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3. INSTALLATION AND WIRING
(4) Precautions of 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. Especially, as optical fiber for MR-J3BUS
M and MR-J3BUS M-A is made of synthetic resin, it
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 option of servo amplifier, or servo motor.
Be sure to use optical fiber within the range of operating temperature described in this manual.
Read described item of this section carefully and handle it with caution.
(a) Minimum bend radius
Make sure to lay the cable with greater radius than the minimum bend radius. Do not press the cable to
edges of equipment or others. For SSCNET
cable, the appropriate length should be selected with due
consideration for the dimensions and arrangement of position board and servo amplifier. When closing
the door of control panel, pay careful attention for avoiding the case that SSCNET
cable is hold down
by the door and the cable bend becomes smaller than the minimum bend radius.
Model name of SSCNET cable Minimum bend radius[mm(inch)]
MR-J3BUS M 25(0.98)
MR-J3BUS M-A
Enforced covering cord : 50 (1.97)
Cord : 25 (0.98)
MR-J3BUS M-B
Enforced covering cord : 50 (1.97)
Cord : 30 (1.18)
(b) Tension
If tension is added on the 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 cable laying, handle without putting forced tension. (Refer to "APPENDIX 6.1 SSCNET
cables" for the tension strength.)
(c) Lateral pressure
If lateral pressure is added on the SSCNET
cable, the 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). Do not trample it down or tuck it down with the door of control panel or
others.
(d) Twisting
If SSCNET
cable is twisted, it will become the same stress added condition as when local lateral
pressure or bend is added. Consequently, transmission loss increases, and the breakage of SSCNET
cable may occur at worst.
(e) Disposal
When incinerating optical cable (cord) used for SSCNET
cable, hydrogen fluoride gas or hydrogen
chloride gas which is corrosive and harmful may be generated. For disposal of SSCNET
cable,
request for specialized industrial waste disposal services who has incineration facility for disposing
hydrogen fluoride gas or hydrogen chloride gas.