Raymarine ST50 plus Instruction Manual

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.

Nautech Limited, Anchorage Park, Portsmouth
PO3 5TD. England
Telephone [phone] I. Fax [phone]
DEPTH
Operation and
Installation
i

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
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
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ST50 plus Depth Operation and Installation Handbook
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ST50 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
C
.......................................... .
2.1 Connection to the Control Head
C
.......................................... -
m
2.2 Transducer Selection
C
...................................................... a
2.3Transducer Installation c
....................................................
J
Chapter 3: Fault Finding and Maintenance
............................. 13
3.1 FaultFinding ............................................................... .13
3.2 Maintenance
............................................................... 14
Chapter 4: Operation
..........................................................
15
4.1 DepthKey ..................................................................
.16
4.2AarmKey .................................................................... 18
4.3 Dffset Key
...................................................................
20
4.4 Reset Key
................................................................... 21
4.5 Display Contrast
...........................................................
22
Chapter 5: CODE Lock Security
.............................................
23
Chapter 6: Calibration
........................................................
27
6.1 initial Calibration ............................................................
28
6.2 Intermediate Calibration
.................................................
30
6.3 Extended Calibration
...................................................... 32
Chapter 7: General Specification
..........................................
35

ST50 Plus Depth Operation and Installation Handbook
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.

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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:
 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. Ihere-
fore, the control head must be sited where the rear case is
protected from contact with water.
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,’ ST!% plus Depth Operation and Installation Handbook
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.
5. Screw the two fixing studs (2) into the control head.
6. Pass the SeaTalk cable and transducer tails through the cable-boss (1)
clearance hole.
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.
ChaMer 1: Control Head Installation
Bracket Mounting
The ST50 Plus Depth can, as an alternative, be bracket mounted using the
Autohelm Mounting Kit.
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.
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ST50 Plus Depth Operation and ImtaUation Handbook Chapter I: Control Head Installation
1.3 Power Supply (stand-alone operation)
.I
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).
1.4 Power Supply (SeaTalk operation)
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 tails D,,,.
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.
Junction
box
rYeUowl
Screen J LRed J

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ST50 Plus Depth Operation and Installation Handbook
1.6 Ring Connection
Chapter 2: Transducer Installation
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.
Cable run upto 10m (3%)
Single connection: 13 instruments maximum
Second connection: 26 instruments maximum
Cable run upto 20m (66ft)
Single connection: 7 instruments maximum
Second connection: 13 instruments maximum
The second ringmain should be connected to the spare lead on the last
instrument in the chain and directed back to the circuit breaker.
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.
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.
To autopilot
SeaTalk BUS
Connection
To any further
ST50 Instruments
or Autopilot
Control Units “,,u-
Chapter 2: Transducer installation
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.
Transducer Type Hull Material
ZO91 Through Hull Plastic: GRP (Glass Reinforced Plastic), Steel and
Aluminium
Z118 Through Hull Bronze:
2120 Retractable througb
hull:
Wocd
GRP (Glass Reinforced Plastic), Steel and
Aluminium
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.

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ST50 plus Depth Operation and lnstallatin Handbook
Chapter 2: Transducer Installation
For accurate depth readings the transducer should be sited within the
shaded clear flow areas.
1 Sail 2 Plmningfxnw 3 Displacementpower
The transducer should also:
 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
Cabling
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.
I .
 have 1OOmm (4it-r) of headroom to allow for withdrawal
 within l@of the vertical, forward, aft and athwart shiis.

ST50 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
Instrument displays
‘CODELOCK set’,
ENTER CODE.
The ‘CODE Lock Enter correct code
feature has been set. number.
No exchange of SeaTalk cabling
information between problem.
SeaTalk instruments
tie, illumination levels).
Check securii of
SeaTalk connectors.
Remove instruments
one by one to isolate
faulty unit.
Failure of a group of SeaTalk
instruments in SeaTalk cabling/connector
chain. problem.
Check security of
SeaTalk connectors
between functioning
and nonfunctioning
instruments.
Depth reading Transducer Check cabling and
continuously flashes cable/connector securii of transducer
@e;th greater than 3 problem. connector.
Depth reading flashes Aereated water, boat Normal reading will
while underway. wakes, propellor wash return when clear of
etc. disturbed water.
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ST50 Plus Depth Operation and installation Handbook
Chapter 4: Operation
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.
Transducer
Refer to the Installation and Maintenance instructionssupplied with the
transducer.
Cabling
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.
ChGptX 4: OptHSkBi
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
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.

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ST50 Plus Depth Operation and lmtanation Handbook
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MINIMUM MPll I
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 Contrast
The display contrast is automatically adjusted when the tights are turnedon.
Fathoms
Whentheun’ksofmeasurearesettofeet,fathomswillbedisplayxdbefore
minimum depth.

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ST50 Plus Depth Operation and Installation Handbook
I
MEP
ALARM
ANCHOR LOW
ALARM
ANCHOR HIGH
AU\RM
Chapter 4: Operation
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
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.

ST50 J&s Depth Operation and installation Handbook Chapter 4: Operaibn
A 7 ncLJ Ltd...
-r.u VII~GC nGy
m m- .--
4.4 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 NotesReset 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.
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.
et,55
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22 . ,,’
ST50 Plus Depth Operation and lnstaiiation Handbook
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Chapter 5: CODE Lock Security
4.5 Display Contrast
The contrast can be adjusted to achieve optimum legibility at any angle.
-Decrease
-contrast ratio
1. Momentarily press DEPlH and ALARM together.
C’napter 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:
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.
r
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.

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ST50 Plus Depth Operation and Installation Handbook
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.
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.
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:
Chapter 5: CODE Lock Security
25
Once Only Entry
Action Display Shows
1 Press and DEPTH and ALARM together for CAL after 2 seconds and
4 seconds VER X.X after 4 seconds
2 Press DEPTH twice CODELOCK Cal. Off
3
4 seconds after CODELOCK Cal. Off
ENER CODE
4 Press ALARM
I I
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5Press OFFSET or RESET to select first 1 ___
number
6 Press ALARM to accept number
l’,‘- -
7 Press OFFSET or RESET to select second 1 2 __
number
8
Press ALARM to accept number
1 2’-‘-
9 Press OFFSET or RESET to select third 123-
number
10 Press ALARM to accept third number 12 3-l
11 Press OFFSET or RESET to select fourth 1234
number
12 Press ALARM to accept code ‘1234
13 Press ALARM
FWR ON?
14 Leave PWR ON? flashing for 10 seconds CODELOCK Cal. set
15 To save code, press DEPTH and ALARM Normal operation, eg.
together for 2 seconds depth display
Tlvx
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
Once only ‘CODE Lock’ entry is invisible once it has been set.

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ST50 plus Depth Dperation andlnstallation Handbook
Chapter 6: Calibration
27
On i;ower-Up
Chapter 6: Calibration
Action Display Shows
1
Press and DEPTH and ALARM together for CAL after 2 seconds and
As it leaves the factory the ST50 flus Depth is set to dispfay depth u&s in
4 seconds VER X.X after 4 seconds feet. These settings, together and other navigational features, can be
2 Press DEPTH twice
CODELOCK Cal. Off
changed (e.g., Feet to Metresjas described in this section.
3 4 seconds after CODELOCK Cal. Off ENTER CODE
4 Press ALARM
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5
Press OFFSET or RESET to select first 1 ___
number
6 Press ALARM to accept number 1’~‘- -
7Press OFFSET or RESET to select second 1 2 __
number
a Press ALARM to accept number 1 2’-‘-
9
Press OFFSET or RESET to select third 123-
number
10 Press ALARM to accept third number
1 2 3’-’
11 Press OFFSET or RESET to select fourth 1234
number
12 Press ALARM to accept code ‘1234
13 Press ALARM
PWR ON?
14 Press ALARM within 10 seconds
CODELOCK Cal. set
15 To save code, press DEPTH and ALARM Normal operation, eg.
together for 2 seconds 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.

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Chapter 6: Calibration
6.1 Initial Calibration
SHALLOW AlAf3M
J
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.