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901-10037001/1.1 FS 20/25 Operators Manual
Page 5.4 Maintenance and Troubleshootin
g
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
5.2.2 Trawl Cable Requirements
For whatever cable type and length used, the following specifications must be met
for operation with the Simrad FS Trawl Monitoring system:
Cable Closed Loop Resistance: <100
Signal Attenuation Through Cable: <40 dB (1/100 signal amplitude) @ 55 kHz
<20 dB (1/10 signal amplitude) @ 12 kHz
The cable closed loop resistance determines the maximum voltage drop along the
trawl cable. For proper operation, the trawl unit electronics require 55 - 140 Vdc @
1A maximum. For typical operation, the current is approximately 300mA with peaks
to 500mA.
Compensation for signal losses over the long trawl cable is done automatically within
the HP/PC processor unit each time it is powered up. In this way, changes to the
cable losses do not affect the intensity of the sonar return displayed.
5.3 HANDLING & MAINTENANCE
The most common causes of failures to the Simrad FS Trawl Monitoring system are:
Trawl cable and/or winch slip ring problems.
Sonar head and sensor module connector and interconnect cable failures, or
Excessive impacts and/or physical damage to trawl unit electronics.
In all three of these cases, proper handling and maintenance can significantly
reduce the frequency of FS failures.
The following sections outline the recommended handling and maintenance for the
FS system.
5.3.1 Wheelhouse Electronics
Once installed, these units require little maintenance other than removing dust. A
damp, lint-free cloth should be used for this purpose. Note also that it is absolutely
essential that these units are receiving proper ventilation, particularly if the boat is
operating in warm climate locations.
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