Omron SYSMAC CS Series Operation Manual page 355

Wiring
Grounding
Note 1. Use crimp terminals for wiring.
2. Do not connect bare stranded wires directly to the terminals.
3. Wire the power supply with the correct polarity. Supply power to all of the
Power Supply Units from the same source.
4. Remove the label after the completion of wiring to ensure proper heat dis-
sipation. Leaving the label attached may result in malfunction.
The diagram below shows the location of the ground and line ground termi-
nals.
• To help prevent electrical shock, ground the ground terminal (GR:
a ground resistance of less than 100 Ω using a 14-gauge wire (minimum
cross-sectional area of 2 mm
• The line ground terminal (LG:
noise is 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.
• The ground wire should not be more than 20 m long.
• The following grounding configurations are acceptable.
• The CS-series Backplanes are designed to be mounted so that they are
isolated (separated) from the mounting surface to protect them from the
effects of noise in the installation environment (e.g., the control panel).
(C200HX/HG/HE and C200H Backplanes are mounted directly to the
mounting surface. If Expansion I/O is being affected by control panel or
other environmental noise, use the C200HW-ATT@@ or C200H-ATT@@
Backplane Insulation Plates to isolate the Backplanes.
Note Make sure that the C200HW-PA204C is wired correctly. The C200HW-
PA204C terminals are wired differently from other Power Supply Units.
• Do not share the PLC's ground with other equipment, such as motors and
inverters, or ground the PLC to the metal structure of a building. The con-
figuration shown in the following diagram may worsen operation.
AC100V-120V/
AC2100-240V/
INPUT
100-200
CLOSE
200-240
OPEN
LG (Noise-filter neutral terminal)
Ground this terminal to less than 100 Ω to improve
noise resistance and prevent electric shock.
DC24V/0.8A
OUTPUT
GR (Ground terminal)
Ground this terminal to less than 100 Ω to prevent
electric shock.
2
).
) is a noise-filtered neutral terminal. If
Section 5-3
) with
317