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[Wiring Precautions]
[Startup and Maintenance Precautions]
CAUTION
● When removing the connected communication cables or power cables, do not pull the cable with
grasping the cable part.
Remove the cable connected to the terminal block after loosening the terminal block screws.
Pulling the cable connected to a module may result in malfunctions or damage of the module or
cable.
● Use applicable solderless terminals and crimp them with a tool specified by maker.
Imperfect connections could result in short circuit, fires, or erroneous operation.
● A protective film is attached to the top of the Q series safety relay module to prevent foreign matter
such as wire chips from entering the module during wiring.
Do not peel this label during wiring.
Before starting system operation, be sure to peel this label because of heat dissipation.
● Install our programmable controller in a control panel complying with the IP standard of 54 or more.
Wire the main power supply to the power supply module installed in a control panel through a
distribution terminal block.
Furthermore, the wiring and replacement of a power supply module have to be performed by a
maintenance worker who acquainted with shock protection.
For wiring method, refer to the QCPU User's Manual (Hardware Design, Maintenance and
Inspection).
● Do not install the control lines together with the communication cables or bring them close to each
other.
Doing so may cause a malfunction due to noise.
● Pay attention when using a flathead screwdriver to push the open/close button of the spring clamp
terminal block. Failure to do so can result in an injury.
WARNING
● Do not touch the terminals while power is on.
Doing so could result in electric shock.
● Turn off all phases of the external supply power used in the system when cleaning the module or
retightening the terminal block mounting screws, terminal screws, or module mounting screws.
Not doing so could result in electric shock.
Tighten a terminal block mounting screw and module mounting screw within the specified torque
range.
If the terminal block mounting 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 mounting screw is too loose, it may cause a drop of the screw or module.
Over tightening the screw may cause a drop due to the damage of the screw or module.