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Motor control centers are a modern method in factory assembly for some motor starters. This particular machine can include variable frequency drives, programmable controllers and metering. The MCC's are usually found in the electrical service entrance for a building. Motor control centers often are utilized for low voltage, 3-phase alternating current motors which range from 230 volts to 600 volts. Medium voltage motor control centers are designed for large motors that vary from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments so as to attain power control and switching.
Within factory area and locations which have dusty or corrosive processing, the MCC can be installed in climate controlled separated locations. Typically the MCC would be positioned on the factory floor near 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 large controllers could be bolted into place, while smaller controllers could be unplugged from the cabinet. Each motor controller consists of a contractor or a solid state motor controller, overload relays to be able to protect the motor, circuit breaker or fuses to supply 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 situated within the controller. Motor control centers supply wire ways for power cables and field control.
Each motor controller inside a motor control center could be specified with a range of alternatives. These choices consist of: pilot lamps, separate control transformers, extra control terminal blocks, control switches, as well as numerous types of solid-state and bi-metal overload protection relays. They also have various classes of types of circuit breakers and power fuses.