Tuesday, July 26, 2016

A New SCHURTER Website

A website is something like a display window for a company. For this reason, the more than five-year old SCHURTER web presence was renewed and adjusted to current practices.

The SCHURTER website is valued by many customers, since it has all of the necessary information presented in a simple way. An adjustment was made particularly necessary through the new company organization, since the input systems sector not only continually becomes more important through higher revenues but also through the integration of Danielson. 

However, the product catalog only plays a minor role here, while competence in the area of technology applications is of greater importance and is presented correspondingly. Also, in the still young Solutions division it is just as important to show the different competencies in the product life cycle, which should increase the confidence for collaborating with SCHURTER as a service provider.

For the development of the new website, specific customer interviews were conducted, key usage numbers were collected for the current site, and usability concepts were gathered from the fashion industry. The world’s best Internet shops were also examined to prepare the new structure of the website. The design went through several steps and then was also verified by an independent consulting firm before the data maintenance could begin. The analyses showed very different user profiles, which all would like to be optimally served. For this purpose, corresponding role models and possible entry scenarios were developed and information paths were optimized specifically for a completion point.

The scope of the functions provided now presented serious problems for our new implementation partner during migration, since these functions often are only completely understood by specialists. This meant that the implemented solutions could not be enabled immediately but rather had to be adapted to customer requirements during complex test procedures. Because of this, it also was not possible to stick to the timetable.  

We are convinced that we can provide a fully developed website, which is modern, versatile, multilingual, quickly available and secure. Furthermore, it can also be easily adapted to local requirements. We hope that it will also fulfill the goals set in the coming years.

Visit our new website.

Monday, July 4, 2016

Leakage Currents in the Right Perspective

Electrical installations must have the property of functioning satisfactorily in their electro-magnetic environment (immunity) without affecting that environment (emission) in an intolerable manner. This is referred to as electromagnetic compatibility. 

We make a differentiation between radiated and conductive interferences. With conductive interference, there are symmetrical as well as asymmetrical interferences (also known as push-pull and push-push interference). Symmetrical interference flows between phase and neutral whereas asymmetrical interference flows between phase/ neutral and earth (ground). The causes of these kinds of interferences are network switches, frequency converters, processors, switching operations in electronic or electrical installations, motor controls, etc. Symmetrical interferences are attenuated with X-capacitors. 

For the attenuation of asymmetrical interferences, current compensated chokes are used for lower interference frequencies and Y-capacitors for the higher interference frequencies. These Y-capacitors are connected between phase/neutral and earth, and conduct the asymmetrical interferences rom phase/neutral to earth. Leakage currents ensue from this. The bigger the capacitors, the better the attenuation with correspondingly higher leakage currents.

Parasitic coupling capacities of an installation or equipment as well as long power lines also contribute to the leakage current of a filter. These lead to a summation of leakage currents that flow through the earth conductor that can give rise to a safety risk. Should a person touch an item of equipment having a defective (broken) earth conductor, the leakage current will flow through that person to earth. 

On the other hand, any residual current circuit breakers connected in a building network influence the reliable operation of equipment resulting from too high a leakage current. These residual current circuit breakers detect currents flowing in the earth conductor and disconnect the supply voltage should a certain threshold value be exceeded. For this reason, there are threshold values for leakage currents that permit reliable operation and ensure that even with defective earth connections, no person is injured.

Filter manufacturers specify leakage currents in their data sheets. The IEC filter standard does not define, however, how these specifications are to be carried out. This leads then to a situation where different manufacturers are not obliged to use the same methods to determine leakage currents. Consequently, the data given by various manufacturers is not directly comparable. Equipment standards on the other hand, e.g., IEC 60950 for office equipment, 60601- 1 for medical equipment or IEC 60335-1 for domestic equipment, specify in detail which threshold values are to be kept to and what method is to be employed in determining those values.

In order to take the various requirements regarding leakage current into account, manufacturers classify their products. With this, there are filters for standard applications, medical applications, industrial applications, etc. So as to maintain threshold values, only small, and in many cases no Y-capacitors are used. SCHURTER, for example, speaks of M5 filters having a maximum leakage current of 5μA (no Y-capacitors), or from M80 filters having a maximum leakage current of 80μA. There are no standards, however, that specify what classes there are, what these are called and what corresponding threshold values are to be applied. Nevertheless, this division helps the user to quickly find the appropriate product for his application.

For information check our website.
Download the whitepaper.