NorthStar Navigation 491 installation manual Section ONE Introduction, Welcome to the Northstar

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SECTION ONE — Introduction

Welcome to the Northstar 491

An echo sounder is a device that provides information about the water directly beneath a vessel. The Northstar echo sounder system consists of:

the Northstar 491 echo sounder sensor

a Northstar navigation system such as the 962, 958 or 6000i

a transducer

The 491 can be used with either a single-element transducer or a dual-element transducer. The 491 automatically pings both transmitters at power-up to determine the number of transducer elements connected. If a single element is detected, the 491 operates in single-frequency or dual-frequency interleaved mode (as determined by the operator) at 600 Watts. If two elements are detected, the 491 uses both elements at 1000 Watts.

Installation and setup procedures are different for the two basic types of Northstar navigators. The following terminology should be carefully fol- lowed:

the term 961/962 indicates instructions that apply to the Northstar 961 and the 962 navigators

the term 957/958/6000i is used for these units

the term navigator by itself identifies information that applies to all units

Who should read this manual

Scope of this manual

This manual is for marine technicians who are installing the Northstar 491 and connecting it to a Northstar navigator and a transducer.

In this manual, you’ll find information about the following:

mounting and wiring the 491

connecting the 491 to the Northstar navigator

installing a transducer (an overview is provided, but for such details as wiring, see the documentation provided by the transducer’s man- ufacturer)

491 INSTALLATION MANUAL Revision A

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Contents Echo Sounder Installation Manual Page Table of Contents Page Who should read this manual Scope of this manual Section ONE IntroductionWelcome to the Northstar Installation considerations Safety considerations Section TWO Installing the transducerAirmar transducer elements Northstar-recommended transducersDo not mount the transducer Choosing a mounting locationHull thickness limits LWL Installing the transducerLWL Using anti-fouling paintDetail Cleaning a transducerPage Section Three Installing Section Three Installing Installation Manual Revision a Echo sounder system components with the Northstar 961/962 System components190 dia 360 dia MountingConnecting the 491 to the 961/962 WiringInterface cable connection from 961/962 to Cable connection between the 961/962Connecting the 491 to the 957/958 491-to-transducer connector pin wiring Connecting the 491 to a transducerFor the 961/962 Initial checkoutTurning the 491 on Setting up the echo sounder Installation test checklistTurning the 491 off For the 957/958/6000iStatus LED Section Four Troubleshooting and servicing961/962 echo sounder system troubleshooting 957/958/6000i echo sounder system troubleshooting Contacting Northstar Getting technical supportHearing from you Ordering replacement parts ServicingReturning a 491 for service 491 technical specifications Appendix a Technical specificationsON/OFF Cavitation Deadrise Echo sounder Fairing block Transducer GlossaryGlossary Installation Manual Revision a Index 491 Index Index Installation Manual Revision a