Mitsubishi Electric MELSEC-L SSCNETIII/H User Manual page 52

(4) Precautions for wiring the SSCNET III cable
The SSCNET III cable uses optical fibers. If a severe impact, lateral pressure, a hard pull, sudden bending, or a
twist is exerted on the optical fibers, its inside distorts or breaks, and optical transmission may become
unavailable. Especially, MR-J3BUSM and MR-J3BUSM-A are made of synthetic resin, it melts if left near fire
or a high temperature.
Therefore, do not let the fibers come into contact with a part having a high temperature during operation, such as
the radiator and the regenerative option of a servo amplifier, and a servo motor.
Use the optical fibers within the range of the operating temperature described in the manual for the Motion
controller used. Read this section carefully and handle the fibers with caution.
(a) Minimum bend radius
Lay the cables keeping the minimum or a larger bend radius. Do not press the cable against edges of
equipment or other pointed objects. Keep an appropriate length for the SSCNET III cable with the
consideration for the dimensions and arrangement of the head module, so that the cable keeps at least the
minimum bend radius when laid. When closing the door of a control panel, secure the SSCNET III cable
against being held down by the door and consequently having a bend radius smaller than the required
minimum.
Model names of the SSCNET III
cable
MR-J3BUSM
MR-J3BUSM-A
MR-J3BUSM-B
(b) Tension
If tension is exerted on the SSCNET III cable, transmission loss increases because external forces concentrate
on a fixed part of the SSCNET III cable or where the SSCNET III connectors are connected. At worst, the
SSCNET III cable breaks or the SSCNET III connectors are damaged. When laying the cable, handle without
straining tension.
(c) Lateral pressure
If lateral pressure is exerted on the SSCNET III cable, the cable distorts, the internal optical fibers get stressed,
and transmission loss increases. At worst, the SSCNET III cable may break. Being tied in a bundle also causes
such state. Do not tighten up the SSCNET III cable with bands such as a nylon band (TY-RAP).
Do not trample the cable, let the cable be caught by the door of a control panel or other possible situations.
(d) Twisting
If the SSCNET III cable is twisted, the same stress as that localized lateral pressure or bending exerts is
exerted. Such condition increases transmission loss and at worst, the SSCNET III cable breaks.
(e) Disposal
Hydrogen fluoride or hydrogen chloride gas, corrosive and harmful, may be generated when the optical cable
(cord) used for the SSCNET III cable is incinerated.
When disposing the SSCNET III cable, make a request to a company treating industrial waste which has an
incineration facility for treating hydrogen fluoride and hydrogen chloride gas.
50
Minimum bend radius [mm]
25
Reinforcement coated cable: 50, Cord: 25
Reinforcement coated cable: 50, Cord: 30