Forklift Drive Motor - Motor Control Centers or MCC's, are an assembly of one enclosed section or more, that have a common power bus principally comprising motor control units. They have been utilized since the 1950's by the automobile trade, since they utilized a large number of electric motors. Now, they are utilized in a variety of commercial and industrial applications.
Inside factory assembly for motor starter; motor control centers are fairly common method. The MCC's comprise variable frequency drives, programmable controllers and metering. The MCC's are usually utilized in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors which range from 230 V to 600V. Medium voltage motor control centers are intended for large motors that vary from 2300V to 15000 V. These units make use of vacuum contractors for switching with separate compartments in order to attain power switching and control.
In factory locations and area 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 equipment 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 so as to complete maintenance or testing, while extremely large controllers can be bolted in place. Every motor controller has 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 in order to isolate the motor circuit. Separate connectors allow 3-phase power so as to enter the controller. The motor is wired to terminals positioned within the controller. Motor control centers supply wire ways for field control and power cables.
Inside a motor control center, every motor controller can be specified with several different alternatives. Some of the alternatives consist of: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and numerous kinds of solid-state and bi-metal overload protection relays. They also comprise various classes of types of circuit breakers and power fuses.
Concerning the delivery of motor control centers, there are a lot of choices for the client. These could be delivered as an engineered assembly with a programmable controller along with internal control or with interlocking wiring to a central control terminal panel board. On the other hand, they could be supplied ready for the client to connect all field wiring.
MCC's usually sit on floors which should have a fire-resistance rating. Fire stops could be necessary for cables that penetrate fire-rated walls and floors.
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