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MELSEC-Q
4 INSTALLATION, WIRING AND MAINTENANCE OF THE PRODUCT
4.3 Wiring
The precautions for wiring the QD75 are given below. Refer to this section as well as
"4.1.3 Handling precautions" when carrying out the work.
4.3.1 Precautions for wiring
!
DANGER
Switch all phases of the external power supply off when installing or placing wiring.
Not doing so may cause electric shock or damage to the product.
!
CAUTION
Check the layout of the terminals and then properly route the wires to the module.
Solder connector for external input signal cable and SSCNET cable device properly.
Insufficient soldering may cause malfunction.
Be careful not to let foreign matter such as sawdust or wire chips get inside the module.
These may cause fires, failure or malfunction.
The top surface of the module is covered with protective films to prevent foreign objects such as
cable off cuts from entering the module when 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.
Securely connect the connector for the SSCNET cable to the bottom connector on the module.
When removing the cable or power supply cable from the module, do not pull the cable. When
removing the cable with a connector, hold the connector on the side that is connected to the
module.
Pulling the cable that is still connected to the module may cause malfunction or damage to the
module or cable.
The cable used for connecting the QD75 external input signal cable and SSCNET cable should
not be routed near or bundled with the main circuit cable, power cable and/or other such load –
carrying cables other than those for the PLC. These cables should be separated by at least 100
mm (3.94 inch) They can cause electrical interference, surges and inductance that can lead to
mis-operation.
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