Siemens SIMATIC NET RUGGEDCOM RS900G Equipment Manual page 23

Installing the Device
2.6.2 Connecting Low DC Power
3.
4.
5.
6.
14
Braided Ground Cable
4
Figure 2.7 Terminal Block Wiring – Single DC Power Supply Inputs
Connect the negative wire from the power source to the negative terminal on
the terminal block.
Using a braided wire or other appropriate grounding wire, connect the surge
ground terminal to the chassis ground connection. The surge ground terminal
is used as the ground conductor for all surge and transient suppression circuitry
internal to the unit.
Connect the ground terminal on the power source to the chassis ground
terminal on the device.
If a redundant power source is required, repeat step 1 (Page 13) to step
5 (Page 14) using the second terminal.
RUGGEDCOM RS900G
Equipment Manual, 10/2023, C79000-G8976-1025-10