Methods and systems for monitoring an elevator communication module fault, and elevator systems. The method for monitoring an elevator communication module fault includes acquiring a feedback result in response to sending requests from one or more client ends to the elevator communication module, the elevator communication module being provided for having near-field wireless communication with a client end; counting the number of request failures in the feedback result within a pre-set duration; judging whether the countered number of request failures is not less than a pre-set threshold, and if yes, determining that the elevator communication module has a fault. The invention can quickly and efficiently detect the elevator communication module that has failed, improve elevator passengers' experience, and ensure that the elevator is in excellent operation condition and has a reliable safety performance.

An illustrative example elevator system includes an elevator car and a valve assembly that selectively directs fluid flow to control movement of the elevator car. At least one sensor provides an indication of a current status of the elevator car, which includes at least a position of the elevator car or a speed of the elevator car. A processor receives the indication from the at least one sensor and adjusts operation of the valve assembly when the current status of the elevator car is different than a predetermined desired status.

A safety electronic switch, having a first terminal, a second terminal, a third terminal, a surge voltage suppression unit, a comparator, and a relay. The surge voltage suppression unit is connected to a safety circuit through the first terminal. The first terminal is provided with a live wire end and a neutral wire end. The surge voltage suppression unit is connected to the comparator. The comparator is connected to the relay. The relay is connected to the second terminal and the third terminal. The third terminal is connected to a low-voltage power supply. The third terminal is provided with a positive electrode and a negative electrode that are connected to the low-voltage power supply.

A speed governor assembly and an elevator system. The speed governor assembly includes: a sheave; a centrifugal mechanism mounted on the sheave and rotating together with the sheave; an overspeed protection switch at a first distance from a radial outer side of the centrifugal mechanism; a core ring disposed coaxially with the sheave; and a triggering arm rotating together with the core ring; wherein the centrifugal mechanism engages with the core ring and drives the core ring and the triggering arm to rotate when the sheave reaches a second speed, and the rotation of the triggering arm can contact and trigger the overspeed protection switch.

Distributed drive systems with synchronized motors in accordance with embodiments of the invention are disclosed. In one embodiment, a distributed drive system for a lift is provided, the distributed drive system comprising: a first drive unit comprising: a first drive unit screw, a first motor unit concentric to the first drive unit screw, and a first drive unit nut in contact with the first drive unit screw and a carrying platform of the lift; a second drive unit comprising: a second drive unit screw, a second motor unit concentric to the second drive unit screw, and a second drive unit nut in contact with the second drive unit screw and the carrying platform of the lift; and a control feedback module operatively connected to the first and second drive units, wherein the control feedback module is configured to synchronize the first motor unit and the second motor unit.

A method for maintenance of an elevator in Shabbat mode, the method including providing a Shabbat elevator maintenance system, where the system is in communication with the elevator, detecting a malfunction in the elevator by the maintenance system, notifying a technician about the malfunction by the maintenance system, following repair of the elevator by a repairing technician, verifying by the maintenance system that the elevator has been repaired and that Shabbat mode has been reactivated, and activating remuneration for the repairing technician by the maintenance system.

The invention relates to a method and to an apparatus for performing a rescue run with an elevator. In the method information is received from the sensors measuring the operation of the elevator about the points being measured with the sensors in question, one or more rescue run functions are selected on the basis of information received from the sensors, and also a rescue run, including the selected one or more rescue run functions, is performed.

An illustrative example elevator system includes an elevator car and a valve assembly that selectively directs fluid flow to control movement of the elevator car. At least one sensor provides an indication of a current status of the elevator car, which includes at least a position of the elevator car or a speed of the elevator car. A processor receives the indication from the at least one sensor and adjusts operation of the valve assembly when the current status of the elevator car is different than a predetermined desired status.

A passenger transport installation, e.g. an elevator or stairway, includes at least one drive motor, a conveying device, sensors and an installation controller. The installation controller is connected to at least one local bus node via a status bus, which bus node can receive status signals from an assigned sensor and transmit the same to the installation controller via the status bus to control the passenger transport installation depending on the status signals received. A servicing controller, as a replacement for at least one of the sensors, is connected to the local bus node that is assigned to the replaced sensor or to a centralized bus node for delivering simulated status signals that correspond to the status signals of the replaced sensor in a state that is selectable by the servicing controller.

An elevator safety system includes: an electronic safety controller; at least one safety sensor providing safety-related information; at least one dual-channel safety node communicatively connected to the safety controller and configured to obtain safety-related information from the at least one safety sensor; and a safety diagnostics configured to: detect a single-channel failure of the at least one dual-channel safety node, and in response to detecting a single-channel failure, determine integrity of the obtained safety-related information. In case the safety-related information was determined intact, the safety controller is configured to generate a command allowing a rescue run of an elevator car to a rescue floor using said safety-related information. An elevator system and an elevator car rescue run method are also disclosed.