Omron CJ2 User Manual page 140

5 Installation
Crimp Terminals
The terminals on the Power Supply Unit are M4, self-raising terminals with screws.
Precautions for Correct Use Precautions for Correct Use
• Use crimp terminals for wiring.
• Do not connect bare stranded wires directly to terminals.
• Tighten the terminal block screws to the torque of 1.2 N·m.
• Use crimp terminals (M4) having the dimensions shown below.
Crimp Terminals for DC Power Supplies
7 mm max.
Precautions for Safe Use
• Be sure not to reverse the positive and negative leads when wiring the power supply terminals.
• Supply power to all of the Power Supply Units from the same source.
• Do not remove the protective label from the top of the Unit until wiring has been completed.
This label prevents wire strands and other foreign matter from entering the Unit during wiring
procedures.
• Do not forget to remove the label from the top of the Power Supply Unit after wiring the Unit.
The label will block air circulation needed for cooling.
Grounding
PA205R
POWER
L1
AC100-240V
INPUT
L2/N
RUN
OUTPUT
AC240V
DC24V
• To help prevent electrical shock, ground the ground terminal (GR:
less than 100 Ω using a 14-gauge wire (minimum cross-sectional area of 2 mm
• The line ground terminal (LG:
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 CJ-series PLCs 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).
• Do not share the PLC's ground with other equipment or ground the PLC to the metal structure of a
building. The configuration shown in the following diagram may worsen operation.
5-22
7 mm max.
LG (Noise-filter neutral terminal)
Ground this terminal to less than 100 Ω
to improve noise resistance and prevent
electric shock.
GR (Ground terminal)
Ground this terminal to less than 100 Ω to
prevent electric shock.
) is a noise-filtered neutral terminal. If noise is a significant source of
) with a ground resistance of
2
).
CJ2 CPU Unit Hardware User's Manual