Elevator system

A method of checking a monitoring system in an elevator installation, the monitoring system including at least one support device having electrically conductive tensile carriers enclosed by an electrically insulating casing and a monitoring device for monitoring a state of the support device, method comprising at least one of the steps of:

• a) checking whether the tensile carriers are electrically connected with the monitoring device;
• b) checking whether the at least one support device is electrically connected with the monitoring device;
• c) checking whether an electrical resistance of one of the tensile carriers or a plurality of interconnected ones of the tensile carriers of the at least one support device lies within an electrical resistance range;
• d) checking whether a difference of an electrical resistance of one of the tensile carriers or a plurality of interconnected ones of the tensile carriers from an electrical resistance of another one of the tensile carriers or another plurality of interconnected ones of the tensile carriers of the at least one support device lies below a first threshold value;
• and
• e) checking whether a difference of an electrical resistance of one of the tensile carriers or a plurality of interconnected ones of the tensile carriers from an electrical resistance of another tensile carrier or another plurality of interconnected tensile carriers of a different support device lies below a second threshold value;
• wherein the method is performed before the elevator installation, after an installing action, is placed in an operation intended for the elevator installation and wherein the elevator installation is freed for the intended operation only if no deficiency has been established by the checking.