Omron NX701-1700 User Manual page 122

4 Installation and Wiring
DIN Track Contact Plates
A Unit that has a ground terminal also has a DIN Track contact plate on the back of the Unit.
The DIN Track contact plate is connected internally to the ground terminal on the Unit.
This means that the ground terminal will be electrically connected to the DIN Track.
Unit side
Protective ground
terminal
Additional Information
The CPU Unit has no ground terminals, thus no DIN Track Contact Plates.
Therefore, the grounding part of the CPU Unit will be grounded through the Power Supply Unit.
Grounding the CPU Rack
This section describes how to ground the ground terminals on the CPU Rack.
The protective ground terminals on the Power Supply Units, the functional ground terminals that are
provided on some Units, and the DIN Track are grounded.
Power Supply Unit
DIN Track
• To help prevent electrical shock, ground the ground terminal (GR:
ground resistance of less than 100 Ω using a 14-gauge wire (minimum cross-sectional area of 2 mm
• The line ground terminal (LG:
a significant source of errors or electrical shocks are a problem, connect the line ground terminal to
the ground terminal and ground both with a ground resistance of less than 100 Ω.
• If the LG and GR terminals of the Power Supply Unit are connected, ground to a resistance of 100 Ω
or less to prevent electric shock.
• The ground wire should not be more than 20 m long.
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DIN Track
contact plate
Connected inside the Unit.
Electrically connected to the DIN Track
through the DIN Track contact plate.
Ground terminal
Ground
) of the Power Supply Unit is a noise filter neutral terminal. If noise is
) of the Power Supply Unit with a
NX-series CPU Unit Hardware User's Manual (W535)
2
).