Omron NX1P2 Series Hardware User Manual page 192

5 Installation and Wiring
Grounding the CPU Rack
This section describes how to ground the ground terminals on the CPU Rack.
The functional ground terminals that are provided on some Units and the DIN Track are grounded.
○
DIN Track
Ground
• Using a dedicated ground wire, ground the ground terminals and DIN Track with a ground resist-
ance of 100 Ω or less.
• The ground wire should not be more than 20 m long.
• Use a ground wire that is 2.0 mm
page 5-51 for information on ground wires that are applicable to the functional ground terminal on
the CPU Unit. For information on ground wires that are applicable to the functional ground terminals
on the Additional NX Unit Power Supply Unit or Shield Connection Unit, refer to the NX-series
System Units User's Manual (Cat. No. W523).
If the DIN Track is made of steel and the surface is not treated to produce an insulating material, you
can omit grounding the functional ground terminal on any Unit that has one, as shown in the following
figures.
○
DIN Track
Ground
If the surface of the DIN Track is treated to produce an insulating material (e.g., anodized aluminum),
the DIN Track contact plate will not be electrically connected to the DIN Track even if they are in physi-
cal contact.
Grounding the DIN Track
Attach a crimped terminal to the ground wire and then connect it to mounting hole on the DIN Track
with a screw to ground the DIN Track.
5-48
Functional ground
Electrically connected to the DIN Track
terminal through the DIN Track contact plate.
NX1P2
CPU Unit
2
or larger. Refer to 5-4-8 Wiring to the CPU Unit Terminal Block on
Functional ground Electrically connected to the DIN Track
terminal through the DIN Track contact plate.
NX1P2
CPU Unit
Additional
NX Unit
Power
Supply Unit
○
Functional ground
terminal
Additional
NX Unit
Power
Supply Unit
○
Functional ground
terminal
NX-series NX1P2 CPU Unit Hardware User's Manual (W578)
End Cover
Shield
Connec-
tion Unit
○
Functional ground
terminal
End Cover
Shield
Connec-
tion Unit
○
Functional ground
terminal