Omron NX701-1620, User Manual

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4 Installation and Wiring
4 - 36 NX-series CPU Unit Hardware User’s Manual (W535)
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.
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.
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.
• GR terminal is a ground terminal to prevent electrical shock. Always ground the terminal.
• LG terminal is a noise-filtered neutral terminal to increase noise resistance, and it is effective in sup-
pressing power supply common noise. The internal circuit is shown in the following figure. Ground
the LG terminal alone or connect the LG terminal with the GR terminal.
DIN Track Contact Plates
Grounding the CPU Rack
DIN Track
contact plate
Protective ground
terminal
Unit side
Connected inside the Unit.
Power Supply Unit
Ground terminal
Ground
DIN Track
Electrically connected to the DIN Track
through the DIN Track contact plate.