METHOD AND DETECTION SYSTEM FOR MONITORING THE SPEED OF A LIFT CAGE

摘要

In this method the speed of a lift cage is monitored. In the case of excess speed caused by brake failure of the motor brake or shaft fracture of the drive pulley shaft the safety circuit is opened and the detection system is transferred from the normal operationa l state (circle with a 1) to the retardation state (circle with a 2) in which it is monitore d whether the lift cage is retarded after defined speed presets. After a successful retardation the detection system is transferred to the state of standstill monitoring (circle with a 3 ) in which it is monitored whether the lift cage leaves its standstill position. If the prese ts of state 2 or state 3 are not fulfilled, the detection system is transferred to the brakin g state of the brake (circle with a 4) in which a brake which fixes the lift cage is activated.