Precautions For Safe Use - Omron CJ1W-EIP21 Operation Manuals

Precautions for Safe Use

Precautions for Safe Use
Disassembly and Dropping
• Do not attempt to disassemble, repair, or modify any Units. Doing so may result in malfunction or fire.
• Do not drop any Unit or subject it to abnormal vibration or shock. Doing so may result in Unit malfunc-
tion or burning.
Mounting
• The sliders on the tops and bottoms of the Power Supply Unit, CPU Unit, I/O Units, and other Units
must be completely locked (until they click into place) after connecting the adjacent Unit connectors.
Installation
• Always connect to a ground of 100 Ω or less when installing the Units. A ground of 100 Ω or less must
be installed when shorting the GR and LG terminals on the Power Supply Unit.
Wiring
• Follow the instructions in this manual to correctly perform wiring.
Double-check all wiring and switch settings before turning ON the power supply.
• Use crimp terminals for wiring.
Do not connect bare stranded wires directly to terminals.
• Do not pull on the cables or bend the cables beyond their natural limit.
Do not place heavy objects on top of the cables or other wiring lines. Doing so may break the cables.
• Mount terminal blocks and connectors only after checking the mounting location carefully.
Be sure that the terminal blocks, expansion cables, and other items with locking devices are properly
locked into place.
• Always remove any dustproof labels that are on the top of the Units when they are shipped before
you turn ON the power supply. If the labels are not removed, heat will accumulate and malfunctions
may occur.
• Before you connect a computer to the CPU Unit, disconnect the power supply plug of the computer
from the AC outlet. Also, if the computer has an FG terminal, make the connections so that the FG
terminal has the same electrical potential as the GR terminal on the Power Supply Unit. A difference
in electrical potential between the computer and Controller may cause failure or malfunction.
• If the external power supply to an Output Unit or slave has polarity, connect it with the correct polarity.
If the polarity is reversed, current may flow in the reverse direction and damage the connected
devices regardless of the operation of the Controller.
Power Supply Design
• Do not exceed the rated supply capacity of the Power Supply Units in the NJ-series Controller. The
rated supply capacities are given in the NJ-series CPU Unit Hardware User's Manual (Cat. No.
W500).
If the capacity is exceeded, operation may stop, malfunctions may occur, or data may not be backed
up normally for power interruptions.
Use NJ-series Power Supply Units for both the NJ-series CPU Rack and Expansion Racks.
Operation is not possible if a CJ-series Power Supply Unit is used with an NJ-series CPU Unit or an
NJ-series Power Supply Unit is used with a CJ-series CPU Unit.
24 CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)