AUTOHELM ST50 Wind Trim Instruction Manual

16 5T50
WindTrim and 5peedTrim Operation andInstallation Handbook
ST50 WlndTrlm and SpeedTrlm Operation and Installation Handbook
1
6. Specification
.
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• Power Supply
-11 v to 16v
• Current Consumption
- 90ma (illumination off)
- 215 ma (Maximum illumination)
• Operating Temperature
- 0 deg C to + 70 deg C
•
Size
- 110mm (4.33in) x 110mm (4.33in) x 24mm (l in).
Overall depth 39mm (1.5 in)
• Computer
- 8 bit Intel microprocessor + 8K Rom
• Display
- analogue +/-15%
-
digital 0- 60 kts
• Illumination
- 3 levels and Off with back lit display and pointer.
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Autohelm and SeaT alk are registered Trade Marks of Nautech Limited
Autohelms policy of continuous improvement and updating may change product specifications
without prior notice
Copyright Nautech 1993

2
ST50 WindTrim and SpeedTrim Operation and Installation Handbook ST50 WindTrim and SpeedTrim Operation and Installation Handbook
5.2 Locking on (ST50 Wind Trim)
15
To lock the instrument onto the current displayed value simply press lock.
This stores Apparent wind speed and direction and True wind speed and
direction. Each press of the LOCK button will now cycle through the
following information:
• Apparent Wind speed
• True Wind speed
• Apparent Wind direction
• True Wind direction
Any variation from the current and locked values will be indicated on the
analogue pointer as a percentage of the locked value.
The locked value can be changed by pressing the incremenVdecrement
key until the desired locked value is shown on the display.
Wind Speed units (Knots or m/s) will be the same as those on the Main
Wind instrument.
To return to the normal display press LOCK twice within 1 second.
5.3 Locking on (ST50 Speed Trim)
To lock the instrument onto the current boat speed simply press LOCK.
Any variation from the locked value will be indicated on the analogue
pointer as a percentage of the locked value.
The locked value can be changed by pressing the incremenVdecrement
key until the desired locked boat speed is shown on the display.
To return to the normal display press LOCK.

14
5. Operation
ST50 WindTrim and SpeedTrim Operation and Installation Handbook
ST50 WindTrim and SpeedTrim Operation and Installation Handbook
Contents
3
• Push and hold down the LOCK button for 1 second to switch on (If off), or
to display the current level of illumination (If already on)
Control of illumination levels is common to all ST50 instrument modules.
The control is always selected using the left hand push button (LOCK).
The ST50 Wind Trim and Speed Trim Instruments can only be used when a
Sea Talk compatible Wind/Speed Instrument is connected to the bus.
Information from the respective transducers is then is then put onto the
bus and displayed by the Trim instruments. F urther Trim instruments may
be connected to the bus to provide displays at secondary steering
positions.
5.1 Illumination
[=}~
LOCK
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[ B.D]
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o
Pack Contents 5
1. Introduction 6
2. Control Head 6
2.1 Siting 7
2.2 Mounting procedure 7
Surface Mounting 7
Bracket Mounting 8
Flush Mounting 9
2.3 Power supply 9
2.4 Connection to SeaTalk compatible Instruments / Autopilot .. 10
2.5 Connection to separated Instruments 10
2.6 Ring Connection 11
3. Faultfinding 12
4. Maintenance 13
4.1 Display units 13
4.2 Cabling 13
Advice 13
5. Operation 14
5.1 Illumination 14
5.2 Locking on (ST50 Wind Trim) 15
5.3 Locking on (ST50 Speed Trim) 15
6. Specification 16
• Push the LOCK button within 8 seconds to select the illumination level
L3 High
L2
Medium
L1
Low
LO
Off
Note: Display returns to previous status after 8 seconds.

4
ST50 WindTrim and SpeedTrim Operation and Installation Handbook
ST50 WindTrim and SpeedTrim Operation and Installation Handbook
4. Maintenance
4.1 Display units
13
• In certain conditions, condensation may appear on the window. This will
not harm the instrument, and can be cleared by switching on the
illumination to the brightest level.
• Never use any chemical or abrasive materials to clean your ST50 Trim
instrument. If the instrument becomes dirty wipe clean with a
damp cloth.
4.2 Cabling
• Avoid running cables through bilge's where possible and secure any
coiled lengths at regular intervals.
• Avoid running cables close to fluorescent lights,engines,radio
transmitting equipment etc.
• Check cabling for chafing or damage to outer casing, replace where
necessary and re-secure.
Advice
Should any difficulties arise, please consult Nautech's Product Support
department in the UK. or your own National Distributor who will be able to
provide expert assistance.

12
3. Fault finding
5T5O WindTrim and 5peedTrim Operation and Installation Handbook
5T5O WindTrim and 5peedTrim Operation and Installation Handbook
Pack Contents
5
All Autohelm products are subject to a comprehensive test procedure
prior to packing and shipment. In the unlikely event that a fault does arise
the following check list should help cure the problem.
The following items are included in the ST50 WindT rimjSpeedT rim packs.
1. Power loom 5. Fixing studs
Fault
Digital and analogue
display not working.
No exchange of
information between
SeaTalk instruments.
(i.e. illumination levels)
Failure of a group of
instruments in the
SeaTalk chain.
Cause
No supply.
Action
Check Cabling and security
of Sea Talk connectors.
Return Instrument for
repair.
Check security of SeaT alk
Connectors 0
Remove instruments one by
one to isolate faulty unit.
Check security of Sea Talk
Connectors between
functioning and non
functioning units.
2. Instrument head
3. Protective cover
4. Handbook
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6. Fixing nuts
7. Dealer list
8. Warranty booklet
Autohelm
WINDTRIM
AND SPEEDTRIM
Operation and
Installation
-3
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Autohelm
WORLDWIDE
SERVICE CENTRES
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6
2
Autohelm
WARRANTY
TermsandCondlllons
010401

6
ST50 WindTrim and SpeedTrim Operation and Installation Handbook
ST50 WindTrim and SpeedTrim Operation and Installation Handbook
11
1. Introduction
Congratulations. You are now the owner of an ST50 Trim instrument. The
ST50 Wind trim and ST50 Speed Trim Instruments provide racing crews
with up to the second information on changes in Wind Speed (True or
apparent) and Boat Speed. In addition the WindT rim can also be used as a
steering indicator for wind direction (True or apparent).
Both instruments are repeaters and receive Speed;Wind from the .Sea Talk
bus. Simply lock the instrument onto the current value - shown on the
digital display - and the analogue pointer will indicate changes in that figure
of up to +/-15 %. The locked value can be increased or decreased at any
time using the increment/decrement button.
SeaTalk
extension cable
Cat no. 0131
9m (30ft)
Junction
box
2.6 Ring Connection
® .............-- ®
o
(J/~. ®
\J~J
® ;iif--~--)i·l ®
Installations that have a large number of instruments on the SeaT alk bus
may require a second ring main connection. This should be fed back to the
circuit breaker to avoid excessive voltage drops. This can be checked
using the table below:
SeaTalk Cable
length
Up to 10m (33ft)
Up to 20m (66ft)
Max number of units
(Single connection)
13
7
Max number of units
(Second connection)
26
13
The second connection should be made to the spare lead on the last
instrument and led back to the circuit breaker. If the SeaT alk bus is
receiving power from an autopilot course computer, the second
connection should be made at the spare SeaT alk terminal on the course
computer.

10
2.3 Power supply
5T50 WindTrim and 5peedTrim Operation and Installation Handbook
5T5O WindTrim and 5peedTrim Operation and Installation Handbook
2. Control Head
7
The ST50 Speed ;Wind Trim Instruments receive their power from the
Sea Talk bus. They can only display Speed;Wind information transmitted
on the Sea Talk bus by SeaT alk compatible Speed and Wind Instruments
and cannot be used as standalone instruments.
2.4 Connection to SeaTalk compatible Instruments / Autopilot
All SeaT alk instruments and autopilot control units receive both power and
information from the SeaT alk bus. Each unit has two SeaT alk connectors
(3 pin) on short 150mm (6in) tails to allow adjacent units to simply
plug together.
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(Y)
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E
o
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110mm (4.331n)
---...
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39mm
(l.5in)
24mm
I--I~
Separated instruments are connected using one of the SeaT alk extension
cables available. These are supplied with a SeaTalk connector fitted to
each end. A junction box is also available to rejoin the cable if it is cut to
ease routing or for shortening.
If preferred, any two core screened cable to the following specification
may be used in the place of the SeaT alk cable.
~~II II
000'00-0
To course computer
bus connection
2.5 Connection to separated Instruments
To any further
ST50 instruments
or autopilot
control units
2.1 Siting
The Wind/Speed Trim Instrument is designed for above or below deck
installation.
Position where it is :
•
Easy to read by the helmsman
• Reasonably well protected from physical damage.
• At least 230mm (gin) from a compass.
• At least 500 mm (gin) from radio receiving equipment.
• Accessible from behind to secure in place and run cables.
Note: The back cover is designed to breath through a duct in the cable
boss to prevent moisture accumulation.
Minimum Copper Area A.W.G
Screen
2 Cores
O.5mm
O.5mm
22
22

8
ST50 WindTrim and SpeedTrim Operation and Installation Handbook
ST50 WindTrim and SpeedTrim Operation and Installation Handbook
9
2.2 Mounting procedure
Surface Mounting
The surface must be smooth and flat.
1. Use the template provided to mark the centres of the two fixing holes
and cable boss.
Note: Adjacent units should have 6mm (1/4 in) separation to allow room
for the protective covers.
2. Drill to 4mm (5/32 in) diameter.
3. Use a 50mm (2in) diameter cutter to drill the hole for the centre boss.
4. Screw the two fixing studs (2) into the back cover.
5. 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 of the
instrument.
Bracket Mounting
As an alternative to surface mounting, a kit (Cat no D 130) is available to
bracket mount the instrument.
2
Flush Mounting
A flush mounting kit (Cat No. D 183) for installations where a flush mount is
required or is more desireable . Full installation instructions are provided
with the kit.
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01117-1