PRECAUTIONS
xxxiii
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.
â– 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 terminal blocks, connectors, Memory Cards, Option
Boards, Pulse I/O Modules, expansion cables, and other items with lock-
ing devices are properly locked into place.
• The sliders on the tops and bottoms of the Power Supply Unit, CPU Unit,
I/O Units, Special I/O Units, CPU Bus Units, and Pulse I/O Modules must
be completely locked (until they click into place) after connecting to adja-
cent Units.
â– Wiring
• Follow the instructions in hardware manual for your PLC to correctly per-
form wiring.
• 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.
• Mount terminal blocks and connectors only after checking the mounting
location carefully.
• 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.
• Do not apply voltages to the Input Units in excess of the rated input volt-
age. Excess voltages may result in burning.
• Always connect to a ground of 100 Ω or less when installing the Units. Not
connecting to a ground of 100 Ω or less may result in electric shock.
A ground of 100 Ω or less must be installed when shorting the GR and LG
terminals on the Power Supply Unit.
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