Sscnet Iii Cable Laying - Mitsubishi Electric FR-A7NS Instruction Manual

Plug-in option sscnet iii communication function 700 series
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WIRING
3.3.1

SSCNET III cable laying

SSCNET ΙΙΙ cable is made of optical fiber. Application of a power, such as a major shock, lateral pressure,
haul, and abrupt bending or twisting, to the optical fiber will deform or break the inside, disabling optical
transmission. Especially, the optical fibers of the MR-J3BUS M, MR-J3BUS M-A which is made of
synthetic resin will melt down if exposed to fire and high temperature. Therefore, avoid the cable from
contacting with the hot section such as heatsink of the inverter and an option for regeneration.
Read described item of this subsection carefully and handle it with caution.
(1) 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 ΙΙΙ cable, the appropriate length should be selected with due
consideration for the dimensions and arrangement of inverter. Ensure that the cable bend will not become
smaller than the minimum bend radius if the SSCNET ΙΙΙ cable is pressed down when the door of the
enclosure is closed.
For the minimum bend radius, refer to page 21.
(2) Bundle fixing
Use the accessory cable tie to bundle the SSCNET ΙΙΙ cable outside the inverter, and fix the bundled cable
to the installation surface of the inverter. Fix the SSCNET ΙΙΙ cable using a cable tie by gently slackening
the optical code with keeping a larger radius than the minimum bend radius, and it should not be twisted.
(Refer to page 31.) When binding the cable with a cable tie other than the provided one, use a cushioning
material such as plasticizer-free sponge and rubber to fix it.
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 soft polyvinyl chloride
(PVC), polyethylene resin (PE), teflon (Fluorocarbon resin) or nylon which contains plasticizing material.
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