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Motor control centers are a modern practice in factory assembly for several motor starters. This machinery could consist of metering, variable frequency drives and programmable controllers. The MCC's are usually seen in the electrical service entrance for a building. Motor control centers often are utilized 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 range from 2300 volts to 15000 volts. These units make use of vacuum contractors for switching with separate compartments to be able to achieve power control and switching.
In areas where really dusty or corrosive processes are happening, the motor control center may be established in a separate air-conditioned room. Usually the MCC will be situated on the factory floor adjacent to the machinery it is controlling.
A MCC has one or more vertical metallic cabinet sections with power bus and provisions for plug-in mounting of individual motor controllers. Smaller controllers may be unplugged from the cabinet in order to complete testing or maintenance, while really big controllers can be bolted in place. Each and every motor controller has a contractor or a solid state motor controller, overload relays to be able 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 be able to enter the controller. The motor is wired to terminals positioned inside the controller. Motor control centers provide wire ways for power cables and field control.
Each motor controller in a motor control center could be specified with various choices. These choices consist of: control switches, pilot lamps, separate control transformers, extra control terminal blocks, and numerous kinds of solid-state and bi-metal overload protection relays. They likewise have various classes of types of power fuses and circuit breakers.
