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491 ECHO SOUNDER
INSTALLATION MANUAL
Rev A
Part Number GM495
Northstar
a unit of Brunswick New Technologies Marine Electronics www.NorthstarNav.com
30 Sudbury Road Service: 978/897-6600
Acton, Massachusetts 01720 Sales: 800/628-4487
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Table of Contents SECTION ONE — Introduction - - - - - - - - - - - - - - - - - - - - 1 Welcome to the Northstar 491 - - - - - - - - - - - - - - - - - 1 Who should read this manual - - - - - - - - - - - - - - - - - 1 Scope of this manual - - - - - - - - - - - - - - - - - - - - - 1 Installation considerations - - - - - - - - - - - - - -
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SECTION ONE — Introduction Welcome to 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 • the Northstar 491 echo sounder sensor 491 • 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-
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SECTION ONE — Introduction • connecting the 491 to a transducer (see also the Transducer Connec- tor Instructions—GM492) • troubleshooting and testing the system • technical specifications for the 491 For information about obtaining technical support and returning the 491 for factory service, “SECTION FOUR — Troubleshooting and servicing the 491” beginning on page 21. For details about operating the 491, see the Northstar 491 Echo Sounder Operations Manual
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SECTION TWO — Installing the transducer Safety considerations WARNING! Be sure to turn the power off before starting the installation. Further, it is highly recommended that you keep power off while you’re performing the installation. If power is left on or turned on during the installation, fire, electrical shock, or other seri- ous injury may occur. Be sure to ground the equipment to prevent electri- cal shock and mutual interference. Be sure the transducer outputs are tied to
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SECTION TWO — Installing the transducer Selecting a Northstar recommends using an Airmar transducer with the Northstar 491 echo sounder. The Airmar B260, B744 and P66 can be obtained from transducer Northstar as an installation kit with connectors installed. Table 1: Northstar-recommended transducers Manufacturer Housing Power Frequency Northstar P/N Airmar B260 1 kW 50/200 kHz TD1004 Airmar B744V/B44V (with 600 W 50/200 kHz TD1005 3-wire speed) Airmar P66 600 W 50/200 kHz TD1006 A
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SECTION TWO — Installing the transducer Installation The following basic setup information isn’t a substitute for the installa- tion instructions provided by the transducer’s manufacturer. To ensure considerations that you meet all critical installation parameters, be sure to read and fol- low all of the requirements in their instructions. Northstar assumes no responsibility for improper installation. Choosing a mounting Do not mount the transducer: CAUTION! location behind stra
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SECTION TWO — Installing the transducer • the path for running the transducer’s cable is reasonably direct—keep in mind that the transducer cable is 33 feet long (10 meters). To pre- vent damage, coil any excess cable and secure it • water turbulence and noise are minimal, decreasing the amount of bubbles passing over the transducer face • the transducer isn’t behind hull irregularities or near eroding paint; both indicate areas subject to turbulence • the transducer is as far as possible fro
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SECTION TWO — Installing the transducer pressure waves 1/3 aft LWL 150-300mm (Load Waterline Length) (6-12") displacement hull outboard and I/O planning hulls inboard step-hull fin keel sailboat full keel sailboat Best location for the transducer FIGURE 1: Recommended installation locations for a transducer Installing the A flat-bottom hull provides the best environment for mounting the trans- ducer: It provides a horizontal surface and a constant water flow over the transducer transducer, with
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SECTION TWO — Installing the transducer 3˚ incline angle 1/3 aft LWL (Load Waterline Length) FIGURE 2: Recommended transducer incline angle backing block slope of hull deadrise angle hull parallel to waterline fairing fairing thickness at narrowest point multisensor 6–12mm (1/4–1/2") Deadrise angle and fairing thickness (B44V shown) FIGURE 3: Typical finished thru-hull installation with a fairing block (Airmar B744V) Maintaining Do not expose the transducer’s face or plastic housing to gasol
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SECTION TWO — Installing the transducer housing paddle wheel insert Paint exposed housing and bore up 30mm (1-1/4") detail lower O-ring Paint outside wall below the lower O-ring including exposed end, paddle wheel cavity and paddle wheel Anti-fouling paint (B744V shown) FIGURE 4: Anti-fouling paint areas (for Airmar B744V) Use special transducer paint. Other paints may CAUTION! contain copper, which is conductive and can burn out the transducer within minutes! To clean the transducer of heav
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SECTION TWO — Installing the transducer PAGE 10 491 INSTALLATION MANUAL Revision A
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SECTION THREE — Installing the 491 Safety considerations Be sure to turn the power off before starting the installation. WARNING! Further, it is highly recommended that you keep the power off while you’re performing the installation. If power is left on or turned on during the installation, then fire, electrical shock, or other serious injury may occur. Be sure to ground the equipment to prevent electrical shock and mutual interference. Be sure that the voltage of the power supply is betwee
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SECTION THREE — Installing the 491 PAGE 12 491 INSTALLATION MANUAL Revision A
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SECTION THREE — Installing the 491 System Figure 5 on page 13 shows a configured 961/962 echo sounder system, and Figure 6 on page 13 shows a configured 957/958/6000i echo sounder components system. GPS Antenna Northstar 961/962 display 10-foot data cable (Northstar-supplied) Northstar Northstar 491 961/962 Echosounder Processor 33-foot cable 10-foot power cable (Part of transducer) (Northstar-supplied) Shipʼs Transducer Power Figure 5: Echo sounder system components with the Northstar 961/962
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SECTION THREE — Installing the 491 Choosing a Before any drilling or cutting takes place, carefully choose a mounting location for the 491 module that meets the following criteria: mounting • where the transducer cable is kept securely away from other wires location • where the path for running the required electrical cabling is reason- ably direct; keep in mind the different cable lengths • where the 491 won’t be exposed to water • where the status indicator (on the front of the 491) can be o
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SECTION THREE — Installing the 491 Wiring the 491 Make sure that fuse or circuit-breaker protection is CAUTION! provided at the power source. The majority of installation problems are caused by shortcuts taken with system cables. When installing the 491, be sure that you: • assemble connectors carefully • don’t make sharp bends in the cables • leave service and drip loops, so that moisture won’t run down the cables and into the 491 or the navigator • tie-wrap all cables to keep them secure •
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SECTION THREE — Installing the 491 961/962 P1 Connector Plug 18 (Wiring Side View) 17 16 Green 15 14 Orange 13 White 12 Violet Data Cable Brown 11 Black 10 Blue 9 Red (not connected) 8 7 6 5 4 3 2 1 FIGURE 8: Interface cable connection from 961/962 to 491 Table 4: Cable connection between the 961/962 and 491 961/962 pin number 961/962 P1 signal name Cable wire color 9 Port 3 In (A) Blue 10 Port 3 In (B) Black 11 Ground Brown 12* Port 3 Out (A) Violet 12* Port 3 Out (A) White 13 Port 3 O
