Mitsubishi Electric MELSEC L Series User Manual page 5

[Wiring Precautions]
● Individually ground the FG terminal of the programmable controller with a ground resistance of 100
ohms or less. Failure to do so may result in electric shock or malfunction.
● Tighten the terminal block screws within the specified torque range. Undertightening can cause short
circuit, fire, or malfunction. Overtightening can damage the screw and/or module, resulting in drop,
short circuit, 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 the film during wiring. Remove it for heat
dissipation before system operation.
● Mitsubishi Electric 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 methods, refer to the MELSEC-L CPU
Module User's Manual (Hardware Design, Maintenance and Inspection).
[Startup and Maintenance Precautions]
● Do not touch any terminal while power is on. Doing so will cause electric shock or malfunction.
● Shut off the external power supply (all phases) used in the system before cleaning the module or
retightening the terminal block screws. Failure to do so may result in electric shock.
[Startup and Maintenance Precautions]
● Do not disassemble or modify the module. Doing so may cause failure, malfunction, injury, or a fire.
● Shut off the external power supply (all phases) used in the system before mounting or removing a
module. Failure to do so may cause the module to fail or malfunction.
● Tighten the terminal block screws 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.
● After the first use of the product (module, display unit, and terminal block), the number of
connections/disconnections is limited to 50 times (in accordance with IEC 61131-2). Exceeding the
limit may cause malfunction.
● Before handling the module, touch a conducting object such as a grounded metal to discharge the
static electricity from the human body. Failure to do so may cause the module to fail or malfunction.
CAUTION
WARNING
CAUTION
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