Drive Motor for Forklifts - Motor Control Centers or MCC's, are an assembly of one or more enclosed sections, which have a common power bus principally containing motor control units. They have been utilized ever since the 1950's by the auto trade, since they utilized a large number of electric motors. Today, they are utilized in other industrial and commercial applications.
Motor control centers are a modern practice in factory assembly for several motor starters. This particular machine could include metering, variable frequency drives and programmable controllers. The MCC's are normally found in the electrical service entrance for a building. Motor control centers often are utilized for low voltage, 3-phase alternating current motors that vary from 230 V to 600V. Medium voltage motor control centers are made for big motors which range from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments in order to accomplish power switching and control.
In areas where extremely corrosive or dusty methods are taking place, the motor control center can be installed in a separate air-conditioned room. Usually the MCC will be located on the factory floor adjacent to the equipment 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. In order to complete testing or maintenance, extremely big controllers could be bolted into place, while smaller controllers could be unplugged from the cabinet. Each motor controller consists of a contractor or a solid state motor controller, overload relays to protect the motor, circuit breaker or fuses to provide short-circuit protection and a disconnecting switch in order to isolate the motor circuit. Separate connectors allow 3-phase power to be able to enter the controller. The motor is wired to terminals located in the controller. Motor control centers offer wire ways for field control and power cables.
Each and every motor controller in a motor control center could be specified with different alternatives. These choices comprise: control switches, pilot lamps, separate control transformers, extra control terminal blocks, as well as various types of bi-metal and solid-state overload protection relays. They also comprise various classes of types of circuit breakers and power fuses.
There are several alternatives regarding delivery of MCC's to the client. They can 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 ready 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 needed for cables that go through fire-rated floors and walls.
Click to Download the pdf