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Motor control centers are a modern practice in factory assembly for some motor starters. This equipment could comprise variable frequency drives, programmable controllers and metering. The MCC's are commonly seen in the electrical service entrance for a building. Motor control centers often are used for low voltage, 3-phase alternating current motors which range from 230 volts to 600 volts. Medium voltage motor control centers are intended for big motors which range from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments so as to attain power control and switching.
In places where extremely corrosive or dusty methods are taking place, the motor control center could be installed in a separate air-conditioned room. Normally the MCC will be situated on the factory floor adjacent 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. So as to complete maintenance or testing, extremely big controllers could be bolted into place, whereas smaller controllers may be unplugged from the cabinet. Each motor controller consists of a solid state motor controller or a contractor, overload relays In order to protect the motor, circuit breaker or fuses to provide short-circuit protection and a disconnecting switch to be able to isolate the motor circuit. Separate connectors allow 3-phase power to be able to enter the controller. The motor is wired to terminals located in the controller. Motor control centers provide wire ways for field control and power cables.
Inside a motor control center, each and every motor controller could be specified with lots of various alternatives. Some of the choices include: 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 kinds of circuit breakers and power fuses.
