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Tritech iGC Product Manual

Intelligent gyro compass
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Intelligent Gyro Compass (iGC)
Intelligent Gyro Compass (iGC)
Product Manual
0707-SOM-00004-7
1
© Tritech International Ltd.

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  • Page 1 Intelligent Gyro Compass (iGC) Intelligent Gyro Compass (iGC) Product Manual 0707-SOM-00004-7 0707-SOM-00004-7 © Tritech International Ltd.
  • Page 2 The copyright in this document is the property of Tritech International Ltd. The document is supplied by Tritech International Ltd on the understanding that it may not be copied, used, or disclosed to others except as authorised in writing by Tritech International Ltd.

  • Page 3: Table Of Contents

    5.2. Overview ....................20 5.3. Powering up for the first time ..............20 5.4. Checking iGC output using a terminal programme ........21 5.5. Checking iGC output on an RS485 interface ..........22 5.6. iGC data Check procedures ................ 22 5.6.1.
  • Page 4 B. General Assembly Drawing ................... 39 C. iGC Bill of Materials ....................40 D. iGC Mode Listing - Proprietary iGC Outputs ............41 E. iGC Mode Listing - Special Modes ................ 43 F. iGC Mode Listing - Industry Standard Modes ............46 G.

  • Page 5: Help & Support

    Under no circumstances should a product be returned that is contaminated with radioactive material. The name of the organisation which purchased the system is held on record at Tritech International Ltd and details of new software or hardware packages will be announced at regular intervals.

  • Page 6: Warning Symbols

    Intelligent Gyro Compass (iGC) Warning Symbols Throughout this manual the following symbols may be used where applicable to denote any particular hazards or areas which should be given special attention: Note This symbol highlights anything which would be of particular interest to the reader or provides extra information outside of the current topic.

  • Page 7: Safety Notices

    1. The iGC has ceased to function after flooding 2. A water-ingress alarm has been generated 3. If the iGC is shaken fluid can be heard or felt moving around inside the housing 4. During removal, the pressure dome is very tight on its threads 5.

  • Page 8: Electrics

    This applies as much to supply circuitry as to the equipment described in this manual. Before doing any work inside the iGC the electrical power supply to the iGC should isolated and the power connector unplugged. This includes electrical...

  • Page 9: Introduction

    In order to find applications in a wide range of areas, the output data from the iGC is selectable by the user to match numerous industry standard formats. This allows the iGC to ‘emulate’...

  • Page 10: Intelligent Fibre-Optic Gyro (Ifg)

    ~1° heading per hour. The combination of an iGC and iFG can be used to replace traditional spinning mass gyro compasses with a more reliable solid-state solution with significantly better drift-rate performance.

  • Page 11: Typical Applications

    Intelligent Gyro Compass (iGC) 3. Typical Applications There are various method of integrating the iGC with existing control systems, the following drawings illustrate typical applications. 0707-SOM-00004-7 © Tritech International Ltd.
  • Page 12 Typical Applications Intelligent Gyro Compass (iGC) 0707-SOM-00004-7 © Tritech International Ltd.
  • Page 13 In addition to the sketches shown, there are numerous alternative options for interconnection of the iGC product family to existing or bespoke control systems. If your desired application is not shown, please contact Tritech for advice on the best method of achieving the interface that you require.

  • Page 14: Installation

    (Refer to Section 4.3, “ Installation Drawing ” for details). To maximise the accuracy of the iGC outputs, its pitch, roll and yaw axes should be aligned, as accurately as possible, with the pitch, roll and yaw axes of the host system / vehicle.

  • Page 15: Stiffness

    Installation Intelligent Gyro Compass (iGC) 4.2.4. Stiffness The iGC should be rigidly mounted so that flexibility and / or system vibration does not affect the outputs. 4.2.5. Collision Protection To protect against accidental damage, the iGC should be mounted in a protected location.
  • Page 16 The following drawing details the pin-outs of the iGC: If the operating mode that the iGC is to be used in differs from the mode settings as the unit was supplied, the iGC will need to be opened and the Mode Switch settings adjusted. This is covered in section 7.4.2 below.

  • Page 17: Adjusting Igc Mode Or Jumpers

    RS485 communications. 4.4.2. Adjusting iGC Mode or Jumpers In order to adjust the Mode switch settings the iGC must be opened. Firstly isolate the iGC supply and disconnect the iGC from its interconnecting cable (if already connected).

  • Page 18: Electrical Installation

    Caution Do not connect the cable to the iGC until provision of correct voltage to the correct pins on the iGC connector has been checked (see Section 5 - Commissioning). 0707-SOM-00004-7...
  • Page 19 Care should be taken when providing power to an iGC and iFG combined system. The iGC has a lower voltage range than the iFG. Over voltaging the iGC will result in damage.

  • Page 20: Commissioning

    If problems persist, it may be necessary to examine the data signals with an oscilloscope or a breakout box with LED indicators. If the iGC data is still not received correctly, the output and mode settings of the iGC should be checked with a terminal programme 0707-SOM-00004-7 ©...

  • Page 21: Checking Igc Output Using A Terminal Programme

    Intelligent Gyro Compass (iGC) 5.4. Checking iGC output using a terminal programme The output data from the iGC RS232 port should be connected to a PC or Laptop with an RS232 serial port using a suitable test cable. Details of a suitable cable are found in Appendix K – the programming switch connections are not required however for this test.

  • Page 22: Checking Igc Output On An Rs485 Interface

    Host MUST be connected for reliable performance 4. Additional ‘alien’ devices on the RS485 bus – if the iGC RS485 bus is connected other than ‘point-to-point’ from iGC to Host, the other devices on the bus should be approved Tritech devices, and configured to Tritech specifications.

  • Page 23: Heading Checks

    360° heading and check the correlation with the reference gyrocompass or against cardinal compass points. If the data from the iGC is not satisfactory, following steps in Chapter 6, Calibration , may make improvements. It should be noted that attempting to check magnetic heading performance on a Steel hulled / decked vessels or in close proximity to steel structures (e.g.

  • Page 24: Other Data Checks

    (or a resistance less than 300kohm) across the sensor pins. 5.6.5. Other Data Checks In iGC Proprietary data formats, additional data such as iGC temperature, serial number etc. are available. These can be checked using the iGC Navigation Software.

  • Page 25: Calibration

    6. Calibration 6.1. Introduction If the iGC has been mounted to align closely with the host system’s axes and away from the magnetic influence of other equipment, it is expected that, in the majority of cases, no further calibration will be required.
  • Page 26 Calibration Intelligent Gyro Compass (iGC) calibration software on the PC. The iGC then compares this with its measured heading and stores the difference. This procedure is repeated for various points around the compass. Upon completion of the swing routine, the iGC constructs an offset curve by extrapolating between the measured points and stores this in memory.

  • Page 27: Operation

    ‘Industry Standard’ ASCII formats. This mode is useful where specific telegram decoding / parsing can be implemented by the Host system. Full details of the output data formats in Proprietary modes can be found in Appendix D, iGC Mode Listing - Proprietary iGC Outputs.

  • Page 28: Operational Issues

    Heading, Pitch, Roll, turns counter, heave and iGC status. Normally this software is used where the iGC is not integrated to a complete host control system, but it can be used in parallel with an existing host control system, providing certain interface criteria are met.
  • Page 29 Turns Counter Digital display of number of turns made by iGC system since power-up or last reset. Range ±9.9 turns to 1 decimal place. iGC Temperature Digital display of iGC internal temperature. –9.9°C to +70°C range to 1 decimal place.
  • Page 30 Operation Intelligent Gyro Compass (iGC) Typical screenshot: 0707-SOM-00004-7 © Tritech International Ltd.

  • Page 31: Maintenance

    In addition there are no user serviceable parts inside the iGC. 8.3. Seals Seal integrity is vital for the continued reliability of the iGC. There are two ‘O’-ring seals in the assembly – one between the dome and end-cap and the other between the Subconn connector and end-cap.

  • Page 32: Storage

    8.6. Flooding If the iGC is flooded for any reason, then speed is of the essence. If the system software / interface supports the water ingress sensor signal, the iGC should be powered down immediately that the sensor detects water ingress.

  • Page 33: Dismantling And Re-Assembly

    Maintenance Intelligent Gyro Compass (iGC) In all cases it is recommended that the unit be returned to Tritech for repair / test and pressure testing prior to returning to service. 8.7. Dismantling and Re-assembly Before starting to dismantle the iGC: 1.

  • Page 34: Removal Of The Underwater Connector

    3. Using a box spanner or a deep socket (19mm A/F), slacken the connector. Holding the iGC end-cap (Item 2) in a vice by means of two M5 screws in the mounting holes is the easiest way to react the torque required to slacken the connector 4.
  • Page 35 5. Using a multimeter, check that there is no electrical continuity between the tab of both regulators and the iGC end-cap. There is a threaded hole on the inside surface of the end- cap that facilitates electrical continuity for checking. This is important, as a short circuit between the regulator tabs and the iGC housing may cause rapid corrosion of the iGC housing.

  • Page 36: Basic Fault Finding

    PCB assembly level). The following are guidelines on how to approach the diagnosis of a fault in the system: 1. Assemble all relevant information on the iGC and any other systems that interface with the iGC. This might include: a.

  • Page 37: Firmware Reprogramming

    Reset LED should flash once when power is first applied, then go dark. 9.3. Firmware Reprogramming If required, the unit should be returned to Tritech International Ltd in order to reprogram the unit with firmware. 0707-SOM-00004-7 © Tritech International Ltd.

  • Page 38: Igc Technical Specifications

    79mm Height 121.5mm Notes: 1. Specifications are correct at time of issue, but are subject to change in line with Tritech’s policy of continual product development. 2. Quoted accuracies are based on typical performance tests. 0707-SOM-00004-7 © Tritech International Ltd.

  • Page 39: General Assembly Drawing

    Intelligent Gyro Compass (iGC) Appendix B. General Assembly Drawing 0707-SOM-00004-7 © Tritech International Ltd.

  • Page 40: Igc Bill Of Materials

    Notes: 1. Spares are available from Tritech by quoting BOM and item number 2. Refer to Recommended Spares List for cross-reference 3. To maintain warranty and get the best performance from the iGC, only use genuine spare parts 0707-SOM-00004-7 © Tritech International Ltd.

  • Page 52: Igc Recommended Spares

    Notes: 1. Spares are available from Tritech by quoting BOM and item number 2. Refer to Recommended Spares List for cross-reference 3. To maintain warranty and get the best performance from the iGC, only use genuine spare parts 0707-SOM-00004-7 © Tritech International Ltd.

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