“This document is intended as a guide only. Whilst the information it contains is believed to be correct, Emtelle can take no responsibility for actions taken based on the information contained in this document. Emtelle reserves the
right to make changes to this document without notice. All sales of product are subject to Emtelle’s terms and conditions of sale only, which can be found on Emtelle’s website.”
87
INNOVATION AND FLEXIBILITY
THE
INSTALLATION AND MAINTENANCE TRAINING MANUAL
9 Fibre blowing
9.11.4 Continuity Fault Finding
1. If the 5cm fibre length has not reached the other end of the microduct, then switch the air supply off and let the air bleed from the pressurised
microduct. Then, switch the air back on and wait a few minutes to see if the fibre emerges at the opposing end. DO NOT INCREASE THE AIR
PRESSURE ABOVE 4 BAR
2. If after some time doing the above, the fibre has still not emerged, then there is a possibility that one of the following has happened:-
a) CAUSE There is damage to the microduct at some point in the route to the extent that the fibre bead cannot pass through. Blow the fibre back
out of the microduct by following the directions at the bottom of the page.
REMEDY If there is damage to the microduct in the route somewhere, the easiest way to locate the damage is to blow a full length of fibre into
the microduct and when it stops, measure out the distance on the display of the blowing unit. Fix the fault and try blowing the 30cm
length of fibre again.
b) CAUSE The microduct has some water in it at some point and the fibre has become wet and will not travel down the microduct.
REMEDY Blow the fibre back out as per below and then blow water out using full pressure on the compressor.
c) CAUSE There is a series of very tight bends in the route somewhere.
REMEDY Straighten out the bends and try the test again.
Blowing the 5cm fi bre back out
To blow the 5cm length of fibre back out of the microduct, place the compressor at the end of the microduct and place the air filter at the start of the
route so that you are blowing the opposite way.
Follow exactly the same procedure as before. This time use a higher pressure (6 bar) to get the 5cm length of fibre out. Increase pressure slightly if
required, but do not exceed 7 bar.
Once the fibre has been removed, fix the problem by using one of the remedies above then repeat the continuity test.
To Next Page
Loading...