Elevator testing system

Details Elevator testing system Elevator testing system

2007-04-13

2008-07-22

Salata, Jonathan (Department: 2837)

Elevator, industrial lift truck, or stationary lift for vehicle

With monitoring, signalling, and indicating means

C187S277000

Reexamination Certificate

active

07401685

ABSTRACT:
The invention concerns a method and a system for ensuring the operation of the safety circuit of an elevator or escalator, said safety circuit containing safety contacts (10, 12, 14) connected in series with a contactor (16). In the method, the largest bypass current coming to the contactor in a fault situation is defined, a testing device (202) is connected in series with the safety circuit, said testing device containing at least one resistor (26), which is used to produce a desired test current that is larger than the largest bypass current, and the neutral point (18) of the safety circuit is shifted if the contactor (16) remains energized by the aforesaid test current.

REFERENCES:
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patent: 5107964 (1992-04-01), Coste et al.
patent: 5392879 (1995-02-01), Boyce et al.
patent: 5487448 (1996-01-01), Schollkopf et al.
patent: 5549179 (1996-08-01), Herkel et al.
patent: 6056088 (2000-05-01), Gerstenkorn
patent: 6446760 (2002-09-01), Lisi et al.

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