4INSTALLATION, WIRING AND MAINTENANCE OF THE PRODUCT

4.3 Wiring

MELSEC-Q

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.

4.3.1Precautions for wiring

(1)Always confirm the terminal layout before connecting the wires to the QD75. (For the terminal layout, refer to Section 3.4.2 "Signal layout for external device connection connector".)

(2)Correctly solder the external wiring connector. An incomplete soldering could lead to malfunctioning.

(3)Make sure that foreign matter such as cutting chips and wire scraps does not enter the QD75. Failure to observe this could lead to fires, faults or malfunctioning.

(4)A protective label is attached on the top of the QD75 to avoid foreign matter such as wire scraps from entering inside during wiring process. Do not remove the label until the wiring is completed. Before starting the system, however, be sure to remove the label to ensure heat radiation.

(5)Securely mount the external device connector to the connector on the QD75 with two screws.

(6)Do not disconnect the external wiring cable connected to the QD75 and the drive unit by pulling the cable section. When the cable has a connector, be sure to hold the connector connected to the QD75 and the drive unit. Pulling the cable while it is connected to the QD75 and the drive unit may lead to malfunctioning or damage of the QD75 and the drive unit or cable.

(7)Do not bundle or adjacently lay the connection cable connected to the QD75 external I/O signals or drive unit with the main circuit line, power line, or the load line other than that for the PLC. Separate these by 100mm as a guide. Failure to observe this could lead to malfunctioning caused by noise, surge, or induction.

(8)The shielded cable for connecting QD75 can be secured in place.

If the shielded cable is not secured, unevenness or movement of the shielded cable or careless pulling on it could result in damage to the QD75 or drive unit or shielded cable or defective cable connections could cause mis-operation of the unit.

(9)If the cable connected to the QD75 and the power line must be adjacently laid (less than 100mm), use a shielded cable. Ground the shield of the cable securely to the control panel on the QD75 side. (A wiring example is given on the next page.)

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Mitsubishi Electronics QD75P, QD75D user manual Wiring, Precautions for wiring