Mitsubishi Electric Melsec-Q172DCPU User Manual page 163

4 INSTALLATION AND WIRING
(4) 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 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 Motion controller 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
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.
Model name of SSCNET
MR-J3BUS M
MR-J3BUS M-A
MR-J3BUS M-B
cable wiring
cable 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)
cable
=015
=03 to 3
4 - 12
25(0.98)
Tension strength[N]
70
140
420 (Enforced covering cord)
980 (Enforced covering cord)