An elevator includes an elevator motor, a motor drive for the elevator motor having a frequency converter including a rectifier bridge, an inverter bridge and a DC link in between, which frequency converter is controlled via a controller, the rectifier bridge being connected to AC mains via three feed lines including chokes, and the rectifier bridge being realised via controllable semiconductor switches, an isolation relay being located between the feed lines and AC mains, a backup power supply at least for emergency drive operation, an emergency control for performing an automatic emergency drive, the backup power supply is via a first switch connectable with only a first of the feed lines. A second and/or third of the feed lines is via a second switch connectable as power supply to a car door arrangement, the first switch as well as the second switch are controlled by the emergency control, and the emergency control is connected to a manual drive circuit having a manual drive switch for a manual rescue drive. The elevator includes a first feedback circuit configured to provide to the emergency control first information indicating the switching state of the isolation relay, a second feedback circuit which is configured to provide to the emergency control second information indicating switching state of the first switch. The emergency control is configured to selectively allow or prevent the emergency drive operation on the basis of the first information and the second information.

An elevator drive apparatus is described which includes a drive unit for driving an elevator car, a brake device for braking a motion of the elevator car, a detector for detecting an electrical operation amount of the drive unit, and a controller. The controller is configured to release the brake device, to compare the detected electrical operation amount with a threshold, and to apply the brake device when the detected electrical operation amount exceeds the threshold. In this way, it is ensured that a speed of the elevator car in case of a rescue situation is within a safety limit.

An elevator includes an elevator motor; a motor drive for the elevator motor having a frequency converter comprising a rectifier bridge, an inverter bridge and a DC link in between, which frequency converter is controlled via a controller, the rectifier bridge being connected to AC mains via three feed lines comprising chokes, and the rectifier bridge being realised via controllable semiconductor switches; a contactor being located between the feed lines and AC mains; a backup power supply at least for emergency drive operation; and an emergency control for performing an automatic emergency drive. The backup power supply is via a first switch connectable with only a first of said feed lines. A second and/or third of the feed lines is, via a second switch, connectable as power supply to a car door arrangement, the first switch, as well as the second switch, are controlled by the emergency control, and the emergency control is connected to a manual drive circuit having a manual drive switch for a manual rescue drive.

An elevator balanced-load rescue device, an elevator, and an elevator balanced-load rescue method are provided by the present disclosure. The elevator balanced-load rescue device includes: a clamping wheel set including a driving wheel and a driven wheel that cooperate with each other; wherein the clamping wheel set has a clamping position and a releasing position; in the clamping position, the driving wheel and the driven wheel move toward each other to clamp a traction belt connected between an elevator car and an elevator counterweight; and in the releasing position, the driving wheel and the driven wheel move opposite to each other to release the traction belt; a transmission shaft which has a first end connected to the driving wheel of the clamping wheel set, and which transmits a torque to the driving wheel; and an energy storage device associated with the transmission shaft.

A system and method for detection of a malfunction in an elevator. The system includes an elevator cab, a server, at least one sensor, and a controller. The controller receives a signal captured by the at least sensor and transmit to the server. The server processes the transmitted signal and prognostically detects the malfunction in the elevator cab.

A safety control device (1) for a people conveyor (101). The safety control device (1) includes a first safety control channel (2) configured to output a first safety control signal in response to one or more input signals (10, 12, 14), a second safety control channel (4) configured to output a second safety control signal in response to one or more input signals (10, 12, 14), and an override control channel (6) configured to: monitor the health of the first and second safety control channels (2, 4), determine whether a fault has occurred in either of the first or second safety control channels (2, 4), and override the first or second safety control signal in response to a determination that a fault has occurred in the corresponding safety control channel (2, 4).

A device for controlling an elevator system, the elevator system having an elevator shaft delimited by a shaft wall including a wall opening connecting an inner face of the shaft wall to an outer face of the shaft wall, is positioned in the wall opening. The device has a housing receiving a controller for controlling the elevator system, wherein the housing includes a housing opening allowing access to the controller and the housing is rotatably mounted in the wall opening for rotation between a first position and a second position in an operational state of the device. The housing opening is accessible from the outer face of the shaft wall in the first position and from the inner face of the shaft wall in the second position.

An elevator system includes an elevator car, an elevator controller, and a safety controller, connected to a plurality of safety devices arranged to monitor the elevator system. The safety controller is configured to receive a signal in response to a change of state of any of the safety devices, and to determine a condition of the elevator system in response to the change of state of one or more of the safety devices. If the safety controller renders a determination that the elevator system is in a first condition, the safety controller causes an elevator brake to be deployed, preventing movement of the elevator car. If the safety controller renders a determination that the elevator system is in a second condition, the safety controller allows movement of the elevator car for a predetermined duration or until the elevator car has travelled a predetermined distance.

An access door assembly for an elevator car, the access door assembly including: an elevator car panel including an access hatch; an access door panel arranged to close the access hatch; and a hinge mechanism connecting the access door panel to the elevator car panel; the hinge mechanism allows the access door panel to move from an initial closed position in an initial plane to a final open position in a final plane substantially parallel to the initial plane; wherein the initial plane is the plane of the elevator car panel; and the hinge mechanism constrains the access door panel when opening to move perpendicular to the initial plane of the elevator car panel and to rotate around an axis perpendicular to the initial plane of the elevator car panel, to enable the access door panel to reach a final open position.

The present invention provides a maintenance safety apparatus for an elevator system and a method for operating the same, and belongs to the technical field of elevators. The maintenance safety apparatus of the present invention comprises a safety switch, a door lock device, a linkage control assembly and a linkage locking assembly. The maintenance safety apparatus of the present invention is very simple to operate and is capable of ensuring the safety of the staff entering a hoistway for performing maintenance operations.