Omron CQM1H-CLK21 - Manual (Page 21)

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Applications Precautions 5
5 Applications Precautions
Observe the following precautions when using the Controller Link Unit.
!WARNING Failure to abide by the following precautions could lead to serious or possibly
fatal injury. Always heed these precautions.
• Always ground the system to 100
Ω
or less when installing the system to
protect against electrical shock.
• Always turn OFF the power supply or the backup power supply to the PLC
or the computer before attempting any of the following. Performing any of
the following with the power supply turned ON may lead to electrical
shock:
• Installing or removing the Controller Link Unit.
• Assembling the Units.
• Setting DIP or rotary switches.
• Connecting or disconnecting any cables or wiring.
• Connecting or disconnecting any terminal block.
!Caution Failure to abide by the following precautions could lead to faulty operation or
the PLC or the system or could damage the PLC or PLC Units. Always heed
these precautions.
• Always use the power supply voltages specified in the operation manuals.
An incorrect voltage may result in malfunction or burning.
• Take appropriate measures to ensure that the specified power with the
rated voltage and frequency is supplied. Be particularly careful in places
where the power supply is unstable. An incorrect power supply may result
in malfunction.
• Install external breakers and take other safety measures against short-cir-
cuiting in external wiring. Insufficient safety measures against short-cir-
cuiting may result in burning.
• Separate the line ground terminal (LG) from the functional ground termi-
nal (GR) on the Power Supply Unit before performing withstand voltage
tests or insulation resistance tests. Not doing so may result in burning.
• Do not attempt to disassemble, repair, or modify any Units. Any attempt to
do so may result in malfunction, fire, or electric shock.
• Install the Units properly as specified in the operation manuals. Improper
installation of the Units may result in malfunction.
• Be sure that all the mounting screws, terminal screws, and cable connec-
tor screws are tightened to the torque specified in the relevant manuals.
Incorrect tightening torque may result in malfunction.
• 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.