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Motor Control Centers or also called MCC's, are an assembly of one or more enclosed sections, which have a common power bus principally consisting of motor control units. They have been used ever since the 1950's by the vehicle business, for the reason that they made use of a large number of electric motors. Nowadays, they are used in a variety of commercial and industrial applications.
In factory assembly for motor starter; motor control centers are somewhat common practice. The MCC's comprise metering, variable frequency drives and programmable controllers. The MCC's are commonly seen in the electrical service entrance for a building. Motor control centers often 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 large motors which vary from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments so as to accomplish power control and switching.
Within factory locations and area which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Usually the MCC will be situated on the factory floor next 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. So as to complete testing or maintenance, very big controllers can be bolted into place, whereas smaller controllers could be unplugged from the cabinet. Each motor controller has a solid state motor controller or a contractor, overload relays to protect the motor, circuit breaker or fuses to provide short-circuit protection and a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals located in the controller. Motor control centers supply wire ways for field control and power cables.
Each and every motor controller inside a motor control center can be specified with several choices. These alternatives consist of: 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 different classes of types of circuit breakers and power fuses.
Concerning the delivery of motor control centers, there are numerous alternatives for the customer. 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. On the other hand, they can be supplied prepared for the client to connect all field wiring.
Motor control centers typically sit on the floor and should have a fire-resistance rating. Fire stops could be necessary for cables which penetrate fire-rated walls and floors.
