ELEVATOR SYSTEM
A lift system having an overspeed monitoring function for monitoring terminal stops includes an electromechanical transducer (52) arranged to provide a first signal (ECI) related to desired or nominal speed as a function of the distance of the car from the terminal floor. The first signal is process...
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Zusammenfassung: | A lift system having an overspeed monitoring function for monitoring terminal stops includes an electromechanical transducer (52) arranged to provide a first signal (ECI) related to desired or nominal speed as a function of the distance of the car from the terminal floor. The first signal is processed (86) to have substantially the same magnitude and slope as a second signal (TACI) produced by a tachometer (70) during a normal terminal slowdown. The first and second signals are compared (82) to provide a deviation or error signal which in turn is compared with a reference (92) selected according to the maximum allowable speed error. Should this maximum allowable speed error be reached, the overspeed function provides a signal which may be used to initiate an emergency terminal stop. |
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