Distributed by

Any reference to Raytheon or RTN in this manual should be interpreted as Raymarine. The names Raytheon and RTN are owned by the Raytheon Company.

_- _,_. _ _

ST50 SPEED
Installation and Operation
Nautech Limited, Anchorage Park, Portsmouth Hampshire, PO3 5TD, England. Telephone (0705) 693611, Telex 86364 NAUTEC G

Contents

1. 2. 2.1 2.2 2.3 2.4 2.5 2.6 2.7 3. 3.1 3.2 3.3 4. Specifications Control Head Installation Siting Mounting Procedure Power Supply Connection to Adjacent Instruments Connection to Separated Instruments Ring Connection Connection to SeaTalk Compatible Autopilots Transducer installation Connection to Instrument Transducer Selection Transducer Installation Fault Finding : 6 8
5. Maintenance 5.1 Control Head 5.2 Through Hull Transducers 5.3 Cabling 6. 6.1 6.1.1 6.1.2 6.2 6.3 6.4 6.5 7. 7.1 7.2 Operation Set Up Measurement Units Display Contrast Adjustment Illumination Display Sequence - SPEED Display Sequence - TRIP Display Sequence - TIMER Log Calibration Manual Calibration Automatic Calibration 15

1. Specifications

The ST50 Speed can be used as a stand-alone instrument or when connected to the SeaTalk bus can supply information to a Multi Function Display, a Tridata Repeater or any SeaTalk compatible Autohelm Autopilot. Both the Multi Function Display and Tridata Repeater have an NMEA standard output providing speed information to other onboard electronic equipment. The timer functions operate independantly allowing boat speed and log information to be displayed whilst the timer is running. Note: It is not possible to use the ST50 Speed as a repeater unit without a transducer input. When a dedicated repeater is required use the ST50 Multi Function Display. Specifications 0 Power Supply - 11V to 16V DC at 50ma (illumination off).

l Operating Temperature

2. Control Head nstallation
1 lhtn (4.33111) t--------c

39mm (1.5in)

Note: Tlie back cover is designed to breath through a duct in the cable boss to prevent moisture accumulation.
- 0C to t70c. 0 Size 1lOmm (4.33in) x 1lOmm (4.33in) x 24mm (lin) Overall depth 39mm (1.5in). 0 Computer - 8 bit Intel Microprocessor t 8K Rom. 0 Display - Custom dot matrix/7 segment liquid crystal display (LCD). l Boat Speed - 0 to 60 knots (depending on transducer). 0 Average Speed - 0 to 60 knots. l Maximum Speed - 0 to 60 knots, user resettable. Resets on powerdown. Log - 0 to 9999.9nm, promenantly stored. 0 Trip Log - 0 to 999nm, user resettable. Resets on powerdown. 0 Sea Temperature Timer - 0 to 100 hours countup. - 10 minute countdown. - 5 minute countdown. 0 Illumination - 3 levels and OFF, user selectable. 0 Unit Selection - Speed in MPH or knots, user selectable. - Distance in NM or statute miles, user selectable. 0 Distance Lost Function - Indicates distance lost during a Tack in either feet or metres.

2.1 Siting

The ST50 speed instrument is designed for above or below deck installation. Position where it is: 0 Easy to read by the helmsman. 0 Reasonably well protected from physical damage. 0 At least 230mm (gin) from a compass. 0 At least 500mm (20in) from radio receiving equipment. 0 Accessable from behind to secure in place and run cables. 0 Normally viewed straight on for best display legability.
2.2 Mounting Procedure (Fig. 1) The mounting surface must be smooth and flat. 0 Use the template provided to mark the centres of the two fixing holes and central boss. Note: Adjacent units should have a 6mm (1/4in) separation to allow room for the protective covers. 0 Drill to 4mm (5132in) diameter. 0 Use a 50mm (2in) diameter cutter to drill the hole for the central boss 1. 0 Screw the two fixing studs 2, into the back cover. l Pass the cable tails through the central hole and secure the instrument with the thumb nuts provided 3. (A sealing gasket 4 is already attached to the back cover).

Bracket Mounting (Fig. 2) As an alternative to surface mounting, a bracket mounting kit (Cat. No. 9130) is available to allow the Instruments to be bracket mounted.
- -10C to 40C (14 to 104F).

.3 Power Supply (Fig. 3)

0 I ransducer -w 11
2.4 Connection to Adjacent lnstruments (Fig. 4)
Fig. 4 To Transduce1 To Transducer ,cz-1,
Fig. 5 SeaTalkExtensionCable Cat. No. 0131 (9m (3011) supplied)

2.6 Ring Connection

insrarrarrons with a iarge number ot tnstruments on the SeaTalk bus may require a second ring main connection to the Power Supply to avoid excessive voltage drops. This can be checked using the table below:-

Ra lalk Tails

SeaTalk Tails
All instruments receive both power and information from the SeaTalk bus. Each instrument has two SeaTalk connectors (3 pm) on short 15Omm @in) tails to allow adjacent units to simply plug together.
Power %&y c&e 2m (6ft) Red Screen s12v ov
The second connection should be made to the spare lead on the last instrument and led back to the circuit breaker.
2.7 Connection to SeaTalk Compatible Autopilots (Fig. 6)
If the vessels installation includes a SeaTalk Compatible Autopilot the ST50 instruments may be connected into the SeaTalk bus at any point. No separate connection to the 12V power supply is necessary as the instruments will receive power via the bus from the autopilot course computer.
2.5 Connection to Separated htruments (Fig. 5)
Separated instruments are connected using the SeaTalk Extension Cable (Cat. No. 0131). This is supplied with a SeaTalk connector fitted to each end and with a junction box to rejoin the cable if it is cut to ease routing or for shortening. If preferred, any 2 core screen cable which has the following specification may be used in the place of the SeaTalk cable.
Minimum Copper Area Screen 2 Cores 0.5mm* 0.5mm2 AWG Computer BUS Scre
Jest installations only require one connection to he 12V power supply. This is connected to the first SeaTalk nstrument using the 2 metre cable supplied. Plug the connector into the instrument and ead the other end back to the vessels listribution panel. Cut the cable to length, :onnect directly to the distribution panel and jrotect with a 5A circuit breaker. Connect the ed wire to t 12V and the screen to OV. The ,ellow wire should be cut back and insulated. Longer runs to the power supply can be made rsing the SeaTalk Extension Cable (Cat. No. 1131) which is 9m (3Oft) long.

To any f&her ST50 Instruments or Autopilot Control Units
3. Transducer Installation
3.1 Connection to instrument c+.l. PTCn C.^^A I.^l._^. , L^ ^ &^.^A.^^ LOL,,JIJJ))GG 111311IIIT;IIt11(13a Ucl113Llx
cable tail with connector. Each transducer is supplied with 14m (45ft) of cable and the connector fitted on the end simply plugs into the instrument cable tail (Fig. 7).
3.3 Transducer Installation I^ ^,I ^^^^^ ^^A ,L^ :-^l.rl:,.^^ ^.^^ I:-A.:L. ,,I ai, MSCJ tww L,IC 1113LI LLllIzi 3)Jpllt? Wllll
the transducer completely before proceeding with the installation. Installation of the through hull type is described below. Siting (Fig. 8)
Fig. 8 Sailing Yacht [D +
Installation (Fig. 9) 1 n,;,, d111111 \I,ll, tJllL IIlC 111 LL- --1--1-J - I 111 q 3.,.m/t ,o;.\.:La L-I- :- LIK >t!:It%,tt position and check both inside and out that the siting is good. l Use a 50mm (2in) diameter cutter to drill the hole from the outside. l Emery to remove burrs and roughen the surface to provide a good key. Clean inside and outside the hull removing any grease with a weak solvent cleaner or household detergent.

Semi Displacement

Planing
4 Hole Size c 50mm (2in) Dia.
SPEED (2095) and Transducer

q--->

3.2 Transducer Selection
The speed transducers are selected depending on the hull material:-
For accurate readings the transducer should be positioned within the shaded area indicated where it will be in clear flow. 0 Be ahead of propellors (10% W.L. length min.). l Be at least 150mm (6in) from the keel (in a sailing yacht ideally ahead of the keel). l Be near the centreline. l Be clear of other through hull fittings or projections. l Have sufficient clearance inside the hull to allow the nut to be fitted. l Have 1OOmm (4in) headroom above the through hull fitting to allow it to be withdrawn.
Remove the paddlewheel assembly and nut from the through hull fitting 2 and apply sealing compound 3 to the mating flange and up the thread 6mm (114in) greater than the hull thickness. Assemble the through hull fitting making sure that the arrow points forward. Do not overtighten the nut 1. Remove excess sealing compound. Insert blanking plug ready for launch. Check for leaks immediately the vessel is launched. Recheck within 8 to 24 hours.
Cabling 0 Route the cable back to the instrument. 0 Avoid running the cable close to flourescent lights, engine, radio transmitting equipment etc. as these may cause interference. 0 Keep the cable clear of the bilges and secure at regular intervals.

4. Fault Finding

All Autohelm products are subject to a
mmnmhc.nciwa N,~~,.tact nrwnr(~~m.I. y.nrinr tn narkino r.A.1 r.-.O

5. Maintenance

5.1 Control Head a ,,I L&l Lcllll LIIILIIIJ, rn.A^.r^+:^. _^., - In ,.%4,.;,. ,.^.A:,:^-r cNIlGl1XUII CIJ
appear on the window. This will not harm the instrument, and can be cleared by switching on the illumination to the brightest level. 0 Never use any chemical or abrasive materials to clean your ST50 Speed Instrument. If the instrument becomes dirty wipe clean with a damp cloth. 0 Periodically check the through-hull fitting for leaks. 0 Keep the O-rings of the Speed/Log transducer and plug well covered with Vaseline ensuring plug is always attached to transducer, ready for immediate use. 0 Always replace the Speed/Log transducer with the plug whenever the vessel is being hauled out or left for long periods. 0 Frequently check Speed/Log transducer for fouling or damage. 0 Clean the outside of the through hull fitting flange, or external transducer face with a stiff brush and protect with a single coat of antifouling. Clean the paddle-wheel and exposed end of Speed/Log transducer plug and apply single coat of anti-fouling.
and shipment. In the unlikely event that a fault does arise the following check list should help cure the problem.
Fault Instrument Display Blank Course No Supply Action Check Supply Check Cabling and security of SeaTalk Connectors Check Fuse/Breaker Return ST50 Speed for repair Check Cabling and security of Transducer Connector Clean Paddle Wheel Check security01 SeaTalk Connectors. Remove Instruments one by one to isolate faulty unit Check security of SeaTalk Connectors between functioning and nonfunctioning Instruments
5.3 Cabling I *,,AA r,,nn;n,Tr~L.,nr +l.^.,nl, Kl,.A.^^ - nlI,111111~~I~JI,II~11 lgG~r*,,cz,r;
5.2 Through Hull Transducers
possible and secure any coiled lengths at regular intervals. 0 Avoid running cables close to flourescent lights, engine, radio transmitting equipment etc. l Check cabling for chafing or damage to outer casing, replace where necessary and re-secure.
No Speed or Temperature Information No Speed Information No exchage of information between SeaTalk Instruments (i.e. illumination levels). Failure of a groupof the SeaTalk Chain Instruments in
Transducer Cabling Problem Transducer Paddle Wheel fouled SeaTalk Cabling Problem
Advice Should any difficulties arise, please consult Nautech Product Support Department in the U.K. or your own National Distributor who will be able to provide expert assistance.
SeaTalk Cabling/Connector problem

i. Operation

he ST50 Speed Instrument can be used as an rA;t.;A.ll mrA,.ln n r,.rn,-.r+,.,-4 +,-. n+L.*r 1IIclI IIIWIG I WllllGLlci LLIlcil lstruments to provide part of a fully integrated lstrumentation system which can be linked to ny of the Autohelm SeaTalk compatible utopilots.

6.1 Set Up

ihe Si30 Speeci is sei up ill iile iaciory io

Illumination

display speed in knots, distance in NM, and distance lost in feet. These can be changed to mph, statute miles and metres to suit your preference as follows:l Push and hold down for 2 seconds Speed and Trip together to select calibration mode.
0 Push Reset to change display units between feet and metres. l Push and hold down for 2 seconds Speed and Trip together toexit calibration mode and store the selected units.
Control of Illumination level is common to all ST50 Instrument Modules. The control is always selected using the left-hand push button. 0 Push and hold down the Speed button for 1 second to switch ON (if OFF), or to display current illumination level (if already on).

nulaheln

.-a.-. : 0 L. ! :. : ! :.
6.1.2 Display Contrast Adjustment
The LCD viewing angle can be user set to achieve optimum display legability.

Cd. TRIP -. r-1 --

Momentarily push Speed and Trip together. 0 Push Speed button within 8 seconds to select required illumination level. Lamp 3 High Lamp 2 Medium Lamp 1 Low LampOFF O f f The display will return to previous status after 8 seconds.
6.1.1 Measurement Units I.tr:lii-i-KII:ii;l
Push Reset to change display units between knotsand mph. - nt,P Ll

i.*.i i.;I i* *.!

Push Reset to increase and Timer to decrease the contrast level. 0 Adjust for optimum contrast. 0 Momentarily push Speed and Trip together to store the display setting. Note: Increasing the display setting will suit installations where the instrument is normally viewed from below.

1.: :.i. l?:

:.: ; :,
Push Reset to change display units between nautical miles and statute miles.

TRIP i 1

Decrease K;ast
6.3 Display Sequence: SPEED
Tack / i fIi i:-:: i.;:: I
6.5 Display Sequence: TIMER

( IPCCD n

Boat Speed
.!.*.,. ,. j.j.:.* j.: :. j. : ::j

::.- ,*. 1 *.

Trip Distance.: :.* : :,

-4 -I I.3

- Push Reset for 4 seconds to reset.
When in Tack mode the ST50 speed instrument gives a measure of lost distance during a tack based on the average speed over the last 30 seconds. Push Reset just before starting the tack to start the distance lost function.

-.-.__-

Timer.:. : :.; :.. :. i j : j j. c. i. i I. : : :.,.: i.,a 17 ,) 17 L!!,r,r r,( - Push Timer to start/stop. - Push Timer to freeze display (indicated by flashing colon).

Velocity Made Good 0 Log

.;.j* j.::l ::.*: :***; ?.

TRIP II

RtSlr I -1. :.; :. i i-3 :. is,:. I.i-.:-.------e;.: : *.-i *.--*. :- p*., ji y. I-.: 1 :. 1 j.j :, : : : j. :i.e.: *. * : :. :. i :.,: :. II

1. : *

1 !;I *: : a. 1

*.::*::-J

Race Timer _._, ~. :-, f ::I! p [.-I --.:-.-. ~~.?.?._L- _-.--
- only displayed if wind data available. l Average Boat Speed* ,____ -. ~~-~~~ _ ~~ :.:. ,. i-i j> j.: : -. j-j.*. L**.j : *, !. B- 87 a.3

I-._._ _~~.~_~ ~. ,

L ---1

Sea Temperature

a Tack the boat - The distance lost will now count up until the boat reaches its average speed on the previous tack. 0 Push Reset to reset the function ready for the next tack. Note: The tack function should be reset at least 30 seconds before tacking so that the average speed can be accurately calculated.
- Push Timer for 1 second to select 10 minute countdown. - Push Timer for 3 seconds to select 5 minute countdown. 0 Push Reset at anytime to reset.
- Push Reset to reset. - Average speed is calculated over a max. 24 hour period after reset and then flashes.
.:*. : :*.: :.*.I ] *., j j : j.**. j. j I ,-, ;-, I ! L., ,;,:.*.*

Maximum Speed.- ---

j *<. :. ::. :.: j ,-j.,.j :* *.* *: p. j: -.: ! :: :: : 7 -4. L I

,,I.Lt

Note: If timer is already running, use Timer to return to timer display.
- Push Reset to reset. *Display returns to current boat speed after 8 seconds.

,--. ___-_.

- ,. ,. _.

2. Log Calibration

As supplied all ST50 Instrument Modules are Tested and Calibrated to factory standards. It is Navigation purposes the following Log Calibration procedures are carried out for your specific installation. There are two methods of log calibration. 0 Manual Calibration - allows a calculated log calibration factor to be entered manually. 0 Automatic Calibration - allows up to four measured runs to be entered and compared against a known distance. The log calibration factor is automatically calculated.
imwwtnnt.that hafnrn r.a.I.-. WV._ 1tcino.D thic.,._. -.-. fnr --.- inctrlmxd.I.
7.1 Manual Calibration Procedure

Calculate Correction Factor(F). I/^^.. A:^*.,.F = ~wm~!~!ea~~ Measured distance Known distance - From a chart Measured distance - As recorded on speed instrument allowing for tidal flow as required.
7.2 Automatic Calibration Procedure
6 Seieci an easiiy ideniiiied marked measureci distance on a chart. 0 Carry out the calibration when tidal flow is least. 0 Complete a minimum of two runs (one in each direction) to cancel tide. Procedure Push and hold down for 2 seconds Speed and Trip together to select calibration mode, (______ ---. _~._

:-*. ; *.*.-a. ::i ii i.

At the start of the measured run push Speed Display shows run number and measured distance wrm I 1
Procedure l Push and hold down for 2 seconds Speed and Trip together to select calibration mode.
:a**.-. : : :: * *. r-l i.

SPIED I.I

L--.--- _-._---.I

WEID I I

Push Speed at the end of the run. - Display shows recorded distance for the run, and after 5 seconds the log calibration factor.
0 Push Speed to display log calibration factor.
Push Speed to select log calibration.
0 Calculate the new log Calibration Factor. = Displayed calibration factor x F (min. 0.25, max 1.50).
0 Push Speed to display distance. Repeat last two stages to run the measured distance in the opposite direction. 0 If required, repeat last two stages for up to 2 more calibration runs over the measured distance. 0 Push and hold down for 2 seconds Speed and Trip together to exit calibration and to store the new log calibration factor.
0 Adjust the displayed calibration factor using Reset to increase ( A ) or Timer to decrease ( T ). l Push and hold down for 2 seconds Speed and Trip together to exit calibration and to store new calibration factor.

L--.--

0 Adjust displayed distance using Reset to increase ( A ) and Timer to decrease (7 ), until it equals marked measured distance (minimum 0.25nm, maximum 2.50nm).
Note: If the calibration factor is not within 0.25 and 1.50 a mistake has been made in the calibration sequence and the previous calibration factor will be retained when exiting calibration mode. The trip distance will be lost whenever automatic calibration is used.

Distributed by

Any reference to Raytheon or RTN in this manual should be interpreted as Raymarine. The names Raytheon and RTN are owned by the Raytheon Company.
DEPTH Operation and Installation
Nautech Limited, Anchorage Park, Portsmouth PO3 5TD. England Telephone (0705) 69361 I. Fax (0705) 694642
ST50 Plus Depth Operation and Installation Handbook
Autohelm and SeaTalk are registered Trade Marks of Nautech Limited Autohelms policy of continuous improvement and updating ma); change product specifications without prior notice Copyright Nautech 1993
ST50 plus Depth Operation and Installation Handbook ST50 plus Depth Operation and Installation Handbook

Package Contents

The following items are included in the ST50 Plus Depth package: 1. ST50 Pius Depth control head 2. Fixing studs (2 offI 3. Thumb nuts (2 oftI 4. Fitting template 5. Power cable 6. Depth transducer (through hull) with 14m(45ftI of cable 7. Control head cover 8. Operation and Installation handbook 9. Worldwide Setice Cenb-e handbook 10. Warranty document 11. Security code sticker

I ! ! ! / ! I 1 I

Plus Depth Operation and Installation Handbook

Contents

Introduction... Chapter 1: Control Head Installation... 1.1 Sing... 1.2 Mounting Procedure... 1.3 Power Supply (stanchalone operation).. t 1.4 Power Supply (SeaTalk operation). ;.. f 1.5 Connection of Separated Instruments.. ; 1.6 Ring Connection... I 1.7 Connection to SeaTalk Compatible Autopilots. I Chapter 2: Transducer Installation.. 2.1 Connection to the Control Head.. m 2.2 Transducer Selection.. 2.3Transducer Installation.. Chapter 3: Fault Finding and Maintenance.. 3.1 FaultFinding... 3.2 Maintenance... Chapter 4: Operation... 4.1 DepthKey... 4.2AarmKey... 4.3 Dffset Key.. 4.4 Reset Key.. 4.5 Display Contrast... Chapter 5: CODE Lock Security.. Chapter6: Calibration... 6.1 initial Calibration.. 6.2 Intermediate Calibration.. 6.3 Extended Calibration.. Chapter 7: General Specification..

a c J 13.15.35

ST50 plus Depth Operation and Installation Handbook

Intmduction

The ST50 Plus Depth is a SeaTalk compatible, multifunction instrument that employs a powerful echo sounder to give excellent performance over a wide range of sea conditions. Deep, shallow, anchor watch alarms can be set to provide visual and audible warnings when the water depth reaches selected thresholds. The ST50 Plus Depth can be configured to operate as a master unit or a dedicated repeater. Al settings are stored in permanent memory and retained even when the power source is disconnected. The ST50 Plus Depth also incorporates a securii feature to protect instruments mounted in vulnerable areas such as the cockpit, helm or mast. Thank you for purchasing an Autohelm product May we take this opportunity towishyouyearsoftroublefreeoperation.
ST!50 Plus Depth Operation and htaliation

Handbook

Chapter 1: Confrol

Head Installation

Chapter i: Coniroi i-&j ins&&h
r llOmm(4.33in) r, 38.75mm (1.5in)

1.1 Sing

The ST50 Plus Depth is designed for above or below deck installafion where it is:

l l l l l

Easily readable by the helmsman Protected against physical damage At least 230mm (gin) from a compass At least 5&m (20in) from radio receiving equipment Accessible from behind for ease of installation and cable running

Caution: To prevent moisture forming on the display window, the ST50 Plus Depth breathes through a small vent in the cable boss. Iherefore, the control head must be sited where the rear case is protected from contact with water.

_.-.- ___^_

._.- ____,_.- -- -.
, 4 , ST!% plus Depth Operation and Installation Handbook ChaMer 1: Control Head Installation

Bracket Mounting

The ST50 Plus Depth can, as an alternative, be bracket mounted using the Autohelm Mounting Kit.
1 Cable boss 2 Fiiing studs 3lhumb nuts 4Gashet
1.2 Mounting Procedure 1. Make sure that the selected location is clean, smooth and flat.
2. Apply the self-adhesive template (supplied) to the selected location and mark the centres for the fHing studs (2) and the cable boss (1). 3. Drii two 4mm (5/32in) clearance holes for the fixing studs (2) through the bulkhead. Remove the template. 4. Cut the clearance hole for the cable boss (1) using a 50mm (2in) diameter cutter. Pass the SeaTalk cable and transducer tails through the cable-boss (1) clearance hole.

Flush Mounting

A flush mounting kii is available for installations where a flush mount is required or more desirable. Full installation instructions are provided with the kit.
5. Screw the two fixing studs (2) into the control head. 6.
7. Assemble the contiol head to tie bulkhead and secure from behind using the thumb nuts (3). Note: The rear case is fitted with a foam gasket to form a water-tight seal between the instrument and the selected installation face. Under no circumstances must silicone greases be applied to this gasket as an additional method of sealing-the silicone will expand and distort the rear case.

e--m._

--._-___
ST50 Plus Depth Operation and ImtaUation Handbook
Chapter I: Control Head Installation
1.3 Power Supply (stand-alone operation)
1.5 Connection of Separated lnsttuments
Separated instruments can be connected using one of the range of SeaTalk Extension Cables. These cables are supplied with a SeaTalk connecMitted to each end. Ajunction boxcan be used tojointhecableifitis cutforeasier routing or shortening. If preferred, any 2 core, screened cable conforming the following specifiMion may be used instead of the SeaTalk cable.
22 AWG, 2 core screened cable with a minimum copper area of 0.5mmz.
1. Connect the 2m (6ft.l power supply cable directly to the distribution W. 2. Cut the cable to length and connect the red wire to the +12V terminal and screen to the OV terminal. 3. Cut back and insulate the yellow wire. 4. Protectthe circuiiwith a SAcircuiibreaker. Longer runs to the power supply can be made using the 9m (3OftI SeaTalk Extension Cable D131).

Junction box rYeUowl

1.4 Power Supply (SeaTalk

operation)

Screen J L Red J
All instmrnents in a SeaTalk system receive power and information from the SeaTalk bus. Each instrument has two SeaTalk connectors (3 pin) on 15Omm (6in) tails. To supply power and information to the instrument simply plug adjacent tails into the ST50 Plus Depth tails.
:s. To transducer ,:: :. 1,. :.l.,

SeaTalk tails

SeaTalk
Chapter 2: Transducer installation

1.6 Ring Connection

Installations with large numbers of instruments on a SeaTalk bus may require a second ringmain connection to the power supply breaker to prevent excessive voltage drops. Refer to the foflowing list to determine whether a second ring main is necessary.
Chapter 2: Transducer Installation
2.1 Connection to the Control Head
The depth transducer is supplied, as standard, with a through hull fling and 14m (45ftI of cable. The cable is equipped with a SeaTalk connector that plugs into a control head connector.

Cable run upto 10m (3%)

Single connection: Second connection: Single connection: Second connection: 13 instruments maximum 26 instruments maximum 7 instruments maximum 13 instruments maximum
Cable run upto 20m (66ft)
The second ringmain should be connected to the spare lead on the last instrument in the chain and directed back to the circuit breaker.
1.7 Connection to SeaTalk

Compatible Autopilots

If the installation includes a SeaTalk compatible Autopilot the ST50 instru ments may be connected to the SeaTalk bus at any point. No independent connection to the 12V power supply is necessary as the instruments receive power from the Autopilot course computer.

2.2 Transducer Selection

The type of depth transducer used is governed by the hull material. The following list shows the appropriate transducer for hull type.
To autopilot SeaTalk B U S Connection To any further ST50 Instruments or Autopilot Control Units ,,u-

Transducer

Hull Material GRP (Glass Reinforced Plastic), Steel and Aluminium Wocd GRP (Glass Reinforced Plastic), Steel and Aluminium
ZO91 Through Hull Plastic: Z118 Through Hull Bronze: 2120 Retractable througb hull:
2.3 Transducer Installation
All depth transducers are supplied with detailed installation and maintenance instructions. These instructions, together with the following notes, should be read thoroughly before attempting to install the transducer.
ST50 plus Depth Operation and lnstallatin Handbook

For accurate depth readings the transducer should be sited within the

shaded clear flow areas.

Cabling
1 Sail 2 Plmningfxnw 3 Displacementpower The transducer should also:
1. Run the cable back to the control head. Note: Avoid fluorescent lights, engines, radio transmitting equipment etc. as these may cause interference. Also, keep the transducer cable clear of the bilge and secure at regular intervals. 2. Fit the transducer and instrument cable connectors together. To lock the connectors, push and rotate the ring on the transducer cable connector towards the control head connector.
be ahead of the propeilers (loo/o W.L. length minimum) be at least 150mm (6in) away from the keel (ideally ahead of the keel if a sailing yacht) be as near as possible the centreline of the vessel be clear of other throughhull fttings or projections have sufficient clearance inside the hull to fit the nut have 1OOmm (4it-r) of headroom to allow for withdrawal within l@of the vertical, forward, aft and athwart shiis.

l l l l

plus Depth Operation and Installation Handbook
Chapter 3: Fault Finding and Maintenance
Chapter 3: Fauit Finding and Maintenance

3.1 Fault Finding

All Autohelm products are, prior to packing and shipping, subjected to comprehensive test and quality assurance programmes. However, if a fz arises with the ST50 Flus Depth, the following table will help to identify the probable cause and provide the most likely cure.
Fault Instrument display blank. Cause No supply. Action Check supply. Check cabling and security of SeaTalk connectors. Check fuse/breaker. Return unit for repair Enter correct code number. Check securii of SeaTalk connectors. Remove instruments one by one to isolate faulty unit. Check security of SeaTalk connectors between functioning and nonfunctioning instruments. Check cabling and securii of transducer connector.
Instrument displays CODELOCK set, ENTER CODE. No exchange of information between SeaTalk instruments tie, illumination levels).
The CODE Lock feature has been set. SeaTalk cabling problem.

SeaTalk Failure of a group of instruments in SeaTalk cabling/connector chain. problem.
Depth reading continuously flashes @e;th greater than 3 Depth reading flashes while underway.
Transducer cable/connector problem.
Normal reading will Aereated water, boat wakes, propellor wash return when clear of etc. disturbed water. IX

_._.,,.

ST50 Plus Depth Operation and installation Handbook

Chapter 4: Operation

ChGptX 4: OptHSkBi

lnslrument

Certain atmospheric conditions may cause condensation to form on the control head window. This will not harm the unit and can be cleared by increasing the illumination setting to Level 3. Chemical and abrasive materials must not be used to clean the control head; if it is dirty, clean with a soft, damp cloth. As it leaves the factory the ST50 Plus Depth is set with:
depth units in feet transducer off set set to 0 feet shallow alarm set to 10 feet deep alarm set to 100 feet low anchor alarm set to 50 feet high anchor alarm set to 50 feet
Refer to the Installation and Maintenance instructionssupplied with the transducer.
These settings can be changed in calibration, Chapter 6. When the unit is poweredup for the first time water depth will be displayed. Note: IfduringalOsecondperiodnovec~s~ereceived,t flash(ithedepthisgreatertban1OOftIaftera10seconddelaytoindiiate that the display is not being updated and that the currently cfrspkryedvalue was the last valid echo.
Examine all cables for chafing or damage to the outer shield and, where necessary, replace and resecure.

Advice

For advice, or further information regarding the instajlation of this product, please contact the Autohelm product Support Department or your own National Distributor.

-16. *,

ST50 Plus Depth Operation and lmtanation.-._ Handbook Chapter 4: Operation

.___-.

._.-.-.-__.___._
Depth Key Notes Minimum Depth
Minimum depth can be reset by pressing RESR: Minimum depth returns to current depth after 8 seconds.

Display Fathoms

Contrast
The display contrast is automatically adjusted when the tights are turnedon. Whentheunksofmeasurearesettofeet,fathomswillbedisplayxdbefore minimum depth.

MINIMUM MPll I

Aiarm iioies Shallow Alarm
The shallow alarm has priority over all alarms. The shallow alarm will sound until it is silenced, however, the shallow alarm legend continues to flash until the depth rises above the setthreshold.

Deep/Alarm

The deep alarm is triggered when crossing the set threshofd going from shallow to deep and deep to shallowwaters. Unless it is silenced, the deep alarm sounds for 30 seconds.

Anchor Alarms

The anchor alarms provide visual and audible warningswhen the water reaches critical low or high levels when the vessel is anchored. These alarms can be silenced, however, the visual alarm will continue to ffash until a safe water depth has been reached.

Silencing Audible Alarms

I MEP ALARM
Audible alarms can be silenced by pressing any key.
Enabling and Disabling Alarms
Afl alarms can be disabled. For further details, please refer to the calibration section.

ANCHOR LOW ALARM

ANCHOR HIGH AU\RM
ST50 J&s Depth Operation and installation Handbook

Chapter 4: Operaibn

A 7 ncLJ Ltd. -r.u VII~GC nGy

neset Key

Offset Key Notes
The off set value can be positive or negative: depih measured from the keel is negative and depth to the waterline positive. The offset display will return to water depth 8 seconds after the last key press

Reset Key Notes

This feature allows the depth uniis to be switched between feet and me&es. However, the units can only be toggled when the current water depth is displayed.

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ST50 Plus Depth Operation and lnstaiiation Handbook
Chapter 5: CODE Lock Security

4.5 Display Contrast

The contrast can be adjusted to achieve optimum legibility at any angle.

-Decrease

Cnapter 5: CODE Lock Security
The ST50 Plus range incorporates an anti-theft feature called CODE Lock. Designed to protect individual instruments or complete systems ir vulnerable areas, CODE Lock is a four digit number that you programmc into the permanent memory of a selected master instrument. Note: A master instrument is a digital unit on which the code number can be entered, and then, if part of an integrated system, transmitted to other ST50 Plus instruments. This facility means that, should a CODE Locked instrument be removed from a vessel without the owners permission, it cannot be operated without the four digit security number. CODE Lock can be used in one of three modes:

-contrast

1. Momentarily press DEPlH and ALARM together. 2. Press OFFSET or RESET to increase or decrease the contrast setting (the range being between 1 and 15). Note: A high setting will suit installations where the control head will be viewed from abow. 3. Press DEPTH and ALARM together momentarily to store the contrast setting.

Mode 1: Off

As it leaves the factory CODE Lock is set to off. In this mode the instrument will operate normally when it is switched on, however, the unit will not be protected by the anti-theft feature.
Mode 2: CODE Lock Once-Only Entry (page 25)
This mode is designed for systems with a digital ST50 plus instrument in -a safe, belowdecks location. This instrument can then be used as a master to enter the four digit code number, and automatically transmit the code to all the instruments in the system when the power is switched on. The advantage of this mode is that, with the master safely below deck, code entry via the keypad is a onceonly operation on installation.
Once CODE Lock is set the system will operate normally as soon as the power is switched on. In other words, the CODE Lock securii number is invisible.
Once Only Entry In the Power& mode, the ST50 Plus is configured so that you have to enter the four digit number on the master instrument every time the system is switched on. Until this number is entered the instrument(s)willnotoperate. This mode is particularly useful when you are unable to position a master instrument below decks and, therefore, all the vessels valuable instrlt mentation is left in a vulnerable area.

Action 11 Display Shows

Press and DEPTH and ALARM together for CAL after 2 seconds and 4 seconds VER X.X after 4 seconds Press DEPTH twice 4 seconds after CODELOCK Cal. Off Press ALARM Press OFFSET or RESET to select first number Press ALARM to accept number Press OFFSET or RESET to select second number Press ALARM to accept number Press OFFSET or RESET to select third number Press ALARM to accept third number Press OFFSET or RESET to select fourth number Press ALARM to accept code Leave PWR ON? flashing for 10 seconds To save code, press DEPTH and ALARM together for 2 seconds CODELOCK Cal. Off ENER CODE I I - --_ 1___ l,- 12__ 1 2-12312 3-l FWR ON? CODELOCK Cal. set Normal operation, eg. depth display Tlvx
Should a CODE Locked instrument be removed from the system, it will not operate until the correct four digit security number is entered or received. If your selected master instrument fails for any reason, the security code number can be entered via another ST50 Plus instrument in the system. However, until another instrument is set as a master or the existing master is replaced, the security code will have to be entered every time the system is switched on. Note: A warning sticker is provided with each instrument. If you have set Code Lock, position this warning sticker in a prominent location to deter potential thieves.

13 Press ALARM

If you do not exit CODELOCK Cal. set within 10 seconds, the display will change to CANCEL CODE. You now have the option of cancelling the code, by pressing ALARM to return to the _ _ __ display, or exit as described in action 15 above. Your Code Number For future reference, enter your chosen code number in the following box.
Setting Up the Security Code
When the ST50 Plus Depth is switched-on for the first time the security feature is set to off. To turn the CODE Lock feature on, proceed as follows:
For obvious reasons, please store this handbook in a safe place. Operation Once only CODE Lock entry is invisible once it has been set.
.,. _._._-_-__-. - , -&PA ~._ -_ _- _-._
ST50 plus Depth Dperation

andlnstallation

Chapter 6: Calibration
On i;ower-Up Action 7 Display Shows
As it leaves the factory the ST50 flus Depth is set to dispfay depth u&s in
feet. These settings, together and other navigational features, can be
Press and DEPTH and ALARM together for CAL after 2 seconds and VER X.X after 4 seconds 4 seconds Press DEPTH twice 4 seconds after CODELOCK Press ALARM Cal. Off CODELOCK Cal. Off ENTER CODE I I - - - 1___ 1~- 12 __ 1 2-3- PWR ON? CODELOCK Cal. set
changed (e.g., Feet to Metresjas described in this section.
Press OFFSET or RESET to select first number Press ALARM to accept number Press OFFSET or RESET to select second number Press ALARM to accept number Press OFFSET or RESET to select third number Press ALARM to accept third number Press OFFSET or RESET to select fourth number Press ALARM to accept code Press ALARM within 10 seconds To save code, press DEPTH and ALARM together for 2 seconds
Normal operation, eg. depth display T11Zl
If you do not exit CODELOCK Cal. set within 10 seconds, the display will change to CANCEL CODE. You now have the option of cancelling the code, by pressing ALARM to return to the __ _ _ display, or exit as described in action 15 above. Your Code Number For future reference, enter your chosen code number in the following box.
For obvious reasons, please store this handbook in a safe place.

Operation

When the unit is powered on you are prompted to enter the code number. To enter the number, carry out actions 4 to 12 and press ALARM.

6.1 Initial Calibration

Initial Calibration Notes Alarms
The shallow, deep, low anchor, high anchor and offset displays can be adjusted using the OFFSET and RESET keys. The ALARM key is used to enable/disablethe alarms. units Alternating between feet and metres is achieved by pressing RESIX

Exii Initial Calibration

To exit initial calibration and store the new settings, press DEPTH and ALARM together for 2 seconds.

SHALLOW AlAf3M

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ST60 plus Depth Operation and Installation Handbook Chapter 6: Calibration 3:
Intermediate Calibration Notes RepeaterMode
Repeater mode allows the ST50 Hus Depth to repeat speed related data already on the SeaTalk bus. There are two settings: O=disabled and 1 =enabled.
lnitialcalibrationcannotbeaccessedwheniheunitisconfiguredasarepeater.
Exit Intermediate Calibration
To exii intermediate calibration and store the new settings, press DEPTH and ALARM for 2 seconds.

SECURITY

-.- - -.ST50 Plus Depth Operation and installation Handbook Chapter 6: Calibration

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Extended Calibration Notes
All of the extended calibration screens are adjusted usingtbe WFSETand/or RESET keys.

Calibration

Calibration allows you to protect your selected settings. When calibration is enabled the initial and intermediate calibration settings cannot be modified. CAL0 = Calibration locked, i.e. no access CAL 1 = Calibration unlocked, i.e. normal access Once locked, calibration can be unlocked by entering extended calibration and selecting 1, calibration unlocked.

Depth Damping

Depth damping adjusts the rate atwhichfhe display is updated. The default setting is 4 seconds, however, the selectable range is 1 to 15.

Boat Show

The Boat Show mode is a dealer demonstration program only. Under no circumstances must this program be engaged when this unit is installed onboard your vessel.
Exii Extended Calibration
To store the extended calibration settings, press DEPTH and ALARM for 2 seconds.

DEPTH DAMPING

eration and lnstailation
Chapter 7: General Specification
Dimensions: Power supply: Power consumption: Temperature range: Depth: Shallow alarm: Deep alarm:
llOxllOmm(4.33x4.33inI lOtol6V 50ma (normal) lOOma WJfnination on)

0 to 70 deg.C

Offset:
Anchor alarm: Minimum depth function: Units: Damping: Repeater capability: Illumination:
Oto6OOfeet(Oto18Ometres) 3 to 33 feet (1 to 10 metres) 1Oto4OOfeet(3to12Ometfes) -9.9 to 9.9 feet (4 to 4 metres)
Oto6OOfeet(Oto18Ometres) Reset on powerup Software programmable feet/lathoms or metres

1 to 15 seconds

Software programmable 3levelsplusoff