Omron CJ - REFERENCE MANUAL 10-2009 Reference Manual page 33

CS/CJ/NSJ Series Instructions Reference Manual (W474)
• Observe the following precautions when using a Power Supply Unit that
supports the Replacement Notification Function.
• Replace the Power Supply Unit within six months if the display on the
front of the Power Supply Unit alternates between 0.0 and A02, or if
the alarm output automatically turns OFF.
• Keep the alarm output cable separated from power line and high-volt-
age lines.
• Do not apply a voltage or connect a load exceeding the specifications
to the alarm output.
• When storing the Power Supply Unit for more than three months, store
it at 20 to 30 C and 25% to 70% humidity to preserve the Replace-
ment Notification Function.
• If the Power Supply Unit is not installed properly, heat buildup may
cause the replacement notification signal to appear at the wrong time
or may cause interior elements to deteriorate or become damaged.
Use only the standard installation method.
• Do not touch the terminals on the Power Supply Unit immediately after
turning OFF the power supply. Residual voltage may cause electrical
shock.
■ Installation
• Do not install the PLC near sources of strong high-frequency noise.
• Before touching a Unit, be sure to first touch a grounded metallic object in
order to discharge any static build-up. Not doing so may result in malfunc-
tion or damage.
• Be sure that the connectors, terminal blocks, expansion cables, and other
items with locking devices are properly locked into place. Improper locking
may result in malfunction.
• The sliders on the tops and bottoms of the Power Supply Unit, CPU Unit,
I/O Units, Special I/O Units, and CPU Bus Units must be completely
locked (until they click into place) after connecting to adjacent Units. The
Unit may not operate properly if the sliders are not locked in place.
• Always attach the End Cover that comes with the CPU Unit to the right
end of the CPU Rack. The PLC will not operate correctly if the End Cover
is not attached.
■ Wiring
• Wire all connections correctly.
• Double-check all wiring and switch settings before turning ON the power
supply. Incorrect wiring may result in burning.
• Be sure that all terminal screws, and cable connector screws are tight-
ened to the torque specified in the relevant manuals. Incorrect tightening
torque may result in malfunction.
• Do not apply a force exceeding 100 N to the terminal block when tighten-
ing it.
• Mount Units only after checking terminal blocks and connectors com-
pletely.
• Leave the label attached to the Unit when wiring. Removing the label may
result in malfunction if foreign matter enters the Unit.
• Remove the label after the completion of wiring to ensure proper heat dis-
sipation. Leaving the label attached may result in malfunction.
• Use crimp terminals for wiring. Do not connect bare stranded wires
directly to terminals. Connection of bare stranded wires may result in
burning.
PRECAUTIONS
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