Abstract: The invention relates to a method and a device for safely disconnecting electric drives, wherein disturbances of the electric drive which are independent from the driving and lifting speed are recognized in a delay-free manner by retaining the safety function and are used for disconnecting the electric drive. The signals of the sensors (7.1, 7.2, 8.1, 8.2) are detected in a redundant manner and are redundantly compared to preselected threshold values in evaluation devices (2.1, 2.2) such that the electric drive (12) is safely disconnected in a redundant manner without using mechanical position devices if the preselected threshold value of the electric drive (12) is exceeded.

Abstract: The invention relates to a method and a device for safely disconnecting electric drives, wherein disturbances of the electric drive which are independent from the driving and lifting speed are recognised in a delay-free manner by retaining the safety function and are used for disconnecting the electric drive. The signals of the sensors (7.1, 7.2, 8.1, 8.2) are detected in a redundant manner and are redundantly compared to preselected threshold values in evaluation devices (2.1, 2.2) such that the electric drive (12) is safely disconnected in a redundant manner without using mechanical position devices if the preselected threshold value of the electric drive (12) is exceeded.

Abstract: A method for pressure compensation in reversible motors used to drive hoisting cables and closing cables of a cable operated crane is provided. The method includes connecting a hydraulic motor to hoisting cables, connecting another hydraulic motor to closing cables, connecting the hydraulic motors to a common pressure medium source via delivery lines, performing a closing operation of a grab of the crane while simultaneously detecting working pressures in working circuits of the hydraulic motors, adjusting the working pressures during the closing operation using a control so that during the grab the working pressures are substantially equal to one another. The present invention also provides a device for pressure compensation in reversible motors for driving hoisting cables and closing cables of a cable operated crane.

Abstract: The invention relates to a monitoring and control system for mobile lifting and transport devices such as cranes, building machines, and transport vehicles, in which status data is obtained by monitoring selected device components and conveyed to at least one control console. Data and/or control commands are transmitted from the control console to the monitoring and control system. The system is operated with an open expandable architecture of exchangeable standard PC components and uses a real-time operating system for hard real-time computing and with a user program which conforms to IEC 1131-3.