User Manual

59
MN024-08
As shown in the previous table, the same red LED switches on to reveal any major failure.
Following the troubleshooting procedure reported hereinafter it is possible to better understand
what problem occurred
.
Quick troubleshooting procedure
(The following procedure is summarized by the flow-chart in fig. 3.27a)
In case the red LED is ON, please follow these steps:
1. First of all, refer to dry-contact troubleshooting in order to understand
whether the alarm can depend on any external equipment failure or not.
2. In case dry-contact troubleshooting has not revealed any failure, clean the
optical adapters
3. If the problem still persists, refer to the fibre optic DL troubleshooting to
check if optical cables or optical connections have any problem on DL path.
4. If previous actions didn’t make the LED switch off replace the unit with a
new one or contact for assistance.
Dry-contact troubleshooting
(The following procedure is summarized by the flow-chart in fig. 3.27b)
This procedure needs to be considered if at least one TFAx dry-contact is
connected to some external equipment. If not, return to main troubleshooting
procedure.
These steps aim to detect any failure inside the external equipment or inside
the dry-contact port. If dry-contacts don’t reveal equipment malfunction or a
port failure, return to the main troubleshooting procedure.
For any dry-contact connected to some external equipment, follow these
steps:
1. Disconnect it, and check the TFAx LED status after the disconnection.
2. If the red LED has switched off, external equipment connected to the dry
contact port should be faulty. Please test it.
3. If the TFAx red LED still remains on after the disconnection, measure
voltage between the terminals of the dry contact port.
a. If the terminals are electrically closed, the dry-contact port is
faulty. Contact the manufacturer for assistance.
b. If the terminals are open, this means neither the analysis of the
present dry contact nor the one of its external equipment has
revealed failures. Re-connect the present dry contact port to its
external equipment. In case the TFAx has another unchecked dry-
contact connected to some external equipment, apply the whole
procedure (ie steps 1-3) to this new port
Fibre optic DL troubleshooting
(The following procedure is summarized by the flow-chart in fig. 3.27c)
1. Check if there is any point where fibre experiences a short radius of
curvature. In this case, rearrange the optical path in order to avoid sharp
bends (if necessary, replace the optical cable with a longer one). If TFLN red
LED switches off, troubleshooting has been successfully carried out.
Otherwise, follow next steps.
2. Check if SC-APC connectors are properly installed at both fibre ends. In
case they are not, fix better SC-SPC connectors to adapters. If TFLN red
LED switches off, troubleshooting has been successful. Otherwise, follow
next steps.
TFAx
CaseB