Patent ID: 11866304
Assignee: LIEBHERR-WERK NENZING GMBH
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 20:
21. A method of controlling a crane slewing gear by means of an apparatus in accordance with claim 1, the method comprising the steps:
sensing an instantaneous load taken up by the crane;
sensing an instantaneous orientation of the crane and/or of a crane component;
determining a maximum permitted torque and/or a parameter derived therefrom for a current rotational movement of the slewing gear in dependence on at least the sensed load and the sensed orientation;
controlling or regulating the motor such that the angular acceleration and/or the angular speed of the slewing gear is/are limited to a value dependent on the maximum permitted torque; and
on a failure of the control unit or on the triggering of an emergency stop, automatically braking the slewing gear so that the maximum permitted angular acceleration and/or angular speed of the slewing gear/are not exceeded.