Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 5

[Wiring Precautions]
• Shut off the external power supply (all phases) used in the system before installation and wiring.
Failure to do so may result in electric shock or damage to the product.
• Individually ground the FG terminal of the programmable controller with a ground resistance of
100 or less.
Failure to do so may result in electric shock malfunction.
• Check the rated voltage and terminal layout before wiring to the terminal block for the external
power supply, and connect the cable correctly.
Connecting a cable to power supply with a different voltage rating or incorrect wiring may cause
a fire or failure.
• Tighten the terminal screw within the specified torque range.
Undertightening can cause drop of the screw, short circuit or malfunction.
Overtightening can damage the screw and/or module, resulting in drop, short circuit, or
malfunction.
• Properly solder the parts of a soldering-type coaxial cable connector. Incomplete soldering may
result in malfunction.
• Crimp the parts of a crimping-type coaxial cable connector with proper force at a proper position.
Failure to do so may cause drop of the cable or malfunction.
• 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 this film during wiring.
Remove it for heat dissipation before system operation.
• Place the cables in a duct or clamp them.
Failure to do so may cause damage of the module or the cables due to accidental pull or
unintentional shifting of the cables, or malfunctions due to poor contact of the cable.
• Do not install the control lines or communication cables together with the main circuit lines or
power cables.
Keep a distance of 100mm or more between them.
Failure to do so may result in malfunction due to noise.
• When disconnecting the communication and power cables from the module, do not pull the
cable by the cable part. Loosen the screws of connector before disconnecting the cable. When
disconnecting a cable connected to a terminal block, loosen the screws on the terminal block
first before removing the cable.
Failure to do so may result in damage to the module or cable or malfunction due to poor contact.
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WARNING
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CAUTION
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