EcoDC MACS consists of a multitude of small, modular rectifier units each feeding only a few anode cells. This configuration, together with software especially developed for this application control, provides a system operation of unprecedented flexibility. Thus, e.g. different voltage or current curves are programmed for each type of vehicle body and run with it during the coating process. By dividing the process into small sections there is no production loss even in the event of a module malfunction. Expensive standby rectifiers are not required.