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Motor Control Centers or also called MCC's, are an assembly of one enclosed section or more, that have a common power bus principally containing motor control units. They have been utilized ever since the 1950's by the vehicle trade, for the reason that they used a large number of electric motors. Nowadays, they are utilized in a variety of commercial and industrial applications.
Within factory assembly for motor starter; motor control centers are rather common technique. The MCC's consist of variable frequency drives, programmable controllers and metering. The MCC's are normally seen in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors that range from 230 V to 600V. Medium voltage motor control centers are designed for large motors which vary from 2300 volts to 15000 volts. These units utilize vacuum contractors for switching with separate compartments to be able to accomplish power control and switching.
Inside factory locations and area which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Normally the MCC will be situated on the factory floor near the machinery 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 may be unplugged from the cabinet in order to complete testing or maintenance, whereas really large controllers can be bolted in place. Each and every motor controller has a contractor or a solid state motor controller, overload relays so as to protect the motor, fuses or circuit breakers so as to provide short-circuit protection as well as a disconnecting switch in order to isolate the motor circuit. Separate connectors allow 3-phase power to be able to enter the controller. The motor is wired to terminals situated in the controller. Motor control centers provide wire ways for power cables and field control.
In a motor control center, every motor controller can be specified with many various options. Some of the choices comprise: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and numerous kinds of bi-metal and solid-state overload protection relays. They likewise have various classes of kinds of circuit breakers and power fuses.
There are several choices 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. On the other hand, they could be supplied ready for the customer to connect all field wiring.
Motor control centers usually sit on the floor and must have a fire-resistance rating. Fire stops may be necessary for cables which go through fire-rated floors and walls.
