Seatex HMS 100 User's Manual

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Seatex HMS 100User's Manual

Issued: 2003-09-09


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Notice

! All rights reserved. Reproduction of any of this manual in any form whatsoever without prior written permission from Kongsberg Seatex AS is forbidden.

! The contents of this manual is subject to change without notice.

! All efforts have been made to ensure the accuracy of the contents of this manual.However, should any errors be detected, Kongsberg Seatex AS would greatly appreciate being informed of them.

! The above notwithstanding, Kongsberg Seatex AS can assume no responsibility for anyerrors in this manual or their consequences.

Copyright" 2003 by Kongsberg Seatex AS. All rights reserved.

Kongsberg Seatex ASPirsenteret, N-7462 Trondheim, Norway

Telephone: +47 73 54 55 00Facsimile: +47 73 51 50 20

Duty phone: +47 73 50 21 11E-mail: [email protected]

www.kongsberg-seatex.no


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Revision log

Document ID Rev. Date Reason for revision Approved(sign)

33300-GM-001 0 1999-03-17 First version of the renewed manual FOS1 1999-07-07 Updated according to version 2.0.4

of the softwareFOS

2 1999-11-16 Updated to correspond with MRU3.00 software version and changes todescription of lever arm in HMS sw.

FOS

3 1999-12-30 Updated to include the new HW- platform

FOS

4 2000-03-30 Updated according to version 2.0.7of the software with Helideck Report

FOS

5 2000-05-11 Minor corrections FOS6 2001-03-13 Updated to correspond with HWP-

2000 version of the Processing Unitand to include description of light panels

FOS

7 2002-01-03 Updated according to version 2.0.10

of the software with Helideck Report

FOS

8 2002-08-28 Maintenance and parts list chapter updated

FOS

9 2003-09-09 Updated VDU data and moreinformation on meteorologicalsensors

FOS

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Table of contents

1. INTRODUCTION............................................................................................................. 11.1 About this manual...................................................................................................... 11.2 References.................................................................................................................. 21.3 Definitions, abbreviations and acronyms .................................................................. 2

1.3.1 Definitions ..................................................................................................... 21.3.2 Abbreviations and acronyms ......................................................................... 3

2. TECHNICAL DATA ........................................................................................................ 52.1 Health, environment and safety ................................................................................. 52.2 Restrictions in guarantee ........................................................................................... 5

2.3 Performance data ....................................................................................................... 52.4 Restrictions in use...................................................................................................... 62.5 Physical dimensions................................................................................................... 62.6 Power ......................................................................................................................... 82.7 Environmental specification...................................................................................... 82.8 Other data................................................................................................................... 9

3. INSTALLATION............................................................................................................ 113.1 Mechanical and electrical installation ..................................................................... 113.2 HMS software installation....................................................................................... 11

3.3 HMS software configuration ................................................................................... 123.3.1 Initial system check ..................................................................................... 133.3.2 System files.................................................................................................. 14

4. TECHNICAL DESCRIPTION...................................................................................... 154.1 Introduction ............................................................................................................. 154.2 Design principles ..................................................................................................... 15

4.2.1 Interface protocols ....................................................................................... 164.2.2 Transfer methods ......................................................................................... 17

4.2.2.1 Serial line....................................................................................... 17

4.2.2.2 Analog signals ............................................................................... 174.2.3 Roll and pitch determination........................................................................ 174.2.4 Heave position and velocity computation.................................................... 17

4.3 System components ................................................................................................. 184.3.1 Processing unit............................................................................................. 194.3.2 MRU H......................................................................................................... 214.3.3 The Video Display Unit ............................................................................... 234.3.4 Meteorological sensors ................................................................................ 234.3.5 Light panel ................................................................................................... 23

5. OPERATING INSTRUCTIONS ................................................................................... 255.1 Start-up procedure ................................................................................................... 25


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5.2 Operation ................................................................................................................. 265.2.1 Adjusting presentation window ................................................................... 275.2.2 Selection of landing limits ........................................................................... 285.2.3 The File menu.............................................................................................. 29

5.2.3.1 Print and print setup....................................................................... 305.2.3.2 Exit Helideck Monitoring.............................................................. 30

5.2.4 The Run menu.............................................................................................. 315.2.4.1 Helideck Monitor start-up ............................................................. 315.2.4.2 Helideck Monitor logging ............................................................. 31

5.2.5 The Config menu ......................................................................................... 325.2.5.1 Password protection....................................................................... 325.2.5.2 Communication setup.................................................................... 325.2.5.3 Settings .......................................................................................... 345.2.5.4 Operational limits .......................................................................... 37

5.2.6 The Window menu....................................................................................... 445.2.6.1 Arrange .......................................................................................... 455.2.6.2 Motion meters................................................................................ 455.2.6.3 Wind meters................................................................................... 465.2.6.4 Climate meters ............................................................................... 485.2.6.5 Motion history graphs.................................................................... 485.2.6.6 Wind history graphs....................................................................... 495.2.6.7 Climate history graphs................................................................... 505.2.6.8 Helideck reports............................................................................. 505.2.6.9 UK sector (CAP 437)..................................................................... 515.2.6.10 Norwegian sector........................................................................... 515.2.6.11 Average heave rate ........................................................................ 525.2.6.12 Calm periods.................................................................................. 525.2.6.13 Light control .................................................................................. 525.2.6.14 Statistics......................................................................................... 535.2.6.15 Motion............................................................................................ 535.2.6.16 HeaveOfs ....................................................................................... 535.2.6.17 Light............................................................................................... 545.2.6.18 Communication details .................................................................. 54

5.2.7 Help - About ................................................................................................ 555.3 Stop procedure......................................................................................................... 555.4 Performance monitoring.......................................................................................... 56

6. MAINTENANCE ............................................................................................................ 576.1 General..................................................................................................................... 576.2 Preservation ............................................................................................................. 576.3 Periodic maintenance............................................................................................... 57

6.3.1 Software upgrades........................................................................................ 576.3.2 Cleaning of air inlet ..................................................................................... 586.3.3 Recalibration of the meteorological sensors................................................ 586.3.4 Cleaning of light panel................................................................................. 586.3.5 Recalibration of the MRU............................................................................ 58


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6.3.6 Changing the internal lithium battery.......................................................... 596.4 Repairs and modifications ....................................................................................... 59

6.4.1 Repair of the Processing Unit ...................................................................... 596.4.2 Repair of the MRU....................................................................................... 59

6.4.2.1 Installing a spare MRU.................................................................. 596.4.3 Repair of the MRU Junction Box ................................................................ 60

6.5 Troubleshooting....................................................................................................... 606.5.1 No response after power-on......................................................................... 616.5.2 Wind sensor indication is "Red".................................................................. 616.5.3 Light panel indication is "Red".................................................................... 626.5.4 MRU sensor indication is "Red".................................................................. 626.5.5 MRU sensor indication is "Yellow" ............................................................ 636.5.6 Problems with the MRU .............................................................................. 64

6.5.6.1 No contact with the MRU.............................................................. 646.5.6.2 MRU status: Abnormal.................................................................. 646.5.6.3 MRU status: Unknown .................................................................. 65

6.5.7 Reduced roll or pitch performance .............................................................. 666.5.8 Reduced heave performance........................................................................ 666.5.9 Heave velocity value is 1.0.......................................................................... 666.5.10 Seapath indicator is "Red" ........................................................................... 676.5.11 No or incorrect absolute wind indication..................................................... 67

7. DRAWINGS .................................................................................................................... 69

8. PARTS LIST.................................................................................................................... 719. APPENDIX A - SETUP FOR TEST OF THE MRU................................................... 73

10. APPENDIX B - NMEA INPUT PROTOCOLS ........................................................... 7710.1 Wind speed and direction data................................................................................. 7710.2 Pressure, temperature and humidity data................................................................. 7710.3 Heading data ............................................................................................................ 7810.4 Position and speed data............................................................................................ 7910.5 Time sync data......................................................................................................... 8010.6 Motion data.............................................................................................................. 80

11. APPENDIX C - HELIDECK REPORT CALCULATIONS....................................... 81

12. APPENDIX D - LANDING LIGHT INDICATOR...................................................... 83

13. APPENDIX E - LOG FILE FORMAT ......................................................................... 85

Index ........................................................................................................................................ 87

Reader's comments ................................................................................................................ 89


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List of illustrationsFigure 1 The Helideck Monitor display......................................................................................11Figure 2 The Communication Setup dialogue box for sensor configuration .............................. 12Figure 3 The password dialogue box ..........................................................................................13Figure 4 The Communication Details for checking the sensor data ...........................................13Figure 5 The HMS 100 main window in Run mode...................................................................14Figure 6 The system components................................................................................................19Figure 7 Front panel of the Processing Unit ............................................................................... 20Figure 8 Rear panel of the Processing Unit with connectors...................................................... 20Figure 9 MRU H functional modules..........................................................................................21Figure 10 Mechanical layout of MRU (MRU H does not include shown fluxgate compass) .... 22Figure 11 The default user interface screen in HMS 100 ........................................................... 25Figure 12 The HMS 100 main window....................................................................................... 26Figure 13 A user modified HMS window...................................................................................28Figure 14 The landing light display with selection of available landing limitations..................28Figure 15 Light details ................................................................................................................29Figure 16 The File menu .............................................................................................................29Figure 17 The Print Setup menu ................................................................................................. 30Figure 18 The exit confirmation dialogue box............................................................................30Figure 19 The Run menu.............................................................................................................31Figure 20 The Config menu ........................................................................................................32Figure 21 The password authorisation dialogue box ..................................................................32Figure 22 The Communication Setup dialogue box.................................................................... 33Figure 23 The display setting window no. 1 ............................................................................... 34Figure 24 The display setting window no. 2 ............................................................................... 34Figure 25 The Logging setup dialogue box ................................................................................ 35Figure 26 The lever arms setup dialogue box ............................................................................. 35Figure 27 The CG arm vector to TP and SP as defined in the HMS software............................ 36Figure 28 Lists available operation limits...................................................................................37Figure 29 The dialogue box for configuring motion limits.........................................................38Figure 30 Wind limitations for the Lynx helicopter during day flights......................................40Figure 31 Operation limits in the Norwegian sector...................................................................43Figure 32 Selection of operation limit ........................................................................................44Figure 33 The Window menu......................................................................................................44Figure 34 Arrange windows commands...................................................................................... 45Figure 35 The meter window for roll ..........................................................................................45Figure 36 The wind meter for wind direction ............................................................................. 46Figure 37 The extra wind display................................................................................................ 47Figure 38 Absolute wind direction and speed meter................................................................... 47Figure 39 The climate meter for air temperature ........................................................................ 48Figure 40 Motion history graph window for the roll variable .................................................... 49Figure 41 Wind history graph window for the wind direction variable......................................49Figure 42 Climate history graph window for the air temperature variable................................. 50Figure 43 Shows the different helideck reports selections.......................................................... 50


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Figure 44 Ship motion presented according to UK CAP 437 recommendations, type extendedreport ........................................................................................................................... 51

Figure 45 Helideck motions presented according to recommendations on NorwegianContinental Shelf.........................................................................................................51

Figure 46 The average heave rate figure shown as a trend graph...............................................52Figure 47 Calm periods shown as a trend graph ......................................................................... 52Figure 48 Light Control window................................................................................................. 52Figure 49 Shows the different statistics selections available...................................................... 53Figure 50 Statistics for the selected time window ......................................................................53Figure 51 Heave offset values calculated to make heave measurement independent of roll and

pitch of vessel.............................................................................................................. 54Figure 52 Performance statistics of the light panel.....................................................................54Figure 53 The serial communication details ............................................................................... 54Figure 54 The About Helideck Monitor dialogue box................................................................55Figure 55 The status indication in the HMS 100 screen ............................................................. 61Figure 56 Notification of reduced quality of MRU data............................................................63Figure 57 Maximum peak to peak value in one cycle.................................................................81

List of tables

Table 1 Interface protocols..........................................................................................................16

Table 2 Main window controls ................................................................................................... 27Table 3 Limits on the ship motion dependent on relative wind speed........................................40Table 4 Default window controls for the wind meters................................................................46Table 5 Default window controls for the climate meters............................................................ 48


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Seatex HMS 100 User's Manual, rev. 9 Introduction

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1. INTRODUCTION

1.1 About this manual

The purpose of this manual is to provide the user with sufficient information to performcorrect installation, operation and maintenance of the HMS 100 product.

This manual is organised into the following chapters:

Chapter 1 Introduction - A brief overview of this manual with references andabbreviations.

Chapter 2 Technical Data - Presents detailed product specifications, physical dimensions,required power, environment restrictions, together with restrictions in use andguarantee.

Chapter 3 Installation - Describes the installation and configuration of the Helideck Monitor software. The mechanical and electrical installation refers to the

Installation Manual .

Chapter 4 Technical Description - A brief description of the design principles of the HMS100 and the components included in the product.

Chapter 5 Operation Instructions - Describes system operation following installation andthe capabilities of the Helideck Monitor software.

Chapter 6 Maintenance - Describes repair and servicing procedures including atroubleshooting section.

Chapter 7 Drawings - Refers to the Installation Manual .

Chapter 8 Parts List - Lists the parts in the basic delivery and available optional equipment.

The following notations are used in this manual:

Is used to make the user aware of procedures and operational practice which, if not followed, may result in degraded performance or damage to the equipment.

Note A note text has this format and is used to draw the user's attention to specialfeatures or behaviour of the equipment.

CAUTION


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1.2 References

[1] 33300-GM-002, Installation Manual, HMS 100[2] WindObserver II Ultrasonic Anemometer, User Manual [3] Data Sheet,OMC-442/443 Temperature Sensor [4] Setra Model 470, Digital Pressure Sensor [5] NMEA 0183 Standard for Interfacing Marine Electronic Devices V 2.00[6] 38120-GM-002,Seapath 200 Installation Manual [7] General Conditions for the Supply of Products , Orgalime S 92 with one exception

sheet

1.3 Definitions, abbreviations and acronyms

1.3.1 Definitions

alignment Is the process of adjusting the current internal navigationframe (g, h or b-frame) in the instrument to the true externalframe.

attitude The orientation relative to the vertical axis of a vehicle.Heading is not included. If heading is included the wordorientation for the vehicle is used.

heave The vertical dynamic motion of a vehicle and defined positive down. Heave position and velocity are dynamicmotion variables calculated for a selected average heave period.

pitch A rotation about the pitch axis is positive when the bowmoves up. Normally, pitch means the dynamic pitch anglemotions.

roll A rotation about the roll axis is positive when starboard sideof the vehicle moves down. Normally, roll means thedynamic roll angle motion.

starboard When looking in the bow direction of a vehicle, this is theright hand side of the vehicle.

yaw A rotation about the vertical axis is positive when turningEastward (Clockwise) when the vehicle cruises in Northdirection. Normally, yaw means the dynamic yaw motion.


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1.3.2 Abbreviations and acronyms

A/D Analog to digital signal converting.b-frame Body frame. An orthogonal frame fixed to the MRU housing or to the

vehicle where the MRU is fixed.CAP 437 Guidance on criteria required by the UK Civil Aviation Authority regarding

helicopter offshore landing areas.CG Centre of gravity. The mass centre of a vessel. This is normally the location

with least linear acceleration, and hence the best location for measurementsof roll and pitch.

HMS Helideck Monitoring System.MP Measurement Point.MRC Special software delivered with all MRU units. Running on a PC under MS-

DOS. With this software the user can set up the MRU according to hisapplication by use of the delivered configuration cable. The MRC softwareis used to change the configuration parameters, to check the internal status,etc.

MRU Motion Reference Unit. This is the inertial sensor within the HMSmeasuring dynamic linear motion and attitude.

NMEA National Marine Electronics Association. NMEA 0183 is a standard for interchange of information between navigation equipment.

NVG Night Vision Goggles. Special blue light mode for the HMS light panel.PSIU Power supply and converting unit for the wind speed and direction sensor.

The same as a PCI unit.

QNH Air pressure at mean sea levelRMS Root Mean Square.SCC Seapath Control Centre is a special software used to set configuration

parameters in Seapath. The software runs under Microsoft Windows version3.1 or compatible on a PC.

Y-axis This axis is fixed in the vehicle and points in the downward direction whenthe vehicle is aligned horizontally. Positive rotation about this axis isturning the bow of the vehicle to starboard.


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2. TECHNICAL DATA

2.1 Health, environment and safety

Operation or troubleshooting of HMS equipment will not imply any risk for high voltages,explosions or exposure to gas. The HMS 100 complies with IEC 950/EN60950 standardsregarding product safety (low voltage) and IEC 945/EN60945 standards on electromagneticcompatibility (immunity/radiation) and vibration.

2.2 Restrictions in guarantee

The liability of Seatex is limited to repair of the HMS 100 only under the terms andconditions stated in reference [7], and excludes consequential damages such as customer'sloss of profit or damage to other systems traceable to HMS malfunction. The warranty doesnot cover malfunctions of the HMS resulting from the following conditions:

a) The MRU H is not shipped in the original transport box.

b) The MRU H has been exposed to extreme shock and vibrations.

c) The MRU H housing has been opened by the customer in an attempt to carry out repair work.

d) Over-voltage or incorrect power connection.

2.3 Performance data

The MRU (model MRU H)Resolution in all axes: .......................................................................................................


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Direction resolution:..................................................................................................................1#

Air Temperature Sensor (model OMC-443, optional)Measurement range: ................................................................................................ -30 to +70#CAccuracy: ............................................................................................................................ 0.3#C

Barometric Pressure Sensor (model Setra 470, optional)Pressure range: ....................................................................................... 600 to 1100 hPa (mbar)Accuracy: ............................................................................................................$ 0.02% at 21#C

Light Panel (part no. M410-60, optional)Light intensity rating: ................................................................................................. 4500 cd/m2

Z view:........................................................................................................... 100# (-70# to +30#)Y view: ..................................................................................................................................180#

2.4 Restrictions in use

The HMS 100 is designed for use on board marine surface operated vessels with linear acceleration less than$ 30 m/s2 ($ 3g) and an angular rate range less than$ 150#/s.

Only relative dynamic heave position is calculated and the measurements are limited by theselection of their motion periods available in the range 1 to 25 seconds.

The HMS 100 product is designed as a landing aid only and is not to be used as alanding guide in helicopter operations.

2.5 Physical dimensions

Processing UnitWidth:...................................................................................................... 482 mm (19-inch rack)Height:....................................................................................................................132 mm (3 U)Depth: .............................................................................................................................. 430 mmWeight: ................................................................................................................................ 12 kgColour:.........................................................................................................Front anodised black

Video Display Unit, 15" LCD (Philips 150S4FB)Width:.............................................................................................................................. 343 mmHeight:............................................................................................................................. 310 mmDepth: .............................................................................................................................. 170 mmWeight: ............................................................................................................................... 3.7 kgColour:.................................................................................................................................Black

DISCLAIMER


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MRUHeight:............................................................................................................................. 204 mmDiameter:......................................................................................................................... 105 mmWeight: ............................................................................................................................... 2.5 kgColour:...................................................................................................................................Blue

MRU Mounting Bracket, MRU-M-MB3Length: ............................................................................................................................ 265 mmWidth:.............................................................................................................................. 119 mmHeight:............................................................................................................................. 119 mmWeight: ............................................................................................................................... 1.6 kgColour:.................................................................................................................................Black Material: .......................................................................................................................... POM-H

MRU Junction Box, MRU-E-JB1Length: ............................................................................................................................ 226 mmWidth:.............................................................................................................................. 126 mmHeight:............................................................................................................................... 90 mmWeight: ............................................................................................................................... 2.0 kgColour:.................................................................................................................................Black

Wind Sensor (model WindObserver II, optional)Height:............................................................................................................................. 381 mmDiameter:......................................................................................................................... 213 mmWeight: ............................................................................................................................... 2.0 kg

Colour:.................................................................................................................................. GreyAir Temperature Sensor (model OMC-443, optional)Height:............................................................................................................................. 270 mmDiameter:......................................................................................................................... 120 mmWeight: ............................................................................................................................... 0.7 kgColour:.................................................................................................................................White

Barometric Pressure Sensor (model Setra 470, optional)Width:.............................................................................................................................. 172 mmHeight:............................................................................................................................... 89 mm

Depth: .............................................................................................................................. 102 mmColour:.................................................................................................................................Black

Light Panel (part no. M410-60, optional)Width:.............................................................................................................................. 600 mmHeight:............................................................................................................................. 600 mmDepth: .............................................................................................................................. 175 mmWeight: ............................................................................................................................. 19.5 kgColour:................................................................................................RAL 9005 Pale-blackened


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2.6 Power

Processing UnitVoltage: ......................................................................................85 to 135 and 180 to 265 V ACPower consumption:...............................................................................................100 W (max.)Batteries: ......................................................................None, connection to UPS recommended

Video Display Unit, 15" LCD (Philips 150S4FB)Voltage: ........................................................................................... 100 to 240V AC (50/60 Hz)Power consumption:..............................................................................................23 W (typical)

Wind Sensor (model WindObserver II, optional)Voltage (anemometer only):.....................................................................................9 to 30 VDCPower consumption (anemometer only): ...............................................................60 mA (max.)

Voltage for separate heading module:....................................................................22 to 30 VDCPower consumption for separate heading module: ................................................................ 3 A

Air Temperature Sensor (model OMC-443, optional)Voltage: ....................................................................................................................9 to 36 VDCPower consumption:................................................................................................... 4 to 10 mA

Barometric Pressure Sensor (model Setra 470, optional)Voltage: .................................................................................................................... 5 VDC ±1%Power consumption: ................................................................................................70 mA (max)

Light Panel (part no. M410-60, optional)Voltage: ..................................................................................................................12 to 36 VDCPower consumption without heating:..........................................................................5 A (max.)Power consumption with heating: .............................................................................10 A (max.)

2.7 Environmental specification

Processing UnitEnclosure material:.....................................................................................................AluminiumEnclosure protection: .......................................................................................................... IP-30Operating temperature range:......................................................................................0 to +55ºCOperating humidity (max.):........................................................................ 95% non-condensingStorage temperature range: ......................................................................................-20 to +60ºCStorage humidity: ..................................................................................................Less than 55%Vibration testing according to: .....................................................................................EN 60945

Video Display Unit, 15" LCD (Philips 150S4FB)Operating temperature range:......................................................................................5 to +40ºCRelative humidity: ........................................................................................................20 to 80%


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MRUEnclosure material:......................................................................................Anodised aluminiumEnclosure protection: .......................................................................................................... IP-66Operating temperature range:.....................................................................................-5 to +55ºCOperating humidity (max.):................................................................................................. 100%Storage temperature range: ......................................................................................-20 to +70ºCStorage humidity: ................................................................................................................100%Max. allowed vibration operational (10-2000 Hz continuous):...................................... 0.5 m/s2Max. allowed vibration non operational (0-2000 Hz continuous):.................................. 20 m/s2Max. shock non-operational (10 ms peak):.................................................................. 1000 m/s2

MRU Junction Box, MRU-E-JB1Material: .....................................................................................................................AluminiumEnclosure protection: .......................................................................................................... IP-65

Wind Sensor (model WindObserver II, optional)Enclosure material:.................................................................................................Stainless steelEnclosure protection (mounted upright): ............................................................................ IP-66Operating temperature range (heated version):........................................................-55 to +70ºCStorage temperature range: ......................................................................................-55 to +75ºCStorage humidity: ............................................................................................... 5% to 100% RH

Barometric Pressure Sensor (model Setra 470, optional)Operating temperature range:......................................................................................0 to +45ºC

Light Panel (part no. M410-60, optional)Enclosure material:.................................................................................................Stainless steelEnclosure protection: .......................................................................................................... IP-65Operating temperature range:...................................................................................-30 to +45ºC

2.8 Other data

Data I/OData inputs: ...........................................Up to six RS-232 serial lines and one analog input line

Optional external gyrocompass:.....................................................NMEA 0183 HDT and HDGOptional external wind sensor:................................................... NMEA 0183 MWV and MWDOptional external temperature sensor: ...................................................NMEA 0183 XDR(,,,C)Optional external humidity sensor: ........................................................NMEA 0183 XDR(,,,H)Optional external pressure sensor: ......................................................... NMEA 0183 XDR(,,,P)Optional external time and date signal:.......................................................... NMEA 0183 ZDAOptional external position signal: ........................................NMEA 0183 GGA, GLL and RMCOptional external speed signal: ...................................................................... NMEA 0183 VTG

Other DataLifetime of the lithium battery within the MRU:..........................................................>10 yearsMTBF:............................................................................................................................. 18500 h


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Seatex HMS 100 User's Manual, rev. 9 Installation

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3. INSTALLATION

3.1 Mechanical and electrical installation

For description of the mechanical and electrical installation of the HMS 100, together withdescription of set-up and configuration of the MRU, please see the Installation Manual ,reference [1].

3.2 HMS software installation

The Processing Unit is supplied with the Helideck Monitor software and Windows NT

already installed, and a spare copy of the software is also provided. The Helideck Monitor software runs under Windows NT.

If the HMS software for some reason is not installed, proceed after the following procedure toinstall this software:

1. Power up the HMS, if not already running, by pushing the switch on the lower part of thefront panel. If the HMS software is already installed on your Processing Unit, the Helideck Monitor display shown below will automatically appear on the screen. If not, find theHMS software diskettes delivered with the product and install the software. Insert disketteno. 1 in the Processing Unit diskette drive and follow the instructions on the screen.

Figure 1 The Helideck Monitor display


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2. From theStart menu selectSettings . Then selectControl Panel and Add/removeprogram . Press Browse to find the file "Setup.exe" on A:. Answer the questions on thescreen to complete the installation.

3. Start up the HMS software by selectingProgram from theStart menu and then theSeatexsoftware under Helideck Monitor .

3.3 HMS software configuration

The following procedure is used to configure the Helideck Monitor software according to theInstallation Worksheet filled in during the mechanical and electrical installation (see theappendix "Installation Worksheet" in the Installation Manual , reference [1]):

1. Start the Helideck Monitor and enter theConfig menu and choose theCommunicationoption. Enter the communication set-up for the various sensors according to the completedInstallation Worksheet.

Figure 2 The Communication Setup dialogue box for sensor configuration

2. The Config menu items are protected by a simple password:HMS (Note: Capital letters).Its purpose is not to be secret, but to prevent inadvertent changes caused by unqualified people. The password dialogue, shown below, will appear when the user tries to modifysetup.


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Figure 3 The password dialogue box

3. From theWindow menu, selectCommunication details to check that data from thedifferent sources are coming in.

Figure 4 The Communication Details for checking the sensor data

The actual strings received can be viewed here. All serial data received by serial lines will be displayed.

3.3.1 Initial system check

In order to confirm that the HMS software has been configured correctly, the following haveto be checked:

1. The Helideck Monitor software has been configured correctly.2. The Helideck Monitor software is running correctly.3. The MRU is providing motion data4. If part of the delivery, the meteorological sensors are providing weather data.5. If part of the delivery, the light panel is shining.

Power on the Processing Unit by pushing the switch on the lower part of the front panel andthe default HMS 100 display will appear on the screen as illustrated inFigure 1.

Select theStart button from theRun menu to check that the HMS software is runningcorrectly and that the MRU is providing motion data. At the bottom of the HMS 100 screen agreen light in the "MRU" square will confirm that the software is running normally and thatthe software is receiving motion data from the MRU, as illustrated inFigure 5.


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Figure 5 The HMS 100 main window in Run mode

If meteorological sensors are connected, a green light in the "Wind" square confirms that thesoftware is receiving weather data from the meteorological sensors. In the same way, if a light

panel is connected, a green light in the "Light" square confirms that the software is sendingout commands to the light panel. Above the "Wind" square a timer indicator is shown. Thisindicator moves when the HMS is displaying data on the screen.

These short tests have confirmed that the HMS 100 software has been properly configured. If there are any difficulties during these checks, please refer to chapter6.5 for troubleshooting.

3.3.2 System files

The HMS 100 system files are located as follows:

! Helideck.ini . This file includes the configuration settings for the HMS 100 system. Thefile is stored in the root of the WinNT directory and is named Helideck.ini.

! HELIDECK .exe . This is the HMS 100 executable software, which is default installed inthe directory \Program Files\Seatex\Helideck Monitor\.


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4. TECHNICAL DESCRIPTION

4.1 Introduction

The HMS 100 is used to analyse helideck motion during helicopter landings to improve safetyin hostile weather conditions. The HMS 100 monitors helideck attitude and vertical motionwind speed and direction, air temperature and barometric pressure and presents thisinformation as the landing conditions. The HMS 100 is typically used offshore on floating production and storage vessels (FPSO) and seismic vessels.

The system utilises the MRU H to precisely monitor helideck motion and meteorologicalinstruments to monitor environmental conditions (wind speed, wind direction, air temperatureand barometric pressure). The system processes the real-time data and presents it in a clear,easy-to-read, comprehensive display. A light panel can be connected to the HMS system inorder to show the landing light indication out on the helideck as a landing aid for thehelicopter pilots.

4.2 Design principles

The main component in the HMS system is the Processing Unit. This Processing Unit is aSeatex designed PC, which includes a number of RS-232 and RS-422 serial lines and ananalog to digital converter board for input of various data sources. The data sources aredisplayed in the HMS software called Helideck Monitor in a convenient way to assist in thehelicopter landing operations. The data sources that can be received and displayed by theHMS 100 are:

! Ship's roll, pitch, heave and heave velocity! Wind speed and direction! Air pressure, temperature and humidity

The roll, pitch, heave and heave velocity measurements of the ship motion are measured bythe MRU H motion sensor and input to the Processing Unit as an RS-232 signal. Optionally,

ship motion data can be input from the Seapath 200 system. The wind speed and directionmeasurements are input to the HMS computer as an RS-232 signal directly or through an RS-485 to RS-232 converter. The measurement of the air pressure can be taken from a sensor thatgives out an analog signal or a digital RS-232 signal.


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4.2.1 Interface protocols

The Helideck Monitor software can accept various interface protocols. The table belowsummarises how HMS receives input:

Data in Source Transferred by FormatRoll MRU/Seapath Serial line NMEA, Proprietary or EM3000Pitch MRU/Seapath Serial line NMEA, Proprietary or EM3000Heave velocity MRU/Seapath Serial line NMEA or ProprietaryHeave MRU/Seapath Serial line NMEA, Proprietary or EM3000Wind speed Anemometer Serial line NMEA MWV or MWDWind direction Anemometer Serial line NMEA MWV or MWDAir temperature Termistor Analog signal

on channel 0or serial line

4-20mA or NMEA XDR(,,,C)

Humidity Termistor Analog signalon channel 0or serial line

4-20mA or NMEA XDR(,,,H)

Air pressure Piezo-rest. Analog signalon channel 1or serial line

4-20mA, Proprietary or NMEAXDR(,,,P)

Heading Gyro/Seapath Serial line NMEA HDT, HDG or Proprietary

Position GPS/Seapath Serial line NMEA GGA, GLL, RMC or

ProprietarySpeed (SOG) GPS/Seapath Serial line NMEA VTG, RMC or Proprietary

Time Sync. GPS receiver Serial line NMEA ZDATable 1 Interface protocols

HMS 100 handles the following motion sensor protocols:

! NMEA - Transferring roll, pitch, heave velocity and/or heave.! Proprietary MRU normal or Seapath binary format 3 protocol - Same set of data. For MRU

baud rate 9600 and interval 100 ms is used. For Seapath baud rate 9600 and interval 0.1seconds is used.

! Proprietary EM3000 format with roll, pitch and heave data.

The proprietary formats are defined in [1] and [6] and setup is done with the MRC and SCCsoftware. Details on the NMEA input protocols for motion, wind, heading and time sync dataare given in "Appendix B - NMEA Input Protocols".

The analog data for air temperature is acquired by a PC add-on board which performs analogto digital conversion. Input to the HMS computer is 4-20 mA, which is converted to a voltageand read by the application from an A/D card.


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Air pressure can be input to the system either as analog or serial data, depending on sensor type. Analog data is input to the HMS Processing Unit as 4-20 mA, which is converted to avoltage and read by the application from an A/D card. Serial data is input as a proprietaryASCII based protocol defined in [3].

4.2.2 Transfer methods

4 . 2 . 2 . 1 S e r i a l l in e

The serial line follows the RS-232C (V.24) and the RS-422 standards. The default settingsdefined by the NMEA standard are:

Baud rate: 4800Parity: NoneData bits: 8Stop bits: 1

The HMS can be adjusted to other communication settings. There may be limitations on baudrates imposed by serial lines or serial line drivers.

4 . 2 . 2 . 2 A n a l o g s i g n a l s

The HMS hardware is designed/configured to accept differential analog input in the range 0-10 V or 0-5 V depending on A/D card type. The two analog channels are configuredindependently.

4.2.3 Roll and pitch determination

Roll and pitch are measured by the MRU. The MRU is a self-contained roll and pitchmeasuring device, which uses a combination of linear accelerometers and angular rate gyrosto sense the vessel motion. The MRU provides real-time roll and pitch data to the ProcessingUnit.

4.2.4 Heave position and velocity computation

The heave position and velocity are measured by the MRU. The heave motion computationfor position is a double integration over time for a selected average period To. Integration of the acceleration over time for each axis gives velocity and position. However, it is problematic to measure linear motions with long periods, like periods of 25 seconds or more.The reason for using a highpass filter on the acceleration measurements is to remove static or slowly varying errors. These errors will give errors in the velocity and position data. The filter may be made under-damped to improve the amplitude response slightly down to To and to

improve the phase response above To. The phase varies more close to To. Low damping also


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means ringing at the selected average period To. The user must tune this filter according to therequirements.The user can set the average period To in the range 1 to 25 seconds. If a too long period isselected, the velocity and position outputs will have a slowly varying error. If a short period ischosen, the estimated heave will have a phase error for long period motions.

A low damping factor% reduces the short term error for long period motions close to theselected average period To, since the phase error is reduced. However, ringing in the output atTo may cause some problems. The damping factor% can be set in the range 0.3 to 1.0.

In the software two different types of filter structures are implemented. The filter mode"General purpose" is implemented to achieve optimal amplitude performance, whereas the"Hydrographic survey" mode provides optimal phase performance. For the "Automatic" filter mode the hydrographic survey filter structure is used. This algorithm estimates the seaconditions by computing the dominating period of the waves seen from ship or vehicle andautomatically sets the average heave period To in real time during operations.

When using the MRU with the HMS 100 system the following heave filter settings arerecommended used:

Heave filter mode Period(s)

Damping

Hydrographic survey 20 0.7Automatic N/A N/A

4.3 System components

The HMS comprises three main components, which are physically separated.

! The Processing Unit with keyboard and PC mouse.! The MRU H motion sensor.! The Video Display Unit.

In addition comes:

! The MRU mounting bracket, MRU-M-MB1.! Junction box, MRU-E-JB1, with three metres MRU-E-CS1 cable.! Helideck Monitor display and configuration software, power cable, configuration cable

and documentation.! Optionally, meteorological sensors for wind speed and direction, air temperature and

barometric pressure.! Optionally, light panel for indication of landing limits on the helideck.


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Figure 6 The system components

4.3.1 Processing unit

The HMS Processing Unit is designed to fit standard 19-inch racks and is typically installedon the bridge or in the instrument room. The Processing Unit comprises the following main parts:

! Hard disk ! 3.5-inch floppy disk drive! Serial I/O board and computer main board! A/D-board

The lower part of the front panel includes the power on/ off switch and a 3.5-inch floppy disk drive for software installation and upgrade.


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Seatex HMS 100

Figure 7 Front panel of the Processing Unit

The rear panel of the Processing Unit contains communication interface ports for interfacingto external sensors as well as interface to the MRU H. These ports are individuallygalvanically isolated.

VGA

PPS

MOUSE

KEYB

NET

COM2

MRU

LPT1

AUX - SERIAL

COM5

COM6

COM7

COM8

COM9

COM10

ANT1 ANT2

ANT3

Class1: Must be connected to

Input : 100-240VAC/47-63Hz/100VA

grounded outlet only

Fuse : 2A

GPS GPS

IALA

Figure 8 Rear panel of the Processing Unit with connectors

The different ports are of the following type and use:

Connectors Type Connected toVGA Video display unitPPS 1 pulse-per-second Not in useMOUSE Connection to external PC mouseKEYB Keyboard NET Ethernet Not in useCOM 2 RS-232 Alternative PC mouseMRU RS-422 on Com 12 MRU data communicationLPT1 Parallel port Not in useAUX - Serial A/D converter Input of analog sensor signal, configurableCOM 5 RS-232 or 422 (default 232) User configurable inputCOM 6 RS-232 or 422 (default 232) User configurable inputCOM 7 RS-232 or 422 (default 232) User configurable inputCOM 8 RS-232 or 422 (default 232) User configurable input


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Connectors Type Connected toCOM 9 RS-232 or 422 (default 232) User configurable inputCOM 10 RS-232 or 422 (default 232) User configurable inputGPS ANT1 Not in useGPS ANT2 Not in useIALA ANT3 Not in use100/240VAC Power Input of 85 to 135 and 180 to 265V AC

4.3.2 MRU H

The Seatex MRU H is specifically designed for motion measurement in marine applications.The unit incorporates 3-axis sensors for linear acceleration and angular rate, along withcomplete signal processing electronics and power supply. The MRU H outputs absolute rolland pitch. Dynamic acceleration in the north, east and down direction as well as velocity andrelative position are also provided. The MRU achieves high reliability by using sensors withno rotational or mechanical wear out parts.

Figure 9 MRU H functional modules

The interior of the MRU is divided into two sub-assemblies consisting of an electronic unitand a sensor unit. The electronic unit consists of plug-in circular multi layer boards. The unitis divided into nine separate mechanical parts, which may be exchanged very quickly by plug-in boards when the housing cylinder has been removed. The housing cylinder should,however, not be removed by anyone else than Seatex.


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4.3.3 The Video Display Unit

The Video Display Unit is delivered as a 15-inch monitor for table mounting or for mountingon top of the Processing Unit in a 19-inch rack. The VDU can optionally be delivered as a 15-inch industrial monitor that fits into a 19-inch rack.

The VDU has to be mounted in a location easily visible for the personnel assisting inhelicopter landing operations.

4.3.4 Meteorological sensors

For technical description of the meteorological sensors see their individual documentation, [2]for the wind sensor, [3] for the air temperature sensor and [4] for the pressure sensor.

4.3.5 Light panel

For technical description of the light panel see appendix C in the Installation Manual ref. [2].


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Seatex HMS 100 User's Manual, rev. 9 Operating instructions

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5. OPERATING INSTRUCTIONS

5.1 Start-up procedure

1) Power-on the Processing Unit if not already done.

2) Start up the Helideck Monitor software in Windows NT if not already done. The followingwindow appears on the screen.

Figure 11 The default user interface screen in HMS 100

3) Select any additional presentation window from theWindow menu.

4) Select the landing limits for the vessel category or helicopter type to be monitored in themenu at the bottom of theLanding light indicator window. A menu of the alreadydefined operational limits will be shown by clicking on the menu button in this window. If the wanted landing limits are not on the list, select theOperation limits command on theConfig menu and then selectNew in the Available operation limits window. See chapter 5.2.5.4on how to generate a new set of landing limits.


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5) Select Start on the Run menu to start monitoring of the vessel motion and weather data onthe screen. In order to log data on file, select the commandEnable Logging . The MRUnormally needs some time before full accuracy is achieved and the light in the "MRU"square changes from red to green. The maximum warm-up time is 15 minutes.

The HMS 100 system is now ready for operational use.

5.2 Operation

Figure 11illustrates the default HMS 100 display which appears on the computer. The defaultHMS 100 display shows analog (meter style) indications of current values of roll, pitch, heaveand heave velocity, and if connected wind speed, wind direction, air temperature, humidityand barometric pressure. The display is designed to provide a clear picture of the vessel

motion, and by comparing the historical motion against the helicopter landing limits, HMS100 can assist the officer to evaluate the significance of ship motion and weather conditions tothe helicopter landing limits.

The HMS system is controlled from the HMS 100 window shown inFigure 12. From thiswindow the system is configured and the status of the HMS system is indicated by the fivelights at the bottom of the HMS 100 screen (MRU, Wind, Seapath, Light and Demo). A greenlight indicates that they are operating.

Figure 12 The HMS 100 main window


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Below is a table with the main window controls and their explanation.

Control Range Explanation

Indicator Off/On Visible if logging enabled, otherwise NOT VisibleMRU Off/On RED background when MRU data are invalid or missing.

YELLOW background when the MRU data areunreliable. GREEN background when data are stable & present. Remains grey when MRU input disabled.

Wind Off/On RED background when the wind sensor data are not present. GREEN background when data present.Remains grey when Wind Sensor input disabled.

Seapath Off/On RED background when the Seapath data are unstable or missing. GREEN background when data are stable & present. Remains grey when Seapath input is disabled.

Light Off/On RED background when no feedback from the light panelis received by the HMS system. GREEN backgroundwhen the HMS system receives feedback from the light panel. BLUE background when the HMS system receivesfeedback from the light panel telling that it is in NVGmode. Remains grey when the light panel is disabled.

Demo Off/On GREEN background when HMS is running in demomode. Remains grey when Demo mode is disabled.

Timer indicator Flat/Sunken A 3D control that gives the impression of movement. It"moves" when the HMS is displaying data on the screen.

Table 2 Main window controls

To operate HMS, simply selectWindow and the preferred view. Then selectStart on theRun menu.

5.2.1 Adjusting presentation window

The default start-up window is shown inFigure 11. However, the user may adjust this presentation window according to his requirements. Since the meters, history graphs, statisticsand the helideck report windows are defined as individual stand-alone windows, theunnecessary windows can be closed and others added. The following adjustments areavailable:

! The size of the individual window.! Shut down unwanted windows.! Add history graphs, statistic and helicopter report windows.

The modified presentation window will be saved and it will be the default window the nexttime the Helideck Monitor is started.


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Figure 13 A user modified HMS window

5.2.2 Selection of landing limits

During vessel operation, different helicopter types with different landing constraints may berequired to operate from the vessel. At the bottom of theLanding light indicator window inthe HMS 100 screen, a menu of the already defined operation limits will be shown by clickingon the menu button, as shown inFigure 14. From this menu, select the correct limits for thehelicopter to land or take off.

Figure 14 The landing light display with selection of available landing limitations


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If the landing limit for a helicopter or vessel category is not available in the menu, itsoperational limits have to be defined in the software first. This is done by selectingStop onthe Run menu, then selectingOperation limits from theConfig menu andNew in the Selectoperational limits dialogue box orImport to import an already defined landing limit, like for the different vessel categories on the Norwegian sector. See chapter5.2.5.4for a descriptionon how to define a new or import a predefined set of operational limits.

By clicking on the boxShow details , a window with light details appears on the screen, seeFigure 15 below.

Figure 15 Light details

This window shows the variables that have reached the limits. In addition, the motion rule for calculating the operational limits is shown together with the percentage availability over time

where the motion has been below the limit.

5.2.3 The File menu

The following figure displays the selections on theFile menu.

Figure 16 The File menu

The sub menu items are explained in the following sections.


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5 . 2 . 3 . 1 P r in t a n d p r i n t s e t u p

Before selecting thePrint command, ensure that the setup of the printer which is to be used isdone correctly. SelectPrint Setup and select the correct printer properties, paper and

orientation, as shown in the figure below.

Figure 17 The Print Setup menu

5 . 2 . 3 . 2 Ex i t H e l i d e c k M o n i t o r i n g

When the user shuts down the Helideck Monitor, the system will prompt the user for aconfirmation, so that the HMS 100 is not inadvertently shut down. SeeFigure 18.

Figure 18 The exit confirmation dialogue box

Any changes to the settings will automatically be saved in the HMS INI-file.


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5.2.4 The Run menu

5 . 2 . 4 . 1 H e l id e c k M o n i t o r s t a r t - u p

Run the Helideck Monitor by selectingStart on the Run menu, see below.

Figure 19 The Run menu

Two keyboard shortcut alternatives are offered for starting/stopping.

Note There are two ways in which the HMS 100 shows that it is actually running; 1)The timer indicator is "pumping", 2) TheConfig menu is dimmed (disabled).

5 . 2 . 4 . 2 H e l id e c k M o n i t o r l o g g i n g

The Helideck Monitor may be configured to record data in a log file.Figure 19shows theavailable entries for enabling or disabling logging to file. The terms enabling/disabling areused because the logging may be enabled before the Helideck Monitor is actually started.Once the Helideck Monitor is started, the logging process starts.

The logging may be enabled/disabled while the Helideck Monitor is running. In that case, thelogging will be started/stopped immediately. The HMS system will mark the start/stop withspecial entries in the log file. See section11 for details. In order to log data to file, selectEnable Logging . The logging indicator is then shown in the lower left part of the HMS 100window:

The location of the logging file and the oldest log file to be saved, are entered in theSettingsmenu underConfig .


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5.2.5 The Config menu

The following figure displays the selections on theConfig menu.

Figure 20 The Config menu

The sub menu items are explained in the following sections.

5 . 2 . 5 . 1 P a s s w o r d p r o t e c t i o n

The Config menu items are protected by a simple password:HMS (Note: Capital letters). Its purpose is not to be secret, but to prevent inadvertent changes caused by unqualified people.The password dialogue, shown below, will appear when the user tries to modify the setup.

Figure 21 The password authorisation dialogue box

5 . 2 . 5 . 2 Co m m u n i c a t io n s e t u p

In the communication setup dialogue box, select the tab for the sensor to be configured. Enter the configuration for each sensor according to the completed Installation Worksheet in the

Installation Manual , reference [1].


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Figure 22 The Communication Setup dialogue box

A selector indicates data input source. Data source may be one of the following:

! Sensor data! Demo data

Optionally, when no live data are available, "Demo data" can be selected to provide asimulated input. The HMS 100 will function as normal, with the exception that it will not be possible to actually inspect the serial data input buffers.

! HMS 100 accepts input from any serial line available in the system.

! All serial channels are separately configured. The settings are according to DOS syntax.Max. baud rate may be limited to 19200 on some serial lines. Whether the serial line is RS-232 or 422 is set in the software ("RSmode").

! The HMS system can be configured to automatically start running by selectingAutomatic"Start (F5)" on top of theCommunication Setup menu. The interval from when theHMS software is selected as the Program on the Start menu, until it starts running can beadjusted in the interval 10 to 65 seconds.

! The sequence of variables from the MRU can automatically be configured from theHelideck Monitor every timeStart is selected on theRun menu. This to ensure correctsequence of MRU data for calculation of the operational limits.

! All analog channels are separately configured. The settings correspond with the voltage for min. and max. values.


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! The light control settings are digital or serial.

5 . 2 . 5 . 3 S e t t i n g s

The following selections are available in this menu:

1) Display page 1 of 2This tab determines the ranges on the meters located in the various meter screens. The rangesfor the roll/pitch and heave meters may be set. WhenAuto is checked, the meters will beauto-scaled based on input data.

Figure 23 The display setting window no. 1

1) Display page 2 of 2In this tab the unit and display range of the different meteorological sensors are set. Theavailable unit for wind speed is m/s, knots, km/hr and miles/hr, and degrees Celsius or Fahrenheit on temperature.

Figure 24 The display setting window no. 2


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3) LoggingThe logging tab determines where the log file will be located, and determines the oldest logfile that will be kept.

There is one log file for each hour, so theOldest logfile parameter indicates how manylogfiles that will be kept, the number limited by the DOS operating system. Outdated logfileswill be deleted at the beginning of each new hour.

Click on the check box to the left of each variable in order to specify which items to be storedon the log file.

Figure 25 The Logging setup dialogue box

4) MRU Lever armsThe lever arm vectors from the MRU to the centre of the helideck are mainly set up in theMRU configuration as "Lever arm, CG" and "Lever arm, MP" vectors, but can also bedefined in the Helideck Monitor software. However, these vectors (Sensor and Target arm)arm are only to be defined in the HMS software if the MRU data are shared with other systemon-board that require an individual measurement points. Best possible transformation of theheave measurement to the helideck centre is achieved by defining the lever arms in the MRU.

Figure 26 The lever arms setup dialogue box


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In the HMS software the lever arm configuration parameters are grouped into two logicallyrelated items, sensor arm from CG and target arm from CG. The vector between the target position and the centre of gravity (CG) has to be measured or calculated based upon thedrawings or previous measured points. The vector between the sensor output position and theCG has to be measured or calculated in a similar way. The target arm means the distance between the CG and the centre of the helideck (Target Point, TP). The sensor arm means thedistance between CG and the heave output point (Lever arm, MP) defined in the MRU, herecalled the Sensor Point (SP).Vectors needed:

! From the CG to the Sensor Point (SP). Sensor Point is the same as the MRU measurement point (MP).

! From the CG to the Target Point (TP)

The positive axes directions for these arms are:

! X is positive from CG and forward (bow direction).! Y is positive from CG and to starboard side.! Z is positive form CG and down.

These vectors should be measured within$ 1 m relative to MRU.

Note These vectors should not be input in the Helideck Monitor software if the MRUmeasurement point (MP) is equal to the target position (TP).

Figure 27 The CG arm vector to TP and SP as defined in the HMS software

The default setting for heave measurements is that the heave mean level always will oscillatearound. This is performed by averaging out any offset in the heave mean level over aspecified heave window, that is default set to 5 minutes.

In order to make the heave mean level dependent on the roll and pitch measurements, click onthe checkbox "Heave mean level is roll/pitch dependent". Then the heave position in themeasurement points (MP) now longer has zero mean level, instead its value depends on the


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vessel tilt at any time. This option is useful especially in applications where the distance between the MP and the sea level is to be determined. If this mode is not selected, the heavewill always have zero mean level.

5 . 2 . 5 . 4 O p e r a t i o n a l l i m i t s

Helicopter operation limits for a specific vessel are often established based on calculated andtested limitations for the weather conditions under which a specific helicopter can beoperated. In the calculation of the helicopter operation limits, turbulence in different winddirections and speed over the helicopter deck together with the ship motion are taken intoaccount. These factors are further evaluated against the capacity of the helicopter regardingengine power, weight and manoeuvrability. Day and night conditions are also importantfactors for the helicopter pilot.

In the HMS 100, it is possible to enter various operational limits established for helicopter operations on a vessel. Based on the input operational limits, the HMS is able to calculate a"safe to land" light which is displayed on the HMS 100 screen. In theOperational Limitsmenu, up to 20 different operational limits can be defined. The operational limits aremanipulated using the commands shown inFigure 28.

Figure 28 Lists available operation limits

The available, already defined, operational limits are listed in the box. The followingcommands are available in this dialogue box:

! Select . Selects the highlighted operational limit.! Cancel . Closes the dialogue box without saving edited values.! Edit . Edits or views the selected operational limit.! New . Adds a new operational limit. If an operation is selected, the new operation limit will

be based on a copy of this selection, otherwise system default values will apply.


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! Import . Imports all the operational limits from file (a text based format generated with theExport command or predefined operation limits like for the Norwegian sector). Thiscommand will overwrite locally defined operational limits with the same index.

! Export . Exports all operational limits to disk file.

An operational limit is deleted by selectingEdit and pressingDelete within the next dialogue box. Index numbers are generated automatically and the first free index number is used.

The selection of commandsEdit or New will bring up this dialogue box.

Figure 29 The dialogue box for configuring motion limits

In this dialogue box, the criteria for red, yellow and green light indicators on the HMS 100screen are defined. The criteria will be based on the selected sources, motion rule and thelimit for each selected source. The limit for the sources roll, pitch, heave and heave velocitycan be made dependent on the wind speed. Instant values are used for wind.


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New operational limits are entered in the following way:

1) SelectConfigure on the HMS 100 menu and thenOperational limits .

2) SelectNew in the Available operational limits dialogue box.

3) In theMotion limits screen, enter the preferred description of this operational limitationin the Description area.

4) Select the sources to be used to calculate the operational limits. Click on the requiredsources and a tag will be shown in the check box to the left of the source.

5) Enter the motion rules for calculating the limits. Select the rule to be used, the timewindow in seconds and how close to the limit the calculation should be before the lightswitches from green to yellow. At the end of theMotion rule area, click on the box tomake the limits calculation dependent on relative wind speed. The roll, pitch, heave andheave velocity data are calculated according to a selected current rule and compared withthe respective limits. Available current rules are:

! No light . No rules used and the function is disabled.! RMS . A Root Mean Square (standard deviation) value is calculated for the current

time window. The time window width is defined below.! CAP 437 . Calculation performed according to UK CAA Recommendations (CAP 437).! Min/Max . Uses the largest nominal value in the time window. The time window

width is defined below.! Snapshot . Snapshot (instant) value is used and the time window width is thereforeignored.! SAP90 . Sigma values are calculated as a sum of largest positive/negative values in the

time window divided by 5.0. The Norwegian Coast Guard uses this rule.! Average . Average value of current time window. The time window width is defined

below.! Norwegian sector . This is the Norwegian continental shelf rule that calculates

average heave rate based on maximum heave and maximum heave period over thetime window.

6) Select the tab for each selected source and define its limitation.

7) SelectSave to save the entered operational limits and to leave this dialogue box. Click onthe entered operations limit to highlight it and then click on theSelect button. Then thelight indication on the HMS 100 screen will be calculated based on the entered operationallimit.


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Example 1: Landing limits for a Norwegian Coast Guard vessel during day operation

An HMS 100 system with meteorological sensors interfaced to it is installed on board a Norwegian Coast Guard vessel. The following helicopter operational limits during day flightsfor the helicopter type, Lynx Mk 86, are valid:

! Limitations on wind speed and relative wind direction are as follows:

Figure 30 Wind limitations for the Lynx helicopter during day flights

! Limitations to maximum roll and pitch motion for different wind speeds during a fiveminute period (SAP-90) are set to:

Relative wind (knots) Pitch (degrees) Roll (degrees)0 $ 2.50 $ 8.7520 $ 2.50 $ 8.7525 $ 2.75 $ 7.0030 $ 3.25 $ 5.5035 $ 3.50 $ 4.2540 $ 3.75 $ 2.5045 $ 4.00 $ 2.00

Table 3 Limits on the ship motion dependent on relative wind speed

The above limitations are entered in the Helideck software as follows:

1) On theSelect operational limits screen, select New .

2) On theMotion limits screen, first type in the description for this operational limit "LynxMk 86 (Day)" in the description area. Secondly, select the sources to be used to generatethe landing limitation. In this case, place a tag onRoll angle , Pitch angle , Wind speedand Wind direction . Then enter the motion rule for calculating the limits. In this case the

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Seatex HMS 100 User's Manual

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