Method and device for safely disconnecting electric drives

摘要

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.