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5 Installation and Wiring
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
5-4 Wiring
5
5-4-5 Grounding
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.
• Using a dedicated ground wire, ground the ground terminals and DIN Track with a ground resistance
of 100 or less.
• The ground wire should not be more than 20 m long.
• Use a ground wire that is 2.0 mm
2
or larger. Refer to 5-4-8 Wiring to the CPU Unit Terminal Block on
page 5-45 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.
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
physical contact.
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.
Grounding the CPU Rack
Grounding the DIN Track
NX1P2
CPU Unit
DIN Track
Additional
NX Unit
Power
Supply Unit
Shield
Connec-
tion Unit
Functional ground
terminal
Ground
Electrically connected to the DIN Track
through the DIN Track contact plate.
Functional ground
terminal
Functional ground
terminal
End Cover
○○
○ ○
NX1P2
CPU Unit
DIN Track
Additional
NX Unit
Power
Supply Unit
Shield
Connec-
tion Unit
Functional ground
terminal
Ground
Electrically connected to the DIN Track
through the DIN Track contact plate.
Functional ground
terminal
Functional ground
terminal
End Cover
○○
○ ○
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