Drive Motor for Forklifts - Motor Control Centers or also called MCC's, are an assembly of one or more enclosed sections, that have a common power bus principally consisting of motor control units. They have been utilized ever since the 1950's by the automobile industry, for the reason that they utilized lots of electric motors. These days, they are used in different industrial and commercial applications.
Within factory assembly for motor starter; motor control centers are fairly common practice. The MCC's consist of variable frequency drives, programmable controllers and metering. The MCC's are normally found in the electrical service entrance for a building. Motor control centers often are used for low voltage, 3-phase alternating current motors that range from 230 V to 600V. Medium voltage motor control centers are designed for large motors that range from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments so as to accomplish power switching and control.
In areas where very dusty or corrosive methods are occurring, the motor control center could be installed in a separate air-conditioned room. Typically the MCC would be located on the factory floor near the machinery 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 may be unplugged from the cabinet to complete testing or maintenance, while really big controllers could be bolted in place. Every motor controller has a solid state motor controller or a contractor, overload relays to be able to protect the motor, circuit breaker or fuses to supply 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 power cables and field control.
Within a motor control center, each and every motor controller can be specified with numerous different alternatives. Some of the choices include: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and many types of bi-metal and solid-state overload protection relays. They also have different classes of types of power fuses and circuit breakers.
There are various choices concerning delivery of MCC's to the client. They could be delivered as an engineered assembly with interlocking wiring to a central control terminal panel board or programmable controller along with internal control. On the other hand, they could be provided prepared for the client to connect all field wiring.
Motor control centers usually sit on the floor and should have a fire-resistance rating. Fire stops can be necessary for cables that penetrate fire-rated walls and floors.
Click to Download the pdf