Safety circuit for an elevator installation

Details Safety circuit for an elevator installation Safety circuit for an elevator installation

B - Operations, Transporting

66

B

B66B 5/00 (2006.01) B66B 13/22 (2006.01)

Patent

CA 2322388

This safety circuit (1) consists of a series chain (2) of contacts (3), at least one safety relay (4), an electric power supply (5), and a monitoring device (6), the signal from the safety relay (4) being transmitted to an elevator control (7). The voltage across the safety relay (4) which is to be regulated is tapped at point (P1) and transmitted to a network (14) which is connected to the voltage converter (10). If all the contacts (3) of the series chain (2) are closed, the voltage across the safety relay (4) is held constant. Regulation of the voltage across the safety relay (4) makes the safety circuit (1), with respect to voltage drop, independent of the length of the cabling connecting the contacts (3).

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