Abstract: The invention relates to a method for active dynamic braking of an elevator system. The method comprising: detecting a dynamic braking situation, obtaining speed data representing a speed of an elevator car, and activating an active dynamic braking operation for dynamically braking the movement of the elevator car, if the obtained speed data indicates that the speed of the elevator car reaches a predetermined monitoring speed level. The active dynamic braking operation comprises operating a motor inverter of an elevator drive unit of the elevator system by switching high-side switches and low-side switches of the motor inverter in a controlled manner so that a rotating field is generated in stator windings of a hoisting motor for dynamically braking the rotation of the hoisting motor and thus the movement of the elevator car. The invention relates also to an elevator drive unit, an elevator system, a computer program, and a computer-readable storage medium.

Abstract: A battery system for supplying electrical energy to an elevator system is provided, the battery system including: a battery module having a number of battery cells, a battery management unit configured to obtain measurement data from at least one sensor associated to the battery system, a communication interface for communicatively connecting the battery system to the elevator system, and a power supply interface for transferring the electrical energy between the elevator system and the battery system. Also an elevator drive system, an elevator system, a computer implemented method and a computer program are provided.

Abstract: A method includes monitoring position and/or movement of an elevator car in a standby mode of a braking arrangement, and activating the braking arrangement from the standby mode in response to a detection of a change in the position or of the movement. An elevator and an electric power converter are also disclosed.

Abstract: A method for detecting a loss or an undervoltage condition of phase of an electric converter unit, wherein the method comprises: determining an extremum value, such as a maximum and/or a minimum value, of a phase voltage of the electric converter unit for at least one fundamental period of the phase voltage, and comparing the extremum value to a first threshold value, and if, based on the comparison, a first threshold criterion related to the first threshold value is satisfied, then determining the loss or the undervoltage condition of phase.

Abstract: A method for testing a capacity of a drive rescue battery includes opening a first switching device and second switching device to disconnect a LCL filter from AC mains and form a test load for testing the capacity of the drive rescue battery while disconnecting one of the LCL filter capacitors associated with a third phase from the test load, the test load including a series connection from one of the downstream LCL filter inductors and the LCL filter capacitors associated with the first phase to one of the LCL filter capacitors and the downstream LCL filter inductors associated with the second phase; and determining at least one of a voltage or a current of the drive rescue battery resulting from the test load.

Abstract: A method for detecting a loss or an undervoltage condition of phase of an electric converter unit, wherein the method comprises: determining an extremum value, such as a maximum and/or a minimum value, of a phase voltage of the electric converter unit for at least one fundamental period of the phase voltage, and comparing the extremum value to a first threshold value, and if, based on the comparison, a first threshold criterion related to the first threshold value is satisfied, then determining the loss or the undervoltage condition of phase.

Abstract: 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.

Abstract: The invention relates to an arrangement for releasing the operating brake of an elevator in an emergency situation and for driving an elevator car of the elevator to a floor level, comprising at least one electric operating brake of the elevator as well as a brake release lever, which brake release lever is connected with the brake via a mechanical transmission means, which arrangement further comprises an overspeed governor connected with a gripping device of the elevator car. According to the invention in between the brake release lever and the brake a coupling device is arranged, which coupling device is controlled by the overspeed governor. Via this means the car velocity is controlled also during release of trapped passengers.

Abstract: The invention relates to an arrangement for releasing the operating brake of an elevator in an emergency situation and for driving an elevator car of the elevator to a floor level, comprising at least one electric operating brake of the elevator as well as a brake release lever, which brake release lever is connected with the brake via a mechanical transmission means, which arrangement further comprises an overspeed governor connected with a gripping device of the elevator car. According to the invention in between the brake release lever and the brake a coupling device is arranged, which coupling device is controlled by the overspeed governor. Via this means the car velocity is controlled also during release of trapped passengers.