Each of the sliders controls one of the three services of the crane (Turn on / Turn of electromagnet, move crane 180 degrees, move hook up and down).
Move the crane to one of the defined positions and pick up a small ball from the bowl. Then you have to deduce the weight of the small ball reducing the voltage and observing the relation voltage/weight on dinamic chart. You can pick up several balls at same time and you can see how they are going to fall when you reduce the voltage. Every ball has a different weight. Try it and enjoy!
You are controlling remotely three services.
You can help yourself with the ILS created for this lab: http://www.golabz.eu/spaces/power-electromagnetism