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Inside factory assembly for motor starter; motor control centers are quite common technique. The MCC's consist of variable frequency drives, programmable controllers and metering. The MCC's are commonly seen in the electrical service entrance for a building. Motor control centers frequently are utilized for low voltage, 3-phase alternating current motors which range from 230 volts to 600 volts. Medium voltage motor control centers are intended for large motors which range from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments to be able to achieve power switching and control.
Within factory locations and area that have dusty or corrosive processing, the MCC could be installed in climate controlled separated locations. Usually the MCC will be positioned on the factory floor close 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 testing or maintenance, really big controllers can be bolted into place, whereas smaller controllers could be unplugged from the cabinet. Each motor controller consists of a solid state motor controller or a contractor, overload relays to protect the motor, fuses or circuit breakers to supply short-circuit protection as well as a disconnecting switch to be able to isolate the motor circuit. Separate connectors allow 3-phase power so as to enter the controller. The motor is wired to terminals situated within the controller. Motor control centers provide wire ways for power cables and field control.
Each and every motor controller inside a motor control center could be specified with a range of options. These options include: separate control transformers, extra control terminal blocks, control switches, pilot lamps, as well as many types of bi-metal and solid-state overload protection relays. They even comprise various classes of types of circuit breakers and power fuses.