Power supply through trailing cable - SmartRelay 3 system
If the cab does not have its own power supply (voltage too high or insufficient power reserves) or is not suitable to supply power to the SREL3 ADV system for other reasons, the power supply must be provided via the trailing cable.
Option 1: Tapping the power supply for the controller
This configuration dispenses with the need for a separate power supply unit for the reader and SmartOutput modules. The data lines are connected as described in the sections on the reader (see Connecting one or more readers) and SmartOutput module (see Connecting one or more SmartOutput modules).
WARNING
Overload in the power supply unit
The SmartOutput module and reader are additional power consumers. They may overload the controller's power supply unit and cause a fire.
- Use a power supply unit which is designated for the total continuous currents for all connected components.
IMPORTANT
Overvoltage on the SmartOutput module
The permitted supply voltage for the SmartOutput module differs from the permitted supply voltage for the reader or controller (see Properties).
- Use Option 2 if the controller's supply voltage is outside the range in the SmartOutput module's specifications.
Option 2: Own power supply unit for reader and SmartOutput module
This configuration requires a separate power supply unit for the reader and SmartOutput modules. The earth systems in the controller, power supply unit and reader/SmartOutput modules must be interconnected to establish a common reference potential for data transmission.