AUTOHELM 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.

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Operation and
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ackage Contents
The following items are included in the ST50 Plus Wind package:
1. ST50 Plus Wtnd control head
2. Fixingstuds (2 offI
3. Thumb nuts (2 oftI
4. Fitting template
5. Power cable
6. Masthead transducer
7. Control head cover
8. Junction box
9. Operation and Installation handbook
10. Worldwide Service Centre handbook
11. Warranty document

contents
.........................................................................
1
Chapter1:ContmIHeadlnstallation.. .......................................
.3
1.1 Sing ........................................................................... 3
1.2 Mounting Procedure ........................................................ 4
1.3 Power Supply (stand-alone operation) .................................. .6
1.4 Power Supply (SeaTalk operation)
....................................... 6
1.5 Connection of Separated Instruments
.................................. .7
1.6 Ring Connection .............................................................. 8
1.7 Connection to SeaTalk Compatible Autopilots ....................... .8
Chapter2:Transd~lnstaUation
............................................
9
2.1 Connection to the Control Head
........................................... 9
2.2 Masthead Transducer Installation
........................................ 9
Chaptw3:FaultFindingandMaintenance
................................ 11
3.1 Fat&Finding..
.............................................................. .ll
3.2 Maintenance
................................................................ .12
chapwkoperation ...........................................................
13
4.1 True/ApparentWlnd Selection
.......................................... 14
4.2 Illumination
..................................................................
14
Chapter 5: CODE Lock Security
.............................................
15
5.1 SecurityCode
..............................................................
15
Chapter 6: Calibration ..........................................................
17
6.1 Initial Calibration
............................................................ 18
6.2Extended Cabration
......................................................
20
Chapter7:General Specitication
............................................
23
Chapter8: CloseHauled)AlG .............................................. .25
8.1 Package Set
................................................................. 25
8.2 Operation .................................................................... 26
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Introduction
The ST50 Plus Wind instrument features a 360 degree apparent wind scale
and a sensitive yet stable needle drive that delivers accurate information under
even the most demanding conditions.
The unit can be configured to operate as a master or a dedicated repeater unit.
When used as a master the unit displays data received directly from the
masthead transducer, whereas repeater mode displays wind information
already on the SeaTalk bus.
These instruments also incorporate a security feature to protect units
mounted in vulnerable areas, such as the cockpit, helm or mast.
Thank you for purchasing an Autohelm product. May we take this opportunity
to wish you years of trouble free operation.

Chapter 1: Control Head Installation
1lOmm (4.33in) 38.75mm (1.5in)
r-1 I~_24mm10.!35ini
1lOmm
(4.33ird
1.1 siting
The ST50 plus Wind is designed for above or below deck installation
where it is:
l Easily read by the helmsman
l Protected against physical damage
l At least 230mm (9in)from a compass
l At least 500mm (2Oin) from radio receiving equipment
l Accessible from behind for ease of installation and cable running.
CUiOll:
To prevent moisture forming on the display window, the unit
‘breathes’through a small vent in the cable boss. Therefore, the
control head must be sited where the rear case is protected from
contactwithwater.

The rear case is fitted with a foam gasket to form a water-tight seal between
the instrument and the selected installation face.
.2 Mounting Procedure
1. Make sure ibatthe selected location is clean, smooth and flat.
2. Apply the seffadhesiie template (supplied) to the selected location and
mark the centres for the fixing studs (21 and the cable boss (1).
3. Drilltio 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 (2ir-r) diameter
cutter.
5. Screw the two fixing studs (2) into the control head.
6. Pass the SeaTalk cable and transducer tails through the cableboss (1)
clearance hole.
7. Assemble the control head to the bulkhead and secure from behind using
the thumb nuts (3).
Bracket Mounting
The ST50 Plus Wind can, as an alternative, be bracket mounted using the
Autohelm Mounting Kii.
NO@.?:
Because the instrument breathes through the vent in the rear case, this bracket
is for interior use only.
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.

3 Power Supply (stand-alone operation)
5 Amp circuit breaker
12v supply
1. Connect the 2m (6ft.I power supply cable to the distribution panel.
2. Cut the cable to length and connect the red wire totbe +12V terminal and
screen to the OV terminal.
3. Cut back and insulate the yellow wire.
4. Protectthe circuitwith a 5Acircuitbreaker.
Note:
Longer runs to the power supply can be made using the 9m (3Oftl SeaTalk
Extension Cable (D131).
. Power Supply (SeaTalk qperation)
All instruments 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 the
adjacent instrument tails into the ST50 Plus tails.
To transducer
.r a ,
SeaTalk tails SeaTaik
tails ~,,3i
Separated instruments can be connected using one of the range of SeaTalk
Extension Cable. These cables are supplied with a SeaTalk connector fitted to
each end. A junction box can be used to join the cable if it is cut for easier
routing or shortening.
if preferred, any 2 core, screened cable conforming the following specification
may be used instead of the SeaTalk cable.
l 22 AWG, 2 core screened cable with a minimum copper area of 0.5mm2.
1.5 Connection of Separated lnstnments
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Yellow
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Junction
1 1 box
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‘-1 Screen-J LRed -I Ucreen
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Chapter 2: Transducer Installation
Installations with a large number of instruments on a SeaTalk bus may require
a second riigmain connection to the power supply breaker to prevent
excessive voltage drops. Whether a second ring main is required can be
determined from the following:
Cable run upto 1Orn (33ft)
Single connection: 13 instruments maximum
Secofd connection: 26 instruments maximum
Cablerun upto 20m(66ft)
2.1 Connection to the Control Head
The ST50 Plus Wind is supplied with a transducer cable tail and connector
which simply plugs into the 30m f10Ofbiransducer cable.
2.2 Masthead Transducer Installation
n
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.
Connection to SeaTalk Compaljble Autopilots
lf the installation includes a SeaTalk compatible Autopilot fhe 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
D1134-
For best performance the mounting block must be fixed to a horizontal
surface. lfthe mast top is not horizontal, make up a wedged packing piece (1).
1. W~the~readedendofthemountingblock(2)facingfoMlards,markthe
position of the two self-tapping screws.

2. Drill two holes using the 4mm (5/32in) drill bii (supplied).
3. Apply sealing compound to the bottom of the mounting block (2).
4. Secure the mounting block to the mast top using the two screws (4).
5. Tighten the locking ring (3) securely by hand.
Cabling
1. Cut the cable so that there is sufficient length to run from the masthead
f
iransducer to the below deck junction box.
I
2. Feed the cable down the mast -if the mast is deck stepped the cable
should be passed through the deck using a proprietary deck gland.
3. To allow for unstepping, connect the cable to the junction box close to its
entry into the vessel.
4. Run the cable from the junction box back to the control head.
5. Connect the control head and masthead transducer cable tails together.
Chapter 3: Fault Finding and Maintenance
Chapter 3: Fault 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 fault
arises with the ST50 Plus Wind, 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.
CL is displayed when CODELOCK security Correct code number
unit is powered on. system has been must be transmitted
activated. before unit will operate
No exchange of SeaTalk cabling Check security of
information between problem. SeaTalk connectors.
SeaTalk instruments fie,
illumination levels). 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
non-functioning
instruments.