COLOR SCANNING SONAR - Radar,Sonar · PDF filetransducer is to be operated in ambient temperature below 0 °C, the sonar compartment must be provided with a heater to keep the temperature

COLOR SCANNING SONAR

MODEL CSH-7

F I R S T E D I T I O N : M A Y 1 9 9 7 D : N O V . 5 , 1 9 9 8

Y o u r L o c a l A g e n t / D e a l e rFURUNO E L E C T R I C C O., L TD.c

9 - 5 2 , A s h i h a r a - c h o ,N i s h i n o m i y a , J a p a n 6 6 2

T e l e p h o n e : 0 7 9 8 - 6 5 - 2 1 1 1T e l e f a x : 0 7 9 8 - 6 5 - 4 2 0 0

A l l r i g h t s r e s e r v e d . Printed in Japan

P U B . N o . I M E - 1 3 0 2 0 - DC S H - 7( T A T A )

iiiiiiiiiiiiii

SAFETY INSTRUCTIONS

Do not work inside theequipment unless totallyfamiliar with electricalcircuits.

Hazardous voltage which canshock exists inside the equip-ment.

Turn off the power at the mains switchboard before beginning the installation.Post a sign near the switch to indicate it should not beturned on while the equip-ment is being installed.

Fire or electrical shock canresult if the power is left on or is applied while the equip-ment is being installed.

WARNING

Install the display unit and transceiverunit where they will not be exposed towater splash or rain.

Fire or electrical shock can result if waterleaks inside those units.

Ensure no water leaks through themounting location for the transducer.

The ship may sink if water leaks through themounting location. Check the location care-fully at installation.

The retraction tank should be con-structed of the specified material andinstalled in accordance with the pro-cedures set forth in this manual. Use ofother material or procedure is theresponsibility of the shipyard. In anycase the tank should be installed so the hull will not be seriously damaged in the event the tank is struck by an object.

CAUTION

Use the proper fuse.

Use of a wrong fuse can result in fire orpermanent equipment damage.

Replace zinc block near the transduceryearly.

If not replaced corrosion between trans-ducer and main shaft may result.

Do not exceed speed noted in the speci-fications when operating the equipmentor lowering or raising the transducer.

The transducer may become damaged.

Ground the equipment toprevent mutual interference.

POSSIBILITY OF INJURY

1. If breaker (hull unit) trips do the following:

1) Turn off power swich on hull unit. 2) Wait 60 sec after breaker has tripped. 3) Press breaker.

2. Turn off hull unit before using hand crank.

WARNINGPOSSIBILITY OF WATER LEAKAGE

To prevent loss of main shaft of the hull unit and water leakage tighten bolts fixing shaft retainer for torque of 2000-2500 N• cm and tighten fastening band for torque 600-800 N• cm.

ii

iii

TABLE OF CONTENTS

SYSTEM CONFIGURATION .................................................................................. iii

MOUNTING1.1 General Mounting and Handling Considerations ............................................................1-11.2 Mounting the Hull Unit ...................................................................................................1-21.3 Mounting the Transceiver Unit ...................................................................................... 1-111.4 Mounting the Display Unit ............................................................................................1-111.5 Grounding the Display Unit and Transceiver Unit ........................................................1-12

WIRING2.1 Wiring Diagram ...............................................................................................................2-12.2 Wiring the Hull Unit ........................................................................................................2-22.3 Wiring the Transceiver Unit.............................................................................................2-32.4 Wiring the Display Unit ...................................................................................................2-42.5 Synchronizing Transmission with Other Equipment .......................................................2-52.6 How to Unplug the XH Connector ..................................................................................2-7

CHECKS AND ADJUSTMENTS3.1 General Checks ................................................................................................................3-13.2 Heading Alignment ..........................................................................................................3-33.3 Sea Trial ...........................................................................................................................3-4

INSTALLATION OF INTERFACE MODULE CSH-7050 (option)4.1 Introduction .....................................................................................................................4-14.2 Installation .......................................................................................................................4-2

ASSEMBLING TRANSCEIVER FRAME (Option) .................................... 5-1

DRAWINGSEquipment Lists ....................................................................................................................A-1Outline Drawings ..................................................................................................................D-1Interconnection Diagram ...................................................................................................... S-1Schematic Diagram............................................................................................................... S-2

iv

SYSTEM CONFIGURATION

v

Equipment Lists

Standard Supply

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Optional Equipment

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3 reifitceR 4243-UR 1 —

4 knaTnoitcarteR 5-01PO tes1 367-960-000 dnaknatmunimulAteksagnoitalusni

5 revoCtsuD 1042-340-41 1 030-561-001

6 dooH 02130-30PF 1 011-932-800 tinuyalpsidrof

1-1

MOUNTING

1.1 General Mounting and Handling Considerations

• Be sure the power supply matches equipment voltage rating. Improper power supply willdamage the equipment.

• Locate the transducer where the affects of noise and air bubbles are minimal. Noise and airbubbles will affect performance.

• When selecting a mounting location keep the following points in mind:

• Keep equipment out of direct sunlight.• Keep equipment away from air conditioner.• The useable temperature range of the display unit is 0°–50°C.• Provide sufficient ventilation.• Select location where vibration is minimal.• Locate the equipment away from magnets and magnetic materials.

• Keep the transducer away from oil. Oil can corrode the cable.

• Do not expose the transducer to hot water. Hot water can damage the transducer.

• Do not turn on the equipment with the transducer exposed to air. Exposing the transducer toair may damage it.

• Magnetic compass performance will be affected if it is placed too close the display unit.Observe the compass safe distances shown below to prevent deviation of a magnetic com-pass.

Standard compass: 1.3 mSteering compass: 1.0 m

1-2

1.2 Mounting the Hull Unit

Location

Discussion and agreement are required with the dockyard and ship owner in deciding the loca-tion for the hull unit. When deciding the location, take into account the following points:

• Select an area where propeller noise, cruising noise, bubbles and interference from turbu-lence are minimal. Generally, the point at 1/3 to 1/2 of the ship’s length from the bow or nearthe keel is the best. On-the-keel installation is advantageous for minimizing oil consumptionin comparison with off-the-keel. If the hull unit cannot be installed on the keel, the center ofthe retraction tank should be within 1 meter of the keep to prevent a rolling effect.

1/2 1/3 Within 1 m

Figure 1-1 Installation location for hull unit

• Select a place where interference from the transducers of other sounding equipment is mini-mal. The hull unit should be at least 2.5 meters away from the transducers of other soundingequipment.

• An obstacle in the fore direction not only causes a shadow zone but also aerated water,resulting in poor sonar performance. Be sure to locate the transducer well away from anyobstacle in the fore direction.

• The following space is required around the hull unit for wiring and maintenance. If thetransducer is to be operated in ambient temperature below 0°C, the sonar compartment mustbe provided with a heater to keep the temperature above 0°C.

BOWDirection

400800

400

800

45°

If the space shown is not available,leave at least 50 cm in foredirection.

Figure 1-2 Hull unit maintenance space

1-3

Installation of the retraction tank

The retraction tank is 1000 mm in length as supplied. Shorten the tank referring to the tablebelow so the transducer fully protrudes beyond the keel when it is lowered. Refer to pages D-1to D-6 for details.

Figure 1-3 How to shorten the retraction tank

Reletion of tank length and shft length

Shaft supplied 945 1300 1550 2350

Shaft/Cut lengthShaftlength

Cutlength

Shaftlength

Cutlength

Shaftlength

Cutlength

Shaftlength

Cutlength

Hull Unit Tanklength

400Stroke 550 945 0

600Stroke

750 1300 0

800 1365 185

850 1415 135

900 1465 85

950 1515 35

1000 1550 0

1100 1665 685

1200 1765 585

1300 1865 485

1400 1965 385

1500 2065 285

1600 2165 185

1700 2265 85

1800 2350 0

1-4

Assembly and installation of the hull unit

The hull unit is shipped disassembled as the parts shown on pages 1-8 and 1-9. Assemble thehull unit as follows:

Necessary tools

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1. Fasten the raise/lower drive assembly to the main body flange with the trunnion shaft.

Split pinTrunnionshaft

Main bodyflange

Raise/lowerdrive assy.

Flat washer

Flat washer

Figure 1-4 How to fasten raise/lower drive assy. to main body flange

2. Coat the top of the main shaft with a small amount of grease. Pass the main shaft through themain body flange, and fix it temporarily with the shaft retainer. (The shaft retainer should besecure enough to prevent shaft rotation.)

Main shaft


Wipe off greasebefore tighteningshaft retainer.

Main shaft shouldprotrude by 15 mm fromtop of shaft retainer.

Grease threads.

M10M10 Spring washer M 10 x 35

15 mm

Figure 1-5 Passing main shaft through the raise/lower drive assy.

1-5

3. Remove sheath of transducer cable by the length shown below. Tape the end of the sheathwith vinyl tape.

Raise/lower shaft length is 1550 mm or more (for 600 stroke): Removal not necessary.Raise/lower shaft length is 1300 mm: Remove by 250 mm.Raise/lower shaft length is 945 mm: Remove by 650 mm.

Use suitable rollerknife to cut sheath.

Figure 1-6 Removing sheath with roller knife

4. Fasten the main shaft to the transducer.

Coat 50 mm ofshaft with grease.

Rotate trans-ducer to screwin main shaft.

Hold here with pipewrench.

Socket set screwM5 x 10, 2 pcs.

If it is difficult to pass the transducercables through the flat washers ofthe cable gland, unbind the transducercables and pass them one by one.

Flat washer

Note: Screw shaft 50 mminto transducer flange.

50 mm 140 mm

Figure 1-7 Fastening main shaft to transducer

5. Inscribe bow mark on the top end of the main shaft and install fastening band and cablegland.

BOW mark BOW mark

Shaftretainer

Inscribe line refer-ring to bow markon transducer.

Fastening band *

Gasket

Cable gland

Flat Washer

Tighten cablegland for gapof 3 mm.

Fastening band

Cablegland

15 mm

3 mm

* Tighten fastening band for torque of 600–800 N• cm.

Figure 1-8 Inscribing bow mark,installing fastening band andcable gland

1-6

6. Set grease cotton to main body flange and tighten the grease cotton retainer.

Wind grease cottononto main shaft andcut as below.

Space joints of cotton at 120° and push intomain body flange.

Tighten greasecotton retainer forgap of 7 to 9 mm.

Flat washer

Figure 1-9 Setting grease cotton

7. Attach the tank guide. The distance between the top of the transducer flange and the bottomof the tank guide body should be 340 mm for 600 m travel type and 140 mm for 400 mmtravel type.

Bow markTank guide

Align with bowmark on trans-ducer flange.

340 mm (for 600 mm travel type)140 mm (for 400 mm travel type)

M10 x 55

M10 SW*

* Spring washer

Figure 1-10 Installing the tank guide

8. Attach zinc block to main shaft..

CAUTIONThe zinc block near the transducer mustbe replaced yearly.

The junction between the transducer andmain shaft may corrode, which can resultin loss of the transducer or water leakageinside the ship.

Ship's bowTank guide

Zinc block

Orient round endto tank guide side.

Attach zinc blockas close as possibleto tank guide.

Figure 1-11 Attaching zinc block

1-7

9. Fasten the hull unit to the retraction tank. Orient it so the ship’s fore-aft line crosses the frontpanel of the raise/lower drive assy. at an angle of approximately 45°.

Raise/lowerdrive assy

M20 Flat washer

Gasket

M20 Flat washer

M20 x 80

Orient the hull unit as shown.This will reduce shock andvibration, caused by ship'spitching and rolling, at theraise/lower drive assy.

BOW

M20 Nut

M20 Spring washer

Figure 1-12 Fastening the hull unit to the retraction tank

10.Fix anti-vibration stays to the retraction tank.

Anti-vibrationstay

Figure 1-13 Fixing anti-vibration stays to retraction tank

11.Orient the main shaft so that the bow mark faces ship’s bow and fix it securely with the shaftretainer.

Loosen shaft retainerand rotate main shaftso the bow mark onit faces ship's bow.

Bow mark

Ship's bow

Figure 1-14 Orienting the main shaft



1-8

1-9

1-10

How to use the hand crank

CAUTIONPOSSIBILITY OF INJURY

1. If breaker (hull unit) trips do the following:

1) Turn off power swich on hull unit. 2) Wait 60 sec after breaker has tripped. 3) Press breaker.

2. Turn off hull unit before using hand crank.

1. Turn off the POWER switch on the hull unit.

2. Remove the gear cover on the hull unit.

Gear cover

POWER switch

M4 x 8,4 pcs.

Screw shaftgear

Motorgear

OFF[ON

Figure 1-15 Hull unit

3. Attach the hand crank onto the screw shaft gear or motor gear depending on circumstance.

a) When crank is attached to shaft gear (Requires greater force but less turns.)

Hand crank

Shaft gear

Tighten screw.(Use screw fromcover.)

Shaft moves 600 mmper 120 turns of crank.

Motor gear

Tighten screws.(Use screw fromcover.)

Shaft moves 600 mmper 210 turns of crank.

b) When crank is attached to motor gear (Requires less force but more turns.)

Figure 1-16 Attaching the hand crank

1-11

1.3 Mounting the Transceiver Unit

• The transceiver unit generates heat so the mounting location should be well ventilated anddry.

• The unit is only designed for wall mounting. The unit weighs 14 kg so reinforce the mount-ing location if necessary.

• Secure the maintenance space shown in the figure below for ease of maintenance and ser-vice.

340

(645

)#1

00

645

#100

4-∅10

1362

0±1

210±1

2748

(570

)

Fixing hole

Figure 1-17 Transceiver unit mounting dimensions

Note: The transceiver unit can be mounted on the hull unit with Transceiver Frame Kit (op-tion). See page 5-1 for details.

1.4 Mounting the Display Unit

Select the mounting location considering the following condi-tions:

• Select a location where the display unit can be easily oper-ated while observing the fishing ground or area surroundingthe vessel.

• Locate the unit at least 1 meter away from a magneticcompass and equipment which contains magnets (radarmagnetron, loudspeaker, high power transformer).

• Select a location not exposed to direct sunlight, water splash or hot air.

• Select a location which accommodates the viewing angle shown below.

Cap

CRT

45°45°

Figure 1-18 Display unitviewing angle

1-12

1.5 Grounding the Display Unit and Transceiver Unit

Ground the equipment with a copper plate.

Ground the equipment toprevent mutual interference.

CAUTION

SCREEN FOCUS

Earthterminal

DISPLAY UNIT

Earthterminal

TRANSCEIVER UNIT

Figure 1-19 Location of earth terminals on display unit and transceiver unit

2-1

WIRING

2.1 Wiring Diagram

3 5 2 4 61

- +

SCREEN FOCUS

*1

Power connector

Earth terminalFuse

Pre-connected

VV-S 0.5x10C3 m

10S1915, 6.6 m

10S1903,5 m10S1904,10 m10S1905,15 m10S1925,30 m

250V-DPYCY-3.5

or equivalent

250V-DPYCY-1.25or equivalent

Ship’s mains24 VDC

TRANSCEIVERUNIT

DISPLAY UNIT

*1

*1 Fabricate cable in field.

For shaft length of 1300 or 945 mm,remove outer sheath until point a below.

a

��

�

DPYCY-1.25

Armar

Vinyl sheathConductorS=1.25 mm2

φ =1.35 mm

��

DPYCY-3.5Armar

Vinyl sheathConductorS=3.5 mm2

φ =2.4 mm

Figure 2-1 Wiring diagram

2-2

2.2 Wiring the Hull Unit

Transducer cables should not be stretched unduly during raising or lowering operation.

1. Fix six cables from raise/lower assy. with cable clamp Å.

Cable clamp Å


Cable calmp ı


2. Run the six cables to cable clamp ı on the raise/lower assy. and position them as shownbelow. Temporarily tighten clamp ı.

a b c d e f

a

b

c

de

f

Cable clamp ı

Cableclamp Å

Example: Wire a of clamp Åto a of clamp ı.

Figure 2-3 Cable clamps and positioning of cables

3. Adjust the cable lengths between cable clamps a and b as follows:

Cable length between a of Å and a of ı:600 stroke: 660 mm400 stroke: 580 mm

4. Adjust slack of five other cables so it is the same as the ones adjusted at step 3. Tighten thecable clamp ı.

2-3

2.3 Wiring the Transceiver Unit

Except the power cable, all cables connected to the transceiver unit are factory-fitted connec-tors.

Number affixed to cablesheath. (Match numberwith terminal number.)

24 VDCShip's mains

KP signal I/O (video sounder, etc.)Cable from hull unit

Cable from display unit

CN-B2J6

CN-B1J5

CN-B4J7 J9 J3 J4

J1

J3

J2

P1

P3

P2

1 3 5 2 4 6Number inscribedon sheath. Connectwire according tonumber.

Cable clamp

Cable clamp

Ground at thinmetallic bandof cable.

Fasten wirehere.

Transducer cable

40 5

Vinyl sheath Armor

WhiteBlack

TB-B1

CN-B3- +

How to fabricate power cable

100

TB-B1

+-

Figure 2-4 Wiring in transceiver unit

2-4

2.4 Wiring the Display Unit

SCREEN FOCUS

Power cable

From transceiver

Remote controller(option)

Figure 2-5 Display unit, rear view

How to fabricate the power cable

#1 pin(+)#2 pin(+)

#3 pin(+)

Figure 2-6 How to fabricate the power cable

2-5

2.5 Synchronizing Transmission with Other Equipment

When two CSH-7s are installed connect them as shown below. This will synchronize the trans-mission of the #2 sonar with that of the #1 sonar.

Synchronizing with another CSH-7

1) Wiring

#2 Sonar #2 Sonar

TRANSCEIVER UNIT TRANSCEIVER UNIT

DIG Board DIG BoardJ7 J75

6

1

2

INT-KPC-H

INT-KPC-C

EXT-KPC-H

EXT-KPC-C

Figure 2-7 Connection of two sonars

2) DIP switch setting

Set DIP switches on the DIG board as follows:

hctiwsPID ranoS1# ranoS2#

3#-1S — NO

4#-1S NO —

3) Menu setting

On Menu-2, set external KP ON for the #2 sonar. Refer to the operator’s manual for menusetting procedure.

2-6

Synchronizing with echo sounder or other sonar

To synchronize the transmission of the CSH-7 with an echo sounder or other type of sonar,make the connections as shown below.

1) Wiring

TRANSCEIVER UNIT

DIG Board J77

8

EXT KPV

GND

ES

SONAR

This equipment acceptsKP input of 5 to 15 V.

TRANSCEIVER UNIT

5

6

EXT KPC-H

EXT KPC-C

ES

SONAR

For current loop signal

For voltage signal

DIG Board J7

Figure 2-8 Connect of CSH-7 with echo sounder or sonar

2-7

2) DIP switch setting

Set DIP switch S1 #3 on the DIG board as follows:

Transmit external ES/sonar at rising edge of KP signal: ONTransmit external ES/sonar at leading edge of KP signal: OFF

3) Menu setting

On Menu-2, set external KP ON. Refer to the operator’s manual for menu setting procedure.

Reference: Outputting KP of CSH-7 to external equipment

TRANSCEIVER UNIT

DIG Board J73

4

INT KPV

GND

ES

SONAR

For voltage signal

TRANSCEIVER UNIT

DIG Board J71

2

INT KPC-H

INT KPC-C

ES

SONAR

For current loop signal

Figure 2-9 How to output CSH-7’s KP to external equipment

2.6 How to Unplug the XH Connector

Use XH connector remove the unplug the XH connector.

Connectorremover

XH connector

Figure 2-10 How to use the XH connector remover

3-1

CHECKS AND ADJUSTMENTS

3.1 General Checks

Check on slipway or in drydock

No.

1

2

3

4

Check item

Retraction tank

Clearance between trans-ducer and bottom of re-traction tank when trans-ducer is completelyretracted by hand crank.

Transducer travel(lowered by hand crank)

Note: Clearance underbootom of the transducershould be approx. 1 meterin order to check.

Transducer heading

1-2

1-2

D-8

D-7

1-6

On-keel installation

Off-keel installation

Bow mark inscribed on main shaft shouldface ship's bow.

Flush with keel

Within 1 m

Approx. 1 cm

Min. 30 cm

BOWmark

ResultRef. pageRating

3-2

Do not open the equipmentunless totally familiar withelectrical circuits.

Hazardous voltage which cancause electrical shock existsinside the equipment.

WARNING

General equipment checks

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3-3

3.2 Heading Alignment

1. Locate a target (buoy, etc.) in the bow direction and display it on the screen at a close range.The heading alignment is correct when the target is displayed at 12 o’clock on the screen.

When the target on the screen isskewed to the right, the transducerheading is skewed to the left.

Buoy

Figure 3-1 Locating a target to use for aligning heading

2. If the heading alignment is incorrect, unscrew the two bolts fixing the main shaft and rotatethe main shaft.

Shaft retainer

Loosen two bolts.


3. Fasten two bolts unscrewed in step 2.

Note 1: Heading can be aligned through the menu if the error is small. When the error is large,rotate the shaft to correct it; the tank guide should be oriented to ship’s fore-aft direction toreduced shock at the main shift when the ship pitches.

Note 2: See the operator’s manual for how to align heading through the menu.



3-4

3.3 Sea Trial

Cruising noise check

Check and record the cruising noise level displayed on the screen with the transmitter turnedoff and also the ship’s speed at which the sonar is to be used.

NL

RANGE

GAIN

TVG

TILT

DEPTH

800 m

5.0

N ∞ F ∞

0°

ENG RPM

SPEED

SEA CONDITION

0 KTS

Ship anchored

NL

RANGE

GAIN

TVG

TILT

DEPTH

800 m

5.0

N ∞ F ∞

0°

ENG RPM

SPEED

SEA CONDITION

Ship at cruising speed

Recording optimum control settings

Record optimum control and switch settings and take a photograph of the sonar picture asreference for later service.

RANGE

TILT

TVG

GAIN

OUTPUT

TX PULSELENGTH

NOISE LIMITER

AGC

VP

INTERFERENCE REJ

N F

|PHOTOGRAPH |

4-1

INSTALLATION OF INTERFACEMODULE CSH-7050 (option)

4.1 Introduction

The Interface Module CSH-7050 is required to connect the CSH-7 to eexternal equipment suchas a navigator, echo sounder, and it is usually installed in the display unit at the factory. Toinstall it in the field, follow the instructions below. For interconnection, see the interconnectiondiagram on page S-1.

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4-2

4.2 Installation

1. Remove the display unit cover.

2. At the left side of the display unit, unfasten thesix screws fixing the MAIN Board (10P6835).

3. Fix the ITF Board to the MAIN Board with sixsets of spacers and spring washers (supplied) andscrews removed at step 2.

4. Connect cable assy. (supplied) between J9 on theMAIN Board and J1 on the ITF Board (10P6840).

5. Remove dummy plate at rear of display unit andinstall the connector board assy. there.

6. Connect the cables from the connector board assy.to the ITF Board as follows:

Connector board assy. ITF Board NAV CI GYRO LOG

CN-4A J3CN-5A J4CN-6A J6CN-7A

7. Reattach the cover.

MAIN Board10P6835

J9

J1

PMAINJ9

J4

J2 J1

J6

J3J4

P ITF

J3

Cable Assy.

10S1901

Connector Board Assy.

ITF Board

Cable assy.

Figure 4-1 Display unit, right side view

5-1

ASSEMBLING TRANSCEIVER FRAME(option)

The transceiver unit can be mounted on the hull unit with Transceiver Frame Kit.

Transceiver Frame Kit OP10-14 (Code number:006-630-640)

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2 2emarF 2503-160-01 058-052-001 1

3 teksaG 3503-160-01 063-352-001 2

4 tloB.xeH 403SUS02x8M 177-868-000 7

5 rehsaWtalF 403SUS8M 031-468-000 7

6 rehsaWgnirpS 403SUS8M 262-468-000 7

Procedure

1. After mounting the hull unit, fasten frame 1 to the flange with three hex. bolts (M20x80)used at tank flange.

2. Similairy, fasten frame 2 to the flange with three hex. bolts (M20x80).

3. Fasten frame 1 and frame 2 with three sets of hex. bolt (M8x20), flat washer and springwasher.

4. Set the two gaskets to the rear panel of the transceiver unit.

5. Mount the transceiver unit to frames 1 and 2 with four sets of hex. bolts (M8x20), flatwashers and spring washers.

6. If necessary, attach reinforcement ribs (local supply).

5-2

Hull unit

M20 Nut

Transceiver unit

M8x20 Frame 1

M20x80(Fasten with flange.)

M8x20

Frame 2

Gasket for anti-vibration(Stick to Transceiver unit.)

Reinforcementrib

Reinforcement rib

Figure 5-1 Assembling of Transceiver Frame Kit

Documents

COLOR SCANNING SONAR - Radar,Sonar · PDF filetransducer is to be operated in ambient temperature below 0 °C, the sonar compartment must be provided with a heater to keep the temperature