Control system for hydraulic lift travelling speed - has contactless position sensor producing signals for flow restrictor valve

摘要

The control system is designed to regulate the travelling speed of hydraulically operated lifts. The system has servomotor driven flow restrictor valve. The restrictor valve adjusts any load and viscosity differences. The control system has contactless sensor for determining the lift cage position. This sensor produces an electrical signal for the regulator. This sensor is designed to generate cage position signals only for starting and end regions at the cage stop stations.