JLN-205 Speedlog Instruction Manual

7/23/2019 JLN-205 Speedlog Instruction Manual

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General Information i

General Information

Thank you for purchasing the Japan Radio Co., Ltd. JLN-205 Doppler Log. The JLN-205 conforms to

the IMO (International Maritime Organization) performance standards, provides accurate displays of

ship’s speed over a wide range from dead slow to maximum.

• Before attempting to operate this equipment, read this instruction manual thoroughly to ensure correct

and safe operation in accordance with the warning instructions and operation procedures.

• You are strongly recommended to store this instruction manual carefully for future reference.

In the event that you have an operational problem or malfunction, this manual will provide useful

instructions.



ii General Information



Before You Begin iii

Before You Begin

Symbols Used In This ManualIn this manual, and on the equipment, we use several warning signs to call your attention to

important items that, if not handled correctly, could present danger to yourself or property. Thesewarning note classifications are as described below.

Please be fully aware of the importance of these items before using this manual.

Indicates warning items that, if ignored, may

result in serious personal injury or even death.

Indicates cautionary items that, if ignored,

may result in personal injury or physical

damage.

Examples of Related Symbol Marks Used in this Manual and on the

Unit

Each mark is intended to alert the user to the presence of precautions

including danger and warning items. The picture in each mark (“Electric

shock” in the example on the left.) alerts you to operations that should be

carefully performed.

Each mark is intended to alert the user to the presence of prohibited activity.

The picture/word in/beside each mark (“Disassembling Prohibited” in the

example on the left.) alerts you to operations that are prohibited.

Each mark is intended to alert the user to the presence of necessary

instructions. The picture in each mark (“Disconnect the power plug” in the

example on the left.) alerts you to operations that must be performed.

WARNING LABELYou can see the warning label on the top of the unit.

Do not attempt to remove the warning label from the unit or impair or modify it.



iv Usage Hints

Usage Hints

Do not remove the cover of this unit. Otherwise, you may touch ahigh-voltage part and suffer from an electrical shock.

Turn off the power on/off switch, and turn off the power supply breaker when you do the maintenance check of this unit. Otherwise, afire, an electrical shock, or a failure may occur.

Do not disassemble or modify this unit. Otherwise, a fire, an electricalshock, or a failure may occur.

Do not place a vessel containing water, etc. or a metallic object on thisunit. When water spills or when water or the object enters the unit, afire, an electrical shock, or a failure may occur.

Do not use this unit at a voltage other than the supply voltage stated onthe unit. Otherwise, a fire, an electrical shock, or a failure may occur.

Do not insert or remove the power cord or operate switches with a wethand. Otherwise, you may suffer from an electrical shock.

Do not damage or modify the power cord. Placing a heavy objectonto, heating, stretching or bending the cord may cause a fire orelectrical shock.

Do not any maintenance on the transducer while the ship is in thewater. Doing so may cause injury or water leakage to the ship.

Do not check or repair in this unit. Please call our field representativeor your nearest JRC office for inspection and repair services. It causes

it of a fire or electrical shock.

In the event that you spill or drop any liquids or metals etc., turn offthe unit, turn off the power supply breaker, and contact your salesagent outlet or one of JRC branch offices, sales centers or liaisonoffices. Continuing operation as is may cause a fire, electric shock ormalfunction.

In the event that smoking or burning odors are detected, immediatelyterminate operation of the unit and contact your sales agent outlet orone of JRC branch offices, sales centers or liaison offices. Continuingoperation as is may cause a fire or electrical shock. Never attempt to

service the interior of the unit.



Usage Hints v

Contact our service center or agent for any electrical work orinstallation of this unit. With the exception of qualified service personnel, do not attempt to service this unit, as doing so may cause

malfunction.

Do not install this unit is exposed to direct sunlight for a long time or

the place where hot wind is hit or the temperature rises above 55°C.Doing so may cause a fire or a breakdown.

Do not place the unit on a wobbly stand or any unsteady foundation.Doing so may cause the unit to fall resulting in injury or damage.

Do not put this unit in the cabinet, and do not cover with the cardboardetc. Heat shuts oneself up, and doing so may cause a fire or a breakdown.

Do not bring the unit in a cooled state abruptly into a warm room. Ahigh voltage may leak due to condensation may result in failure. Inthis case, use the unit set after leaving it alone for 30 min.

When installing this set, be sure to connect the grounding wire or thegrounding plate to the grounding terminal of the unit. Otherwise, youmay suffer an electrical shock during a failure or leak.

Do not turn on the power switch of the unit while the ship is on theshore. Otherwise, the transducer may malfunction.

Reasonable care must be exercised for the routing of the transducercable, power cable, signal cable and grounding cable. Otherwise, theunit may adversely effect other equipment or vice versa.

Do not use an organic solvent such as thinner or benzine when youclean the surface of the unit. For cleaning the surface, remove the dust

and refuse and wipe with clean dry cloth. Otherwise, the painting onthe surface may be damaged.



vi Usage Hints



External View vii

External View



Contents

General information ...................................................................................................................................... i

Before You begin .......................................................................................................................................... iii

Usage Hints .................................................................................................................................................. iv

External View .............................................................................................................................................vii

1. Introduction .......................................................................................................................................... 1

1.1 Function ....................................................................................................................................... 1

1.2 Features ........................................................................................................................................ 2

1.3 Components ................................................................................................................................. 3

1.4 Construction ................................................................................................................................ 41.5 System Configuration .................................................................................................................. 9

2. Names and Functions of the Components ........................................................................................ 10

3. Installation .......................................................................................................................................... 11

3.1 Installing the Main Display Unit ...............................................................................................12

3.2 Installing the Signal Distributor Unit ........................................................................................13

3.3 Installing the Signal Processor Unit .......................................................................................... 13

3.4 Mounting the Transducer ........................................................................................................... 13

3.5 Connection Diagram................................................................................................................... 14

4. Operation ............................................................................................................................................. 15

4.1 Overview ................................................................................................................................... 16

4.2 Turning the unit ON/OFF .......................................................................................................... 17

4.3 Initial screen / Self test ..............................................................................................................17

4.4 Normal screen ............................................................................................................................ 17

4.5 Adjusting Contrast and Back Lighting ......................................................................................19

4.6 Trip Distance Reset ................................................................................................................... 19

4.7 Vessel Speed Unit ...................................................................................................................... 20

4.8 Menu Setting ............................................................................................................................. 20

4.9 Warning message ....................................................................................................................... 23

5. Detail Setting ....................................................................................................................................... 24

5.1 Initial operation of Detail Setting .............................................................................................. 24

5.2 Detail Setting ............................................................................................................................. 24

6. Maintenance......................................................................................................................................... 26

6.1 Daily maintenance...................................................................................................................... 27

6.2 Troubleshooting for Malfunctions or Abnormalities .................................................................. 27



7. Consider Installation........................................................................................................................... 28

8. After-Sales Service .............................................................................................................................. 29

8.1 When ordering a repair............................................................................................................... 29

8.2 Recommendation of overhaul..................................................................................................... 29

9. Disposal ................................................................................................................................................ 30

9.1 Disposal of the Equipment ......................................................................................................... 30

10. Specifications ....................................................................................................................................... 31

Appendix...................................................................................................................................................... 32

1. Remarks on Error resulting from deviation of radiation angle from the reference value ........... 322. Outline and Setting drawing ...................................................................................................... 34

3. Spare Parts List .......................................................................................................................... 40



1 1. Introduction

1. Introduction

1.1 Function

The JRC Model JLN-205 Doppler Log is an equipment for measuring accurately the true speedand run of a ship, utilizing the Doppler shift of ultrasonic signals, which are radiated from a

trnsducer into sea water downward obliquely to the bow and stern sides, then scattered and

reflected in the sea water. The transducer is mounted on the hull bottom.

This equipment measures a relative speed to seawater from the hull bottom within 3m. Therefore,

ship’s speed corresponding to the output of a main engine can be obtained without containing the

speed such as the currents. The ship’s speed error margin caused by the change in the water line

doesn't occur because the transmission and the reception of the pulse are done, and it excludes the

signal in the vicinity of the bottom of a ship. Moreover, because the dual beem method to launch

the ultrasonic wave signal in two directions (fore and aft) is adopted, the ship’s speed error margin because of the change in the trim is greatly reduced.

This equipment offers measured information to other equipment such as radar and ECDIS.

Figure 1.1 Doppler Log



1. Introduction 2

1.2 FeaturesJLN-205 Doppler Log has the following features:

1) Ship’s Speed Through the Water

Using a high-accuracy pulse Doppler system and high-frequency ultrasonic signals,

signals reflected from approximately 2 to 3m underwater below the hull bottom aretracked to detect their Doppler frequency shifts, ensuring highly accurate

measurement of own ship’s speed through the water without being effected by

following waves.

2) Free of Errors Due to Hull Motions

An ultrasonic beam pair is transmitted aslant underwater in the fore and aft

directions. The error margin because of the hull motion like the rolling and the

pitching can be greatly removed by measuring the difference of both Doppler shift

reception signals. This equipment ensures high accuracy of speed measurement evenin roughest sea conditions.

3) Reliable Compact Transducer

The transducer unit is of molded rubber and has a compact and lightweight

construction, ensuring ease of installation. Moreover, the unit has been designed to

minimize the effects of aeration, ensuring stable, accurate operation. There is also no

troublesomeness of putting the detector into and out of water when the ship leaves

and enters the port.

4) Confirms to the following standards

IMO A.824(19), as amended by MSC.96(72), IMO A.694(17), IEC 61023:1999, IEC 60945:2002,

IEC 61162-1:2000



3 1. Introduction

1.3 ComponentsThe standard equipment and options are shown in the tables below.

Standard Equipment

Description Model No. QTY MASS IP Remarks

MAIN DISPLAY NWW-65A-65B

1 0.8kg IPX5 A: Desk Form typeB: Console mount type

Select one.

SIGNAL DISTRIBUTOR NQA-4288 1 6kg IPX2

SIGNAL PROCESSOR NJC-25 1 6kg IPX5

TRANSDUCER NKF-547 1 17kg IPX8 Flush mount typeWith cable 30m

SPAIR PARTS 7ZXBS0020 1 -- --

INSTRUCTION MANUAL 7ZPBS2803 1 -- --

Options

Description Model No. QTY MASS Remarks

SLAVE DISPLAY NWW-65S 2Max. 0.8kg

NWW-24 6.5kg Flush mount type

NWW-25 7kg Wall mount type

ANALOG DISPLAY

NWW-26

2Max.

2.5kg Panel mount type

NWW-5 1Max. 1.5kg Fore/Aft. Speed &. DirectionREMOTE DISPLAY

NWW-16 2.5kg Fore/Aft. Speed &. DirectionDistance

DISTANCE COUNTER NWW-7 1Max. 0.8kg Distance, 9999.99nm Max.

NCM-227D -- 0.5kg for Main/Slave Display

NCM-329 -- 0.5kg for Analog Display

DIMMER UNIT

NCM-227 -- 0.5kg for Remote Display

JUNCTION BOX NQD-2025 -- 0.5kg NWW-65/S---NQA-4288for extension

TRANSDUCER NKF-531E 1 48kg Gate Valve typeWith cable 25m



1. Introduction 4

1.4 Construction

Equipment Outline

The unit dimension is as follow:

(1) Main Display NWW-65A/B

Figure 1.2 NWW-65A OUT LINE (Disk Form type)

Figure 1.3 NWW-65B OUT LINE (Console mount type)

Unit: mm

Unit: mm



5 1. Introduction

(2) Signal Distributor NQA-4288

Figure 1.4 NQA-4288 OUT LINE

(3) Signal Processor NJC-25

Figure 1.5 NJC-25 OUT LINE

Unit: mm

Unit: mm



1. Introduction 6

(4) Transducer NKF-547

Figure 1.6 NKF-547 OUT LINE

(5) Transducer NKF-531E (Option)

Figure 1.7 NKF-531E OUT LINE

Unit: mm

Unit: mm



7 1. Introduction

(6) Analog Display (Option)

Figure 1.8 Analog Display OUT LINE

(7) Remote Display NWW-5 (Option)

Figure 1.9 NWW-5 OUT LINE

(8) Remote Display NWW-16 (Option)


NWW-24(Finish mount)

NWW-25(Wall mount)

NWW-26(Panel mount)

Area Size Green Orange Green Orange Green Orange

L NWW-24L20G

NWW-24L20O

NWW-25L20G

NWW-25L20O

NWW-26L20G

NWW-26L20O

M ―― ―― ―― ―― NWW-26M20G

NWW-26M20O

- 4 ∼ 2 0 k t

S NWW-24S20G

NWW-24S20O

NWW-25S20G

NWW-25S20O

NWW-26S20G

NWW-26S20O

L NWW-

24L25G

NWW-

24L25O

NWW-

25L25G

NWW-

25L25O

NWW-

26L25G

NWW-

26L25OM ―― ―― ―― ――

NWW-26M25G

NWW-26M25O

- 5 ∼ 2 5 k t

S NWW-24S25G

NWW-24S25O

NWW-25S25G

NWW-25S25O

NWW-26S25G

NWW-26S25O

L NWW-24L30G

NWW-24L30O

NWW-25L30G

NWW-25L30O

NWW-26L30G

NWW-26L30O

M ―― ―― ―― ―― NWW-26M30G

NWW-26M30O

- 6 ∼ 3 0 k t

S NWW-24S30G

NWW-24S30O

NWW-25S30G

NWW-25S30O

NWW-26S30G

NWW-26S30O

Unit: mm

Unit: mm

Unit: mm



1. Introduction 8

(9) Distance Counter NWW-7 (Option)


(10) Dimmer Unit NCM-227/329 (Option)

Figure 1.12 NCM-227/329 OUT LINE

(11) Junction Box NQD-2025 (Option)

Figure 1.13 NQD-2025 OUT LINE

Unit: mm

Unit: mm

Unit: mm

NWW-65 NQA-4288

(NCM-227D)

CABLE INLET

2 CABLES

CABLE INLET

1 CABLES



9 1. Introduction

1.5 System Configuration

( Y A R D M A X 1 5 m )

N W W

- 6 5

M A I N D I

S P L A Y

N K

F - 5 4 7

T R A N

S D U C E R

N K F - 5 3 1 E

T R A N S D U C E R

( O p t i o n )

2 5 0 V - T T Y C S - 4 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

0 . 6 / 1 k V D P Y C - 1 . 5 ( Y A R D )

2 5 0 V - T T Y C S - 1

( Y A R D )

S H I P ’ S M A I N

5 0 / 6 0 H z 1 0 0 / 1 1 0 / 1 1 5 / 2 2 0 / 2 3 0 V A C 1 P h

a s e

2 4 V D C ( f o r P o w e r F a i l A l a r m )

A N A L O G 2

N M E A 1

N M E A 2

N M E A 3

N M E A 4

N M E A 5

N M E A 6

N M E A 7

N M E A 8

L O G 1

L O G 2

L O G 3

L O G 4

C F Q - 7 2 2 1 ( J R C 5 m )

C F Q - 7 2 2 2 ( J R C 5 m )

2 5 0 V - T T Y C - 4 S ( Y A R D M A X . 5 0 0 m )

T r a n s d u c e r C a b l e

( J R C M A X . 3 0 m )

T r a n s d u c e r C a b l e ( J R C M A X . 2 5 m )

J L N - 2 0 5 D O P P L E R L O G ( S D

M E )

F i g u r e 1 . 1 4

O V E

R A L L S Y S T E M B L O C K

D I A G R A M

A N A L O

G

o u t p u t

I E C 6 1 1 6 2 - 1

o u t p u t

2 0 0 p u l s e / n m

o u

t p u t

N J C - 2 5

S I G N A L

P R O C E S S O R

C F Q - 7 2 2 1 ( J R C 5 m )

C F Q - 7 2 2 2 ( J R C 5 m )

2 5 0 V - T T Y C S

- 7 ( Y A R D M A X . 1 0 0 m )

T T Y C S - 4

N Q

A - 2 0 2 5

J U N C

T I O N B O X

(

O p t i o n )

N W

W - 6 5 S

S L A V

E D I S P L A Y

( O p t i o n )

N C M - 2 2 7 D

D I M M E R U N I T

( O p t i o n )

2 5 0 V - T T Y C S - 1 ( Y A R D

M A X . 1 0 0 m )

2 5 0 V - T T Y C S - 4

( Y A R D M A X . 1 0 0 m )

G P S I E C 6 1 1 6 2 - 1

I n p u t ( f o r G P S s p e e d d i s p l a y )

2 5 0 V - T T Y C S - 1

( Y A R D )

P F A L A R M

P o w e r F a i l A l a r m

o u t p u t

N Q A - 4 2 8 8

S I G N

A L

D I S T R I B

U T O R

N W W - 2 4 / 2 5 / 2 6

A N A L O G D I S P L A Y

( O p t i o n )

N W

W - 5 / 7 / 1 6

R E M O T E D I S P L A Y

( O p t i o n )

N C M - 3 2 9

D I M M E R U N I T

( O p t i o n )

2 5 0 V - T T Y C S - 4

( Y A R D M A X . 1 0 0 m )



2. Names and Functions of the Components 10

2. Names and Functions of the Components

The panel keys and their functions are shown below.

Main Display

Figure 2.1 Operation Panel in the Main Display

No. Keys Functions

• Power ON is done when pushing during long time (2 seconds or

more) until the buzzer sound ‘pi’ are heard.

1 Power

• Push this key and the key to turn off the power.

2 Clear • The menu is ended.

• The assistance buzzer is stopped.

Dial

Down Up

• Turn to select menu.(Turn dial counterclockwise to scroll downward and turn it clockwiseto scroll upward.)

• Selects menu items.

• Sets numeric values when menu items are numeric entry.(The numbers change faster, when the dial is turned faster.)

3

Push (Press dial) • Push the dial to select a menu or to enter a setting.

• The TRIP value is reset when pushing during long time.

• Push this key and the key to display the menus.

4 Mode • Whenever every pushing, the display mode changes.

• The speed unit changes if it pushes during long time.

5 Contrast • Turn to Dimmer and Contrast menu.

• Dimmer and Contrast return to the default value (DIM=5,CNT=3)when pushing during long time.

3

4

5

2 1

LCD Display

Buzzer

OFFPWR

OFF

CLR

MODE

CONTDIM

OFFCLR

CONT

DIM



11 3. Installation

3. Installation

Do not use this unit at a voltage other than the supply voltage stated on the unit.Otherwise, a fire, an electrical shock, or a failure may occur.

Do not any maintenance on the transducer while the ship is in the water. Doing somay cause injury or water leakage to the ship.

Contact our service center or agent for any electrical work or installation of this unit.With the exception of qualified service personnel, do not attempt to service this unit,as doing so may cause malfunction.

When installing this set, be sure to connect the grounding wire or the grounding plateto the grounding terminal of the unit. Otherwise, you may suffer an electrical shockduring a failure or leak.

Do not install this unit is exposed to direct sunlight for a long time or the place where

hot wind is hit or the temperature rises above 55°C. Doing so may cause a fire or a breakdown.

Do not place the unit on a wobbly stand or any unsteady foundation. Doing so maycause the unit to fall resulting in injury or damage.

Do not put this unit in the cabinet, and do not cover with the cardboard etc. Heatshuts oneself up, and doing so may cause a fire or a breakdown.

Reasonable care must be exercised for the routing of the transducer cable, power

cable, signal cable and grounding cable. Otherwise, the unit may adversely effectother equipment or vice versa.



3. Installation 12

1. Screw M4 L=40mm

2. Nut

3. Washer

4. Spring washer

anel

3.1 Installing the Main Display Unit

Mounting Location

• As the signal cable may receive or generate noise, install the unit in a place that is free of

interference.

Mounting Procedure

(1) Disk Form type (NWW-65A)

• The bracket is fixed by four tapping screws or bolts of M5.

• Adjust the direction up and down and right and left of the Main Display unit to the best

viewing angle.

Figure 3.1 Adjustment best viewing angle

(2) Console mount type (NWW-65B)

• The corner hole of 98×170mm is made for the panel, and the hole of dia-5mm is

made for four places.

• It fixes from the back with M4 screw of 40mm in length.

Figure 3.2 Console mount

Do not install the unit near DSB devices, amateur radio or their coaxial cables.CAUTION !



13 3. Installation

3.2 Installing the Signal Distributor Unit

Mounting Location

• As the signal cable may receive or generate noise, install the unit in a place that is free of

interference.

• It vertically installs it in the wall so that the cable inlet may become it below.Mounting Procedure

• It fixes to the wall in four the M8 volts.

• The earth cable is used and grounded from the cable clamper.

3.3 Installing the Signal Processor Unit

Mounting Location

• The unit install in the distance that the transducer cable reaches. Because the IP grade is IPX5, this unit is usually installed in boatswain’s store.

• As the transducer cable may receive or generate noise, install the unit in a place that is

free of interference. Usually, it covers the cable with the piping of the exclusive use from

the transducer to the signal processor.

• It vertically installs it in the wall so that the cable inlet may become it below.

Mounting Procedure

• It fixes to the wall in four the M8 volts.

• The earth terminal is used and grounded the copper plate of 30mm or more in width.

3.4 Mounting the Transducer

Mounting Location

• This equipment measures the speed of the ship by using the ultrasonic wave.

To cause attenuation and diffusion when the bubble influences the ultrasonic wave, this

equipment cannot measure an accurate speed of the ship.

Mounting Procedure

• After the welding of tank ends, the transducer is installed. If the transducer is built into

the tank, after it is detached from the tank, and the tank is welded.

• The tank is welded so that surface of transducer at the sailing may become within 2° for a

horizontal plane.

• The tank is installed within 5° so that the bow mark may become parallel to the keel line.

It is necessary to choose the place where the bubble is not generated when sailing,and to install the transducer. The transducer is installed in place before 1/10 of the

ship’s lengths in the large vessel. Moreover, the transducer is installed in place

before it when there is bow-thruster.

CAUTION !



3. Installation 14

3.5 Connection Diagram



15 4. Operation

4. Operation

Do not place a vessel containing water, etc. or a metallic object on this unit. When

water spills or when water or the object enters the unit, a fire, an electrical shock, or

a failure may occur.

Do not use this unit at a voltage other than the supply voltage stated on the unit.

Otherwise, a fire, an electrical shock, or a failure may occur.

Do not insert or remove the power cord or operate switches with a wet hand.Otherwise, you may suffer from an electrical shock.

Do not damage or modify the power cord. Placing a heavy object onto, heating,

stretching or bending the cord may cause a fire or electrical shock.

Do not bring the unit in a cooled state abruptly into a warm room. A high voltage

may leak due to condensation may result in failure. In this case, use the unit set after

leaving it alone for 30 min.

Do not turn on the power switch of the unit while the ship is on the shore. Otherwise,the transducer may malfunction.



4. Operation 16

4.1 Overview

When the setup operations described in Chapter 3 have been completed, turn on the power to start

operation. This chapter describes the basic flow of operations. The bold line boxes indicate user

operations.

Turn on the power.

See Section 4.2 ( Use key )

See Section 4.3

See Section 4.3

It will automatically change into the normal display in about 30 seconds.

The screen where it is made to display is selected.


Adjust LCD contrast and LCD and key back lighting as required.


The TRIP value is reset when pushing during long time.


The unit of Speed is changes when pushing during long time.


A set menu enters the mode.

See Section 4.8 ( Use + key )

All current setting are saved. Turn off the power.

See Section 4.2 ( Use + key )

Initial screen

Self test

Contrast anddimmer

Display Mode

selection

Settings

Power OFF

Display Data receive

MODE

OFF

PWR

OFF

CLR

CONT

DIM

Trip reset

Unit selectionMODE

OFFPWR

Power ON

CONT

DIM



17 4. Operation

4.2 Turning the unit ON/OFF

• When key is pushed for about 2 seconds or more, the power turns ON and the buzzer sound

‘ pi ‘ rings.

• When key and key are pushed at the same time, the power turns OFF.

4.3 Initial screen / Self test

When the power is turned ON, the initial screen is

displayed.

The self test is executed and ‘ Main/Int Ok ’ is displayed

if a problem is not found.

After the initial screen is displayed for about 8 seconds,the screen disappears but after about 30 seconds it

automatically goes back to the normal screen.

Figure 4.1 Initial Screen

4.4 Normal screen

Next, explains the screen by using display item.

WT : Water Tracking speed.

: The oval rotates to indicate that it is receiving

the shown data.

: Fore speed ( Colored indicates effective)

: After speed

: Measured speed

( The 10th

digit zero suppressed. )

: Speed unit (See Section 4.8 )

Odo : Total distance

Figure 4.2 Normal screen 1 (The 10th

digit or more is zero suppressed.)

Trp : Trip distance

(The 10th

digit or more is zero suppressed.)

Total distance counter is used to calculate the total run distance of the whole journey.

Trip distance counter is used to calculate the distance of each individual segments between the

points.

When turned on, after Odo and Trp displays 00000.00nm for a few seconds, displays Odo and Trp

are displayed which was displayed before turning off the display.

OFF

PWR

OFF

CLROFF

PWR

DopplerJRC JLN-205

L O GR. 1.00 Main / Int OK

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m

Trp 1 2 3 4 5 . 6 7 n m



4. Operation 18

• The screen changes whenever the key is pushed.MODE

Figure 4.6 Large character screen

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m

Trp 1 2 3 4 5 . 6 7 n m

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m

WT . Speed

12.3kn

WT . Speed

kn

12.3

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m

Trp 1 2 3 4 5 . 6 7 n m KeyAssign

MOD+PUS=MENU PUSH/L=Trp→0MODE/L=UNIT CLR=AlarmOff

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m

KeyAssignMOD+PUS=MENUMODE/L=UNIT CLR=AlarmOff

WT . Speed

12.3kn

KeyAssignMOD+PUS=MENUMODE/L=UNIT CLR=AlarmOff

Figure 4.3 Normal screen 1



Figure 4.7 KeyAssign screen 1



Figure 4.10 Graphic screen

WT . Speed

O d o1 2 3 4 5. 6 7 n m

T r p1 2 3 4 5. 6 7 n m

5

0

10 1520

25

30

3540

.0

.2

.4.6

.8

12.kn

34



19 4. Operation

4.5 Adjusting Contrast and Back Lighting

This function adjusts LCD contrast and LCD and key back lighting for the display.

(1) Push

Indicates a menu for changing the contrast

and back lighting.The present set value is shown in reversed

character.

DIM : back lighting can be changed.

DIM: 5 ( LCD and back lighting key )

CNT: 3 ( LCD contrast )

Figure 4.11 Adjusting DIM

(2) Turn to select the desired back lighting.

Setting range for back lighting : 0 to 9 ( Brighter when the numerical value is large. )Push to end the setting menu.

(3) Push to make t the contrast possible to

change.

(4) Turn to select the desired contrast. Figure 4.12 Adjusting CNT

Setting range for contrast : 0 to 9

(Enlarge the numerical value when seeing from the upper surface of LCD. )

Push again to change the back lighting again.

(5) Push or wait for 1 minute to return to the previous screen.

4.6 Trip Distance Reset

Resetting the Trip Distance.

Push for a while.

A buzzer sound ‘ pi ‘ rings first, then sound ‘ pi pi ‘ rings.

*****.**nm → 0.00nm

This function is effective only on the screen where Trip Distance is displayed.

CONT

DIM

DIAL

OFF

CLR

PUSH

DIAL

OFF

CLR

PUSH

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m


PUSH=CNT CLR=RET/ExitROT=Adjust CLR=AlarmOff

Menu

DIM 0 1 2 3 4 5 6 7 8 9

CNT 0 1 2 3 4 5 6 7 8 9

5

3

DIM

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m

Trp 1 2 3 4 5 . 6 7 n m

KeyAssignPUSH=DIM CLR=RET/ExitROT=Adjust CLR=AlarmOff

Menu

DIM 0 1 2 3 4 5 6 7 8 9

CNT 0 1 2 3 4 5 6 7 8 9

5

3CNT

PUSH



4. Operation 20

4.7 Vessel Speed Unit

Push for a while.

A buzzer sound ‘ pi ‘ rings first, then sound ‘ pi pi ‘ rings.

The unit of the ship’s velocity changes alternately whenever this operation is done.

kn (default ) ↔ m/s 1 [m/s] = ( 1852m ÷ 3600sec ) × 1[kn]

4.8 Menu Setting

Setting Item ‘Alarm, Click, WT/GPS, Smooth, HiSpeed, LowSpeed’.

(1) Push and key at the same time to display the Menu Setting screen.

This operation displays the screen for the menusetting. It returns to the previous screen when

nothing is done for about 1 minute.

Alarm: on/off for system warning system

Click : on/off for buzzer ( can be changed )

WT/GPS: selecting WT or GPS speed

Smooth: setting the average time

In addition, when scrolled,

HiSpeed : setting an alarm for upper speed limit. Figure 4.13 Menu Setting

LowSpeed: setting an alarm for lower speed limit.

(2) Turn to select the Menu.

Turn the dial counter clockwise to scroll downward and turn it clockwise to scroll upward.

The selected item blinks.

(3) Push to selected item.

(3-1) Alarm : ON/OFF for system warning

alarm sound.

Turn to select Off or On.


Off: Warning alarm sound off.

On : Warning alarm sounds on. ( default )

Figure 4.14 Alarm Setting

Push to return to the Menu Setting screen.

After setting, push key again to return to the normal screen.

MODE

PUSH

DIAL

PUSH

DIAL

OFF

CLR

CONT

DIM

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m


ROT=Select CLR=RET/ExitPUS=Enter CLR=AlarmOff

M E N U

A l a r m

C l I c k

W T / G P S

S m o o t h

W T / G P SC l i c k

OFF

CLR

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m


ROT=Change CLR=RET/ExitCLR=AlarmOff

Menu

A l a r m Off On On



21 4. Operation

Under the following condition, a warning message and a warning sound generate.

( Warning sign is not related to the Alarm Setting, and will be displayed. )

• When you reach the condition of HiSpeed and LowSpeed limit. (See 3-5)

• When the state of the reception signal is bad, and the vessel speed cannot be computed.

• When there is a problem in the system.

Please refer to Section 4.9 "Warning display" for more details of warning.

(3-2) Click : Selecting ON/OFF for the operation sound.

Turn to select Off or On.


Off: Buzzer sound off.

On : Buzzer sound on. ( default )

Push to return to the Menu Setting screen.To end the menu, push key again to return

to the normal screen.

Figure 4.15 Click Setting

(3-3) WT/GPS : Selecting the vessel speed display.

Turn to select WT or GPS.


WT: WT speed is displayed. ( default )

GPS: GPS speed is displayed.

(It is necessary to connect the GPS receiver.)

Push to return to the Menu Setting screen.

To end the menu, push key again to return

to the normal screen. Figure 4.16 Mode Setting

(3-4) Smooth : Setting the Averaging time of WT speed

The averaging time to enable the measurement

and display of vessel speed is set.

If a large value is set, the tracking time becomes

long though the display speed is steady.

( default : 010 )

Turn to select the digit and the

available digit is shown in the reversed character.

Push to fixed. The selected item blinks.

Figure 4.17 Damping Setting

OFF

CLR

DIAL

OFF

CLR

DIAL

DIAL

PUSH

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m



Menu

C l i c k Off On On

OFF

CLR

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m



Menu

M o d e GPS WT

OFF

CLR

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m



Menu

Damping 0 0 [S] 1



4. Operation 22

Turn to set a number from 0 to 9. Push to fix the number.

Also, when another digit is changed, turn to select digit to change.

To end the Average time setting, push to return to the Menu Setting screen.

To end the menu, push key again to return to the normal screen.The useful range is 0-240. However, the range of 0-120 is usually used. ( default : 010 )

(3-5) HiSpeed : Vessel speed alarm ( Upper Limit )

Setting vessel speed alarm to upper speed limit. When the vessel speed becomes more than the

set value, the warning sound and the warning message are displayed. ( default : 00.0 )

Turn to select the digit to change.

The available digit is shown in the reversed

character.Push to change.

The selected number blinks.

Turn to select the numerical from 0 to 9.

Push to change the numerical value.

Figure 4.18 HiSpeed alarm Setting

In addition, when another digit is changed, turn to select the digit.

To end the vessel speed alarm setting, push to return to the Menu Setting screen.

To end the menu, push key again to return to the normal screen.

The useful range of the setting is 0-40. Minus cannot be set. ( default : 00.0 )

When the set value is 00.0, means that the vessel speed alarm is Off.

(3-6) LowSpeed : Vessel speed alarm ( Lower Limit )

Setting vessel speed alarm to lower speed limit. When the vessel speed becomes slower than

the set value, the warning sound and the warning message are displayed. ( default : 00.0 )

Turn to select the digit to change.

The available digit is shown in the reversed

character.

Push to change. The selected number

blinks.

Turn to select the numerical from 0 to 9.

Push to change the numerical value.

In addition, when another digit is changed,

turn to select the digit. Figure 4.19 LowSpeed alarm Setting

To end the vessel speed alarm setting, push to return to the Menu Setting screen.

OFF

CLR

DIAL

OFF

CLR

DIAL

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m



MenuH i = 0 . 0 [kn]2

DIAL

PUSH

DIAL

OFF

CLR

OFF

CLR

DIAL

OFF

CLR

OFF

CLR

WT . Speed

12.3kn

Odo 1 2 3 4 5 . 6 7 n m



Menu

Low = 0 . 0 [kn]1

DIAL

PUSH

DIAL

OFF

CLR

OFF

CLR

DIAL



23 4. Operation

To end the menu, push key again to return to the normal screen.

The useful range of the setting is 0-40. Minus cannot be set. ( default : 00.0 )

When the set value is 00.0, means that the vessel speed alarm is Off.

4.9 Warning message

This equipment is always monitoring the vessel condition. One like when vessel speed reaches the

upper and lower speed limit. Second, like when the state of the reception signal is bad, and the

vessel speed cannot be computed. Third, when there is a problem in the system of the equipment.

When a problem is found, a warning message will be displayed on the LCD screen. This warning

message cannot be erased. A warning sound rings too, when the setting of Section 4.8(3.1 Alarm)

is set to "On". The following are the table of the warning message, the condition which warning

is generated, and the possible cause.

No Warning message Condition which warning is generated Possible cause

1 Speed Lost Vessel speed cannot be operated. The degrade of signal reception and

increase of noise. Bubble took place

on the surface of the transducer.

2 Hi Speed Vessel speed is more than the set value. ---

3 Low Speed Vessel speed is lower than the set value. ---

4 NG:URT Data Lost The self test data cannot be obtained. The software version between NQA

and NJC unit doesn’t match.

5 NG:Disp RxT Data The indicator cannot obtain the displaydata.

The communication between theequipments is defective.

6 NG:Proc RxT Data A measurement condition is not set to the

processor.

The communication (receiver) error

of the NJC.

7 NG:Tmnl TxD TB There is no display data to the indicator,

in the terminal of the distributor.

The communication (transmitter)

error of the NQA.

8 NG:Tmnl TxD Pin There is no display data to the indicator,

in the distributor.


error of the NQA, The NWW or

NJC is defective.

9 NG:Tmnl RxD Pin The display signal from the indicatorcannot reach the distributor.

The communication (transmitter)error of the NWW. The communi-

cation (receiver) error of the NQA.

10 NG:Tmnl TxP Pin There is no signal to the processor, in the

distributor.

The communication (transmit) error

of the distributor.

11 NG:Tmnl TxP TB There is no signal to the processor, in the

terminal of the distributor.


error of the NQA.

12 NG:Tmnl RxP Pin The signal from the processor cannot

reach the distributor.

The communication (receiver) error

of the NQA.

Warning message No.4-12 will be displayed by the following word "- System Error -".

When there is more than 5 warning from warning message No.4-12, there will be a message in the lower part

of the screen “too many errors".

OFF

CLR



5. Detail Setting 24

5. Detail Setting

This section is set to confirm the operation in detail, after "Installation" in Section 3.

This operation is not needed when there is no change in the connection etc.

5.1 Initial operation of Detail Setting

The detail setting cannot be operated if the following procedure is not executed to

prevent miss-operation.

• When key is pushed for about 2 seconds or more, the power turns ON and the buzzer

sound ‘ pi ‘ rings.

• When "Figure 4.1 initial screen" is displayed, push key for a long time until the buzzer

sound ‘ pi pi ‘ rings.V.--.--- will be displayed on the lower left of the screen.

This screen entered a mode which is able to set detail

This screen will automatically change into the normal

screen in about 30 seconds.

This mode is effective until turning off power.

Figure 5.1 Initial screen of Detail Setting

5.2 Detail setting

In addition to Section 4.8 "Menu setting", will set specification of the parameter output, and the

detail of the dummy output etc.

(1) Push and key at the same time to display the detail setting menu.

It returns to the normal screen if nothing is operated for 1 minute.

The following operation method is the same as Section 4.8 "Menu setting" so refer to it.

(2) Set by the detail setting menu table on the next page.

OFF

PWR

DopplerJRC JLN-205

L O GV.10.10M Main / Int OK

OFF

CLR

By operating like mentioned above, and the time

pushing the key is too short, and the buzzer

sound 'pi' rings only once, the screen disappears

temporarily but this is not a trouble on the equipment.

Wait for about 30 seconds or push key and the

screen goes back to the normal screen.

CAUTION !

OFF

CLR

OFF

CLR

PUSH

CONT

DIM



25 5. Detail Setting

PUS

PUS

PUS

No Item Menu Setting default Unit Function

1 Alarm Alarm Off On --- On/Off for warning sound

2 Click Click Off On --- On/Off for operation sound

3 WT/GPS Mode WT GPS --- Display mode of vessel speed

GPS receiver is necessary

4 Smooth Damping 0 1 0 [S] Average time: 10 to 240S

5 HiSpeed Hi 0 0 . 0 [kn] Upper speed alarm:0 to 40kn

‘00.0’ means alarm Off

6 LowSpeed Low 0 0 . 0 [kn] Lower speed alarm:0 to 40kn

‘00.0’ means alarm Off

Same as the

Section 4.8.

It is possible toset from either

menu.

7 Adjust Correct + 0 0 . 0 [%] Speed correction :-50.0 to +99.9%

‘+’ means the display speed increases

8 NMEA1 NMEA1 1 . 5 2 . 3 --- Out put Version of IEC61162-1:2000

NMEA 1 to 49 NMEA2 NMEA2 1 . 5 2 . 3 --- Out put Version of IEC61162-1:2000

NMEA 5 to 8

10 Puls1 Puls1 0 2 x100 Pulse rate of output：0 to 20x100P/nm

LOG 1,2


LOG 3,4


LOG Relay (‘00’ means output OFF)

13 Scale Analog 3 0 [kn] Scale adjust of Analog display:10 to 40kn14 MF-NO FS2-MFNO 100 ---

15 MF-MI FS2-MFMI 025 ---

16 MF-WD FS2-MFWD 015 ---

17 LE-NO FS2-LENO 005 ---

18 LE-WD FS2-LEWD 094 ---

19 AVG FS2-WTAVG 120 ---

Do not change the set value.

20 Odo -- > Odo ReSet ― This resets the Total distance.

Push for a long time. It returns by .

After power is On, it is effective only for 1 minute.21 ReSet Master ReSet ― This returns each menu setting to the default value.

Total distance is not reset by this operation.

Push for a long time. It returns by .

22 Txoff TX On Off ― When turned OFF transmission stops. It returns On

by turning on power again. Use On normally.

23 Dummy Dummy Off 0 18 [kn] The dummy speed is displayed except when turned

OFF. Everytime is pushed, 18,36,40,-5,18kn is

displayed. The external output is the same. The

transmission is stopped when the dummy is

displayed. It returns Off by turning the power on

again. Use Off normally.

OFFCLR

OFFCLR



6. Maintenance 26

6. Maintenance

Do not check or repair in this unit. Please call our field representative or your nearest

JRC office for inspection and repair services. It causes it of a fire or electrical shock.

Do not remove the cover of this unit. Otherwise, you may touch a high-voltage part

and suffer from an electrical shock.

Turn off the power on/off switch, and turn off the power supply breaker when you do

the maintenance check of this unit. Otherwise, a fire, an electrical shock, or a failure

may occur.

Do not disassemble or modify this unit. Otherwise, a fire, an electrical shock, or afailure may occur.

Do not any maintenance on the transducer while the ship is in the water. Doing somay cause injury or water leakage to the ship.

In the event that you spill or drop any liquids or metals etc., turn off the unit, turn offthe power supply breaker, and contact your sales agent outlet or one of JRC branchoffices, sales centers or liaison offices. Continuing operation as is may cause a fire,electric shock or malfunction.

In the event that smoking or burning odors are detected, immediately terminateoperation of the unit and contact your sales agent outlet or one of JRC branch offices,sales centers or liaison offices. Continuing operation as is may cause a fire orelectrical shock. Never attempt to service the interior of the unit.

Do not use an organic solvent such as thinner or benzine when you clean the surfaceof the unit. For cleaning the surface, remove the dust and refuse and wipe with cleandry cloth. Otherwise, the painting on the surface may be damaged.



27 6. Maintenance

6.1 Daily maintenance

Do not remove the cover of this unit. Otherwise, you may touch ahigh-voltage part and suffer from an electrical shock.

Turn off the power on/off switch, and turn off the power supply breaker when you do the maintenance check of this unit. Otherwise, afire, an electrical shock, or a failure may occur.

Do not use an organic solvent such as thinner or benzine when youclean the surface of the unit. For cleaning the surface, remove the dustand refuse and wipe with clean dry cloth. Otherwise, the painting onthe surface may be damaged.

The life of the device depends on how daily maintenance and inspection are performed carefully.

To keep the device in the best condition at all times, it is recommendable to perform periodical

inspections constantly. Any failure in the device can be prevented before it occurs through such

inspections. Please perform the inspections shown in the table below periodically.

• Remove stains from the panel face, knob, panel keys, top cover by wiping them lightly with

dry cloth.• Check knob, panel keys, loosening of the connector and starting the omission, and it

tightens correctly.

• Check loosening and rattling of the screw bolt that is the fixation of the case, and

it tightens surely.

6.2 Troubleshooting for Malfunctions or Abnormalities

In the event that smoking or burning odors are detected, immediatelyterminate operation of the unit and contact your sales agent outlet orone of JRC branch offices, sales centers or liaison offices. Continuingoperation as is may cause a fire or electrical shock. Never attempt toservice the interior of the unit.

When the following symptom exists, it is thought abnormality or the breakdown. Use is stopped at once.

• The power supply doesn't enter.

• Nothing is displayed on the screen.

• Smoke has risen from the units.

• It smells strange.

• It is abnormally hot.



7. Consider Installation 28

7. Consider Installation

Do not install this unit is exposed to direct sunlight for a long time or

the place where hot wind is hit or the temperature rises above 55°C.Doing so may cause a fire or a breakdown.

Do not place the unit on a wobbly stand or any unsteady foundation.Doing so may cause the unit to fall resulting in injury or damage.

Do not put this unit in the cabinet, and do not cover with the cardboardetc. Heat shuts oneself up, and doing so may cause a fire or a breakdown.

Do not bring the unit in a cooled state abruptly into a warm room. Ahigh voltage may leak due to condensation may result in failure. Inthis case, use the unit set after leaving it alone for 30 min.

Avoid the installation of those units in the following places.

Otherwise, a failure will occur or the life of the set will be shortened.

• A place exposed to direct sunlight.

The temperature in the unit might rise, and it damages it.• A place exposed to water splash.

The units are not a complete waterproof construction. The IP grade of Section 1.3

"Components" is confirmed. Do not set it up in severe place more than grade.

It is likely to be flooded internally, and to damage it.

• A place with poor ventilation

When the units are set up in the place where ventilation in the cabinet and the box, etc. is

bad, the power supply part and the transmission part might overheat, and be damaged

abnormally.



29 8. After-Sales Service

8. After-Sales Service

8.1 When ordering a repair

When a failure has been detected, stop operation and contact the dealer or agent from which you purchased the device or one of our branches, marketing offices, and representative offices.

• Repair during warranty period

Should a malfunction occur when the unit has been operated according to descriptions and

instructions in the instruction manual, it will be repaired free of charge. However, breakdowns

resulting from abuse, negligence, natural disaster, fire or other unforeseeable incident will be

charged.

• Repair after warranty periodRepairs that restore normal operation made after the warranty period have to be paid in full by

the client.

• Product data that should be provided when you ask for service

Name of product, model, date of manufacture and serial number

Description of malfunction (as detailed as possible)

Company address or name of organization, address and telephone number

8.2 Recommendation of overhaulThe performances of the set may deteriorate due to the aging of parts, and so on through the rate

varies depending on the conditions of use. So it is recommendable to contact the dealer from which

you purchased the device or one of our marketing offices for overhaul apart from daily service.

Incidentally, such overhaul will be performed with charge.

Please contact the dealer from which you purchased the device or our marketing office that is

nearest to you for any question as to the after-sales service.



9. DISPOSAL 30

9. DISPOSAL

9.1 Disposal of the Equipment

Observe all local laws and regulations when disposing of those units.

The battery is not used for those units.



31 10. SPECIFICATIONS

10. SPECIFICATIONS

Operation system : Dual - beam pulse Doppler system

Operation frequency : 2MHz

Speed measurement range : –10.0 to +40.0 kn

Run distance display range : 0 to 99999.99nm

(However, NWW-7 of the option is 0 to 9999.99nm )

Water depth : Relative speed to water of depth greater than 3 meters below hull bottom

Speed accuracy : ±1% or ±0.1kn whichever value is greater

Distance accuracy : ±1% or ±0.1nm in each hour whichever value is greater

Display : Digital display Speed unit = kn or m/s

: Analog display (option)

IEC61162-1 input : GPS (for GPS speed display)

(Sentence ; $--RMC, $--RMA, $--VTG)

IEC61162-1 output : NMEA0183 Ver. 1.5 or 2.3 -------------- 8 circuits

(Sentence ; $VDVBW, $VDVLW)

Other output : Ship speed ---------------------------------- 2 circuits

DC voltage signal for analog display (-2VDC to +10VDC)

: LOG pulse ---------------------------------- 4 circuits

Opto-coupler signal (200 pulses/nm, 30V, 50mA max)

: LOG signal --------------------------------- 1 circuit

Relay closure signal (200 pulses/nm, 30V, 1A max)

: Slave display signal ----------------------- 2 circuits

: Distance signal ----------------------------- 1 circuit

: Remote display signal -------------------- 1 circuit

: On-line maintenance ---------------------- 1 circuit

: Power fail alarm --------------------------- 1 circuit

Relay closure signal (250V, 5A max)

Power supply : 100/110/115/220/230VAC ±10%, 1φ , 50/60Hz, 100VA or less

Operating temperature range : –15 to +55°C

Operating humidity range : +40°C, 93%



APPENDIX 32

APPENDIX1. Remarks on Error resulting from deviation of radiation angle from the reference value

Hull movement causes deviation of radiation angle

from the reference value.

Generally, the dual beam shown in Fig. 11.1 a) isoften adopted in the Doppler Log in order to reduce

the error caused by various hull movements. The

following discusses this tolerance in comparison

with the single beam method.

1.1 Error caused by hull movement

The speed error caused by a deviation angle such as rolling and pitching is indicated by Fig.11.4.

An explanation how this is calculated is shown below.

(1) Vertical velocityOnly the velocity in the horizontal direction is important for ship. Vertical velocity is also caused

by swell and other factors, and appears in the form of an error.

When the horizontal velocity is assumed as U, as shown in Fig. 11.2, the Doppler shift frequency

f d1 with respect to beam N1 is expressed by the following equation 11.1.

f d1 =2f 0C

(Vcos θ1 – Usin θ1) (11.1)

Similarly, Doppler shift frequency f d1 with

respect to N2 is expressed by the followingequation 11.2.

f d2 =2f 0C

(-Vcos θ2 – Usin θ2) (11.2)

Assuming that θ1 = θ2, we get (11.3) in the

dual beam.

f d = f d1 – f d2 =4f 0V

C cos θ1 (11.3)

The vertical velocity components cancel each other, without affecting the Doppler shift frequency.

Thus, the Doppler shift frequency is double that of the single beam method.

(2) Trim and heel

When there is an offset of δ with

respect to the vertical line as shown in

Fig. 11.3, the Doppler shift frequencies

occurring to the beams N1 and N2 are

expressed by the following equations,

respectively:

f'd1 =2Vf 0

C (cos θ cos δ – sin θ sin δ)

Fig. 11.1 Doppler effect

N2 N1 N

Throughthe water

Throughthe water

a) Dual beam

Fi . 11.2 Effect of vertical velocit

Throughthe water

N1 N2

Fig. 11.3 Vertical offset errors

Throughthe water

N1

N2



33 APPENDIX

f'd2 =2Vf 0

C (cos θ cos δ + sin θ sin δ)

The error due to dual beam is obtained from Eq. 11.4.

εδ = 100 (cos δ – 1) % (11.4)

The error in single beam method is expressed by Eq. 11.5.

ε'δ = 100 (cos δ + tan θ sin δ – 1) %

or ε'δ = 100 (cos δ – tan θ sin δ – 1) % (11.5)

Thus, it can be seen that the error due to dual beam is always negative, independently of the beam

radiation angle.

The following calculate an error when an offset of 5° degrees has occurred:

ε δ = - 0.38 % ←JLN-205

ε'δ = -32.1 or –32.9 %

The dual beam has a smaller error than thesingle beam method, and is therefore more

advantageous.

(3) Error due to pitching and rolling

When pitching and rolling have occurred, we

get the same result as when δ in Eq. 11.4 and

Eq. 11.5 is assigned with the following values:

δ → δ (t) = δm sin ωt

δm = Maximum deflection angle

ω = Angular frequency of motion

The average Doppler shift frequency in dual

beam can be expressed by the following:

f'd = f'd1 –f'd2 =1T ∫

−

2

T

2

T

cos θ cos δ (t) dt

=4Vf 0

C cos θ ⋅

ω2π ∫

ω

π

ω

π−

cos (δmsin ωt) dt

=4Vf 0

C J0 (δm) (11.6)

The average error is obtained as follows:

ε δm = 100 {J0 (δm) –1} (11.7)

The above-mentioned relationship is shown in Fig. 11.4.

Fig. 11.4 Errors due to dual beam vertical offset

Static errorTrim and heel

Dynamic error Roll and Pitch



APPENDIX 34

2. Outline and Setting drawing

(1) NWW-65A MAIN DISPLAY (Desk form type)

U n i t : m m

8 4

± 0 . 5

74±0.5



35 APPENDIX

(2) NWW-65B MAIN DISPLAY (Console mount type)

1 7 9 ± 0 . 5

U n i t : m m



APPENDIX 36

(3) NQA-4288 SIGNAL DISTRIBUTOR

U n i t : m m



37 APPENDIX

(4) NJC-25 SIGNAL PROCESSOR

6 k g

U n i t : m m



APPENDIX 38

(5) NKF-547 TRANSDUCER

U n i t : m m



39 APPENDIX

(6) NKF-531E TRANSDUCER (option)

U n i t : m m

± 2



APPENDIX 40

3. Spare Parts List

SHIP No. SPARE PARTS LIST FOR U S ESET PER

VESSEL

MODEL JLN-205

Doppler Log

QUANTITY REMARKS

WORKINGITEM

No.

NEME OF PART

OUTLINE

(Dimension in m/m) PER

SET

PER

VESS

SPAREDESCRIPTION

JRC CORD No.

SUB

MARK OF

BOX No.

1 Fuse

20

1 2MF51NR0.5

5ZFAA00147

2 Fuse

20

3 2250V A TSC2A

5ZFCA00118

3 Fuse

20

1 2215 3.15

5ZFAP00101

4 Fuse

20

1 2ULT SC 6.3AN1

5ZFCA00034

MFR’S NAME JAPAN RADIO CO.,LTD. DRW. No. 7ZXBS0020

φ 5 . 2

φ 5 . 2

φ 5 . 2

φ 5 . 2

JLN-205 Speedlog Instruction Manual

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Transcript of JLN-205 Speedlog Instruction Manual