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FS 20/25 Operators Manual 901-10037001/1.1
Maintenance and Troubleshooting Page 5.
3
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
5. TROUBLESHOOTING AND MAINTENANCE
5.1 INTRODUCTION
This document is intended to provide a minimum level of instructions for the proper
handling, maintenance and troubleshooting of the FS Trawl Monitoring System. The
information is applicable to both the FS 20 and FS 20/25 systems.
5.2 SYSTEM OVERVIEW
The Simrad FS Trawl Monitoring System (both FS 20 and FS20/25 consists of
wheelhouse electronics and a trawl unit. The wheelhouse electronics include the
display unit, the FS 20/25 HP PC processing unit, and the PWR/TTM interface unit.
The trawl unit electronics includes the sonar head, sensor module, catch receiver
and up to four catch sensors. In addition to the above equipment, but not supplied
by Simrad, the system requires a winch with slip rings, and a trawl cable for
connection of the FS trawl unit to the wheelhouse electronics.
The system configurations for FS 20 and FS 20/25 are similar, but there are some
important differences. These differences are discussed in the following sections.
5.2.1 FS 20/25 System
The FS 20/25 PWR/TTM unit contains the Power Supply Module to provide the
60,120 or 200 Vdc @ 1A maximum for powering the trawl unit electronics, by means
of a rotary switch; voltage supplied and current draw are displayed on the front panel
voltage and ampere meters. The PWR/TTM unit also contains the Low-Frequency
Telemetry Adapter Sub-assemblies, “LF 1” and “LF 2”. For an FS20 system there
would only be an LF1 Sub-assembly installed; an FS20/25 would have both. These
Sub-assemblies serve a dual role; they are part of a “digital” link to establish
communication with the PC via the COM Port(s), as well as the direct “analog” link to
the Trawl Head via the 3
rd
wire (or test cable).
With the either the FS 20 or the FS 20/25 systems, the trawl cable connects directly
to the PWR/TTM unit rear panel. The COM Ports for the PC link are also on the rear
panel
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