Why are not all cars being used in a shuttle lift application?

Conventional Control, which is generally the best option for shuttle elevators, requires a special configuration when used in shuttle applications.

This is because, with only a single up or down button, the Group Collective or ETA algorithm sees just one hall call, even though all available elevators may need to be dispatched.

In many cases, the Group Collective Uppeak 1 or Uppeak 2 algorithm will work effectively. The home floor should be set to the floor with the peak arrival demand. This works because the elevators are returned to the home floor whether or not they are allocated to a call and, depending on the selected uppeak mode, the elevators will either queue and load one car at a time or have a door cycle initiated each time the car returns to the home floor.

In the highest-demand cases, with large shuttle lift groups and very heavy passenger volumes, it may be necessary to return all elevators and cycle every set of doors each time. This is an advanced option within the ETA algorithm. Please see the attached example.