Sparks Electrical News April 2021

MCCS AND MOTOR PROTECTION

11

WEG takes soft-starters to next level with SSW900 range T he new WEG SSW900 soft-starters are the ideal choice for complete motor control and protec- tion. These units allow quick and simple access

to application information and configuration settings in any installation throughout a wide range of industrial segments where a three-phase induction motor needs to be controlled. With its well-structured menu interface, the WEG SSW900 line gives users a new level of interactivity, including Bluetooth connectivity. These soft-starters provide event logs with dates and times, as well as a setup and programming assistance. The built-in bypass extends the lifespan of the units, optimising space and reducing heat dissipation inside electric panels. This built-in bypass functionality also extends throughout the WEG soft starter product range, up to 1400 Amps. By allowing the smooth acceleration and deceleration of motors by controlling the voltage, soft-starters greatly reduce mechanical stresses on couplings and transmission devices during the start-up of a motor. In pumping applications, the smart control prevents water hammer and pressure overshoots in hydraulic piping. Available from Zest WEG and its network of branches and value-added resellers in current ranges from 10 A to 1,400 A – and for supply voltages from 220 V to 575 V AC – the WEG SSW900 soft-starters can operate at ambient temperatures of up to 55°C without current derating. They can substitute direct online starters or star-delta starters, bringing a range of benefits to the user’s application. These include savings in electricity, as well as greater protection and increased durability of the electric motor. Users also have access to diagnosis and fault history, and experience greater flexibility as the WEG SSW900 allows the installation of accessories in the application. Graphic monitoring and customisable main screens provide further convenience. The monitoring functionality is also extended by a USB connector available on all standard products. This provides access free of charge to product software available on www.weg.net.

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F rom the time of the ori ins of humans when hunter- atherers ran across the open Savannah chasin a buck for dinner, all people have been constantly immersed in radio waves. Way back then it was radio waves from deep space, but then shortly before the Boer War, Heinrich Hertz showed that mathematical predictions of the nature of electroma netism were correct and that radio waves could be intentionally transmitted from one antenna to another. So today your hi-fi and electrical wall plu show frequency in Hertz (Hz). We lau h when we hear that a news reporter asked Hertz what the practical applications of his work were and he re- plied; “None, I just wanted to show that the mathematical predic- tions of electroma netism were correct.” The maths also showed that radio waves and li ht were the same thin , it was only the frequency which was di…erent. As the 20th Century pro ressed, the whole electroma netic spectrum was investi ated in extensive depth, from the lowest frequencies to the hi hest. For day-to-day practicality we name portions of this continu- ous spectrum with various commercial names, such as radio, FM radio, li ht, X-rays, microwaves, ultraviolet, infrared, VHF, UHF, and more. They are all the same thin , but with di…erent frequencies. The di…erent frequencies result in di…erent properties. For exam- ple, the human eye has evolved to see that part which we call li ht. Researchers say that some insects appear to be able to see some Ultraviolet (UV), but people can’t. All types of radio-wave devices exploded onto the world sta e, particularly over the last half-century, and radio-wave tra”c of all sorts increased dramatically. People are now daily exposed to FM radio, TV broadcast, police radio, aircraft positionin beacons, and at times other types, such as X-rays or other medical scanners. Because of all the commercial and military applications, scien- tists have investi ated everythin that can be thou ht of concern-

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SPARKS ELECTRICAL NEWS

APRIL 2021