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MELSEC-Q
4 SETUP AND PROCEDURES BEFORE OPERATION
4
4 SETUP AND PROCEDURES BEFORE OPERATION
4.1 Handling Precautions
(1) Do not drop the module or subject it to heavy impact.
(2) Do not remove the PCB of the module from its case. Doing so may cause the
module to fail.
(3) Be careful not to let foreign particles such as swarf or wire chips enter the module.
They may cause a fire, mechanical failure or malfunction.
(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 ventilation.
(5) Tighten the terminal screws using torque within the following ranges. Loose
screws may cause short circuits, mechanical failures or malfunctions.
Screw location Clamping torque range
Module mounting screws (M3 screws) 36 to 48 N · cm
Terminal block screws (M3 screws) 42 to 58 N · cm
Terminal block mounting screws (M3.5 screws) 66 to 89 N · cm
(6) To mount the module on the base, securely insert the module fastening latch into
the fastening hole on the base. Improper installation may result in a module
malfunction, or may cause the module to fall off.