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Unformatted text preview: e protective device. • Sufficient protection against external influences such as vibration, dirt, stray fields, mains interference, short circuit, line break. • Self test, start-up test, self monitoring. Operative malfunctions in the protective device must be detected and signalled to the potentially dangerous equipment in the form of a cut-off command. • Inhibit re-start following the interruption of a hazardous movement. • Observation and identification of a specified safety distance between the protective area and the danger zone as well as identification of overtravel time. • Protection against encroachment of or reaching into the protective area from below or above as well as against remaining between the protective area and the danger zone. • Tests (prior to initial commissioning and additional regular routine testing also after retooling and repairs). 248 © Festo Didactic GmbH & Co. KG • FP 1110 15. Special designs and variants of proximity sensors Industrial designs of accident protection sensors for examp...
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.

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