YOKOGAWA F3LR02-0N, User Manual

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B4-16
IM 34M06H45-01E 7th Edition : Aug.30, 2019-00
B4.4.3 Precautions When Connecting Fiber-optic Cables
Handle fiber-optic cables with care.
Before laying fiber-optic cables, read manuals available from Sumitomo Electric
Industries. Engage a professional contractor specializing in laying fiber-optic cables.
Read “Documents on How to Lay Fiber-optic Cables” under “Introduction” of this manual
and the “Fiber-optic Cable Laying Instructions” (IM34M06C92-01E).
CAUTION
Always connect and disconnect fiber-optic cables when the system is offline. Connecting
or disconnecting fiber-optic cables when the system is online may affect normal system
operation.
Note
- Never touch the core of optical connectors with your bare hands and protect them
from dirt and dust.
Dust, dirt and oil from hands may result in degraded transmission performance or
even communications error.
Attach the cover during storage.
- When laying fiber-optic cords or fiber-optic cables, keep the elongation within 0.7%
of permissible elongation percentage. When the cable is secured, the elongation
should be within 0.2% of permissible elongation percentage.
Beyond these elongation limits, fiber-optic cables may break.
For this purpose, refer to Table 4.9 and take care not to subject fiber-optic cables to
excessive tensile impact, bending or twisting. Always pull a fiber-optic cable by its
tension member.
Table B4.9 General Mechanical Characteristics for Fiber-optic Cords and Cables
Type Tensile Strength (N) Bending Radius (mm) Lateral Pressure Twisting
Fiber-optic Cord
During laying < 98
When secured = 0 During laying = 15 min.
When secured = 50 min.

< 180
°
/2 m
Fiber-optic Cable
During laying < 735
When secured = 0
During laying = 50 min.
When secured = 100
min. 980 N/50 mm
(Should be
temporary) < 90
°
/2 m
You should strictly observe the restrictions on permissible tensile load specified in the
catalog or technical specification of fiber-optic cables when laying cables.
When securing cables, do not subject connectors and cables to tensile force.
For on-site treatment, we recommend using crimp-on cutting type connectors.
- Bending radius limits for fiber-optic cables
When connecting fiber-optic cables, you must secure tension members and strictly
observe allowable bending radius limits.
r
83.2
85.5
a
FB0449.VSD
Bending Radius, r (mm)
Fiber-optic cord
15 or larger 50 or larger
Fiber-optic cable
— —
15 or larger
50 or larger
KF-07 (a=18.3) CF-2071, CF-2071H (a=35.0)
100 or larger
During
Installation
(temporary)
When
Secured
During
Installation
(temporary)
When
Secured
50 or larger