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NorthStar Navigation
491 installation manual
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Contents
Main
Page
Table of Contents
Page
SECTION ONE Introduction
Welcome to the Northstar 491
Who should read this manual
Scope of this manual
Page
SECTION TWO Installing the transducer
Safety
NOTE:
CAUTION!
WARNING!
Selecting a transducer
Table 2: Airmar transducer elements
Table 1: Northstar-recommended transducers
Installation
Choosing a mounting location
Table 3: Hull thickness limits
FIGURE 1: Recommended installation locations for a transducer
Best location for the transducer
Installing the transducer
SECTION TWO Installing the transducer
PAGE 8 491 INSTALLATION MANUAL Revision A
FIGURE 2: Recommended transducer incline angle
FIGURE 3: Typical nished thru-hull installation with a fairing block (Airmar B744V)
Maintaining the transducer
Using anti-fouling paint
The transducer should be coated with water-based anti-fouling paint to prevent aquatic growth.
3 incline
Deadrise angle and fairing thickness (B44V shown)
Cleaning a transducer
Page
SECTION TH REE Installing the 491
Safety
WARNING!
CAUTION!
Page
System components
Figure 5: Echo sounder system components with the Northstar 961/962
Figure 6: Echo sounder system components with the Northstar 957/958/6000i
Choosing a mounting location
Mounting the 491
FIGURE 7: 491 mounting dimensions and connector locations
Wiring the 491
Electrical power requirements
to the 961/962
to ships power
FIGURE 8: Interface cable connection from 961/962 to 491
Table 4: Cable connection between the 961/962 and 491
to the 957/958/ 6000i
Figure 9: Interface cable connection from 957/958/6000i to 491
Table 5: Cable connection between the 957/958/6000i and 491
to a transducer
Table 6: 491-to-transducer connector pin wiring
Initial checkout
Turning the 491 on
FIGURE 10: Wiring of B260 transducer cable (solder-cup side of connector shown)
FIGURE 11: Wiring of B44/B744 and P66 transducer cable (solder-cup side of connector shown)
For the 957/958/6000i
Installation test checklist
SECTION FOUR Troubleshooting and servicing the 491
SECTION FOUR Troubleshooting and servicing the
PAGE 22 491 INSTALLATION MANUAL Revision A
Figure 12: 961/962 echo sounder system troubleshooting
SECTION FOUR Troubleshooting and servicing the
491 INSTALLATION MANUAL Revision A PAGE 23
Figure 13: 957/958/6000i echo sounder system troubleshooting
Getting technical support
Table 7: Contacting Northstar
Page
Returning a 491 for service
APPENDIX A Technical specications
Table 8: 491 technical specications
Table 8: 491 technical specications (Continued)
Glossary
Page
Index
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