User guide

901-10037001/1.1 FS 20/25 Operators Manual
Page 5.16 Maintenance and Troubleshootin
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Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
5.5.2 Diagnosing Problems
As previously mentioned, the PC based FS Trawl Systems are more complex than
prior systems to pinpoint a specific fault. The primary emphasis must be placed on
determining initially if the problem can be traced to something other than the specific
FS equipment itself. You must eliminate the cable, pigtail connections, slip
rings and wheelhouse to slip ring cable as the source(s) of the problems.
If the FS system develops a problem (or if it fails completely), and before you start
swapping out FS units, the steps below should be followed:
• Check the power supply unit meters. If the system PWR/TTM unit won’t power
up, ensure that all voltage switches are in the correct operating positions (i.e.
ON, and at the proper power level). If the system develops a problem or fails
while operating, then note the voltage and current meter behaviors. If the
current meter jitters, then stop the trawl winch, if rotating, and note any changes
in the meter values or their behavior.
• Monitor the System Error Message Log, as described in Section 5.4.4. The
description of the errors may assist in determining the area of the system where
the fault is occurring.
• Make an evaluation of whether you consider the fault to be intermittent (i.e.
occurs periodically), or if the fault is “hard”. “STOP” (Icon) operation of the FS
system, turn the PWR/TTM unit off and power back up after a two-minute wait
period. “RUN” (Icon) to restart the FS system. If the system does not run up
properly, consider the fault hard and proceed to the next step.
• Disconnect the trawl unit from the trawl cable and re-connect to the FS system
using the test cable. Power up the system and observe if the system powers up
and operates correctly. IF the fault is still “hard”, then the problem will almost
surely be in one of the FS units. If the unit runs up correctly, and does this
several times correctly and runs for a period of time on the test cable, you have
proven that the FS system will operate on the test cable. Some other outside
influence is acting on the system to cause the hard failure. Even if you
evaluated the fault as “intermittent”, running the deployment package on the test
cable would be a step in the fault finding process.
Note!
If a Simrad FS unit is diagnosed as being faulty, then the unit(s)
should be returned to an authorized Simrad service center. ALL
system performance results and a complete description of the
problem should be supplied with the defective unit to assist in
its repair.