Safety circuit in an elevator system
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United States of America Patent
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Jun 23, 2015
Grant Date -
Jul 26, 2012
app pub date -
Oct 20, 2010
filing date -
Oct 26, 2009
priority date (Note) -
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Abstract
A safety circuit in an elevator system includes at least one series connection of safety-relevant contacts that are closed during trouble-free operation of the elevator system, wherein in the case of certain operating conditions in which at least one contact is opened, the at least one contact can be bridged by semiconductor switches, and wherein the semiconductor switches are controlled by at least one processor and monitored by at least one monitoring circuit for short circuits. At least one electromechanical relay circuit, having relay contacts connected in series with the contacts of the bridged series connection can be controlled by the at least one processor and the bridgable series connection can be interrupted by the relay contacts in the case of short-circuiting of the semiconductor switches.
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