Teledyne HydroPACT 350 User manual

User Manual
HydroPACT 350
Subsea Cable Tracking System
500272 - HydroPACT 350 110V a.c. 3000m
500277 - HydroPACT 350 230V a.c. 3000m
500320 - HydroPACT 350 110V a.c. 6000m
500321 - HydroPACT 350 230V a.c. 6000m
© 2019 Teledyne Ltd.
The information in this manual is subject to change without notice and does not represent a
commitment on the part of Teledyne Ltd. All drawings, technical content and the intellectual
property associated with this manual is property of Teledyne Ltd.No content should be copied or
distributed in any way without the express permission of the company.
Document Part Number: 402197
Issue: 7.1
Date: January 2019
Teledyne Marine
International Avenue, ABZ Business Park,
Dyce, Aberdeen AB21 0BH UK
Tel: [phone]
Email: [email protected]

DPN 402197 Issue 7.1 © Teledyne Limited i
Contents
Contents ............................................................................................................................................ i
List of Figures................................................................................................................................. vi
List of tables ................................................................................................................................. viii
Revision History ............................................................................................................................. ix
Glossary ........................................................................................................................................... x
1 Introduction ............................................................................................................................... 1-1
1.1 Conventions used ............................................................................................................... 1-1
1.2 System Description ............................................................................................................. 1-1
1.3 Principle of Operation ......................................................................................................... 1-3
1.4 Warranty ............................................................................................................................. 1-3
1.5 Product Support ................................................................................................................. 1-4
2 Installation ................................................................................................................................. 2-1
2.1 Unpacking and Inspection ..................................................................................................2-1
2.1.1 Scope of Supply .........................................................................................................2-1
2.2 Physical Installation ............................................................................................................ 2-2
2.2.1 SEP ............................................................................................................................ 2-2
2.2.2 Coil Array .................................................................................................................... 2-3
2.2.2.1 Assembling the coil array .................................................................................... 2-4
2.2.2.2 Mounting the coil array ........................................................................................ 2-6
2.2.3 Altimeter Installation ................................................................................................. 2-10
2.2.4 Installation Checklist ................................................................................................. 2-11
2.3 Electrical Installation ......................................................................................................... 2-11
2.3.1 Ground Connections ................................................................................................ 2-13
2.3.2 Care of Subsea Connectors ..................................................................................... 2-13
2.3.3 Subsea Electronics Pod ........................................................................................... 2-14
2.3.3.1 Power requirement............................................................................................ 2-14
2.3.3.2 Alternative Communication Methods................................................................. 2-15
2.3.3.3 Changing communication settings in the SEP .................................................. 2-17
2.3.4 Sensing Coils ...........................................................................................................2-20
2.3.5 Subsea Altimeter ...................................................................................................... 2-21
2.3.5.1 Direct connection to the SEP ............................................................................ 2-21
2.3.5.2 Connection to the topside computer ................................................................. 2-21
3 Operating software ................................................................................................................... 3-1
3.1 Initialisation ......................................................................................................................... 3-1
3.2 Initial Configuration ............................................................................................................. 3-1
3.2.1 SEP type .................................................................................................................... 3-2
3.2.2 Communication ports ................................................................................................. 3-2

ii © Teledyne Limited DPN 402197 Issue 7.1
3.2.3 System Parameters .................................................................................................... 3-4
3.2.3.1 Tone frequency ................................................................................................... 3-4
3.2.3.2 Tone frequency reminder interval........................................................................ 3-5
3.2.3.3 Threshold ............................................................................................................ 3-5
3.2.3.4 Coil separation .................................................................................................... 3-6
3.2.3.5 Coil calibration constants .................................................................................... 3-6
3.2.4 Print Configuration ...................................................................................................... 3-6
3.3 Operating DeepView .......................................................................................................... 3-7
3.3.1 Menu commands ........................................................................................................ 3-8
3.3.2 View Menu ................................................................................................................ 3-11
3.3.2.1 Run Window...................................................................................................... 3-11
3.3.2.2 Forward Search Window................................................................................... 3-14
3.3.2.3 Scope and Spectrum Analyser Window ............................................................ 3-15
3.3.2.4 System Errors Window...................................................................................... 3-17
3.3.2.5 Terminal Window............................................................................................... 3-18
3.3.2.6 Video Overlay Enable ....................................................................................... 3-19
3.3.3 Configuration Menu .................................................................................................. 3-19
3.3.3.1 System parameters ........................................................................................... 3-19
3.3.3.2 Altimeter ............................................................................................................ 3-19
3.3.3.3 External data logging ........................................................................................ 3-22
3.3.3.4 Load factory defaults......................................................................................... 3-22
3.3.3.5 Video overlay setup........................................................................................... 3-23
3.3.4 Toolbars ................................................................................................................... 3-24
3.3.5 Function Keys ...........................................................................................................3-26
3.4 Replaying a Log File ......................................................................................................... 3-27
3.5 Quality Control .................................................................................................................. 3-27
3.6 Reinstall DeepView Procedure ......................................................................................... 3-28
4 Operating Procedure ................................................................................................................ 4-1
4.1 Pre-Survey Preparation ...................................................................................................... 4-1
4.1.1 Training ...................................................................................................................... 4-1
4.1.2 Tone Frequency ......................................................................................................... 4-1
4.1.3 Survey Requirements ................................................................................................. 4-2
4.1.4 Installation Requirements ........................................................................................... 4-2
4.2 Pre-dive Checks ................................................................................................................. 4-2
4.3 During the survey ............................................................................................................... 4-3
4.3.1 Data Logging .............................................................................................................. 4-4
4.3.2 Replay Logged Data ................................................................................................... 4-4
4.4 After the Dive ...................................................................................................................... 4-5
4.5 Data Formats ...................................................................................................................... 4-6
4.5.1 External Logging Format ............................................................................................ 4-6
4.5.1.1 Co-ordinates and Signals Format........................................................................ 4-6

DPN 402197 Issue 7.1 © Teledyne Limited iii
4.5.1.2 Forward Search mode......................................................................................... 4-8
4.5.2 Internal Logging Format ............................................................................................. 4-9
4.6 Altimeter Data Format ...................................................................................................... 4-12
4.6.1 Benthos PSA 916 ..................................................................................................... 4-12
4.6.2 Datasonics PSA 900 and PSA 9000 ........................................................................ 4-13
4.6.3 Ulvertech Bathymetric System ................................................................................. 4-13
4.6.4 Simrad UK90 ............................................................................................................ 4-14
4.6.5 OSEL Bathymetric System ....................................................................................... 4-14
4.6.6 Tritech SeaKing Bathy 704 ....................................................................................... 4-15
5 Operational Considerations .................................................................................................... 5-1
5.1 Operating Performance ...................................................................................................... 5-1
5.2 Sources of Error ................................................................................................................. 5-1
5.2.1 ROV Handling ............................................................................................................5-1
5.2.1.1 ROV position over the target ............................................................................... 5-2
5.2.1.2 The effects of roll, pitch and skew....................................................................... 5-3
5.2.1.3 Slope ................................................................................................................... 5-4
5.2.2 Electrical Interference .................................................................................................5-5
5.2.2.1 The ROV ............................................................................................................. 5-5
5.2.2.2 Vibration ..............................................................................................................5-5
5.2.2.3 Power-carrying cables......................................................................................... 5-6
5.2.2.4 Impressed-current cathodic protection ................................................................ 5-6
5.2.2.5 Operating over ferrous rock dumps..................................................................... 5-6
5.2.2.6 Earth return path ................................................................................................. 5-6
5.2.2.7 Curved target course........................................................................................... 5-7
5.3 ROVs .................................................................................................................................. 5-7
5.3.1 Speed of Operation .................................................................................................... 5-7
5.3.2 Altitude above the Seabed ......................................................................................... 5-7
5.3.3 Tracked ROV .............................................................................................................. 5-8
6 Maintenance .............................................................................................................................. 6-1
6.1 System Description ............................................................................................................. 6-1
6.2 Coil Cable Continuity .......................................................................................................... 6-2
6.3 Fault Identification .............................................................................................................. 6-2
6.3.1 Fault on a Single Channel .......................................................................................... 6-4
6.3.2 Communications Failure ............................................................................................. 6-5
6.3.3 Poor Tracking Performance ....................................................................................... 6-6
6.3.4 Altimeter Failure ......................................................................................................... 6-7
6.4 Spares ................................................................................................................................ 6-8
6.4.1 Coils ........................................................................................................................... 6-8
6.4.2 Subsea pods .............................................................................................................. 6-8
6.4.3 Housings .................................................................................................................... 6-8

iv © Teledyne Limited DPN 402197 Issue 7.1
6.4.4 End caps .................................................................................................................... 6-8
6.4.5 Electronics .................................................................................................................. 6-9
6.4.6 Topside computer ....................................................................................................... 6-9
6.4.7 Altimeter ..................................................................................................................... 6-9
6.4.8 Cables ........................................................................................................................ 6-9
6.4.9 Other .......................................................................................................................... 6-9
7 System Specifications ............................................................................................................. 7-1
7.1 Specifications ..................................................................................................................... 7-1
7.1.1 Subsea Electronics Pod ............................................................................................. 7-1
7.1.2 Search Coil ................................................................................................................. 7-1
7.2 Performance ....................................................................................................................... 7-2
7.3 System Trials ...................................................................................................................... 7-3
7.3.1 Trials Configuration and Procedure ............................................................................ 7-3
7.3.2 Results ....................................................................................................................... 7-4
7.3.2.1 Accuracy ............................................................................................................. 7-4
7.4 Update Rate ....................................................................................................................... 7-6
A Operating Theory ..................................................................................................................... A-1
A.1 Electromagnetic Fields....................................................................................................... A-1
A.2 Field Detection ................................................................................................................... A-1
A.3 Signal Isolation................................................................................................................... A-2
A.4 Calculation ......................................................................................................................... A-2
B Options ..................................................................................................................................... B-1
B.1 Systems ............................................................................................................................. B-1
B.1.1 Coils ........................................................................................................................... B-1
B.1.2 Subsea pods .............................................................................................................. B-1
B.1.3 Topside computer ...................................................................................................... B-1
B.1.4 Altimeter..................................................................................................................... B-1
B.1.5 Cables........................................................................................................................ B-1
B.1.6 Other .......................................................................................................................... B-2
B.2 Dualtrack System ............................................................................................................... B-2
B.2.1 The Equipment........................................................................................................... B-2
B.2.2 The Differences.......................................................................................................... B-3
B.2.3 Scope of Delivery....................................................................................................... B-5
B.2.4 Physical Installation ................................................................................................... B-6
B.2.4.1 Search-coils ....................................................................................................... B-6
B.2.4.2 Subsea Pods ..................................................................................................... B-6
B.2.5 Electrical Connection ................................................................................................. B-7
B.2.5.1 System Configuration ........................................................................................ B-9
B.2.5.2 System Operation .............................................................................................. B-9
B.2.6 Power Supply Requirement ..................................................................................... B-10

DPN 402197 Issue 7.1 © Teledyne Limited v
B.3 Training ............................................................................................................................ B-10
C Cables and Tones .................................................................................................................... C-1
C.1 Tone Injection .................................................................................................................... C-1
C.1.1 Frequency Selection .................................................................................................. C-1
C.1.2 Connection to the cable ............................................................................................. C-2
C.1.2.1 Short cables....................................................................................................... C-2
C.1.2.2 Long cables ....................................................................................................... C-2
C.1.2.3 Fibre-optic cables .............................................................................................. C-3
C.1.2.4 General connection requirements...................................................................... C-3
C.1.3 Seawater Return Path ............................................................................................... C-3
D Coil Tester ................................................................................................................................ D-1
D.1 Pre-Operation .................................................................................................................... D-1
D.1.1 Coil Calibration Constants ......................................................................................... D-1
D.2 Operation ........................................................................................................................... D-2
D.2.1 Frequency Selection .................................................................................................. D-4
D.3 Fault Identification.............................................................................................................. D-5
D.4 Battery Replacement ......................................................................................................... D-5
D.5 Maintenance ...................................................................................................................... D-6
D.6 Specification ...................................................................................................................... D-6
E Reference.................................................................................................................................. E-1
E.1 Survey Details .................................................................................................................... E-2
E.2 System Configuration Details............................................................................................. E-2
F Index .......................................................................................................................................... F-1

vi © Teledyne Limited DPN 402197 Issue 7.1
List of Figures
Figure 1-1: Components of the HydroPACT 350 system ............................................................... 1-2
Figure 2-1: SEP mounting arrangement......................................................................................... 2-3
Figure 2-2: The coil array reference line......................................................................................... 2-4
Figure 2-3: Construction of the starboard coil triad ........................................................................ 2-5
Figure 2-4: Coil array mounting bar................................................................................................ 2-7
Figure 2-5: Coil separation reference marks .................................................................................. 2-8
Figure 2-6: 350 installation drawing................................................................................................ 2-9
Figure 2-7: Effects of altimeter horizontal offset ........................................................................... 2-10
Figure 2-8: System interconnection diagram................................................................................ 2-12
Figure 2-9: Simplified schematic of the current-loop .................................................................... 2-17
Figure 2-10: Link location on the SEP processor board ............................................................... 2-18
Figure 2-11: Link detail shown using the same orientation as in Figure 2-10 .............................. 2-19
Figure 3-1: System Configuration Wizard....................................................................................... 3-2
Figure 3-2: System Configuration Wizard - Summary .................................................................... 3-4
Figure 3-3: Threshold does not apply to vertical coils .................................................................... 3-5
Figure 3-4: Print Configuration ....................................................................................................... 3-7
Figure 3-5: DeepView - Run Window ........................................................................................... 3-11
Figure 3-6: DeepView - Forward Search Window ........................................................................ 3-14
Figure 3-7: Scope Window ........................................................................................................... 3-16
Figure 3-8: Spectrum Analyser Window ....................................................................................... 3-16
Figure 3-9: System Errors Window...............................................................................................3-17
Figure 3-10: Terminal Window ..................................................................................................... 3-18
Figure 3-11: Altimeter Configuration............................................................................................. 3-20
Figure 3-12: Altimeter Test ........................................................................................................... 3-21
Figure 3-13: External Output Configuration and Serial Port menu............................................... 3-22
Figure 3-14: Video Overlay Setup ................................................................................................ 3-23
Figure 3-15: Video Overlay Signal................................................................................................ 3-24
Figure 3-16: Video Overlay Enable/Disable button ...................................................................... 3-24
Figure 3-17: DeepView function keys........................................................................................... 3-26
Figure 3-18: Replay toolbar keys.................................................................................................. 3-27
Figure 4-1: Using the forward search mode ................................................................................... 4-3
Figure 5-2: ROV positioning errors................................................................................................. 5-2
Figure 5-3: ROV roll errors ............................................................................................................. 5-3
Figure 5-4: Sloping target ............................................................................................................... 5-4
Figure 5-5: Curved target ............................................................................................................... 5-7
Figure 6-1: Components of the 350 system ................................................................................... 6-1
Figure 6-2: Single channel failure................................................................................................... 6-4
Figure 6-3: Communications failure................................................................................................ 6-5
Figure 6-4: Poor tracking performance........................................................................................... 6-6

DPN 402197 Issue 7.1 © Teledyne Limited vii
Figure 6-5: Altimeter failure ............................................................................................................ 6-7
Figure 7-1: Vertical range measurement accuracy......................................................................... 7-2
Figure 7-2: Trials site...................................................................................................................... 7-4
Figure A-1: Lines of magnetic flux .................................................................................................. A-1
Figure A-2: Frequency ‘windows’ ................................................................................................... A-2
Figure B-1: Sub-sea components of the Teledyne TSS 350 System ............................................. B-5
Figure B-2: Sub-sea components of the Teledyne TSS 440 System ............................................. B-6
Figure B-3: Electrical interconnection of subsea components........................................................ B-7
Figure C-1: Tone injection – Short cables ......................................................................................C-2
Figure C-2: Tone injection – Long cables.......................................................................................C-2
Figure D-1: 350 System Parameters Configuration screen............................................................D-2

viii © Teledyne Limited DPN 402197 Issue 7.1
List of tables
Table 1-1: Components of the HydroPACT 350 system ................................................................ 1-2
Table 2-1: System interconnection diagram key .......................................................................... 2-12
Table 2-2: Power and communications cable............................................................................... 2-15
Table 2-3: Link settings for LK1 to LK5 ........................................................................................2-19
Table 2-4: RS232 connection to COM2........................................................................................ 2-22
Table 3-1: DeepView Menu Commands......................................................................................... 3-8
Table 3-2: System errors format................................................................................................... 3-18
Table 3-3: Terminal Window toolbar.............................................................................................3-19
Table 3-4: Altimeter configuration parameters ............................................................................. 3-20
Table 3-5: External Output Configuration ..................................................................................... 3-22
Table 3-6: Factory System Defaults .............................................................................................3-22
Table 3-7: DeepView Toolbar....................................................................................................... 3-24
Table 3-8: Run Window Toolbar................................................................................................... 3-25
Table 3-9: Replay toolbar function keys ....................................................................................... 3-27
Table 4-1: External Output format - Survey Mode.......................................................................... 4-6
Table 4-2: QC check code meaning – Survey mode...................................................................... 4-7
Table 4-3: External logging format – Forward search mode .......................................................... 4-8
Table 4-4: QC check code meaning – Forward Search mode ....................................................... 4-9
Table 4-5: Internal logging format – Survey co-ordinates............................................................... 4-9
Table 4-6: Internal logging format – Forward search mode.......................................................... 4-10
Table 4-7: Internal logging format – Signals packet ..................................................................... 4-11
Table 4-8: Altimeter output format – Benthos PSA 916................................................................ 4-12
Table 4-9: Altimeter output format – Teledyne TSS and Datasonics ........................................... 4-13
Table 4-10: Altimeter output format – Datasonics with pressure transducer................................ 4-13
Table 4-11: Altimeter output format – Ulvertech Bathymetric system .......................................... 4-14
Table 4-12: Altimeter output format – Simrad UK90..................................................................... 4-14
Table 4-13: Altimeter output format – OSEL bathymetric system ................................................ 4-15
Table 4-14: Tritech SeaKing Bathy format ................................................................................... 4-16
Table 6-1: Components of the 350 system..................................................................................... 6-1
Table 6-2: Connections to the coil cable ........................................................................................ 6-2
Table 7-1: Vertical measurement errors .........................................................................................7-5
Table 7-2: Lateral measurement errors ..........................................................................................7-6
Table B-1: Components of the Dualtrack system ........................................................................... B-5
Table C-1: Effects of tone frequency choice...................................................................................C-1
Table D-1: 350 System Subsea Parameters ..................................................................................D-3
Table D-2: 350 System Connector Cable Identification..................................................................D-3
Table D-3: 350 System Operating Parameters ..............................................................................D-4
Table D-4: Coil Tester Frequency settings and expected coil voltages..........................................D-5

DPN 402197 Issue 7.1 © Teledyne Limited ix
Revision History
Issue No. Date Details
7.1 January 2019 Service/support details and legal entity updated
7.0 November 2018 ECR 4535, plus scope of supply added.
6.0 July 2018 ECR 4529
5.1 March 2018 ECR 4512
5.0 December 2017 ECR 4507
4.0 October 2016 ECR 4438, plus updated DeepView screens.
3.5 February 2016 Minor update. SEP weight and dimensions updated. Figure 10-
12 updated.
3.4 June 2014 ECR 4242
3.3 November 2013 ECR 4187
3.2 October 2013 ECR 4172
3.1 June 2013 ECR 4108, and revised formatting
3.0 November 2012 ECR 3782.
2.6 June 2012 ECR 3762.
2.5 January 2010 ECR 3406.
2.4 15/01/2008 Added 350 Coil Tester section to Appendix E.
2.3 14/06/2007 Updated default comms to RS232.
2.2 16/02/2006 Corporate rebranding changes and SDC9 updates.
2.1 19/12/2003 Revised for latest software.
2.0 25/07/2000 First release to cover SDC8/DeepView/440.

x © Teledyne Limited DPN 402197 Issue 7.1
Glossary
Item Definition as used throughout this Manual
ALT Coil altitude above the seabed. This could be measured by a subsea altimeter con-
nected either directly to the SEP or through the umbilical to the topside computer.
Where there is no altimeter fitted to the system, ALT could contain a fixed coil height
that you specify during the configuration procedure.
COV Target depth of cover. DeepView calculates this distance by using COV = VRT – ALT.
CV Composite Video. This can be utilised in either NTSC or PAL formats.
LAT Lateral offset. The horizontal distance measured by the 350 system between the top of
the target and the centre line of the coil array. Positive measurements indicate a target
to starboard of the centre line.
PSU Subsea power supply pod. The depth rated unit that accepts an electrical supply from
the ROV and produces the conditioned and stabilised d.c. supplies used by the SEP.
ROV Remotely operated vehicle. Any form of sub-sea or surface vehicle supporting the 350
system during survey operations.
SDC Surface display computer. One of the configuration, control and display computer
options used to operate the 350 system.
SEP Subsea electronics pod. The depth rated unit that performs the measurement operation
on the target.
VRT Vertical range to target. The distance measured by the 350 system along a line perpen-
dicular to the coil surface, between the coil array and the closest point of the conductive
target.

1 – Introduction
DPN 402197 Issue 7.1 © Teledyne Limited 1- 1
1 Introduction
The HydroPACT 350 system is a turnkey solution for performing accurate submarine surveys on tone-
carrying cables. It operates in real time and provides accurate measurements at a rate that allows
deployment on board faster ROVs. The measurement technology used by the system also allows it to
operate out of water with no degradation in performance, range or accuracy. You may therefore use the
system for land-based or amphibious survey applications. The burial state of the target has no effect on
system operation.
This manual contains full installation and operating instructions and is an important part of the 350
system. You should ensure the manual remains easily available for use by those who will install,
operate and maintain the system.
1.1 Conventions used
This manual uses the following conventions that signal important Warnings, Cautions and Notes:
WARNING
A Warning indicates the risk of death or serious injury to personnel.
CAUTION
A Caution indicates the risk of injury to personnel, or damage to equipment, or
loss of data.
NOTE
A Note emphasises important information about the use of the product.
Throughout this manual, unless stated otherwise, all measurements conform to the SI standard of
units.
1.2 System Description
TSS has designed the HydroPACT 350 system primarily for use in surveying operations on submarine
cables. In this application the system measures, displays and records the position of the target relative
to the ROV, and its depth of cover beneath the seabed.
Operation of the system is unaffected by the burial state of the target cable, the presence of non-
ferrous metallic objects, or the heading of the search ROV.
Figure 1-1 shows a typical stand-alone configuration for the 350 system that has the topside computer
installed on a surface vessel and the subsea components mounted on the ROV. Table 1-1 identifies the
individual components of the installation.

1 – Introduction
1-2 © Teledyne Limited DPN 402197 Issue 7.1
Figure 1-1: Components of the HydroPACT 350 system
Table 1-1: Components of the HydroPACT 350 system
NOTE
Refer to Appendix B.1 for more information on options and how to order.
Item Description
ATopside computer with DeepView installed
BData cable for connection between the topside computerand the ROV umbilical
CPower and data cable (or ‘ROV Tail’) that connects the SEP to the ROV umbilical and power distribution
system
DSubsea electronics pod (SEP)
EPort and starboard coil connection cables
FPort and starboard coil triads. These each include three identical coils arranged so that the starboard triad is
a mirror image of the port triad
GAltimeter connection cable
HSubsea altimeter
Electrical Supply
Communications
A
B
ROV umbilical (user supplied)
D
E
F
C
E
FG
H

1 – Introduction
DPN 402197 Issue 7.1 © Teledyne Limited 1- 3
NOTE
Both topside computers have their own dedicated user manuals and these should
be referred to for specific information on installation, operation and maintenance.
During survey operations, the sub-sea installation measures the target co-ordinates. These are:
❐The vertical range to the target (VRT)
❐The lateral offset of the target relative to the centre of the coil array (LAT)
❐The altitude (ALT) of the coil array above the seabed, and the depth of target cover (COV). To
make these measurements, the 350 system must receive altitude information from an altime-
ter. Alternatively, where the design of the ROV allows for a constant coil height, you may con-
figure the system with this information instead.
❐The angle of skew (SKEW) between the target and the coil array.
❐The forward range to the target (FWD) when you operate the system in its forward search
mode. You must supply altitude measurements to the system for this feature to operate.
The SEP performs the signal processing functions necessary to generate accurate survey data with no
need for additional processing by the topside computer.
Optionally, you may use the 350 system as part of a Dualtrack installation. In this mode, a single
topside computer controls the operation of the 350 system when its subsea components are connected
to a TSS 440 Pipe and Cable Survey System. Refer to section B.1.6 for instructions to connect and
configure the 350 system within a Dualtrack installation.
1.3 Principle of Operation
The 350 system uses an array of six identical sensing coils arranged in two coil triads to detect the
alternating magnetic fields that surround a tone-carrying cable. The directional characteristics of the
individual sensing coils in each triad enable the system to locate the relative position of the target
cable.
The method used by the 350 system to locate and survey the target cable is insensitive to the effects
of:
❐Variations in the magnitude of tone current
❐Terrestrial magnetism
❐Burial condition of the target cable
❐The presence of non-ferrous metallic objects in the search area
1.4 Warranty
Please refer to your sales agreement with Teledyne Limited for information about the terms and
duration of the warranty for this product.

1 – Introduction
1-4 © Teledyne Limited DPN 402197 Issue 7.1
NOTE
Retain the original packaging to use when shipping this product between installa-
tion sites or when returning it to Teledyne Limited or an authorised distributor for
repair. The use of improper packaging for shipping any part of this equipment may
invalidate the warranty. For information about the proper return location and pro-
cedure, contact Teledyne Limited or an authorised distributor.
1.5 Product Support
For questions about installing your product or any other product operating enquiry contact our technical
support. See our website at www.teledynemarine.com/tss for more information.

2 – Installation
DPN 402197 Issue 7.1 © Teledyne Limited 2- 1
2 Installation
To gain the best performance out of the HydroPACT 350 system you must take care when you install
and connect it. This section includes the necessary information to help you identify suitable locations
for the various components of the system, and install and prepare the systems for use.
There are many different types and size of survey vessel and ROV, therefore the instructions in this
chapter represent a set of general guidelines and recommendations that experience has proved
effective.
2.1 Unpacking and Inspection
NOTE
Retain the original transit cases so that you may use them if you must transport
the 350 system for any reason. You will invalidate the warranty if you use improper
packing during transportation.
Upon receipt of the 350 system, check all items against the shipping documents. Perform a careful
visual examination of all sub-assemblies and inspect them for any damage that might have occurred
during transportation.
Notify Teledyne Limited immediately if there are parts or sub-assemblies missing from your shipment. If
you see any damage to the system, file a claim with the insurers and inform Teledyne Limited. The
cover of this manual lists the contact details for Teledyne Limited. Teledyne Limited also operates a
24-hour emergency telephone support line managed by trained and experienced technicians.
To avoid loss or damage to any components of the System, store all sub-assemblies safely in their
transit cases until you need to install them. Obey the environmental limits for storage listed in section 7
for all sub-assemblies.
2.1.1 Scope of Supply
Case 1: 350 Subsea Electronics Case
❐1 x Electronics pod
❐1 x PSU to ROV cable (3m)
❐1 x Universal detection support kit
❐2 x Triaxial cables (5m)
❐2 x USB drive (one containing user manuals and declaration of conformity, one containing
DeepView software)
Case 2: 350 Coil Array Case
❐7 x Coil assemblies
❐2 x Mounting blocks
❐8 x Coil clamps

2 – Installation
2-2 © Teledyne Limited DPN 402197 Issue 7.1
❐1 x 350 coil tester
❐Assorted fasteners
Case 3: SDC10 (optional) - see separate manual for scope of supply
Case 4: Altimeter (optional)
❐1 x ALT-250 altimeter
❐1 x ALT-250 cable (3m)
Loose:
❐1 x 350 coil mounting bar
2.2 Physical Installation
NOTE
For information on installing the topside computer refer to its dedicated user man-
ual.
2.2.1 SEP
NOTE
Do not open the SEP unless you need to change the communication method.
There is a nylon mounting block attached to the SEP. This block provides a safe and secure method to
mount the housing to the ROV frame.
CAUTION
Do not attempt to secure the SEP housing directly to the ROV framework without
using the mounting block. Omitting the mounting block may cause damage to the
surface of the housing, leading to corrosion.
The mounting block has machined slots that allow you to strap the complete housing and block
assembly firmly to the ROV frame. Stainless steel strapping is ideal for this purpose (see Figure 2-1).
It is safe to mount the SEP in any orientation.
Mount the SEP housing according to the following guidelines:
❐Eliminate any possibility of snagging or damage to the SEP housing by installing it inside the
outer limits of the ROV frame.

2 – Installation
DPN 402197 Issue 7.1 © Teledyne Limited 2- 3
❐Locate the SEP housing so that you may install the cables easily between the sub-assemblies
of the 350 system.
❐Do not apply sharp bends or other mechanical stresses to the cables during installation or
operation. Route the cables between the components of the sub-sea installation, and use plas-
tic clips to secure them to the ROV frame.
❐On small ROVs, position the SEP close to the centre of buoyancy to avoid upsetting the ROV
trim.
❐Tighten the mounting straps firmly so that the SEP housing cannot move under the influence of
ROV vibration or currents in the water.
Figure 2-1: SEP mounting arrangement
2.2.2 Coil Array
CAUTION
The coils contain no user-serviceable parts. Do not open them.
When choosing a location for the coil array consider the following:
❐All vertical range measurements to the target position are relative to the coil reference line.
This line, shown in Figure 2-2, joins the centres of the port and the starboard lateral coils.
❐Measurements of lateral offset are relative to the centre of the coil array and are positive if the
target is to starboard and negative if it is to port.

2 – Installation
2-4 © Teledyne Limited DPN 402197 Issue 7.1
Figure 2-2: The coil array reference line
2.2.2.1 Assembling the coil array
The 350 system is supplied with both coil triads pre-assembled.
NOTE
Labels identify the port and starboard coil triads and indicate their correct mount-
ing orientation. The coil triads are NOT interchangeable. You MUST install them
on the ROV in their proper orientation. This installation detail is critical to the cor-
rect operation of the 350 System.
There are two numbers stamped onto the end cap of each sensing coil. These numbers are the four-
digit serial number and the five-digit calibration constant. Record these numbers for use during the
system configuration procedure described in section 3.2. Appendix E includes a suitable form to record
these details.
You will need to refer to the following coil re-assembly instructions only if you have disassembled a coil
triad – for example to fit a new a sensing coil.
To re-construct the coils after you have disassembled them you will need:
❐A 3mm hexagonal key
❐A 6mm hexagonal key

2 – Installation
DPN 402197 Issue 7.1 © Teledyne Limited 2- 5
Figure 2-3: Construction of the starboard coil triad
The following instructions describe the construction of the starboard coil triad (the port coil triad is a
mirror image of this).
1. Place the centre support block A on a clear, flat space. Turn the block so that there is a groove
running left-to-right on the top face as shown in Figure 2-3.
Fit the lateral coil first:
2. Insert an M5 × 12mm screw G into the hole near the centre of the top groove. Use a 3mm hex-
agonal key to tighten the screw lightly.
3. Turn the lateral coil C so that the 8-way connector is towards the left-hand side of the centre
block as shown. Place the coil into the groove so that the head of the M5 screw engages with
the recess in the coil body.
4. Place a clamping block B against the coil and insert four M8 × 50mm bolts F. Use a 6mm hex-
agonal key to tighten the bolts evenly until the block supports the coil properly. Do not over
tighten these bolts.
Fit the fore-aft coil:
5. Insert an M5 × 12mm screw into the right-hand groove of the centre block. Use a 3mm hexag-
onal key to tighten the screw lightly.
6. Turn the fore-aft coil D so that it is to the right-hand side of the centre block with its 8-way con-
nector pointing towards you as shown in Figure 2-3. Fit the coil to the groove so that the head