Abstract: A disclosed method for operating a treatment system and to a treatment system for electrophoretic dip coating, more particularly dip painting of a metal workpiece, more particularly of a vehicle body, in a dipping tank filled with a paint, wherein: a relative movement between the workpiece and a bus bar is carried out in the dipping tank; a voltage is applied to the workpiece; and, while the workpiece is in the effective range of at least one bus bar portion of the bus bar, electric current is fed to the workpiece from the at least one bus bar portion at least some of the time. Examples disclosed herein also relate to a treatment system and to a computer program product.