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MELSEC-Q
4 INSTALLATION, WIRING AND MAINTENANCE OF THE PRODUCT
4.2 Installation
4.2.1 Precautions for installation
The precautions for installing the QD75MH are given below. Refer to this section as
well as "4.1.3 Handling precautions" when carrying out the work.
[1] Precautions for SSCNET cable wiring
SSCNET cable is made from optical fiber. If optical fiber is added a power
such as a major shock, lateral pressure, haul, sudden bending or twist, its inside
distorts or breaks, and optical transmission will not be available. Make sure to
use optical fiber within the range of operating temperature described in this
manual. The optical cable and code part melts down if being left near the fire or
high temperature. Therefore, do not make it touched the part which becomes
high temperature, such as radiator or regenerative brake option of servo
amplifier, or servomotor.
(1) Minimum bend radius
Make sure to lay SSCNET cable with greater radius than the minimum
bend radius.
If the SSCNET
cable is less than the minimum bend radius, optical
transmission is interrupted and it may cause malfunctions.
SSCNET cable Minimum bend radius [mm] ([inch])
MR-J3BUS M 25
MR-J3BUS M-A
Reinforcement film cable : 50 (1.97)
Code part : 25 (0.98)
MR-J3BUS M-B
Reinforcement film cable : 50 (1.97)
Code part : 30 (1.18)
(2) Tension
If tension is added on SSCNET cable, the increase of transmission loss
occurs because of external force which concentrates on the fixing part of
SSCNET
cable or the connecting part of SSCNET connector. At
worst, the breakage of SSCNET
cable or damage of SSCNET
connector may occur. For SSCNET
cable laying, handle without putting
forced tension. (For the tension strength, refer to section Appendix 3.1
Connection of SSCNET
cables.)
(3) Lateral pressure
If lateral pressure is added on optical cable, the SSCNET cable itself
distorts, internal optical fiber gets stressed, and then transmission loss will
increase. At worst, the breakage of SSCNET
cable may occur. As the
same condition also occurs at cable laying, do not tighten up SSCNET
cable with a thing such as nylon band (TY-RAP).