Mitsubishi Electric MELSEC iQ-R Series Migration Manual page 8

[Wiring Precautions]
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Individually ground the FG and LG terminals of the programmable controller with a ground
resistance of 100 ohm or less. Failure to do so may result in electric shock or malfunction.
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Use applicable solderless terminals and tighten them within the specified torque range. If any
spade solderless terminal is used, it may be disconnected when the terminal screw comes
loose, resulting in failure.
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Check the rated voltage and signal layout before wiring to the module, and connect the cables
correctly. Connecting a power supply with a different voltage rating or incorrect wiring may
cause fire or failure.
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Connectors for external devices or coaxial cables must be crimped or pressed with the tool
specified by the manufacturer, or must be correctly soldered. Incomplete connections may
cause short circuit, fire, or malfunction.
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Securely connect the connector to the module. Poor contact may cause malfunction.
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Do not install the control lines or communication cables together with the main circuit lines or
power cables. Keep a distance of 100 mm or more between them. Failure to do so may result in
malfunction due to noise.
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Place the cables in a duct or clamp them. If not, dangling cable may swing or inadvertently be
pulled, resulting in damage to the module or cables or malfunction due to poor contact. Do not
clamp the extension cables with the jacket stripped. Doing so may change the characteristics of
the cables, resulting in malfunction.
●
Check the interface type and correctly connect the cable. Incorrect wiring (connecting the cable
to an incorrect interface) may cause failure of the module and external device.
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Tighten the terminal screws or connector screws within the specified torque range.
Undertightening can cause drop of the screw, short circuit, fire, or malfunction. Overtightening
can damage the screw and/or module, resulting in drop, short circuit, fire, or malfunction.
●
When disconnecting the cable from the module, do not pull the cable by the cable part. For the
cable with connector, hold the connector part of the cable. For the cable connected to the
terminal block, loosen the terminal screw. Pulling the cable connected to the module may result
in malfunction or damage to the module or cable.
●
Prevent foreign matter such as dust or wire chips from entering the module. Such foreign matter
can cause a fire, failure, or malfunction.
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A protective film is attached to the top of the module to prevent foreign matter, such as wire
chips, from entering the module during wiring. Do not remove the film during wiring. Remove it
for heat dissipation before system operation.
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Programmable controllers must be installed in control panels. Connect the main power supply
to the power supply module in the control panel through a relay terminal block. Wiring and
replacement of a power supply module must be performed by qualified maintenance personnel
with knowledge of protection against electric shock. For wiring, refer to the MELSEC iQ-R
Module Configuration Manual.
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For Ethernet cables to be used in the system, select the ones that meet the specifications in the
user's manual for the module used. If not, normal data transmission is not guaranteed.
CAUTION
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