Abstract: The invention relates to an energizing circuit of at least one magnetizing coil of an operational brake, the energizing circuit being configured for energizing the magnetizing coil, which energizing circuit comprises a rectifying bridge connected to the supply network, the output terminals of the rectifying bridge being connectable/connected to the input points of the magnetizing coil, characterized in that the energizing circuit comprises at least one reduced voltage circuit or external DC supply, whose outputs are connectable via to the to the input points of the magnetizing coil via a controllable operation switch of the energizing circuit. The patent application also comprises claims for a passenger conveyor and for a method.

Abstract: The invention relates to a safety arrangement of an elevator, which includes sensors configured to indicate functions that are critical to the safety of the elevator, and also a safety circuit, with which the data formed by the sensors indicating the safety of the elevator is read. The safety arrangement includes a drive device including a control circuit of a motor bridge, an input circuit for a safety signal that can be disconnected/connected from outside the drive device, and also drive prevention logic, to prevent the passage of control pulses to the control poles of high-side and/or low-side switches of the motor bridge when the safety signal is disconnected. The safety circuit brings the elevator into a state preventing a run by disconnecting the safety signal and removes the state preventing a run by connecting the safety signal.

Abstract: An adjustable brake controller of an elevator brake comprises a DC bus; first terminals for connecting the brake controller to a first magnetizing coil; second terminals for connecting the brake controller to a second magnetizing coil; a first controllable power switch coupled between the first terminals and the DC bus, the first controllable power switch being configured to supply electric power from the DC bus to the first magnetic coil responsive to a first control signal; a second controllable power switch coupled between the second terminals and the DC bus, the second controllable power switch being configured to supply electric power from the DC bus to the second magnetizing coil responsive to a second control signal; and a controller configured to generate the first and the second control signals for controlling the first and second power switches, respectively.

Abstract: The invention refers to an elevator rescue system (10) for moving an elevator car of an elevator in an emergency situation, which elevator includes an elevator motor acting on hoisting ropes by which the elevator car is suspended and/or moved, which elevator motor comprises at least one electro-mechanical brake (14a, 14b) and an encoder outputting a signal corresponding to its speed, which system comprises a back-up power source (36), a jerk monitoring circuit (22) connected to the encoder and comprising a memory (28) for at least one first upper threshold value for the car acceleration and/or its derivation, a brake feed circuit (16) which is controlled by the jerk monitoring circuit, at least one release switch (24) which is connected to the jerk monitoring circuit and/or to the brake feed circuit, in which system the operation of the release switch activates the brake feed circuit to release the brake, and initiates the jerk monitoring circuit to compare the car acceleration and/or its derivation as de

Abstract: A brake controller and an elevator system including the brake controller are disclosed. The brake controller includes a DC link for supplying power, the DC link including a positive DC link rail and a negative DC link rail; output terminals for connecting to a magnetizing coil of an electromagnetic brake; a current path established between the DC link and the output terminals for conducting DC link power to the magnetizing coil; and two solid-state switches fitted into the current path. Both solid-state switches are configured to adjust output terminal voltage by modulating the DC link voltage.

Abstract: A drive device of an elevator includes a DC bus, a motor bridge connected to the DC bus for the electricity supply of the elevator motor, which motor bridge includes high-side and low-side switches for supplying electric power from the DC bus to the elevator motor when driving with the elevator motor, and also from the elevator motor to the DC bus when braking with the elevator motor, a control circuit of the motor bridge, with which control circuit the operation of the motor bridge is controlled by producing control pulses in the control poles of the high-side and low-side switches of the motor bridge, a brake controller, which comprises a switch for supplying electric power to the control coil of an electromagnetic brake, a brake control circuit, with which the operation of the brake controller is controlled by producing control pulses in the control pole of the switch of the brake controller, an input circuit for the safety signal to be disconnected/connected from outside the drive device, drive prevention

Abstract: A safety arrangement of an elevator, which includes sensors configured to indicate functions that are critical from the viewpoint of the safety of the elevator, and also a safety circuit, with which the data formed by the sensors indicating the safety of the elevator is read. The safety arrangement includes a drive device for driving the hoisting machine of the elevator. The drive device includes a DC bus, and also a motor bridge connected to the DC bus for the electricity supply of the elevator motor. The motor bridge includes high-side and low-side switches for supplying electric power from the DC bus to the elevator motor when driving with the elevator motor, and also from the elevator motor to the DC bus when braking with the elevator motor.

Abstract: A brake controller, an elevator system and a method for performing an emergency stop are provided. The brake controller includes an input for connecting the brake controller to the DC intermediate circuit of the frequency converter driving the hoisting machine of the elevator, an output for connecting the brake controller to the electromagnet of the brake, a switch for supplying electric power from the DC intermediate circuit of the frequency converter driving the hoisting machine of the elevator via the output to the electromagnet of a brake, and also a processor with which the operation of the brake controller is controlled by producing control pulses in the control pole of the switch of the brake controller.