Advantech RS-485 user manual Figure E-5 Grounding Reference

Appendix E

E.5 Grounding reference (Ground bar for the factory environment should have a standard resistance below

5Ω)

Since ADAM-4000 / 5000 system comes with a plastic outer case with DC power supply, its grounding procedure should be done according to the following points:

ØPower supply : The E terminal of the external power supply should be connected with the panel.

ØThe outer case of panel should be fixed with two grounding bus. Connect the ground of power (E-terminal) to the grounding bus with shortest path. Use single contact for connection.

ØAnother grounding bus is for connection with AI and AO shielded signal wires. While AI and AO signal wires enter inside the panel, the shielding materials is stripped off and its copper mesh should be entangled together (There is no effect leaving alone any single wire strand). Connect to grounding bus in the shortest path, and then connect the two grounding buses in a way such as the following illustration: (Please note that wire length should not be too long, otherwise it will compromise the quality of the twisted- pair wires)

T/B	AI
ADAM 5000/485
	AO
DC
P/S	Copper mesh for Shielding
E Grounding Bus
Tr	(should be grounded only on one end)
Grounding Bus

Connect to ground bar on the factory.

The ground bar should have a resistance below 5 ohm.

E

Figure E-5 : Grounding Reference

ADAM-5000 E-5