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In factory assembly for motor starter; motor control centers are fairly common practice. The MCC's consist of programmable controllers, metering and variable frequency drives. The MCC's are normally found in the electrical service entrance for a building. Motor control centers often are used for low voltage, 3-phase alternating current motors that range from 230 volts to 600 volts. Medium voltage motor control centers are made for big motors that vary from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments so as to attain power switching and control.
In areas where extremely corrosive or dusty methods are occurring, the motor control center can be established in a separate air-conditioned room. Normally the MCC will be situated on the factory floor adjacent to the machines 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 big controllers could be bolted into place, while smaller controllers can be unplugged from the cabinet. Each and every motor controller consists of a solid state motor controller or a contractor, overload relays to protect the motor, circuit breaker or fuses to supply short-circuit protection as well as a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power to be able to enter the controller. The motor is wired to terminals positioned within the controller. Motor control centers provide wire ways for field control and power cables.
Within a motor control center, every motor controller could be specified with numerous different options. Some of the options include: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and many types of bi-metal and solid-state overload protection relays. They likewise have various classes of types of circuit breakers and power fuses.
