Method for operating a motor-roller controller wherein a first value indicative of an amperage at an input power port of a first motor-roller controller is measured by a meter of the first motor-roller controller. The first value is sent to at least one second motor-roller controller via a signal bus port of the first motor-roller controller. At least one second value indicative of an amperage at an input power port of the at least one second motor-roller controller is received at the signal bus port. A nominal value for the amperage at the input power port of the first motor-roller controller is determined depending on the first value and the at least one second value, and the motor-roller control port of the first motor-roller controller is operated with an output current to the motor-roller such that the amperage at the input power port reaches the nominal value.