| 摘要 |
<p>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. The drive device also includes 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, an input circuit for a safety signal, which safety signal can be disconnected/connected from outside the drive device, and also drive prevention logic, which is connected to the input circuit and is configured to prevent the passage of control pulses to the control poles of the high-side and/or low-side switches of the motor bridge when the safety signal is disconnected. The signal conductor of the safety signal is wired from the safety signal to the drive device, and the safety circuit comprises means for disconnecting/connecting the safety signal. The safety circuit is arranged to bring the elevator into a state preventing a run by disconnecting the safety signal, and the safety circuit is arranged to remove the state preventing a run by connecting the safety signal.</p> |
