Multiple lift control system - has lift cages making or breaking contacts in resistance circuit representing routes

摘要

The system ensures that only the nearest of the lift cages is called to serve a particular floor. As the cages travel they make or break an electrical contact in a resistance circuit representing in the control unit the routes taken by them. The contacts can not be on the sets of resistances representing the cages either travelling or stopped, without a programmed direction. The call circuits can be connected via contacts representing the call, using two sets of resistances connected to opposite sides of a third reference resistance in the main circuit, for stopped cages. For moving cages there is a resistance circuit per direction.