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MITSUBISHI CNC
(2) Cautions for using optical communication cable
Optical communication 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 G396-L□M 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 brake option of drive unit.
Read described item in 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 the optical communication cable, the appropriate length should be
selected with due consideration for the dimensions and arrangement of drive unit so that the cable bend
will not become smaller than the minimum bend radius in cable laying. When closing the door of control
box, pay careful attention for avoiding the case that optical communication cable is hold down by the
door and the cable bend becomes smaller than the minimum bend radius.
Lay the cable so that the numbers of bends will be less than 10 times.
(b) Bundle fixing
When using optical communication cable of 3m or longer, fix the cable at the closest part to the
connector with bundle material in order to prevent optical communication cable from putting its own
weight on CN1A/CN1B connector of drive unit. Optical cord should be given loose slack to avoid from
becoming smaller than the minimum bend radius, and it should not be twisted.
When tightening up the cable with nylon band, the sheath material should not be distorted. Fix the cable
with tightening force of 1 to 2kg or less as a guide.
When laying cable, fix and hold it in position with using cushioning such as sponge or rubber which does
not contain plasticizing material.
Never use vinyl tape for cord. Plasticizing material in vinyl tape goes into optical fiber and lowers the
optical characteristic. At worst, it may cause wire breakage. If using adhesive tape for cable laying, the
fire resistant acetate cloth adhesive tape 570F (Teraoka Seisakusho Co., Ltd) is recommended.
If laying with other wires, do not make the cable touched wires or cables made from material which
contains plasticizing material.
Minimum bend radius
For wiring inside panel: 25mm
For wiring outside panel: 50mm
wall