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Motor control centers are a modern practice in factory assembly for some motor starters. This particular machine can include programmable controllers, metering and variable frequency drives. The MCC's are usually found in the electrical service entrance for a building. Motor control centers frequently are utilized for low voltage, 3-phase alternating current motors which vary from 230 volts to 600 volts. Medium voltage motor control centers are designed for large motors which vary from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments to be able to achieve power switching and control.
In areas where very corrosive or dusty methods are occurring, the motor control center may be installed in a separate air-conditioned room. Normally the MCC will be located on the factory floor near the machinery it is controlling.
A MCC has one or more vertical metal cabinet sections with power bus and provisions for plug-in mounting of individual motor controllers. Smaller controllers may be unplugged from the cabinet to be able to complete maintenance or testing, whereas extremely big controllers can be bolted in place. Each and every motor controller consists of a contractor or a solid state motor controller, overload relays to protect the motor, circuit breaker or fuses so as to supply short-circuit protection as well as a disconnecting switch in order to isolate the motor circuit. Separate connectors allow 3-phase power to enter the controller. The motor is wired to terminals positioned within the controller. Motor control centers offer wire ways for power cables and field control.
Within a motor control center, every motor controller could be specified with a lot of various alternatives. Some of the options comprise: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and many kinds of bi-metal and solid-state overload protection relays. They likewise comprise different classes of kinds of power fuses and circuit breakers.
