Multicar elevator system

A method for performing a maintenance of a multicar elevator system, the multicar elevator system comprising:

• a plurality of individually controllable elevator cars;
• an elevator shaft system having at least two vertical shafts and at least two transfer stations forming a common circular path for the plurality of elevator cars;
• the plurality of the elevator cars and the elevator shaft system comprising a plurality of elevator components, at least some of the plurality of the elevator components are equipped at least one sensor adapted to generate measurement data representing an operational condition of a respective elevator component;
• a controller communicatively connected at least to the elevator components equipped with the sensor for receiving the measurement data;
• the method, performed by an elevator maintenance system, comprising:
• receiving the measurement data;
• determining the operational condition of the respective elevator component on a basis of the received measurement data;
• and
• generating a maintenance signal carrying maintenance data comprising data defining an instant of time of a maintenance for performing the maintenance of at least one elevator component among the plurality of elevator components, the maintenance is scheduled in accordance with the operational condition of the respective at least one elevator component before a failure of the at least one elevator component, the maintenance signal including a maintenance order defining information for a maintenance operation including time of the maintenance operation and elevator component, wherein
• the controller of the multicar elevator system is configured to run the multicar elevator system in one of the following operational modes:
• a first operational mode in which the individually controllable elevator cars are arranged to move in the circular path consecutive to each other;
• a second operational mode in which a motion of at least one of the individually controllable elevator cars deviates from a circular motion along the circular path;
• and wherein the elevator maintenance system is configured to schedule at least one maintenance work indicated in the maintenance signal to the second operational mode.