User guide

FS 20/25 Operators Manual 901-10037001/1.1
Maintenance and Troubleshooting Page 5.
9
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
For additional information on connecting to slip rings and examples of splicing trawl
cable, refer to Part 7 “Attachments”.
5.4 MONITORING SYSTEM PERFORMANCE
There are a number of tools available with the Simrad FS Trawl Monitoring system
that allow its performance to be checked. When these tools are utilized as part of
the regular maintenance, they provide information about the state of the system and
allow it to be monitored. This can be valuable in detecting problems before they
cause an FS system failure.
5.4.1 Test Cable
With every FS Trawl Monitoring system, a 50’ test cable is supplied for testing the
system without requiring the trawl cable. This provides a quick and simple way of
verifying whether problems are due to the trawl cable or winch slip rings. In addition,
system performance values that are measured on the test cable provide a base for
which performance values measured later (using either the test cable or trawl cable)
can be compared to.
For either the FS 20 or FS 20/25 systems, the trawl cable and test cable are both
connected to the 3-pin connector on the rear panel of the PWR/TTM unit. To install
the test cable, disconnect the trawl cable and attach the test cable. Refer to Part 6
“Drawings” for more information and interconnection drawings. You will probably be
required to bring the deployment package to the wheelhouse.
The PWR/TTM unit has four settings, controlled by the rotary switch on the front
panel, that supply power out to the deployment package by either the full 3
rd
wire
(trawl) or the test cable. The power supply output voltages can be set to:
• “OFF” no voltage on the trawl/test cable
• “TEST” 56Vdc on the trawl/test cable
• “FS 20” 120Vdc on the trawl/test cable
• “FS25” 200Vdc on the trawl/test cable
If you are going to run an FS 900/925 deployment package on a test cable in the
wheelhouse, you could run it with the switch in the “FS25” position for a “short”
period of time, but it will start to run hot fairly quickly. The preferred setting would be
“FS20” which would allow a much longer continuous operation without having the
FS925 head run too hot. It also does not matter what kind of Vertical Head is being
powered by the FS925 (FS3300, TS10, TS15 or TS15 S). It is unlikely that a fully
loaded FS925 would run in the “TEST” position, even on the test cable (not
recommended).