Patent ID: 7921969

Claim:
Protection of an elevator, in which the elevator comprises a machinery brake, a safety brake of the elevator car, and an electrical drive, which electrical drive comprises an elevator motor and also a power supply appliance of the elevator motor, and which protection of an elevator comprises: determination of the limit value for the stator voltage and/or the stator current of the elevator motor restriction of the output of the electrical drive, in which the output of the electrical drive is restricted on the basis of the limit value for the stator voltage and/or the stator current determination of at least one limit value for permitted movement of the elevator car restriction of the movement of the elevator car, in which the movement of the elevator car is restricted on the basis of at least one determined limit value for permitted movement wherein at least one limit value for permitted movement of the elevator car is determined at least partly on the basis of the limit value for the stator voltage and/or stator current of the elevator motor, and in that the elevator car is fitted to move with a restricted movement during the aforementioned restriction of the movement of the elevator car.