Common earth with SREL3 components - SmartRelay 3 system

This wiring layout presupposes that the cab already has a power supply line connected to the outside world. In the cab, a voltage converter transforms the voltage and provides the power to the reader and SmartOutput modules. Unlike variants with a common earth line (see Common earth with power supply), the power supply's earth line is not used in this case; a separate line is used as a common reference potential between, the controller, reader and SmartOutput modules instead. Depending on the voltage converter design, the SREL3 ADV system can thus be disconnected from the lift electronics.