YOKOGAWA EML500 Series User manual

ELECTROMAGNETIC LOG
EML500 Series
User’s Manual
IM 80B80T10E
IM 80B80T10E
21th Edition

i
IM80B80T10E 21th Edition : Jul.1,2007-00
CONTENTS
FOREWORD.............................................................................................................v
1. INTRODUCTION........................................................................................ 1-1
1.1 Components and Their Functions .................................................................. 1-1
1.2 Starting and Stopping ...................................................................................... 1-3
1.3 Summary of Functions..................................................................................... 1-5
2. OVERVIEW ................................................................................................ 2-1
2.1 General............................................................................................................... 2-1
2.2 Principle ............................................................................................................ 2-1
2.3 PerformanceandSpecications.................................................................... 2-2
2.4 Handling Precautions ...................................................................................... 2-6
3. Components ............................................................................................. 3-1
3.1 SystemConguration ...................................................................................... 3-1
3.2 Component Models .......................................................................................... 3-2
3.3 Components and Their Functions .................................................................. 3-3
3.3.1 Sensor Unit ........................................................................................3-3
3.3.2 Junction box : LN052 .........................................................................3-5
3.3.3 Master Unit : LT501............................................................................3-5
3.3.4 Master Indicator : LR523....................................................................3-5
3.3.5 Speed Indicator :
LR524 ( single-indication ) and LR525 ( dual-indication ) 3-6
4. OPERATION .............................................................................................. 4-1
4.1 Starting and Stopping ...................................................................................... 4-1
4.1.1 Starting ..............................................................................................4-1
4.1.2 Display at Start-up..............................................................................4-1
4.1.3 Stopping.............................................................................................4-1
4.2 Functions of Master Indicator Components..................................................4-2
4.3 Operational Functions...................................................................................... 4-3
4.3.1 Basic Operation Flowchart.................................................................4-3
4.3.2 Fundamentals of Operation ...............................................................4-5
4.3.3 Switching the display ........................................................................4-6
4.3.4 LOG / GPS Selection.........................................................................4-7
4.3.5 Test Function......................................................................................4-8
4.3.6 Resetting the total distance function..................................................4-8
4.4 Setting function................................................................................................. 4-9
4.4.1 Speed Alarm Setting .........................................................................4-9
ELECTROMAGNETIC LOG
EML 500 Series
User’s Manual
IM80B80T10E 21th Edition

ii
IM80B80T10E 21th Edition : Jul.1,2007-00
4.4.2 GPS Input Selection ..........................................................................4-9
5. MAINTENANCE......................................................................................... 5-1
5.1 Daily Inspection................................................................................................. 5-1
5.2 Periodic Inspection........................................................................................... 5-1
5.3 Troubleshooting ............................................................................................... 5-2
5.4 Replacing the Master Unit Battery .................................................................. 5-5
5.5 Inspection of the Measurement Rod...............................................................5-6
5.6 Inspection of the Seawater Valve....................................................................5-7
5.6.1 Precautions in Replacing the Sensor ................................................5-8
5.6.2 Precautions in Installing the Sensor ..................................................5-8
6. INSTALLATION ......................................................................................... 6-1
6.1 Precautions on Installation.............................................................................. 6-1
6.1.1 Seawater Valve and Measurement Rod ...........................................6-1
6.1.2 Junction Box ......................................................................................6-1
6.1.3 Master Unit.........................................................................................6-1
6.1.4 Indicator ............................................................................................6-1
6.2 Response-speed Setting.................................................................................. 6-2
6.3 Parameter Settings ........................................................................................... 6-3
6.3.1 Master Indicator .................................................................................6-3
6.3.2 Analog Indicator ................................................................................6-3
6.3.3 Master Unit.........................................................................................6-4
6.4 Adjustments ...................................................................................................... 6-6
6.5
Milepost Measurement (Maintenance Mode)............................................................... 6-9
6.5.1 Automatic Milepost measurement...................................................6-10
6.5.2 Manual milepost Measurement ......................................................6-13
6.5.3 Display /Alteration / Deletion of Milepost Data(Maintenance Mode) 6-13
6.5.4
Dsiplay and Alteration of Linearizer Table ( Maintenance Mode )...............6-14
6.6 GPS Interface Setting .....................................................................................6-16
6.7 Switching of Voltage Output Range..............................................................6-18
6.8 Serial Output Signal Format ..........................................................................6-19
6.9 Maintenance Functions..................................................................................6-24
6.9.1
Intermediate ErrorCompensation Factor ( MaintenanceMode )...................................6-24
6.9.2 Sub-maintenance Mode ..................................................................6-24
6.9.3 Switch Status Display Mode (S
ub-maintenance Mode )............................6-25
6.9.4 Voltage Check Mode (Sub-maintenance Mode) .............................6-25
6.9.5 Fixed voltage Output Mode (
Sub-maintenance Mode ) ..........................6-26
6.10
ErrorCodeDisplayMode(Sub-maintenanceMode).................................................................................6-26
Appendix 1: EML 500 Circuit diagram ..............................................................A-1
Appendix 2 : Master Unit Block Diagram .........................................................A-2
Appendix 3: Master Indicator Block Diagram..................................................A-3
Appendix 4: Speed Indicator Block Diagram...................................................A-4

iii
IM80B80T10E 21th Edition : Jul.1,2007-00
Appendix 5 : List of Components......................................................................A-5
Appendix6:InstallationandAdjustmentCerticate ......................................A-8
Appendix 7: Calibration and Measurement Record......................................A-11
Appendix 8: Contrast of digital display and character for Master IndicatorA-12

Blank Page

v
IM80B80T10E 21th Edition : Jul.1,2007-00
FOREWORD
A Brief Word Before Use
Thank you very much for purchasing our EML500 Series Electromagnetic Log.
This instruction manual describes the functions of the Electromagnetic Log and how to use it. Before
using this equipment, please read the manual carefully for correct operation.
Notice
The contents of this manual are subject to change without prior notice.
• If any question arises or errors are found, or if there is any information missing from the
manual, please inform the company or your nearest sales ofce or representative. Their ad-
dresses may be found on the back cover of this manual.
• No part of this manual may be reproduced in any form without our written permission.
Exemption from Responsibility
• YOKOGAWA Denshikiki makes no warranties regarding the product except those stated in
the WARRANTY that is provided separately.
• YOKOGAWA Denshikiki assumes no liability to any party for any loss or damage, direct or
indirect, caused by the user or any unpredictable defect of the product.
Important Cautions
The following symbols concerning safety can be found on the equipment and in this manual:
WARNING
This symbol indicates that the operator must refer to an explanation in the instruction manual in
order to avoid the risk of injury to personnel or death.
CAUTION
This symbol indicates that the operator must refer to an explanation in the instruction manual in
order to prevent damage to the equipment.

vi
IM80B80T10E 21th Edition : Jul.1,2007-00
WARNING
Electrical shock
· To avoid electrical shock, turn off the power before making wiring connections.
Removal of Measurement Rod
· To remove the measurement rod, Pull it all the way up and close the seawater valve.
Then remove the rod.
· If the rod is removed before closing the valve, seawater will spew out through the valve.
· To remove the chain, fully close the valve (for the HS,HV, and FA models).
Then remove the chain.
CAUTION
Do not use a megger for inspection purposes except for on-board power supply terminals.
Otherwise, the equipment may be damaged.
Do not use a megger for sensor inspections. Otherwise, the sensor may be damaged.
Do not drop the measurement rod or allow any mechanical shock at the tip of the rod. Other-
wise, the rod may be damaged.

1-1
IM80B80T10E 21th Edition : Jul.1,2007-00
< 1.INTRODUCTION >
1. INTRODUCTION
This chapter briefly describes the minimum information necessary to operate the EML500 Electro-
magnetic Log. You can use this chapter as a quick-reference manual covering the following
items:
(1) Components on the operation / display panel and their functions
(2) Starting and stopping
(3) Summary of functions
For further details, refer to the subsequent chapters.
1.1 Components and Their Functions
(1) Master indicator
GPS LOG ON OFF
ARARM
LOG/GPS
MAINT
TRIP
TOTAL DIST
TRANS SPD
ARARM
MODE
L T 6 7 8 9 0
CLEAR
1 2 3 4 5 ENT
F1DISPL F2 PREV MODE
EML 500
kt
nm
kt
nm
Speed display Distance display
Numeric keypad
Display select key
(for selecting speed or distance data)
Lamp-test key
Clear key
Enter key
(for entering set values)
Previous operation key
Dimmer keys
(for increasing or decreasing
the intensity of the light)
Mode key
(for changing operation or setting items)
Function keys
(pressed according to the indication
on the bottom line of the display)

1-2
IM80B80T10E 21th Edition : Jul.1,2007-00
< 1.INTRODUCTION >
(2) Master Unit
The operation panel on the master unit is shown below, with its cover removed.
SW2 to SW7 : digital switches
(for maintenance setting)
SW8 : dip switch
(for system and
maintenance setting)
MDS1 : error indication LED unit
FU1 : fuse for the main power
5A for 24V DC
2A for 100 to 220V AC
SW1 : power supply switch
(for supplying power to the
entire system)
SW11 : dip switch
(for switching the current
output)
BT1 : memory backup battery
Power LED
SW9 : dip switch
(for switching the relay
contact; NC or NO)
FU4 : 2A fuse
(for the speed indicator)
FU3 : optional furse of 1A
(for the speed indicator)
WARNING
Electrical shock
To avoid electrical shock, turn off the power before making wiring connections.
CAUTION
Do not use a megger for inspection purposes except for on-board power supply terminals.
Otherwise, the equipment may be damaged.

1-3
IM80B80T10E 21th Edition : Jul.1,2007-00
< 1.INTRODUCTION >
1.2 Starting and Stopping
(1) Starting
Turn on the on-board power supply.
Open the master-unit cover, and turn
on the power supply switch (SW1).
At this time, the sensor must extend into the seawater
by a specied length.
The Power LED
On the master unit comes on.
The master indicator displays the speed and total
distance traveled. The analog speed indicator also
reads the speed.
Normal operating state
(2) Stopping
Complete Stopping
Open the master unit cover, and turn
off the power supply switch.
Turn off the electromagnetic-log
switch on the power distribution
board.
Complete stop
Either switch can be
turned off rst.

1-4
IM80B80T10E 21th Edition : Jul.1,2007-00
< 1.INTRODUCTION >
Partial Stopping (power-off for protecting the sensor)
The Power can be partially turned off if the sensor is replaced or pulled up and kept in the seawater
valve for a while.
Enter ‘0.1’ on the numeric keypad while the speed
and distance are displayed on the master indicator.
Only the lighting of the master indicator display and
the sensor exciting power are turned off.
Press the
DISPL
key on the master indicator to
return to the normal operating state.
Other indicators and the CPU in the master unit are
still operating.

1-5
IM80B80T10E 21th Edition : Jul.1,2007-00
< 1.INTRODUCTION >
1.3 Summary of Functions
Classication Function page
Indication
Master
indicator
LOG
Displays the speed and total distance 4-6
Displays the trip and total distance 4-6
Displays the longitudinal and transverse speeds (dual-
axis sensor system) 4-6
Displays the resultant speed direction of moving ship
(dual-axis sensor system) 4-6
GPS
Displays the speed and total distance (when backed up
by the GPS) 4-6
Speed
indicator
Displays the trip and total distance (when backed up by
the GPS) 4-6
Single-axis Indicator the longitudinal speed by a needle pointing to
the reading 3-6
Dual-axis
Indicates the resultant speed and direction of a moving
ship by a needle pointing to the reading (dual-axis) 3-6
Indicates the longitudinal to transverse speed by a nee-
dle pointing to the reading (dual-axis) 3-6
Setting Master indicator
Test function 4-8
Alarm speed setting 4-9
GPS speed selection 4-9
Error code display mode 6-26
Mainte-
nance Master indicator
Zero adjustment 6-6
Sensitivity adjustment 6-7
Span adjustment 6-8
Response-speed setting 6-2
Milepost 6-9
Display / alteration / deletion of milepost data 6-13
Display / alteration of the linearizer table 6-14
Selection of intermediate error compensation factor 6-24
Switching of the voltage output range 6-18
Setting of the GPS interface 6-16
Selection of sub-maintenance mode 6-24
Switch status display mode 6-25
Voltage check mode 6-25
Fixed voltage output mode 6-26

Blank Page

2-1
IM80B80T10E 21th Edition : Jul.1,2007-00
< 2.OVERVIEW >
2. OVERVIEW
2.1 General
The EML 500 series of electromagnetic logs successfully meets the performance requirements
prescribed by IMO resolutionA478 (XII), and has been approved by the Ministry of Land,Infrastructure
and Transport Japan (approval no.:3795).
The EML500 features:
(1) Versatile external interfaces
· Pulse output (photocoupler / contact)
· Digital output (NMEA0183)
· Analog speed output (0V DC to 5V DC)
· Alarm contact and interface with the GPS
(2) High reliability
The use of highly integrated circuits, such as microprocessors, provides excellent reliability due to
a reduction in parts and the elimination of moving parts.
(3) Master indicator for displaying the speed and distance
(4) Variety of sensors available to meet various installation requirements.
A dual-axis sensor can measure not only the longitudinal speed, but also the transverse speed.
(5) Built-in self-diagnostic function
2.2 Principle
The principle of electromagnetic logs is based on Faraday’s law of electromagnetic induction.
An electromotive force is induced in a conductor whenever there is relative motion between the
conductor and magnetic field.
The directions of the magnetic field, motion and induced emf are at right angles or perpendicular to
each other.
If the magnetic field is fixed, the magnitude of the induced emf is proportional to the speed of the
motion (see Figure ”Principle”).
Therefore, either the conductor or magnetic field must move to induce an electromotive force.
In the case of electromagnetic logs, the magnetic field moves along with the ship while the seawa-
ter (the conductor) remains stationary.
There is a coil in the sensor at the top of the measurement rod, and this coil is energized to establish
a magnetic field around the sensor. As the ship moves, an emf is induced which is then detected
by a pair of electrodes at the tip of the sensor (see Figure “Flattened Sensor Structure”).

2-2
IM80B80T10E 21th Edition : Jul.1,2007-00
< 2.OVERVIEW >
Magnetic flux
Electromotive
force
Direction of
induced emf
Direction of
magnetic field lines
Direction of motion
Figure Principle
Exciting current
Induced voltage
Iron core
Coil
Rod
Electrodes
Direction of moving ship
Magnetic flux
Figure Flattened Sensor Structure
Here an induced emf can be obtained from the for-
mula below.
e = B·V·D·10-4 Volt
where
B = Flux density (Tesla)
V = Speed (cm/s)
D = Distance between electrodes (cm)
2.3 PerformanceandSpecications
(1) Power supply
Power supply voltage: 100 / 110 / 115 V AC ±10 % (50 / 60 Hz ±6 %)
200 / 220 V AC ±10 % (50 /60 Hz ±6 %)
(can be selected by changing the jumper setting in the power supply unit.)
Power consumption: 80 VA
Insulation resistance: at least 10MΩ using 500V megger (excluding electronic circuits)
Withstanding voltage: 1500 V AC for 1 min (excluding electronic circuits)
(2) Measuring Range
Speed:
(*1: Additional engineering is
required concerning the in-
stallation of the sensor.)
-4 kt to 20 kt.
-5kt to 25 kt.
-8 kt to 40 kt.
-7 kt to 35 kt.
-10 kt to 50 kt. (*1)
-13 kt to 65 kt. (*1)
Transverse speed: 0 kt to ± 6.5 kt.
Distance: 0 nm to 9999.99 nm
Direction of ship movement: 0 to 359 deg., clockwise from the bow-to-stern line
(xed to 0 deg if the resultant speed is 0.5 kt or less)
(3) Measuring Accuracy
Speed: ± 0.15 kt. with respect to standard signal inputs
(± 0.25 kt. or less if the measuring range is above 40 kt.)
Distance: ± 0.05 nm/h or ± 1.0% max., whichever is larger
Direction of ship movement: deg max = ±2.5 deg

2-3
IM80B80T10E 21th Edition : Jul.1,2007-00
< 2.OVERVIEW >
(4) Response Speed
Variable up to 2 min for a 0 to FS-step input (0% to 90% response)
(5) Milepost Adjustment
Break point of linearize : in 5 kt. increments
Sensitivity (span) adjustment range : ×1.8 to × 0.6 (specied in 0.1 increments)
(6) External Output Signal Accuracy
Analog signal (voltage / current ): 0.2 % max. of the full span
Distance pulse: same as the measuring accuracy
Speed limit detection: same as the measuring accuracy
(7) Output Signals
analog speed output : 6 circuits
(i) Voltage output Number of
circuits :
2
Output level: Either 0 V to 5V or 1 V to 5V can be selected.
One output type can be selected from the following four types.
Procedure of selection vide 6.3.3.
(a)
5V
+Full
0 kt
Output voltage
Ship’s speed
5V
0
1V
+Full- Full kt
Output voltage
Ship’s speed
(b)
5V
+Full- Full kt
0
Output voltage
Ship’s speed
5V
1V
0+Full- Full kt
Output voltage
Ship’s speed
Output
circuit :
Non - isolating method
Load resistance of kΩ max = 5 kΩ
+
+
-
-
SHLD
FG
µPC451

2-4
IM80B80T10E 21th Edition : Jul.1,2007-00
< 2.OVERVIEW >
(ii) Current output Number of
circuits :
4
Output level: Either 0 mA to 20mA or 4 mA to 20 mA can to be selected.
One output type can be selected from the following four types.
Procedure of selection vide 6.3.3.
(a)
20mA
+Full
0 kt
Output current
Ship’s speed
20mA
0
4mA
+Full- Full kt
Output current
Ship’s speed
(b)
20mA
+Full- Full kt
0
Output current
Ship’s speed
20mA
4mA
0+Full- Full kt
Output current
Ship’s speed
Output
circuit :
Non - isolating method
Load resistance of Ω max = 250 Ω
+
+
-
-
2SC1815
250 Ω
+15 V
Distance pulse output : 10 circuits
(i) Photocoupler output Number of circuits: 8
Output capacity: voltage between terminals .....V max = 24 V
Sink current ..... mA max = 5 mA
Dark current ..... µA max = 50 µA(at 24V between termi-
nals).
Output circuit :
TLP621-4
Pulse weight : 200 pulses / nm (fixed)
(ii) Relay output Number of circuits : 2
Contact capacity : rated load (resistance load) ..... 30 V DC; 1 A
30 V AC; 0.5 A
Minimum applicable load ..... 10 mV DC; 10µA
Chattering ..... ms max = 1 ms
Pulse weight: 200 pulses / nm (fixed)

2-5
IM80B80T10E 21th Edition : Jul.1,2007-00
< 2.OVERVIEW >
Output -pulse
characteristics :
Ton
T
Ton : 100 ±1.25 ms (fixed)
T : Varies depending on the ship’s speed
At Ton : Photocoupler
output
Continuity between terminals
Relay output “Open” or “Close” contact (normally “Open”)
Can be specied by setting dip switch SW9-1
(off : closed; on : open)
digital speed output : 2 circuits (as per NMEA0183)
Output circuit
P
N
SHLD
AM26LS31
Conforms to EIA RS422A
Output current at H level : -20 mA
Output current at L level : 20 mA
Alarm contact : 4 circuit
(i)
State of contact Setting alarm speed
(master indicator)
Dip SW9-2
(master unit)
‘close’ in the Speed limit Hi ON Standard
Lo OFF
‘Open’ in the Speed limit Hi OFF
Lo ON
(Note) For setting Hi and Lo, refer to 4.4.1
(ii)
State of contact Setting of JP1,2
‘Close’ at the occurrence of on error short between
2 and 3
  3
  2
  1
‘Open’ at the occurrence of on error short between
1 and 2
  3
  2
  1
(Note) Fix dip switch 9 to OFF
Error detection A/D converter error
Communication errors · GPS input error
· Communication error between the master unit and master
indicator
Excess of the speed sensor input range

2-6
IM80B80T10E 21th Edition : Jul.1,2007-00
< 2.OVERVIEW >
(8) Input Signal: 1 circuit (for back up by GPS)
Digital signal
Input circuit: Isolated by photocoupler
510Ω
P
N
2SK117
1S955
TLP553
(9) Ambient Conditions
Temperature: -15°C to +55 °C (when operating)
-20 °C to +60 °C (when not operating)
Humidity : up to 95 % RH (no condensation)
Vibration : 5 Hz to 12.5 Hz ..... ±1.6 mm
12.5 Hz to 25 Hz ..... ± 0.38 mm
25 Hz to 50 Hz ..... ± 0.1 mm
Waterproong : IP 22
Junction box ..... IP 55
Sensor unit ..... 0.5 MPa for submerged section and IP 55 for the upper section
Power line noise : There must be no noise when a pulse of 100 / 400 nsec and 1500 V is applied for three
minutes.
Insulation resistance : at least 10MΩ, using a 500 V megger (excluding the sensor and electronic circuits)
Withstanding voltage : 1500 V AC, for 1 minute (excluding the sensor and electronic circuits)
2.4 Handling Precautions
(1) If there are contaminants or microorganisms adhering to bottom of the ship or the tip of the
measurement rod (electrodes), the indicated speed may be lower than the actual speed. The
bottom of the ship should always be kept clean. For cleaning and inspection, refer to Section
5.2 in Chapter 5.
(2) When closing the seawater valve, rst pull up the measurement rod as far as the attached
chain allows.
(3) If the ship is at anchor, pull the measurement rod all the way up and close the seawater
valve.
(4) If the ship will remain in port for a log time, remove the chain and keep the measurement rod
on board.
(5) The “FWD” marking on the measurement rod must face in the direction of the bow.
Otherwise, the detected speeds will be lower than the actual ones.
(6) The tip of the measurement rod is fragile. Handle it very carefully.
(7) Even when the ship is at anchor, a slight speed may be indicated if the water is owing past.

3-1
IM80B80T10E 21th Edition : Jul.1,2007-00
< 3.COMPONENTS >
3. Components
3.1 SystemConguration
EML500
EML500
EML500
10
15
20
5
0knots
10
15
20
5
0
knots
10
15
20
5
0
knots
10
15
20
5
0knots
SPEED
17.5kt
T.MILES
12345.56nm
LR525-F
Flush-mount unit
LR523-D
Flush-mount unit
LR523-W
Desktop/wall-mount unit
LR523-F
Flush-mount unit
(with bezel)
LR525-W
Wall-mount unit
LR524-F
Flush-mount unit
LT501-F
Flush-mount unit
LD001A-F
Flush-mount unit
LD001A-W
Wall-mount unit
LT501-W
Wall-mount unit
LR524-W
Wall-mount unit
Master indicator
Speed indicator (dual axis) Speed indicator (Single axis)
Master unit
Dimmer box
GPS
(Optional)
Contact signal(2p max)
Photocoupler (8P max)
Analog speed output (2p max)
Power or system failure (4P max)
Speed limit (2P max)
Analog speed output (4P max)
Speed and distance data output (2P max)
100 to 230 V AC power supply
200P/nm
200P/nm
1V DC to 5V DC
Alarm contact
Alarm contact
4mA to 20mA
Digital signal
(NMEA0183)
ø35 F
For double-bottom hull ø70 F
LV071A/LS571
ø48 F
LV052/LS541(single axis)
LS542 (dual axis)
LV033/LS591
ø35 F
For single-bottom hull
LV033/LS531
100 V AC to 230 V AC
Used for flush-mount speed
indicator or external dimmer
(in case of EL lighting)
Digital signal
(NMEA0183)
MHR120
Universal Data Display
MHR112
Assist Monitor
MHR110A
Universal Data Display
LN052
Junction
box
(Optional)
Seawater valve / Sensor