Installation; Handling Precautions; Installation Environment - Mitsubishi MELSEC-Q Series User Manual

7 PROCEDURE BEFORE STARTING THE DATA LINK

7.2 Installation

7.2.1 Handling precautions

7.2.2 Installation environment

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The following section explains the precautions when handling the master and local
modules, from the time they are unpacked until they are installed.
For more details on the module installation, see the user's manual for the PLC CPU
used.
(1) Do not drop the module case or subject it to heavy impact since it is made of
resin.
(2) Do not remove the PCB of each module from its case. This may cause a
failure in the module.
(3) Be careful not to let foreign objects such as wire burrs enter the module
during wiring. In the event any foreign object enters, remove it immediately.
(4) The top surface of the module is covered with a protective film to prevent
foreign objects such as wire burrs from entering the module during wiring.
Do not remove this film until the wiring is complete. Before operating the
system, be sure to remove the film to provide adequate heat ventilation.
(5) Solderless terminals with insulation sleeve cannot be used for the terminal
block. It is recommended that the wiring connecting sections of the
solderless terminals will be covered with a marking tube or an insulation
tube.
(6) Always make sure to touch the grounded metal to discharge the electricity
charged in the body, etc., before touching the module.
Failure to do so may cause a failure or malfunctions of the module.
(7) Tighten the module mounting screws and terminal screws using torque
within the following ranges.
Screw location
Module mounting screws (M3 screws)
Terminal block screws (M3 screws)
Terminal block mounting screws (M3.5 screws)
POINT
(1) Be sure to turn off the power supply to the applicable station before installing or
removing the terminal block.
If the terminal block is installed or removed without turning off the power supply
to the applicable station, correct data transmission cannot be guaranteed.
(2) Always make sure to power off the system in advance when removing the
terminating resistor to charge the system. If the terminating resistor is removed
and mounted while the system is energized, normal data transmission will not
be guaranteed.
For further details, see the user's manual for the PLC CPU used.
MELSEC-Q
Tightening torque range
36 to 48 N · cm
42 to 58 N · cm
66 to 89 N · cm
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