PSU02 is used to convert alternating current values 0-5A, 0-120V into a direct current loop of 4-20mA, which is then fed to the input of the measuring modules of the CDS1 system. The cabinet contains 6 Rawett type converters, used for current conversion and 1 converter for measuring the voltage part of the car. The power supply for the converters itself is part of the cabinet. The power supply of the entire system is signaled by a pair of lights on the cabinet door.