Mitsubishi Electric MELSEC iQ-R Series Safety Manual page 6

[Wiring Precautions]
WARNING
● Shut off the external power supply (all phases) used in the system before wiring.
Failure to do so may result in electric shock or cause the module to fail or malfunction.
● After installation and wiring, attach the included terminal cover to the module before turning it on for
operation. Failure to do so may result in electric shock.
[Wiring Precautions]
CAUTION
● Individually ground the FG and LG terminals of the programmable controller with a ground resistance
of 100 ohms or less. Failure to do so may result in electric shock or malfunction.
● For terminal block wiring, use solderless terminals with an insulation sleeve. Do not connect more
than two solderless terminals to a terminal.
● 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.
● Check the rated voltage and terminal 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 a fire
or failure.
● Tighten a terminal block mounting screw, terminal screw, and module fixing screw within the specified
torque range. If the terminal block mounting screw or terminal screw is too loose, it may cause a short
circuit, fire, or malfunctions. If too tight, it may damage the screw and/or the module, resulting in a
drop of the screw or module, a short circuit or malfunctions. If the module fixing screw is too loose, it
may cause a drop of the screw or module. Overtightening the screw may cause a drop due to the
damage of the screw or module.
● For the wire strip length, meet the specifications in a manual. The wire strip length is too long, it may
cause the electric shock and short circuit between terminals due to spreading out the conductive part
to the front of terminal block. The wire strip length is too short, it may cause the poor contact for the
spring clamp terminal block.
● Observe the following precautions when the spring clamp terminal block tool is used. Failure to do so
may cause the damage of the spring clamp terminal block or terminal block resin part.
(1) Use the dedicated spring clamp terminal block tool.
(2) Insert the spring clamp terminal block tool to the tool insertion opening vertically.
● Prevent foreign matter such as dust or wire chips from entering the module. Such foreign matter can
cause a fire, failure, or malfunction.
● 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.
● 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.
● When disconnecting the cable from the module, do not pull the cable by the cable part. 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.
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