• 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 5-42 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 Addi-
tional 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.
Additional NX Unit Power Supply Unit
DIN Track
Ground
Ground terminal
(Functional ground terminal)
Ground terminal
(Functional ground terminal)
End Cover
Shield Connection Unit
CPU Unit
Electrically connected to
the DIN Track through the
DIN Track contact plate.
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.
Grounding the CPU Rack with Peripheral Devices and in Control
Panels
Refer to 5-5-6 Grounding on page 5-64 for the grounding procedures for the CPU Rack with periph-
eral devices and in control panels.
Isolating the CPU Rack from the Control Panel
If the ground wire for a Unit with a ground terminal is shared with power equipment, noise will adverse-
ly affect the Units.
Y
ou can use OMRON NX-AUX01 DIN Track Insulation Spacers with PFP-50N or PFP-100N DIN
Tracks to isolate the CPU Rack from the control panel.
5 Installation and Wiring
5-40
NX-series NX502 CPU Unit Hardware User's Manual (W629)
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