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Motor control centers are a modern method in factory assembly for several motor starters. This particular machine could comprise metering, variable frequency drives and programmable controllers. The MCC's are commonly utilized in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors which vary from 230 V to 600V. Medium voltage motor control centers are made for big motors which vary from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments to be able to achieve power control and switching.
In factory locations and area which have dusty or corrosive processing, the MCC can be installed in climate controlled separated locations. Normally the MCC would be located on the factory floor next to the equipment 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 can be unplugged from the cabinet to complete testing or maintenance, whereas very big controllers can be bolted in place. Each motor controller consists of a solid state motor controller or a contractor, overload relays 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 inside the controller. Motor control centers provide wire ways for field control and power cables.
Every motor controller in a motor control center can be specified with several options. These alternatives consist of: separate control transformers, extra control terminal blocks, control switches, pilot lamps, as well as numerous types of bi-metal and solid-state overload protection relays. They likewise have different classes of types of power fuses and circuit breakers.
