Method for preventive maintenance of elevator and elevator system

The invention relates to a method for preventive maintenance of an elevator speed sensor system comprising at least a first and a second sensor, which are independent of each other. The method comprises: determining a reference distance for an elevator car travel between a first door zone and a seco...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	AITAMURTO JUHA-MATTI, LEPPAKOSKI ARTTU, JUSSILA ARI, MUSTONEN MATTI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ELEVATORS ESCALATORS OR MOVING WALKWAYS HAULING HOISTING LIFTING PERFORMING OPERATIONS TRANSPORTING
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