I have a variation of number of objects to be lifted - how can I make sure to not drop them or to use too much energy? How to optimize this type of system?

All suction cups not in contact with an object (open) will draw in a lot of air and demand a larger pump than actually necessary. By using different valves, such as piSAVE® sense, in the suction cups, the suction cups will be normally closed until they come in contact with the handled object. Only the cups needed in the specific lifting cycle will be open and flow air. Please see the video piSAVE® sense.