kinds of solid-state and bi-metal overload protection relays. They also comprise various classes of types of power fuses and circuit breakers.
There are various alternatives regarding delivery of MCC's to the client. They could be delivered as an engineered assembly with interlocking wiring to a central control terminal panel board or programmable controller along with internal control. Conversely, they could be supplied set for the customer to connect all field wiring.
MCC's commonly sit on floors which should have a fire-resistance rating. Fire stops may be required for cables which penetrate fire-rated floors and walls.
