Siemens SIMATIC NET PROFIBUS - Manual (Page 299)

SIMATIC NET PROFIBUS Plastic Fiber Optic Installation Instructions for Simplex Connectors
Page 9
Fitting Simplex Connectors
Insert the cord into the simplex plug as
far as it will go Œ and close the clamp •.
Caution: The fiber must extend at least
1.5 mm beyond the end face of the
connector. Close the clamp until you hear the catch
lock in place. Repeat the same procedure for the
second cord.
Caution: Do not insert the connector into
a device socket, otherwise the excess
fiber length is liable to damage the
transmitter and receiver elements.
Grinding and Polishing Simplex Connectors
Cut off excessive fiber with scissors
leaving approximately 1.5 mm in length. Insert the simplex connector into the
polishing holder as far as it will go. Grind down the excess fiber by
describing a figure-of-eight on polishing
paper (600 grit) on a flat solid surface.
The polishing is completed when the
fiber is flush with the end face of the
connector.
Remove the debris from the polishing
holder and from the end face of the
connector using a clean cloth. Then polish the end face of the
connector by describing figures-of-eight
on the pink polishing foil (rough side).
Repeat the figure-of-eight movement
approximately 25 times.
Polishing reduces the attenuation by
approximately 2 dB (corresponds to
approximately 10 m cable length). With
short lengths of cable polishing is
unnecessary. Repeat the procedure with the second
connector and clean the surfaces of the
plug with a clean cloth.