Sscnet Cable - Mitsubishi Electric MELSEC Q Series User Manual

4 INSTALLATION, WIRING, START-UP, AND MAINTENANCE
4.2.1 SSCNET cable
(1) Precautions of SSCNET
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, 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 and servomotor.
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 QD74MH or 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
MR-J3BUS M
MR-J3BUS M-A
MR-J3BUS M-B
(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 this section "(5) Specifications of SSCNET cable" 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 box or others.
cable wiring
Minimum bend radius [mm(inch)]
Enforced covering cord: 50 (1.97), Cord: 25 (0.98)
Enforced covering cord: 50 (1.97), Cord: 30 (1.18)
4 - 4
MELSEC-Q
25(0.98)