Each time the supply voltage is switched on, a 30-minute commissioning mode is carried out. During this time, the controller signals are switched through 1:1 to the outputs. The pump contact works with the 2-minute switch-on delay and run-on time. During these 30 minutes, the input signals are analyzed and used to calculate the balancing which starts after the commissioning mode. The controller signals are also continuously analyzed during operation; changes are implemented in the control behavior.