MITSUBISHI ELECTRIC Mitsubishi Programmable Logic Controller QD75D - Manual (Page 80)

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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
(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.)