| 摘要 |
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.
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