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Safety Requires Quality - in China, too!
On how to choose the correct brake
The global effects of competition in the elevator branch have repeatedly caused the price to play a major role, even for extremely safety-relevant components. The price/performance ratio for these products is very similar internationally. Therefore, performance and reliability are frequently economised on low-price products. Taking safety brakes as an example, this article shows you how a well-founded selection of reliable products can be made in spi te of the intense competitive market, and explains what to take into account in order to avoid unpleasant surprises. The suggestions and recommendations are of course also applicable for other safety-relevant components.
- Elevator drive from the Ningbo Shenling company, equipped with two safety brakes Type ROBA-diskstop from mayr power transmission (exhibit at the 2007 Interlift trade fair, Augsburg).
The globalization of the elevator drive market, the enormous competitive intensity, in particular in China as the main market for elevators, and the resulting problems of reproduction or production in countries with low production costs have caused an enormous amount of competitive pressure, even with safety-critical elements. Years ago, a clear commitment to reliability and the best quality could be observed. Nowadays, when talking to market participants, it becomes more and more obvious that the price has the top priority.
Normally, the leading global elevator manufacturers have the possibility to compile detailed requirement specifications based on very detailed product knowledge and intensive market experience. The required components, for example the safety brakes, can be adapted to the application very quickly and can be evaluated through tests. However, this is not applicable for the supplier industry in its entirety. For example, motor manufacturers who do not obtain the corresponding feedback via field data and who do not have the necessary resources to employ a big engineering team, normally work with simpler means to specify and to test a brake. The majority of elevator components are launched on the market by medium-sized companies with a lot of experience. The accident and malfunction statistics with regard to passenger lifts confirm that technically high quality products are used here which have been tested beforehand in an appropriate and reliable manner.
Passenger elevators are one of the safest means of transportation. Nevertheless, each accident and each breakdown should be considered an incentive for further improvement. Up to now, only a few experienced elevator brake manufacturers have been active on the market. Quality and reliability were guaranteed due to the respective competence. However, the rapid development, particularly on the Chinese market, harbours an enormous danger potential. The situation has changed fundamentally because of young market participants who do not have a lot of experience. Which criteria can a manufacturer of elevator motors - especially in the field of gearless technology - apply in order to choose a reliable brake?