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Motor control centers are a modern method in factory assembly for some motor starters. This machine can include programmable controllers, metering and variable frequency drives. The MCC's are usually found in the electrical service entrance for a building. Motor control centers frequently are used for low voltage, 3-phase alternating current motors which vary from 230 V to 600V. Medium voltage motor control centers are made for large motors which vary from 2300V to 15000 V. These units make use of vacuum contractors for switching with separate compartments so as to achieve power control and switching.
In locations where very dusty or corrosive processes are happening, the motor control center can be established in a separate air-conditioned room. Normally the MCC will be situated on the factory floor close to the machines 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 in order to complete maintenance or testing, while really big controllers could be bolted in place. Every motor controller consists of a solid state motor controller or a contractor, overload relays to protect the motor, fuses or circuit breakers to provide short-circuit protection as well as 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 located within the controller. Motor control centers offer wire ways for field control and power cables.
Each motor controller in a motor control center could be specified with a range of alternatives. These choices comprise: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and numerous types of bi-metal and solid-state overload protection relays. They also comprise various classes of kinds of circuit breakers and power fuses.
