According to an aspect, there is provided a method for remote operation of a plurality of elevators in a centralized manner by a remote service system, the remote service system comprising a remote communication computer and wherein each of the plurality of elevators comprises an elevator controller associated with a communication computer. The method comprises receiving, by a remote service system from the communication computer associated with an elevator, a rescue request associated with the elevator; providing, by the remote service system, a verification to distinguish the elevator associated with the rescue request among the plurality of elevators; enabling, by the remote communication computer, a data connection with the communication computer associated with the elevator to control the verified elevator; and performing, by the remote service system, at least one remote operation associated with the verified elevator using the enabled data connection.

According to an aspect, there is provided a method for remote operation of a plurality of elevators, each of the plurality of elevators being coupled with a communication computer. The method comprises receiving, by a remote service system from the communication computer, a rescue request associated with an elevator; providing, by the remote service system, a verification to distinguish the elevator associated with the rescue request among the plurality of elevators; enabling, by the remote service system, a data connection with the communication computer to control the verified elevator; and performing, by the remote service system, a remote operation associated with the verified elevator via the enabled data connection.

Provided is an elevator monitoring system, including a gateway device, a load weighing device and an elevator controller; the elevator controller is configured to collect status information of an elevator car and fault information when an elevator fails; the gateway device is configured to obtain fault information and status information from the elevator controller; the load weighing device monitors current load value of the elevator car in real time and transmits the current load value to the gateway device; the gateway device calculates a minimum reference load value corresponding to each stopping floor level of the elevator car based on the current load value, updates and records the minimum reference load value in real time; based on the fault information and the status information, if the gateway device determines that the current load value is greater than the minimum reference load value, the gateway device will send a warning alarm.

An elevator safety system comprises: at least one position sensor, which is configured for determining a position value representing the position of the elevator car within the hoistway; at least one door sensor, which is configured for detecting whether the at least one door is closed; a limit setting unit, which is configured for determining an operation status of the elevator car and for setting at least one position limit according to the determined operation status; and a comparison unit, which is configured for comparing the determined position value with the set position limit and for determining an error condition, if the position value is not in compliance with the at least one position limit and the at least one door sensor indicates that at least one door is not closed.

A permanent magnet (PM) synchronous electric motor (34) includes a plurality of phases, and a plurality of motor drives (55,58) electrically connected to the PM synchronous electric motor. Each of the motor drives is operatively connected to a corresponding one of the plurality of phases. The plurality of motor drives is configured and disposed to deliver a torque current divided equally between each of the plurality of phases and independently deliver flux current to the corresponding one of the plurality of phases. A controller (44) is operatively connected to each of the plurality of motor drives to selectively control the PM synchronous electric motor, and a rescue module (120) operatively connected to the controller, the rescue module being configured and disposed to determine a failure of one of the plurality of motor drives and control the PM synchronous electric motor in a reduced operation profile employing remaining ones of the plurality of motor drives.

An elevator system, including at least one elevator cab, which can be moved at least in the vertical direction in an elevator shaft. A first drive device is provided for moving the at least one elevator cab. A platform device is provided, said platform device including a platform and a second drive device for moving the platform, wherein the platform is movable in the vertical direction and in at least one horizontal direction in the elevator shaft, wherein the second drive device is independent of the first drive device.

In a method for performing a manual drive in an elevator after mains power-off, the frequency converter of the motor is separated from mains, any safety blocking of the brake drive and/or motor drive is disabled, current is supplied from the battery to the brake drive to open the elevator brake and current is supplied from the battery to the drive control to allow regulation of the motor speed via the inverter bridge, the manual drive control observes the motor speed via the speed sensor and starts a speed feedback loop to regulate the motor speed to a manual drive reference value by feeding a three phase-AC current to the motor windings via the semiconductors of the inverter bridge, which manual drive speed reference is lower than the speed reference for normal elevator operation, when the car reaches a floor level the floor level indicator is activated, and the actuator is released whereafter the current supply from the battery to the elevator brake is interrupted and the previous disabled safety blocking of the brake drive and/or motor drive is enabled again.

The invention relates to a method for testing a capacity of a drive rescue battery for driving an electric motor of a transportation system in a rescue operation mode, wherein in normal operation mode AC means supply power over first, second and third phases via a low pass LCL-filter to a frequency converter for driving the electric motor, wherein the frequency converter comprises a rectifier circuit for providing a DC supply voltage. The method comprises the steps: disconnecting the LCL-filter from the AC mains; using inductors and capacitors of the LCL-filter, each of which being connected to the first or second phase, as a test load for testing the capacity of the drive rescue battery, wherein the inductor of the LCL-filter, which is connected to the first phase and downstream of the capacitor of the LCL-filter connected to the first phase, to the rectifier circuit, the capacitors of the LCL-filter connected to the first and second phases, and the inductor of the LCL-filter which is connected to the second phase and downstream of the capacitor of the LCL-filter connected to the second phase, to the rectifier circuit form a series connection as the test load; and determining at least one value of a voltage or a current of the drive rescue battery resulting from the test load.

Other aspects of the invention are a software program realizing the method and a testing arrangement for testing the capacity of the drive rescue battery.

The present disclosure relates to elevator technology. In particular, the present disclosure relates to an elevator system using a novel powering scheme. Further in particular, the present disclosure relates to an elevator system using a pressurised gas to power at least a part of the elevator system. Accordingly, there is provided an elevator system (200), comprising an elevator car (112) and an elevator drive (224) adapted to move the elevator car in an elevator shaft (302), wherein the elevator system further comprises a gas reservoir (204,a,b), wherein the gas reservoir is adapted for storing of a pressurized gas, wherein the gas reservoir is connected to an element of the elevator system for powering at least a part of the elevator system, and wherein the element is at least one element of a pneumatic elevator drive (224) and a generator (238). Further, there is provided a method of operating the elevator system and for modernizing an elevator system.

An elevator car with special measures for evacuation has several side walls, a floor and a ceiling, which together enclose an interior of the elevator car. The elevator car has a flap arranged on one of the side walls and a ladder for evacuating persons from the interior of the elevator car. The flap is movable between a closed state, in which the flap blocks access from the interior of the elevator car to an area behind the flap, and an open state, in which access is possible from the interior of the elevator car to the area behind the flap. The flap has a height less than the height of the side walls. In the closed state of the flap, the ladder is arranged in the area behind the flap. The ladder is removable from behind the flap and can be increased in length for the evacuation.