Cable layout and interconnections. Simrad FX80

ಪಿಡಿಎಫ್

ದಾಖಲೆ

ಜಾಹಿರಾತು

Cable layout and interconnections

Topics

Read this first, page 46

Cable plans, page 47

List of FX80 cables, page 49

Installing the FX80 cables, page 51

Cable drawings and specifications, page 64

Basic cable requirements, page 68

977-00017011/1.0

Simrad FX80 Installation Manual

Read this first

Detailed information about cable specifications, termination and connectors is provided.

Unless otherwise specified, all cables are supplied by Kongsberg Maritime as a part of the FX80 delivery.

Detailed drawings are provided for relevant cables. Each drawing provides additional information, and may, when applicable, include minimum specifications, connector terminations and the required number of cores. Drawings are generally not provided for standard commercial cables. Cables fall into three categories.

1 System cables : These cables are provided by Kongsberg Maritime as a part of the

FX80 delivery.

2 Shipyard cables : These cables must be provided by the shipyard performing the installation, or the shipowner. It is very important that the cables used meet the minimum specifications provided in this manual.

3 Commercial cables : These cables may be provided by Kongsberg Maritime as a part of the FX80 delivery. They may also be included with third party items that are used with the FX80.

All electronic installations and corresponding wiring must be in accordance with the vessel's national registry and corresponding maritime authority and/or classification society.

Note

It is very important that all cables are properly installed and correctly terminated.

Observe the relevant regulations and work standards. Always leave enough cable slack close to system units and cabinets to allow for maintenance.

Only skilled and authorized personnel can install the FX80 cables.

Kongsberg Maritime accepts no responsibility for damage to the system, or reduced operational performance, when this is caused by improper wiring.

Before you install or maintain the FX80 cables, make sure that the AC mains circuit breaker for the system is switched off.

977-00017011/1.0

Cable layout and interconnections

Cable plans

Topside cable plan

The topside/bridge cables include those used to connect the FX80 Processor Unit and the display to each other, to AC mains power, and to external devices. One Ethernet cable connects the Processor Unit to the Bridge Control Unit.

A Display

B Processor Unit

C Bridge Control Unit

D Ethernet cable to optional second computer

E Third-wire deck cable to the slip rings on the winch

F Winch

G Third-wire trawl cable

977-00017011/1.0

Simrad FX80 Installation Manual

Trawl and Camera Unit cable plan

All the underwater units, including the DFS75 Sonar Head and the Camera Unit are connected by subsea cable to the Communication Hub inside the Trawl Unit.

A Third-wire trawl cable to the winch

B Trawl Unit (containing the Communication Hub and DFS75 Sonar Head

C Camera

D Lamp

E Cable from Communication Hub to DFS75 Sonar Head (inside the Trawl Unit)

977-00017011/1.0

Cable layout and interconnections

List of FX80 cables

A set of cables is required to connect the FX80 units to each other, and to the relevant power source(s). Additional cables are required to connect the FX80 to peripheral devices.

Cable

C10

C11

C12

C13

C14

C15

C16

C17

C18

Type From/To Minimum requirements

AC power cable

From display to AC power outlet 2 x 1.5 mm 2 + Ground

From Processor Unit to AC power outlet

2 x 1.5 mm 2 + Ground

From Bridge Control Unit to AC power outlet

2 x 1.5 mm 2 + Ground

Ground cable

From display to vessel ground

From Processor Unit to vessel ground

1 x 6 mm

Ground cable From Bridge Control Unit to vessel ground

From Processor Unit to keyboard

1 x 6 mm 2

Computer cable

Computer cable From Processor Unit to mouse

(or another similar device)

From Processor Unit to display Video cable

This is a commercial cable. The display cable is often physically attached to the display, and terminated in the “computer end” with a male connector. If the cable is not attached, it is normally provided with the display.

Ethernet cable

Remote Panel cable

Third-wire deck cable

Third-wire trawl cable

From Processor Unit to Bridge

Control Unit

From Bridge Control Unit to second Processor Unit (option)

From Bridge Control Unit to ship’s network

From Bridge Control Unit to

Remote Panel

From Bridge Control Unit to winch

From winch to Trawl Unit

Communication

Hub Ethernet cable

From Communication Hub to

DFS75 Sonar Head

Fourth-wire cable From Communication Hub to

Y-split cable

Y-split cable From fourth-wire cable to lamp and camera

CAT5-E STP (Shielded Twisted

Pair)

CAT5-E STP (Shielded Twisted

Pair)

CAT5-E STP (Shielded Twisted

Pair)

18 x 0.34 mm for 10 m

High-quality coaxial cable

(RG214)

Armoured coax cable (CB6000)

977-00017011/1.0

Simrad FX80 Installation Manual

Comments

It is very important that a high-quality Ethernet cable is used. You must use CAT-5E

STP (Shielded Twisted Pair) quality or better. If you use a cable with lower bandwidth capacity you will reduce the FX80 performance. Do not connect the Processor Unit to the Bridge Control Unit using an existing local area network (LAN).

977-00017011/1.0

Cable layout and interconnections

Installing the FX80 cables

Topics

Connecting the Bridge Control Unit cables, page 52

Preparing the fourth-wire cable, page 54

Connecting the Camera Unit cables, page 55

Connecting the pigtail cable to the third-wire trawl cable, page 56

Connecting the Communication Hub cables, page 62

977-00017011/1.0

Simrad FX80 Installation Manual

Connecting the Bridge Control Unit cables

When you connect the cables, make sure that they are all properly secured, and able to withstand the vibration and movements of the vessel.

Context

All the connectors and ports you need to get started are on the rear side of the Bridge

Control Unit.

A NMEA data input serial connector

B Third-wire deck cable connector

C Ethernet port

D Remote Panel connector

E Voltage selector switch

F Power socket

G Power switch

H Ground pin

WARNING

Beware of high voltages in the Bridge Control Unit. Do not open the unit. There are no serviceable parts inside.

Procedure

1 Connect a GPS to the Bridge Control Unit using a serial line.

Most Global Positioning System (GPS) receivers provide NMEA 0183 telegrams containing speed, heading and sailed distance as well as geographical latitude and longitude.

977-00017011/1.0

Cable layout and interconnections

a Connect an RS-232 cable to the nine-pin NMEA data input serial connector

(A). Make sure the pin signals are wired as follows.

• Receive signal Rx on pin 2.

• Transmit signal Tx on pin 3.

• Common Ground on pin 5.

b On the GPS system, wire as described in the relevant documentation.

c Make sure that the total length of the serial line cable does not exceed approximately 50 meters.

If a longer cable is required, you may need to use buffer amplifiers on the serial line.

2 Connect the third-wire deck cable from the winch to the third-wire deck cable connector (B).

3 Connect the Ethernet cable from your Processor Unit to the Ethernet port (C).

4 If you have a Remote Panel (optional), you can connect its cable to the Remote

Panel connector (D).

5 Select the correct voltage using the voltage selector switch (E).

Caution

You must change the input supply voltage on the Bridge Control Unit to match the ship’s mains power. Failure to select the proper AC Input Voltage to match the ship’s mains power may damage the Bridge Control Unit.

6 Connect the power cable from the AC power outlet to the power socket (F).

7 If your power cable is not earthed (does not have a ground wire), then you must connect a grounding cable from the dedicated ground pin (H) to the vessel’s ground in the fuse box (or other common grounding point).

Note

Another ground pin is located on the front of the Bridge Control Unit for your convenience.

977-00017011/1.0

Simrad FX80 Installation Manual

Preparing the fourth-wire cable

Before you can connect the Camera Unit to the Communication Hub in the Trawl Unit, you need to prepare the fourth-wire cable for use.

Prerequisites

• A non-stretchable rope (such as

Spectra ® or Kevlar ® ) with the same length as the fourth-wire cable.

• Duct tape

• Eight-inch strain relief

Context

The fourth-wire cable connects the

Camera Unit to the Communication Hub inside the Trawl Unit. On larger trawls, this cable can be very long.

The fourth-wire cable is provided by

Simrad.

Procedure

1 Attach the rope to the fourth wire cable using duct tape approximately every one meter.

2 Make sure that the total length of the rope is shorter than the length of the fourth wire cable.

This will allow the rope to take up the tension.

3 Roll up the fourth-wire cable onto a separate drum.

Important

Make sure that the block is sufficiently dimensioned to allow the fourth wire to run undisturbed through it during deployment and retrieval.

4 Tie the other end of the rope to the eight-inch strain relief.

Related topics

Installing the Camera Unit, page 42

977-00017011/1.0

Cable layout and interconnections

Connecting the Camera Unit cables

You must connect the fourth wire to the Camera Unit. The fourth-wire cable connects the Camera Unit to the Communication Hub inside the Trawl Unit. The fourth wire is terminated by a Y-split cable, which connects to sockets on the camera and lamp.

Prerequisites

• Spiral bundling wrap to protect cables

• Small wire mesh

• Dow Corning ® 4 electrical insulating compound

Context

The Camera Unit is the assembly that contains the underwater monochrome camera and the powerful LED lamp.

Note

There are several Camera Unit models available — the North American model is shown here.

A Lamp

B Camera

C Cable routing

D Y-split cable

Procedure

1 Connect the single end of the Y-split cable to the connector at the end of the fourth-wire cable.

977-00017011/1.0

Simrad FX80 Installation Manual

2 Connect the two Y-split cable connectors to the sockets on the camera and the lamp, and make sure they are properly fastened.

Caution

Grease the cable connector plugs with a light coating of insulating compound before mating. The 8-pin connector on the camera is fragile! Make sure you do not twist the connector when mating.

3 Install an appropriate spiral bundling wrap on the cables to protect them from chafing.

4 Position and lock down the cable-relief blocks on the frame (!).

5 Set the camera and lamp tilts and lock them down securely.

6 You may wish to wrap the entire frame in a small wire mesh to keep the fish out.

Related topics

Installing the Camera Unit, page 42

Connecting the pigtail cable to the third-wire trawl cable

Before you can connect the third wire to the Communication Hub in the Trawl Unit, you need to splice the third-wire trawl cable to the pigtail cable provided with the FX80.

Prerequisites

• The pigtail provided by Simrad as a part of the FX80 delivery

• Heat-shrinking tubes with diameters to fit the outer diameter of the pigtail cable and third-wire cable (minimum total length is 70 cm)

• Crimping sleeve with relevant set of pliers

• Tinned braid foil (length of approximately 30 cm)

• One tube with mastic

• Heat gun

• Isolation tape

• Multimeter

977-00017011/1.0

Cable layout and interconnections

Context

The third-wire trawl cable comprises a core conductor surrounded by a grounding shield.

Together, these form a coaxial cable. This coaxial cable is enclosed by a protective jacket and a flexible steel armour.

A Core conductor in the coax cable

Insulation

Shield

Protective jacket

Outer steel armour

It is very important that this splicing is done properly. The splice must be completely waterproof, and there must be no electrical short between the core conductor and the shield. The quality of this splice is vital for the operational performance of the FX80. There are many different third-wire cables available, and there are also many ways to splice the third wire to the pigtail. This procedure explains one method suggested by Simrad.

The trawl cable enters the Deployment Pack through a dedicated opening, and it is then supported by a strain-relief block in a special compartment. Both the core conductor and the shield in the third-wire trawl cable are connected to the pigtail provided by

Simrad. The other end of the pigtail cable is provided with a watertight plug, which is connected to the Communication Hub. The design will not allow you to plug this into the wrong socket.

Important

The third-wire trawl cable must enter the Trawl Unit using an external strain relief with the proper dimensions. This item is not provided by Simrad.

Procedure

1 Remove the insulation on the coax cable and the pigtail cable.

a Remove the outer steel armour on the third-wire trawl cable to access the coax cable. You need to free at least 20 cm of the coaxial cable.

We have seen that this is done using a grinder, but you must then be very careful.

b Once you have removed the outer steel armour, the metal edges will be very sharp. Lift these edges of the armour to access underneath it, and apply several layers of tape – under the steel armour – for protection. After that,

977-00017011/1.0

Simrad FX80 Installation Manual apply several layers of tape outside the steel armour and its edges to protect personnel and equipment.

c Remove the insulation on the coax cable (A), and fold back the grounding braid.

Observe the illustration. You need to free approximately 80 mm of the coaxial cable, and approximately 20 mm of the core conductor must be stripped.

d Remove the insulation on the pigtail cable (B).

Observe that the pigtail cable consists of one black and one white wire. The white cable is ground. In total you will need approximately 150 mm of cable.

Cut off and strip the two cables as shown in the illustration. It does not matter if the ground conductor is longer than necessary — it will be cut to fit later.

2 Thread the heat-shrinking tubes as follows.

• Onto the pigtail: One with a length of approximately 150 mm.

• Onto the third-wire trawl cable:

– First, one with a length of approximately 330 mm.

– Then, another one with a length of approximately 150 mm.

977-00017011/1.0

Cable layout and interconnections

3 Install the crimping sleeve.

a Take the stripped end of the black wire in the pigtail cable (B), and insert it into the crimping sleeve (C).

b On the third-wire trawl cable, insert the stripped core conductor into the other end of the crimping sleeve (C).

Make sure that the two cables are laying next to each other inside the crimping sleeve, and that as little as possible of the stripped wires are shown outside the crimping sleeve.

Tip

If you have problems inserting the two stripped cables, you may need to remove dust and metal shavings from inside the crimping sleeve. As an alternative, use a crimping sleeve with a larger diameter.

c Crimp the sleeve from the centre and towards the end alternately on each side of the centre. Turn the cable 180 degrees after every second crimping.

d Clean the remaining cable insulation on each side of the crimping sleeve.

4 Install the first heat-shrinking tube (150 mm) that you previously threaded onto the third-wire trawl cable.

a Pull over the heat-shrinking tube (D), making sure that it covers the crimping sleeve, and also reaches as far as possible over the insulation on each side of the sleeve.

Push the earthing braids on the coax cable well back.

Important

Make sure that you cover the crimping sleeve completely, and that no stripped conductors are visible.

b Shrink the tube (C) using the heat gun.

Keep the heat moving constantly to prevent overheating, and make sure that you heat the tube all the way around. Start in the centre of the tube. When it has shrunk, proceed towards each end, so that the glue is squeezed out. After heating, take a short break to let the tube cool down.

977-00017011/1.0

Simrad FX80 Installation Manual

5 Install the heat-shrinking tube (150 mm) that you previously threaded onto the pigtail cable.

a Pull over the heat-shrinking tube

(E), making sure that this tube covers both the pigtail wires, as well as approximately half of the first heat-shrinking tube (D).

b Shrink the tube (E) using the heat gun.

6 Connect the ground conductors on the coax and pigtail cables with mastic.

a Apply a thin layer of mastic (F) around the end of the first heat-shrinking tube (D).

Make sure that it covers a large part of the heat-shrinking tube as well as a good part of the coax insulation.

b Wind the ground conductor from the pigtail cable around the mastic.

c Push the cable screen from the coax cable

(A) over the mastic (F) and the ground conductor from the pigtail cable.

d Squeeze everything together to ensure good contact between the ground on the coax cable and the ground on the pigtail cable.

e Cut off excess ground wires, and make sure that no loose strands are left behind.

7 Wind tinned braid (G) tightly all over the joint.

Make sure that each turn overlaps the previous turn.

Press the end of the braid into the layer beyond, and remove any surplus.

Note

Make sure that the tinned braid is wound tight enough over the cable joint. This is important to ensure proper ground connection.

8 Clean the cables and the shrinking tubes properly.

977-00017011/1.0

Cable layout and interconnections

9 Install the final heat-shrinking tube (330 mm) that you previously threaded onto the third-wire trawl cable.

a Pull over the heat-shrinking tube and centre it over the joint.

Make sure that it covers the entire length of the previous heat-shrinking tubes and the tinned braid.

b Shrink the final tube using the heat gun.

10 Complete the third-wire trawl cable installation.

a Use a multimeter to measure the resistance between the two pins on the pigtail plug.

Important

The resistance should be infinite or very large. If the multimeter indicates a short circuit, you must cut both cables and start from scratch.

b Mount the strain relief to the third-wire trawl cable.

Use the strain-relief block that sits in a special compartment on the outside cover of the Deployment Pack to hold the cable in place. Place the strain relief so that the splice between the third-wire trawl cable and pigtail cable sits inside the Trawl Unit. If necessary, adjust the thickness of the third-wire trawl cable by wrapping tape tightly around it.

Related topics

Installing the Trawl Unit, page 39

977-00017011/1.0

Simrad FX80 Installation Manual

Connecting the Communication Hub cables

The Communication Hub interfaces with the Camera Unit, the DFS75 Sonar Head, and with the topside units via the third-wire trawl cable. The Communication Hub is installed inside the Trawl Unit’s Deployment Pack.

Prerequisites

• Dow Corning ® 4 electrical insulating compound

• Anti-seize compound

Context

You can access the Communication Hub through the opening in the front of the Trawl

Unit’s Deployment Pack.

Note

Later models of the Communication Hub have a sacrificial anode on the end cap and have connectors that are labelled for your convenience. An earlier model with a yellow thermoplastic sleeve covering the pressure housing is shown here.

A Pigtail connector

B Camera connector

C Auxiliary 1 connector for DFS75

Sonar Head

D Auxiliary 2 connector (for optional second sensor system)

E Indicator light for high voltage

Tip

When mating the cable connectors, push all the air out of the connection (you will hear a pop).

To avoid bending the pins, do not twist the cable connector when mating.

Make sure that you tighten the connectors properly.

Procedure

1 Grease all the Communication Hub connectors with a light coating of insulating compound.

2 Apply anti-seize compound to all stainless steel threading.

3 Connect the third-wire deck cable to the Communication Hub.

977-00017011/1.0

Cable layout and interconnections

a Slip your third-wire pigtail cable under the DFS75 Sonar Head.

Don’t bend the cable too tightly.

b Connect the third-wire pigtail cable to the two-pin pigtail connector (A).

4 Connect the Camera Unit’s fourth-wire cable to the camera connector (B) on the

Communication Hub.

The camera connector is opposite the pigtail connector and has a blue locking sleeve.

5 Connect the DFS75 Sonar Head to the Communication Hub.

a On the DFS75 Sonar Head, locate the green cable with the connector.

This cable is the power and telemetry cable for the Sonar Head.

b Connect the green cable to the Auxiliary 1 connector on the Communication

Hub (C).

6 Connect a dummy plug onto the Auxiliary 2 connector (D).

Related topics

Installing the Trawl Unit, page 39

Installing the Camera Unit, page 42

977-00017011/1.0

Simrad FX80 Installation Manual

Cable drawings and specifications

Topics

Ethernet cable, page 65

Fourth-wire cable - SubConn OM10M Communication Hub connector, page 66

Fourth-wire cable - MacArtney UK 4247, page 66

Fourth-wire cable - MacArtney Type 4588, page 67

977-00017011/1.0

Cable layout and interconnections

Ethernet cable

Most high speed connections are made using Ethernet cables. The FX80 must use T568B termination for RJ45 connections on both ends of the cable.

A Local Ethernet connection

B Connection on external network device

Ethernet cables are available commercially in different lengths, colours and categories. Normally,

CAT-5E and CAT-6 cables are used in local area networks with bandwidths exceeding 100 Mbit.

Note

It is very important that high-quality Ethernet cables are used. You must use CAT-5E quality or better. If you use cables with lower bandwidth capacity you will reduce the

FX80 performance.

For 100Base-TX connections only Orange, Orange-White, Green, and Green-White are required. No cross-over is required for 100Base-TX direct pier to pier connections with the FX80.

Minimum cable requirements

Not applicable. This is a commercial cable.

977-00017011/1.0

Simrad FX80 Installation Manual

Fourth-wire cable - SubConn OM10M Communication Hub connector

This 10-pin male connector on the fourth-wire cable plugs into the Communication Hub.

Inline cable colour code

• Pin 1 : Black

• Pin 2 : White

• Pin 3 : Red

• Pin 4 : Green

• Pin 5 : Orange

• Pin 6 : Blue

• Pin 7 : White/black

• Pin 8 : Red/black

• Pin 9 : Green/black

• Pin 10 : Orange/black

Fourth-wire cable - MacArtney UK 4247

This fourth-wire termination with a SubConn Connector connects to the camera. There are five twisted-wire pairs in this connector (A to E).

Pin Functions

• Pin 1 : Camera 0V (red/green pair)

• Pin 2 : Camera +48 VDC (red/green pair)

• Pin 3 : Lamp +48 VDC (blue/green pair)

• Pin 4 : Video + (red/blue pair)

• Pin 5 : Video - (red/blue pair)

• Pin 6 : Lamp 0V (blue/green pair)

• Pin 7 : Lamp Dim (red/green pair)

• Pin 8 : N/C (red/green pair)

• Pin 9 : RS485-A (red/blue pair)

• Pin 10 : RS485-B (red/blue pair)

977-00017011/1.0

Cable layout and interconnections

Fourth-wire cable - MacArtney Type 4588

This is an alternative fourth-wire cable, in case you cannot find the fourth-wire cable with five pairs. There are four twisted-wire pairs in this connector and no braided sheath.

Make sure that you use strain relief with this cable.

Pin Functions

• Pin 1 : Camera 0V (red/green pair)

• Pin 2 : Camera +48 VDC (red/green pair)

• Pin 3 : Lamp +48 VDC (blue/green pair)

• Pin 4 : Video + (red/blue pair)

• Pin 5 : Video - (red/blue pair)

• Pin 6 : Lamp 0V (red/green pair)

• Pin 7 : Lamp Dim (blue/green pair)

• Pin 8 : N/C

• Pin 9 : RS485-A (red/white pair)

• Pin 10 : RS485-B (red/white pair)

977-00017011/1.0

Simrad FX80 Installation Manual

Basic cable requirements

It is very important that all systems cables are installed correctly. All cables must be properly supported and protected, and all relevant precautions must be made to prevent unwanted noise.

Topics

Third-wire deck cable selection guidelines, page 69

Third-wire deck cable layout and spacing recommendations, page 69

Cable trays, page 70

Grounding of system cables, page 71

Third-wire deck cable installation guidelines, page 72

977-00017011/1.0

Cable layout and interconnections

Third-wire deck cable selection guidelines

The third-wire deck cable is relatively short, but runs through an extremely noisy environment. It may be the biggest contributor of system noise and can cause significant impairment of the telemetry link between the Sonar Head and Processor Unit.

We recommend using a high-quality telemetry cable, such as the RG214 coaxial cable or an impedance-controlled shielded twisted-pair cable. The chosen cable should be similar to those of antennas with carrier frequencies up to around 1 MHz.

The third-wire deck cable installed on fishing vessels is primarily coaxial, but twisted-pair cables have been used in a few cases. Each type of cable has its pros and cons. But, regardless of the cable construction, an overall shield is required to minimize noise.

Twisted-pair cables are the only effective means of minimizing noise from low-frequency magnetic fields (primarily originating from power cables). However, unshielded twisted-pair cables have limited effectiveness in rejecting noise at higher frequencies and should not be used. Shielding provides an electrically conductive barrier to prevent electromagnetic interference.

Coaxial cables have less attenuation and can be used over a wider range of frequencies than twisted-pair cables. Coaxial cables are most suitable for single-ended circuits with the outer shield grounded and acting both as a shield and as the signal return. To minimize noise, use a shielded coaxial (triaxial) cable with appropriate shield grounding techniques.

Third-wire deck cable layout and spacing recommendations

The following recommendations are based on the IEEE 518-1982 standard for situations where there are a large number of cables varying in voltage and current levels.

There are four noise susceptibility levels for cables. Noise susceptibility indicates how well the signal circuit can differentiate between undesirable noise and the required signal.

For example, data communication cables such as RS-232E, RS485, Ethernet, and xDSL have a higher noise susceptibility than power cables. In general, for a given cable the susceptibility levels are reciprocal to the radiated emissions levels.

The four noise susceptibility levels are:

• Level 1 (high) : Analog signals less than 50 V and digital signals less than 15 V (data communication cables fall into this category).

• Level 2 (medium) : Analog signals greater than 50 V and switching circuits.

• Level 3 (low) : Switching signals greater than 50 V and analog signals greater than 50

V. Currents less than 20 A are also included in this category.

• Level 4 (power) : Voltages in the range of 0–1000 V and currents in the range of

20–800 A (applies to both AC and DC circuits).

977-00017011/1.0

Simrad FX80 Installation Manual

All permanently installed cables associated with the system must be supported and protected along their entire lengths using conduits and/or cable trays. Electrical conduits are tubes used to protect and route electrical wiring. Cable trays are used to support insulated electric cables used for power distribution and communication. They must be manufactured from metal and be firmly grounded with complete electrical continuity throughout the length of the tray. The trays should also be fully covered to provide adequate shielding.

The separation distance required between a cable with high susceptibility and another cable with varying susceptibility will vary depending on how your cables are installed:

• Cables contained in separate trays

– Level 1 to Level 2 – 30 mm

– Level 1 to Level 3 – 160 mm

– Level 1 to Level 4 – 670 mm

• One cable contained in a tray and the other in a conduit

– Level 1 to Level 2 – 30 mm

– Level 1 to Level 3 – 110 mm

– Level 1 to Level 4 – 460 mm

• Cables contained in separate conduits

– Level 1 to Level 2 – 30 mm

– Level 1 to Level 3 – 80 mm

– Level 1 to Level 4 – 310 mm.

Cable trays

All permanently installed cables associated with the system must be supported and protected along their entire lengths using conduits and/or cable trays.

The only exception to this rule is over the final short distance (maximum. 0.5 meters) as the cables run into the cabinets/units to which they are connected. These short service loops are to allow the cabinets to move on their shock mounts, and to allow maintenance and repair.

1 Wherever possible, cable trays must be straight, accessible and placed so as to avoid possible contamination by condensation and dripping liquids (oil, etc.).

They must be installed away from sources of heat, and must be protected against physical damage. Suitable shields must be provided where cables are installed in the vicinity of heat sources.

2 Unless it is absolutely unavoidable, cables should not be installed across the vessel's expansion joints. If the situation is unavoidable, a loop of cable having a length proportional to the possible expansion of the joint must be provided. The minimum internal radius of the loop must be at least twelve times the external diameter of the cable.

977-00017011/1.0

Cable layout and interconnections

3 Where a service requires duplicate supply lines, the cables must follow separate paths through the vessel whenever possible.

4 Signal cables must not be installed in the same cable tray or conduit as high-power cables.

5 Cables containing insulation materials with different maximum-rated conductor temperatures should not be bunched together (that is, in a common clip, gland, conduit or duct). When this is impractical, the cables must be carefully arranged such that the maximum temperature expected in any cable in the group is within the specifications of the lowest-rated cable.

6 Cables with protective coverings which may damage other cables should not be grouped with other cables.

7 Cables having a copper sheath or braiding must be installed in such a way that galvanic corrosion by contact with other metals is prevented.

8 To allow for future expansion of the system, all cables should be allocated spare conductor pairs. Also, space within the vessel should be set aside for the installation of extra cables.

Grounding of system cables

All metallic cable coverings (armour, metallic sheathing and other protection) must be electrically connected to the vessel's hull at both ends except in the case of final sub-circuits where they should be connected at the supply end only.

Grounding connections should be made using a conductor which has a cross-sectional area appropriate for the current rating of the cable, or with a metal clamp which grips the metallic covering of the cable and is bonded to the hull of the vessel. These cable coverings may also be grounded by means of glands specially intended for this purpose and designed to ensure a good ground connection. The glands used must be firmly attached to, and in good electrical contact with, a metal structure grounded in accordance with these recommendations.

Electrical continuity must be ensured along the entire length of all cable coverings, particularly at joints and splices. In no case should the shielding of cables be used as the only means of grounding cables or units.

Metallic casings, pipes and conduits must be grounded, and when fitted with joints these must be mechanically and electrically grounded locally.

977-00017011/1.0

Simrad FX80 Installation Manual

Third-wire deck cable installation guidelines

When laying out and installing your third-wire deck cable, follow these recommendations to ensure electromagnetic compatibility performance of the FX80 system. Given the wide variety of ship types, your wiring method must be appropriate to the particular conditions encountered during your individual installation.

The third-wire deck cable is categorized as a “Level 1” in terms of susceptibility to interference (according to the IEEE 518 standard) and must satisfy the following installation requirements:

• If the deck cable crosses any other cables, then it must do so at a 90º angle to minimize noise coupling.

• If the deck cable runs parallel with other cables, then the spacing between these cables must follow the deck cable layout and spacing recommendations.

The third-wire deck cable should be installed as a single piece whenever possible. This ensures shield integrity over the cable run and eliminates the risk of significant mismatch in the cable impedance. If splices are unavoidable, then follow these requirements:

• Use the same cable type for all sections. Using different cable types or sizes may cause signal loss and slow data rates.

• Minimize the length of the splice and ensure that the shield is restored over the splice area. Ensure that the shield on the spliced section is in full 360º contact with the shield at the end of the spliced section.

• Make sure that the shield is not grounded/earthed inadvertently at the location of the splice. The shield of the spliced deck cable should follow the same grounding technique as if it were a single piece.

Note

To prevent ground loop problems, your installation may require multiple shields. An outside shield (such as a braid, tray, or conduit) is grounded through extremely short jumpers at frequent intervals, and an inside shield is grounded at one point only. This technique ensures optimum shield grounding at both the low and the high end of the frequency spectrum.

977-00017011/1.0