CAUTIONARY NOTICES. Your attention is drawn to the following cautionary notices that apply throughout this Manual.

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3 Contents CAUTIONARY NOTICES Your attention is drawn to the following cautionary notices that apply throughout this Manual. WARNING The Meridian Surveyor weighs 15.5kg. To avoid personal injury, take proper precautions if you lift or move the equipment. WARNING There is a danger of serious injury from voltages inside the Meridian Surveyor. Do not remove the gyrocompass cover unless you have the necessary skills and experience to perform maintenance work on a system of this nature. Always power-off the system before you remove the cover for maintenance work. Observe all local safety regulations as you work on the equipment. Reconnect the safety grounding straps and refit all safety covers to the equipment before you power-on the system. WARNING Do not dispose of by fire or compacting, as toxic fumes, dust or liquids may be released. CAUTION You will void the warranty if you make any modifications to this equipment without prior permission from TSS (International) Ltd. DO NOT modify this equipment in any way without obtaining permission from TSS (International) Ltd. CAUTION The Meridian Surveyor includes precision components and bearings. To avoid causing damage to any part of the System, handle all items with care. Retain the original transit cases so that you can use them to transport the system when necessary. You will void the warranty if you use improper packing during transportation. CAUTION Severe damage to the Meridian Surveyor can occur if you move the gyrocompass while the rotor is still spinning without the servo system in operation. Note that the gyro rotor continues to spin for approximately five minutes after you power-off the system. To avoid potential damage to the Meridian Surveyor, always allow a period of five minutes after power-off for the gyro rotor to come to rest before you attempt to move the gyrocompass. DPN TSS (International) Ltd Issue 2.10 Page 1 of 6

4 Meridian Surveyor CAUTION During operation, the gyrocompass must remain level to within ±45. If it experiences tilt greater than 45 in any direction, it will topple. Never apply a tilt of more than 45 with the gyro rotor spinning or during the gyrocompass initialisation procedure. Note that the gyro rotor continues to spin for approximately five minutes after you poweroff the System. CAUTION If you install the gyrocompass in an enclosed space, make certain there is sufficient ventilation and circulation of free air to allow effective cooling. CAUTION Remove power from the gyrocompass before making any connections to external equipment. CAUTION You will void the warranty if you operate the gyrocompass outside the environmental conditions detailed in Section 4 and in BS EN CAUTION The Meridian Surveyor should be supplied with power from an SELV source as defined in IEC/EN The power supply source should be switched and protected by a suitable circuit breaker. CAUTION Perform these simple maintenance instructions only if you have the skills and experience required, and only when necessary. Inappropriate tampering with the internal controls and components of the gyrocompass can lead to damage or serious performance degradation. NEVER open the gyrocompass cover or make any adjustments inside the gyrocompass unless you are entirely confident in your actions. Page 2 of 6 Issue 2.10 TSS (International) Ltd DPN

5 Contents CONTENTS 1 Introduction System Description Gyrocompass Remote Control Unit Auxiliary Inputs Heading Outputs Principle of Operation Installation Unpacking and Inspection Physical and Electrical Installation Selecting a location Gyrocompass installation External Remote Control Unit Set the Gyrocompass DIP Switches Alignment Final Gyrocompass Installation Tests Installation Drawings Operating Instructions Control Features Initial Power-on Operating Procedure Latitude correction Speed correction DG operating mode Error Modes Loss of GPS Loss of speed log Gyrocompass system warnings and failures Operating Considerations General Operating Considerations Corrections for Speed and Latitude Operating at Extremes of Latitudes Operating Considerations for Vessel Dynamics Technical Data Specifications Power Requirements Performance (definitions as in ISO 8728) Compensation Environment Signal Inputs Signal outputs Dimensions and Weight Listener load requirement Talker drive capability Standards Data Formats IEC Serial Data Formats General information 4 5 DPN TSS (International) Ltd Issue 2.10 Page 3 of 6

6 Meridian Surveyor Inputs IEC input signals Pulsed input Outputs IEC output signals IEC sentence with Checksum Other Output Formats Robertson serial output SG Brown ASCII serial output Synchro Output Resolver Output Stepper S-Code Rate of Turn Maintenance Built-in Test Equipment Azimuth Drift Adjustment Azimuth Bias Adjustment Test Connector Diagnostic Output Sentence 5 6 Page 4 of 6 Issue 2.10 TSS (International) Ltd DPN

7 Contents TABLE OF AMENDMENTS Old Issue New Issue Date Details Jun 2000 New release A 12 Dec 2000 Corrected identification of Azimuth Bias potentiometer and other details. Include DIP switch default settings. 1.0A 1.0B 1 Mar 2001 Amendments to J8 configuration. Amendments to NMEA format definitions. 1.0B 1.0C 23 Apr 2001 Add notification to avoid product modifications. 1.0C 2.0 Aug 2002 Substantial amendments to reflect product enhancements Sept 2002 Completion of enhancement features including compliance with IEC Jan 2003 Minor amendments and description of Diagnostic Output Sentence Feb 2003 Modification to specifications and addition of Appendix B to demonstrate Certificate of Type Approval Mar 2003 Minor amendments to a display warning and a note referring to confirming software release July 2003 Note added regarding modification kit available for alternative orientations when attempting correct speed compensation August 2003 Minor amendments to specifications throughout March 2004 Amendments to alarms warning / failure designation June 2006 Revised Company Logo December 2006 Removed references to B and January 2008 Replaced manual setting of DG Mode on distribution board with Alarm Acknowledgement functionality. This enables compatibility with the Compass Changeover System. DPN TSS (International) Ltd Issue 2.10 Page 5 of 6

8 Meridian Surveyor Page 6 of 6 Issue 2.10 TSS (International) Ltd DPN

9 1 Introduction 1 INTRODUCTION The Meridian Surveyor is a master heading reference instrument that applies the characteristics of a dynamically tuned gyroscope and the effects of gravity and earth rotation to provide a true north reference. The Meridian Surveyor specification makes the System ideal for installation and operation on board vessels of almost any size and in a wide range of applications. Among the standard features of the Meridian Surveyor are: A short settling time Operation from a 24V DC electrical supply This Manual is an important part of the Meridian Surveyor. It describes the System and contains full installation and operating instructions. You should retain the Manual with the System for use by personnel who will install and operate it. Installation and operation of the Meridian Surveyor are not complex tasks. However, you should spend time to familiarise yourself with the contents of this Manual before you start to install or use the System. Time spent in identifying the task sequence now will ensure your System is operational in the minimum of time. WARNINGS Where appropriate, this Manual includes important safety information highlighted as WARNING and CAUTION instructions. You must obey these instructions: WARNING instructions alert you to a potential risk of death or injury to users of the System. CAUTION instructions alert you to the potential risk of damage to the System. For your convenience, the Contents section includes copies of all the WARNING and CAUTION instructions included in this Manual. Throughout this Manual all measurements conform to the SI standard of units unless otherwise indicated. IEC61162 and NMEA0183 are equivalent standards for interfacing marine electronic devices. Throughout this Manual IEC61162 is used. DPN TSS (International) Ltd Issue 2.10 Section 1 Page 1 of 6

10 Meridian Surveyor For your convenience, this Manual includes several sections, each of which describes specific features of the Meridian Surveyor: You should read sections 1 and 2 before you attempt to install the System: Section 1 contains introductory notes and describes those items supplied as standard. Section 2 describes how to select a suitable location for the gyrocompass. This section includes full instructions to install the System and connect it to external equipment. You should read sections 3 and 4 before you use the System: Section 3 describes how to operate the Meridian Surveyor. Section 4 includes the System specifications and descriptions of the data formats. You should read sections 5 if you suspect a fault on the System: Section 5 describes how to use the internal 60-way test connector and explains how to conduct simple adjustments with the gyrocompass housing removed. This Manual also contains the following appendices: Appendix A explains how a gyroscope can be made north seeking for use in a gyrocompass. Appendix B contains copies of Type Approval Certificates. CAUTION You will void the warranty if you make any modifications to this equipment without prior permission from TSS (International) Ltd. DO NOT modify this equipment in any way without obtaining permission from TSS (International) Ltd. Section 1 Page 2 of 6 Issue 2.10 TSS (International) Ltd DPN

11 1 Introduction 1.1 SYSTEM DESCRIPTION The Meridian Surveyor comprises two sub-assemblies: The gyrocompass housing The Remote Control Unit (RCU) Figure 1 1 shows the combined gyrocompass housing with the RCU included as an integral unit. The Meridian Surveyor applies dynamic tuning to settle automatically to the meridian. Due to the physical principles of a north-seeking gyrocompass, achievable accuracy depends on the operating latitude and the vessel dynamics. To optimise its performance, the Meridian Surveyor uses information supplied by external equipment, for example a GPS receiver and a speed log, to apply latitude and speed corrections. Refer to Appendix A for a simplified explanation of the gyrocompass theory of operation GYROCOMPASS Figure 1 1: Gyrocompass housing with integral RCU Figure 1 1 shows the gyrocompass housing, which contains the following items: True north seeking dynamically tuned precision gyroscope and gimbal suspension assembly. Power supply board. Digital and analogue control boards. RFI filter and distribution board. It is a relatively simple operation to install the gyrocompass and you should be able to accomplish this quickly without the need for specialised personnel or equipment. However, note that the gyrocompass weighs 15.5kg and you must take due care when you lift and move it. The care that you take when you align the gyrocompass housing with the surveyed fore-aft axis of the vessel will have a direct impact on the accuracy of heading measurements delivered by the System. Since the Meridian Surveyor is an ideal source of heading information for use by other systems on board, such as radars and satellite communication antennas, the accuracy of its heading measurements will DPN TSS (International) Ltd Issue 2.10 Section 1 Page 3 of 6

12 Meridian Surveyor have a wide impact throughout the vessel. You should therefore take care when you install and align the gyrocompass. Refer to Section 2 for full instructions to install, connect and align the Meridian Surveyor. The only component available for user servicing is a 3.15A line fuse inside the gyrocompass housing. In case of failure, refer to Section 5 for instructions for instructions on fault diagnosis and maintenance REMOTE CONTROL UNIT Figure 1 2: Remote Control Unit The Remote Control Unit (RCU) provides all the functions and indicators necessary to control and operate the Meridian Surveyor. The four-character LED can show a range of information: Heading in Degrees to Latitude. 80S to 80N Latitude Source Speed in Knots. 00 to 90 Speed Source Alarms and Status information Separate LED indicators show Power On and Compass Ready conditions Refer to Section 3 for instructions to operate the Meridian Surveyor. Section 1 Page 4 of 6 Issue 2.10 TSS (International) Ltd DPN

13 1 Introduction AUXILIARY INPUTS Auxiliary inputs may be used for the Meridian Surveyor to apply latitude and speed corrections. Ideally, the Meridian Surveyor should accept latitude and speed information from external sources such as a GPS receiver or a speed log. However, you may supply this information manually if external sources are not available. The advantage of using GPS or a speed log to provide correction signals is that they allow automatic corrections to be applied without operator intervention. Section 2 includes instructions to connect and configure the external sources of latitude and speed information. Section 3 includes instructions to set the latitude and speed manually HEADING OUTPUTS The Meridian Surveyor is a self-contained precision navigation instrument that is capable of supplying heading reference information simultaneously to a wide range of equipment on board the vessel. Throughout a typical vessel, applications that can use information supplied by the Meridian Surveyor include: Autopilot Radars GPS Radio direction finder Course plotter and recorder Satellite communication systems Satellite television To support this wide range of equipment types, the Meridian Surveyor can supply heading information simultaneously through multiple channels using any of the common transmission formats. Refer to Section 4 for a description of the available output channels and their data formats. Refer to Section 2 for details on how to interconnect to other equipment. 1.2 PRINCIPLE OF OPERATION In the absence of external influences, a free-spinning gyroscope will try to maintain a fixed orientation in space. The Meridian Surveyor exploits this property and uses gravity control and earth rotation to align the gyroscope spin axis with the meridian, i.e. the true north direction. Refer to Appendix A for the general theory of gyrocompass operation DPN TSS (International) Ltd Issue 2.10 Section 1 Page 5 of 6

14 Meridian Surveyor Section 1 Page 6 of 6 Issue 2.10 TSS (International) Ltd DPN

15 2 Installation 2 INSTALLATION To obtain the best performance from the Meridian Surveyor you must take care when you install and connect it. This section includes all the information and instructions you will need to complete these tasks. You should read this section carefully and understand the important instructions that it contains before you begin to install or connect the equipment. 2.1 Unpacking and Inspection Page 2 Explains the inspection checks that you should perform as you unpack the Meridian Surveyor. 2.2 Physical and Electrical Installation Page 3 Choose a suitable location to install the Meridian Surveyor. Connect the system to an electrical supply and to external equipment. 2.3 Alignment Page 15 The care that you take as you align the Meridian Surveyor with the fore-aft datum on the vessel will have a direct influence upon its accuracy. DPN TSS (International) Ltd Issue 2.10 Section 2 Page 1 of 20

16 Meridian Surveyor 2.1 UNPACKING AND INSPECTION WARNING The Meridian Surveyor weighs 15.5kg. To avoid personal injury, take proper precautions if you lift or move the equipment. CAUTION The Meridian Surveyor includes precision components and bearings. To avoid causing damage to any part of the System, handle all items with care. Retain the original transit cases so that you can use them to transport the system when necessary. You will void the warranty if you use improper packing during transportation. CAUTION Severe damage to the Meridian Surveyor can occur if you move the gyrocompass while the rotor is still spinning without the servo system in operation. Note that the gyro rotor continues to spin for approximately five minutes after you power-off the system. To avoid potential damage to the Meridian Surveyor, always allow a period of five minutes after power-off for the gyro rotor to come to rest before you attempt to move the gyrocompass. The Meridian Surveyor undergoes a full series of electrical and mechanical tests during manufacture and before dispatch. The packing case has a special design to protect the contents against shock during transit so that the equipment should arrive without damage or defect. As soon as possible after you have received the system, check all items against the shipping documents. Inspect all sub-assemblies carefully to check for any damage that may have occurred during transportation. If you see any damage file a claim with the carrier and immediately notify TSS (International) Ltd. To avoid loss or damage to any components of the system, store all sub-assemblies safely in the transit case until you need to install them. Obey the storage temperature limits listed in Section 4. Notify TSS (International) Ltd immediately if there are any components missing from the shipment. The title page of this Manual lists the contact details for TSS (International) Ltd. Section 2 Page 2 of 20 Issue 2.10 TSS (International) Ltd DPN

17 2 Installation 2.2 PHYSICAL AND ELECTRICAL INSTALLATION SELECTING A LOCATION There are certain guidelines that you should follow to install the Meridian Surveyor successfully: CAUTION During operation, the gyrocompass must remain level to within ±45. If it experiences tilt greater than 45 in any direction, it will topple. Never apply a tilt of more than 45 with the gyro rotor spinning or during the gyrocompass initialisation procedure. Note that the gyro rotor continues to spin for approximately five minutes after you poweroff the System. The gyrocompass weighs 15.5kg. Choose a mounting location that is level, flat and sufficiently strong to support the unit without flexing or experiencing extreme vibration. The mounting location can be open, as on a chart table, or enclosed within a cabinet. CAUTION If you install the gyrocompass in an enclosed space, make certain there is sufficient ventilation and circulation of free air to allow effective cooling. Choose a location that protects the Meridian Surveyor from damage. Do not install or operate the Meridian Surveyor where the ambient temperature could fall below 0 C or rise above +45 C, or where rapid changes of temperature can occur. Do not install the Meridian Surveyor close to strong mechanical or electrical noise sources, or in a location susceptible to vibration or shock. Allow a minimum distance of 0.4m between the gyrocompass housing and any standard magnetic compasses. Choose a location that allows convenient access to install, connect and service the Meridian Surveyor. Refer to Figure 2 4 for clearance dimensions. DPN TSS (International) Ltd Issue 2.10 Section 2 Page 3 of 20

18 Meridian Surveyor GYROCOMPASS INSTALLATION You must align the Meridian Surveyor so that its fore-aft axis is parallel to the fore-aft datum on the vessel. Any misalignment between the gyrocompass housing and the vessel will have a direct effect on the accuracy of heading measurements delivered by the system. To install the Meridian Surveyor you will need the following tools: Screwdriver 5.5mm 150mm Screwdriver 3mm 75mm Nut spinner 5.5mm 8.5mm drill 3 x M8 bolts of suitable length complete with washers and nuts Combination spanner 10mm Adjustable spanner opening to at least 33mm Suitable cables for the installation as indicated in Table 2 1. Table 2 1: Suitable cable types Purpose Power supply Synchro heading output Resolver heading output Stepper S-code output Serial data heading output Serial data speed input Serial data latitude input Suitable cable 7/0.5mm (1.5mm 2 ) HOFR sheathed to BS6883 7/0.4mm (1.0mm 2 ) butyl or EP rubber insulated, CSP sheathed, wire braided and CSP oversheathed. 1/0.85mm (0.6mm 2 ) twisted pair, butyl or EP rubber insulated, CSP sheathed, wire braided and CSP oversheathed. There should be no need to remove the gyrocompass cover during installation. The Connector Panel allows you to make all necessary power and signal connections to the Meridian Surveyor. There is a removable panel on the top of the gyrocompass that allows access to the internal DIP switches and a 60-way test connector. 1. During installation you must align the Meridian Surveyor so that its fore-aft axis is parallel with the fore-aft datum on the vessel. It is not necessary for the gyrocompass to be on the vessel centre line. There are alignment marks on the base of the Meridian Surveyor to help you achieve the correct alignment. 2. Three elongated securing holes machined into the gyrocompass base allow you to make fine adjustments to alignment after installation. With the gyrocompass positioned accurately, mark the supporting surface with the centre positions for the three securing holes. Refer to Figures 2 3 and 2 4 for dimensions. 3. Remove the gyrocompass and drill three 8.5mm diameter holes, using the marks you have just made on the supporting surface as hole centres. Deburr the holes and remove any swarf. Section 2 Page 4 of 20 Issue 2.10 TSS (International) Ltd DPN

19 2 Installation 4. Reposition the gyrocompass and align it to the fore-aft datum. Use three M8 bolts with washers and nuts to secure the gyrocompass in position. 5. Connect a 24V electrical supply (acceptable range 18V to 36V DC) to the Meridian Surveyor at J1, the three-pin power inlet on the Connector Panel. Figure 2 1 shows the Connector Panel. To prevent any possibility of damage to the gyrocompass while the vessel is moving it is recommended that an uninterruptable electrical supply is used to power the Meridian Surveyor. 6. Connect the ship s safety ground to the earthing stud adjacent to the electrical supply inlet J1. 7. Make all necessary signal connections to the Meridian Surveyor at the Connector Panel. To maintain EMC compliance you should terminate all wire braiding on the cables at the D-type back shells. Figure 2 1: Gyrocompass connector panel Gland plate release screws Cover plate release screws CAUTION Before removing the cover or the RCU unit, remove the gland plate and disconnect the RCU cable (TB1/17-22) from the distribution board. 24VDC Fuse 3.15AF Mfg. Date Watford, England. Serial No. Build Standard No. Compass Min. Safe Dist. m CAUTION Remove power from the gyrocompass before making any connections to external equipment. DPN TSS (International) Ltd Issue 2.10 Section 2 Page 5 of 20

20 Meridian Surveyor Table 2 2: J1 Power supply input pin details Pin Description 1 Protective ground 2 +24V DC 3 0V Table 2 3: Ports on the connector panel Port Function Style J1 Electrical supply inlet AMP-style square flange mounting J2 Synchro/S-type outputs See Table pin D-type socket J3 Rate of turn output See Table pin D-type socket J4 Serial data (Channel 1) outputs See Table pin D-type socket J5 Serial data (Channel 2) outputs See Table pin D-type socket J6 Serial data (Channel 2) outputs See Table pin D-type socket J7 Serial data inputs See Table pin D-type plug J8 Log input See Table pin D-type socket J9 Status and alarm outputs See Table pin D-type plug J10 Serial data (Channel 2) outputs See Table pin D-type socket J11 Serial data (Channel 2) outputs See Table pin D-type socket Table 2 4: J2 - Synchro/S-type outputs pin details Pin Description 1 Protective ground 2 0V Synchro/Resolver 3 26V Synchro R1 4 S3 Synchro Resolver 5 S2 Synchro Resolver 6 S1 Synchro 8 0V 12 L3 13 L2 14 L1 15 5V Section 2 Page 6 of 20 Issue 2.10 TSS (International) Ltd DPN

21 2 Installation Table 2 5: J3 - Rate of turn output pin details Pin Description 1 Protective ground 2 Rate of turn 3 ROT 0V 4 RCU 24V IN (+) 5 RCU 24V IN ( ) 6 RCU IN ( ) (N/C) 7 RCU ON/OFF 8 RCU RS422A (S+) 9 RCU RS422B (S-) Table 2 6: J4 - Serial data (Channel 1) outputs pin details Pin Description 1 Protective ground 3 RS232 Signal 7 RS232 Return 11 20mA Signal 12 20mA Return 18 RS422 (B) 19 RS422 (A) Table 2 7: J5 - Serial data (Channel 2) outputs pin details Pin Description 1 Protective ground 3 RS232 Signal 7 RS232 Return 11 20mA Signal 12 20mA Return 18 RS422 (B) 19 RS422 (A) DPN TSS (International) Ltd Issue 2.10 Section 2 Page 7 of 20

22 Meridian Surveyor Table 2 8: J6 - Serial data (Channel 2) outputs pin details Pin Description 1 Protective ground 3 RS232 Signal 7 RS232 Return 11 20mA Signal 12 20mA Return 18 RS422 (B) 19 RS422 (A) Table 2 9: J7 - Serial data inputs pin details Pin Description 1 Protective ground 2 GPS RS232 Signal 7 GPS RS232 Return 14 Log RS422 Return (B) 15 Log RS422 Signal (A) 16 Log RS232 Return 17 Log RS232 Signal 18 GPS RS422 Signal (B) 19 GPS RS422 Return (A) Table 2 10: J8 - Log inputs pin details Pin Description 1 LOG (TTL) 0V 2 LOG (TTL) Signal 4 Protective ground 5 LOG (contact closure) Signal 6 LOG (contact closure) 8 LOG OK 0V 9 LOG OK Signal Section 2 Page 8 of 20 Issue 2.10 TSS (International) Ltd DPN

23 2 Installation Table 2 11: J9 - Status and Alarm outputs pin details Pin Description 3 Gyro Ready relay (open when not ready, closes when ready) 4 Gyro Ready relay CC 5 Gyro Ready relay (closed when not ready, opens when ready) 6 Fail relay (normally closed, opens on failure) 7 Fail relay CC 8 Fail relay (normally open, closes on failure) 11 Alarm Acknowledge (0V) 12 Alarm Acknowledge ACK 13 Gyro Ready Return 14 Gyro Ready TTL Table 2 12: J10 - Serial data (Channel 2) outputs pin details Pin Description 1 Protective ground 3 RS232 Signal 7 RS232 Return 11 20mA Signal 12 20mA Return 18 RS422 (B) 19 RS422 (A) Table 2 13: J11 - Serial data (Channel 2) outputs pin details Pin Description 1 Protective ground 3 RS232 Signal 7 RS232 Return 11 20mA Signal 12 20mA Return 18 RS422 (B) 19 RS422 (A) DPN TSS (International) Ltd Issue 2.10 Section 2 Page 9 of 20

24 Meridian Surveyor EXTERNAL REMOTE CONTROL UNIT The standard Meridian Surveyor has the Remote Control Unit (RCU) mounted integrally and available for immediate operation. There may be applications where you prefer to install the RCU at some distance from the gyrocompass unit. A mounting kit, part number , is available to use in these circumstances. The kit includes the following items: RCU housing Mounting bracket Blanking plate for the gyrocompass housing There is no need to remove the gyrocompass cover to install the RCU externally: 1. Release and remove the four M3 screws at the corners of the RCU that secure it to the gyrocompass housing. 2. Lift the RCU away from the gyrocompass housing as far as its cable will allow. 3. Reach inside the gyrocompass housing and disconnect the RCU cable at TB1 on the Distribution Board. 4. Lift the RCU away from the gyrocompass. The cable run between the Gyrocompass and the RCU must not exceed 100 metres. 5. Use the bracket with the mounting kit to fix the RCU to a desk or to a bulkhead. You may also flush mount the RCU in a panel. Choose a suitable location to mount the RCU: The mounting surface can be vertical or horizontal according to requirements. Avoid installing the RCU where it might experience severe shock or vibration. Choose a location for the RCU that allows a clear view of the display in all conditions. 6. Use the two star knobs supplied to fit the RCU into the mounting bracket. Tilt the unit to a convenient viewing and operating angle and then lock it in place by tightening both star knobs. 7. Supply and fit a cable to connect the RCU to J3 pins 4 to 9 on the Connector Panel (refer to Table 2 5 for pin details of this port). The cable must have three screened twisted pairs and should not exceed 100 metres in length. 8. Fit the blanking plate to fill the gap left in the cover by the RCU. Section 2 Page 10 of 20Issue 2.10 TSS (International) Ltd DPN

25 2 Installation SET THE GYROCOMPASS DIP SWITCHES 1 There is a removable panel on top of the gyrocompass that allows access to the two internal DIP switches (shown in Figure 2 2) without the need to remove the main gyrocompass cover. Release and remove the three securing screws to lift off the panel. 2. Refer to Tables 2 14, 2 15, 2 16 and 2 17 to set the DIP switches for the specific requirements of your installation. Do not adjust the settings of other preset controls inside the gyrocompass. 3. Refit the access panel to the top of the gyrocompass cover. Figure 2 2: Location of DIP switches DPN TSS (International) Ltd Issue 2.10 Section 2 Page 11 of 20

26 Meridian Surveyor Table 2 14: SW1 DIP switch settings Poles 1 to 6 (Channel 1 configuration) SW2 DIP switch settings Poles 1 to 6 (Channel 2 configuration) Factory default settings appear in bold and are marked with an asterisk in this table The DIP switch settings described in this table are only applicable to gyrocompasses fitted with software versions BPR 0115 (Main) and BPR 0114 (RCU) or later. If necessary, you can view the software versions of the main and the RCU processors by pressing both the Up and the Down selection buttons simultaneously. The display will toggle between indications of the main processor software version (with prefix 'M') and the RCU software (with prefix 'R'). The display will continue to toggle for several seconds after you release the buttons and will then return to the heading indication = ON 0 = OFF (as marked on switch) Data Format Baud Rate Update Rate C-Sum Decimal Places ROT IEC Y 1 N IEC N 1 N IEC Y 1 N IEC N 1 N IEC Y 2 N IEC N 2 N IEC Y 2 N IEC N 2 N IEC Y 1 Y IEC N 1 Y IEC Y 1 Y IEC N 1 Y IEC Y 2 Y IEC N 2 Y IEC Y 2 Y IEC N 2 Y IEC Y 1 N IEC N 1 N IEC Y 1 N IEC N 1 N IEC Y 2 N IEC N 2 N IEC Y 2 N Section 2 Page 12 of 20Issue 2.10 TSS (International) Ltd DPN

27 2 Installation = ON 0 = OFF (as marked on switch) Data Format Baud Rate Update Rate C-Sum Decimal Places ROT IEC N 2 N IEC Y 1 Y IEC N 1 Y IEC Y 1 Y IEC N 1 Y IEC Y 2 Y IEC N 2 Y IEC Y 2 Y IEC N 2 Y IEC Y 1 N IEC N 1 N IEC Y 1 N IEC N 1 N IEC Y 1 N IEC N 1 N IEC Y 2 N IEC N 2 N IEC Y 2 N IEC N 2 N IEC Y 2 N IEC N 2 N IEC Y 1 Y IEC N 1 Y IEC Y 1 Y IEC N 1 Y IEC Y 1 Y IEC N 1 Y IEC Y 2 Y IEC N 2 Y IEC Y 2 Y IEC N 2 Y DPN TSS (International) Ltd Issue 2.10 Section 2 Page 13 of 20

28 Meridian Surveyor = ON 0 = OFF (as marked on switch) Data Format Baud Rate Update Rate C-Sum Decimal Places ROT IEC Y 2 Y IEC N 2 Y Robertson N/A 1 N/A SGB(10th) N/A 1 N/A SGB(6th) N/A 1 N/A SGB(10th) N/A 1 N/A SGB(6th) N/A 1 N/A SGB(10th) N/A 1 N/A SGB(6th) N/A 1 N/A All Data* 4800* 1* Y* 1* Y* Note: 1. For full IEC compliance, a checksum must be transmitted. Table 2 15: SW1 DIP switch settings Pole 7 (Analogue ROT Scaling) Factory default settings appear in bold and are marked with an asterisk in this table. 7 1=ON 0=OFF Analogue ROT Scaling (as marked on switch) 1 +/- 60 deg/min = +/- 10V 0* +/- 20 deg/s = +/-10V* Table 2 16: SW1 DIP switch settings Pole 8 (Vessel Dynamics) Factory default settings appear in bold and are marked with an asterisk in this table. 8 1=ON 0=OFF Vessel Dynamics (as marked on switch) 1 For HSC applications. Refer to (for gyrocompasses with serial numbers later than 3500) 0* Standard Control Mode* Section 2 Page 14 of 20Issue 2.10 TSS (International) Ltd DPN

29 2 Installation Table 2 17: SW2 DIP switch settings Poles 7 and 8 (Speed log input type) Factory default settings appear in bold and are marked with an asterisk in this table 7 8 1=ON 0=OFF Speed Log Input Type (as marked on switch) pulses/nm pulses/nm pulses/nm 0* 0* LOG Serial Data* 2.3 ALIGNMENT It is important to align the gyrocompass to the vessel accurately. Any misalignment between the housing and the vessel will appear directly as a fixed error in heading measurements. Because measurements from the Meridian Surveyor are available for use by diverse systems around the vessel, any misalignment between the gyrocompass and the fore-aft datum might have a significant impact in many other areas of application. There are several methods you may use to align the gyrocompass to the vessel foreaft datum: Align the gyrocompass to the fore-aft datum using a known reference line, such as a surveyed bulkhead or frame member. The marks on the gyrocompass base plate are precision indicators of the gyrocompass alignment orientation. To achieve correct speed compensation, the gyrocompass must be orientated so that the connector plate faces the forward end of the vessel. Note that modification kits are available for alternative gyrocompass orientations. Use the services of a marine surveyor to align the gyrocompass precisely with the fore-aft datum. Remove any residual misalignment by making minuscule adjustments to the gyrocompass mounting plate. When you have achieved perfect alignment, tighten the securing bolts fully to lock the gyrocompass in position. DPN TSS (International) Ltd Issue 2.10 Section 2 Page 15 of 20

30 Meridian Surveyor 2.4 FINAL GYROCOMPASS INSTALLATION TESTS After you have installed the gyrocompass and power supplies are available to it, perform the following installation tests: 1. Power-on the gyrocompass by following the instructions in sub-section 3.2. Wait for three hours before you perform the following tests. 2. Check the vessel heading against a known reference mark on a chart. Typically this could be the alongside position of the fitting-out dock. Alternatively, accurately survey an object at least five kilometres ahead of the vessel using the fore-aft line as a datum. 3. Check the displayed gyrocompass heading at intervals to make certain it is consistent with the surveyed vessel heading. 4. If there is an error larger than ±0.5, re-check the vessel fore-aft datum to confirm that it is correct. 5. Check that all the repeaters are accurately aligned with the gyrocompass heading and make certain they maintain their alignment at all times while the gyrocompass is powered-on. Section 2 Page 16 of 20Issue 2.10 TSS (International) Ltd DPN

31 Installation 2.5 INSTALLATION DRAWINGS Figure 2 3: Gyrocompass installation Sheet NE E SE S CAUTION Before removing the cover or the RCU unit, remove the gland plate and disconnect the RCU cable (TB1/17-22) from the distribution board. 24VDC Fuse 3.15AF NW N W SW DPN TSS (International) Ltd Issue 2.10 Section 2 Page 17 of 20

32 W E Meridian Surveyor Figure 2 4: Gyrocompass installation Sheet NE SE S CAUTION Before removing the cover or thercu unit, remove the gland plate and disconnect the RCU cable (TB1/17-22) from the distribution board. 24VDC 3.15AF Fuse NW N SW Section 2 Page 18 of 20Issue 2.10 TSS (International) Ltd DPN

33 2 Installation Figure 2 5: RCU installation Table mount DPN TSS (International) Ltd Issue 2.10 Section 2 Page 19 of 20

34 Meridian Surveyor Figure 2 6: RCU installation Flush mount Section 2 Page 20 of 20Issue 2.10 TSS (International) Ltd DPN

35 3 Operating Instructions 3 OPERATING INSTRUCTIONS This section explains how to power-on and configure the Meridian Surveyor after installation. Refer to Section 4 for an explanation of the data formats relevant to the System. 3.1 Control Features Page 2 The RCU provides all the controls you will need to operate the Meridian Surveyor. It also includes a four-character display panel that shows the heading indication, any alarm messages and error codes. 3.2 Initial Power-on Page 3 Explains how to power-on the Meridian Surveyor after installation and describes the initialisation sequence. 3.3 Operating Procedure Page 4 Explains how to select the latitude and speed correction sources, and how to set the latitude and speed manually if necessary. 3.4 Error Modes Page 6 Identifies the system error modes. Use these indicators to identify a possible fault condition. 3.5 Operating Considerations Page 9 Includes general advice for operating the Meridian Surveyor on a vessel and on high speed craft. DPN TSS (International) Ltd Issue 2.10 Section 3 Page 1 of 12

36 Meridian Surveyor 3.1 CONTROL FEATURES Figure 3 1: RCU front panel features The RCU front panel includes all the operator controls for the Meridian Surveyor: Table 3 1: RCU Control and Indicator functions Control Function Power switch. Recessed to prevent accidental operation. Selection Up. Press to increase display brightness. Selection Down. Press to decrease display brightness Latitude selection button. Press to display current Latitude source and correction value. Use in conjunction with the Selection Up and Selection Down buttons to pre-set Latitude source and correction value. Speed Selection. Press to display current Speed source and correction value. Use in conjunction with the Selection Up and Selection Down buttons to pre-set Speed source and correction value. Alarm. Press to silence the audible alarm Four digit alphanumeric display. Note: The display can show additional information by alternating the display contents at 0.5Hz. This is indicated throughout the manual as, for example, L52N + SGPS Power lamp (red) Ready lamp (green) Indicates that the Meridian Surveyor is switched on when 24V DC nominal power is connected. Indicates that the Meridian Surveyor has settled and a True Heading is available. Table 3 2: RCU display formats Format Function Heading DG DG_L Heading Only Heading with DG mode set at the RCU Heading with DG mode set by latitude greater than 80 deg Section 3 Page 2 of 12 Issue 2.10 TSS (International) Ltd DPN

37 3 Operating Instructions Table 3 2: RCU display formats Speed (by pressing the Speed button) S_01 + S.MAN S_01 + S.GPS S_01 + S.LOG S_01 + P.LOG Latitude (by pressing the Latitude button) L.52N + L.MAN L.52S + L.MAN L.52N + L.GPS Format Function Speed value with Manual selected speed source Speed value with GPS selected speed source Speed value with LOG selected speed source (serial data input) Speed value with LOG selected speed source and Pulse Log DIP switch set (pulse input) Latitude value in the Northern Hemisphere with Manual selected Latitude source Latitude value in the Southern Hemisphere with Manual selected Latitude source Latitude value with GPS selected Latitude source 3.2 INITIAL POWER-ON The Meridian Surveyor starting cycle is fully automatic after power is applied. For correct operation Latitude and Speed correction must be applied. 1. Check that there is a nominal 24V DC electrical supply available to the gyrocompass. The acceptable supply range is 18V to 36V DC. To ensure continuous operation, the power supply for this unit should have a 200W power rating. 2. To start the Meridian Surveyor press the power switch on the RCU. 3. Check that the red Power lamp on the RCU illuminates. This lamp indicates only that the Meridian Surveyor is receiving power and does NOT indicate a settled condition. The instrument illumination will be at maximum during the initialisation sequence. Even at its maximum setting, the instrument illumination may be difficult to see in bright ambient lighting. 4. The RCU will activate the audible alarm for about 1 second. The display will indicate T.E.S.T. and the Ready lamp will be lit for about 10 seconds while the system performs a series of self-tests. After successful completion of the selftests, the display will show the current Gyrocompass dial heading and the Ready lamp will go off until the Gyrocompass has settled. Initially the indicated heading could be inaccurate by as much as 180. The indicated heading should not be relied on until the Gyrocompass has settled, indicated by an illuminated Ready lamp. 5. Set the source of latitude information by following the instructions in sub-section Set the source of speed information by following the instructions in sub-section DPN TSS (International) Ltd Issue 2.10 Section 3 Page 3 of 12

38 Meridian Surveyor 7. Use the Selection Up and Selection Down buttons to adjust the RCU illumination level to a comfortable setting. 8. Wait for the gyrocompass to settle. This will occur automatically and will take upwards of 24 minutes depending on initial heading offset and sea conditions. The Meridian Surveyor signifies its settled condition by illuminating the green Ready lamp. 9. If necessary, you can view the software versions of the main and the RCU processors by pressing both the Selection Up and the Selection Down buttons simultaneously. The display will toggle between indications of the main processor software version (with prefix M ) and the RCU software (with prefix R ). The display will continue to toggle for several seconds after you release the buttons and will then return to the heading indication. 3.3 OPERATING PROCEDURE The Meridian Surveyor will settle automatically after power-on, to provide a true north reference. The system requires only latitude and speed correction, applied manually or from external sources, to perform to the specified accuracy. Ideally, the Meridian Surveyor should accept latitude and speed information from external sources such as a GPS receiver or a speed log, which allow the System to apply corrections automatically LATITUDE CORRECTION 1. Press and hold the Latitude selection button. 2. Use the Selection Up and Selection Down buttons to set the local latitude manually. The display will show the latitude in one-degree increments in the range 80 N to 80 S, for example L70N To select automatic latitude compensation from a GPS receiver, use the up or down selection buttons to scroll beyond 80 N or 80 S until the display shows LGPS. If there is no valid input available from a GPS receiver, the display will indicate a LGPS alarm after 30 seconds. 3. Release both buttons to set the latitude to the displayed value or to set the gyrocompass to use GPS as the source of automatic latitude correction. The display will indicate the latitude setting and latitude source for several seconds and will then return to the normal heading display. If you input the operating latitude manually, remember to change the setting when necessary. Note that, in medium latitudes, a 10 error in setting the operating latitude will result in a compass error of approximately 0.5. Section 3 Page 4 of 12 Issue 2.10 TSS (International) Ltd DPN

39 3 Operating Instructions SPEED CORRECTION 1. Press and hold the Speed selection button. 2. Use the Selection Up and Selection Down buttons to set the speed manually in the range zero to 90 knots. To select automatic speed compensation from a GPS receiver or a speed log, use the Selection Up button to scroll beyond 90 knots until the display shows SGPS or SLOG. If there is no valid input available from a speed log or GPS receiver, the display will indicate a SLOG or SGPS alarm after 30 seconds. 3. Release both buttons to set the speed to the displayed value or to set the gyrocompass to use GPS or a speed log as the source of automatic speed correction. The display will indicate the speed setting and speed source for several seconds and will then return to the normal heading display. If you input the vessel speed manually, remember to set the average vessel speed and to change the setting when necessary. Return the setting to zero on completion of the voyage. For a vessel steaming in a northerly direction, a 5-knot error in speed setting will generate an error of approximately DG OPERATING MODE To select Directional Gyro (DG), use the Selection Up and Selection Down buttons to scroll beyond 80 N or 80 S until the display shows DG. In this mode you can use the Meridian Surveyor as a direction indicating instrument all the way up to the poles. If the gyrocompass has settled on north immediately prior to entering the DG mode, it will continue to provide a useful indication of the northerly direction for a period, but will not continue to seek north. The length of time that the direction indication remains valid depends entirely on the gyro drift characteristics. DG mode will be automatically enabled for latitudes settings greater than 80 applied from the GPS input. The gyrocompass will not north seek while operating in the DG mode. DPN TSS (International) Ltd Issue 2.10 Section 3 Page 5 of 12

40 Meridian Surveyor 3.4 ERROR MODES The Meridian Surveyor has three possible Error modes: 1. Loss or corruption of GPS signal 2. Loss or corruption of speed log signal 3. Gyrocompass system warnings and failures LOSS OF GPS This failure mode can occur when you have selected GPS as the source of speed or latitude information and the signal corrupts or becomes lost for a period of 30 seconds. You can recognise this condition by the following indications: The display shows S.GPS + FAIL for the loss of speed correction information. The display shows L.GPS + FAIL for the loss of latitude correction information. The audible alarm will sound. Press the Alarm button to cancel the audible alarm. 1. The Gyrocompass will use the last valid speed and latitude values. 2. The RCU will continue to show the alarm message until a valid input signal is reestablished or a different input source is selected. 3. If the valid input signal has not been established within a period of 30 minutes the audible alarm will be enabled LOSS OF SPEED LOG This failure mode can occur when you have selected speed log as the source of speed information and the signal corrupts or becomes lost for a period of 30 seconds. You can recognise this condition by the following indications: The display flashes SLOG + FAIL for the loss of selected serial data source information. The display flashes PLOG + FAIL for the loss of pulsed selected source information. The audible alarm will sound. Press the Alarm button to cancel the alarm. 1. The Gyrocompass will use the last valid speed value. 2. The RCU will continue to show the alarm message until a valid input signal is reestablished or a different input source is selected. If a valid input signal has not been established within a period of 30 minutes the audible alarm will be enabled. Section 3 Page 6 of 12 Issue 2.10 TSS (International) Ltd DPN

41 3 Operating Instructions GYROCOMPASS SYSTEM WARNINGS AND FAILURES The Meridian Surveyor has a built-in system that monitors operation of the gyrocompass. The functions that this system checks are split into two categories. Warning conditions Failure conditions A failure condition will result in the Gyroscope power supply being disabled. Refer to the maintenance section 5 before activating the Power Supply. Warning Conditions If the gyrocompass detects a warning condition, it will use two methods to alert you: The display shows <Message> + FAIL The audible alarm will sound. Press the Alarm button to cancel the audible alarm. Table 3 3: Gyrocompass warning codes <Message> RCU Screen dc + fail ac + fail rdc + fail Temp + fail rmt + fail Definition of warning code Internal DC power supply is outside operating limits Internal AC power supply is outside operating limits Loss of internal timing signals Over or under operating temperature range Loss of serial communication link with the RCU The RCU will continue to show the alarm message until the fault condition has been removed. If the fault condition has not been removed within a period of 30 minutes the audible alarm will be enabled. Refer to sub-section 5.1 which outlines some simple checks that you can make to rectify these fault conditions. If necessary contact TSS (International) Ltd or an approved local service agent for assistance. DPN TSS (International) Ltd Issue 2.10 Section 3 Page 7 of 12