bus can supply information to a Multi Function
Display, a Tridata Repeater or any SeaTalk
l Operating Temperature
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.
Power Supply
-
11V to 16V DC at 50ma (illumination off).
-
0°C to
t70°c.
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
-
-10°C to 40°C (14 to 104°F).
l 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
-
Distance in NM or statute miles, user
knots,
user selectable.
selectable.
0 Distance Lost Function
Indicates distance lost during a Tack in
-
either feet or metres.
39mm
1
_
t--------c
1
lhtn
(4.33111)
i---i
(1.5in)
24mm
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.
Note: Tlie back cover is designed to breath
through a duct in the cable boss to prevent
moisture accumulation.
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
0
Screw the two fixing studs 2, into the back
1.
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.
2
Page 5
.3 Power Supply (Fig. 3)
I
0 I ransducer
--
w
11
Power
%&y c&e
2m
(6ft)
Red
Screen
s12v
ov
2.4 Connection to Adjacent
lnstruments (Fig. 4)
Fig. 4To Transduce1
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 vessel’s
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 Transducer
,cz-1,
Ra
lalk TailsSeaTalk 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.
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.
AWG
22
Screen
2 Cores
Minimum Copper Area
0.5mm*22
0.5mm2
Fig. 5
SeaTalkExtensionCable
Cat. No. 0131
(9m
(3011)
supplied)
Scre
_, --.
’ - .
Computer BUS
2.6 Ring Connection
insrarrarrons
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:-
The second connection should be made to the
spare lead on the last instrument and led back
to the circuit breaker.
with a iarge number ot tnstruments
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.
To any f&her
ST50 Instruments
or Autopilot
Control Units
Page 6
3. Transducer Installation
3.1 Connection to instrument
c+.l.
PTCn C..^^A I..^l”
LOL,,JIJ”J))GG” 111311”IIIT;IIt11(13a
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).
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.
5.2 Through Hull Transducers
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 anti-
fouling. Clean the paddle-wheel and exposed
end of Speed/Log transducer plug and apply
single coat of anti-fouling.
5.3 Cabling
I *,,AA r,,nn;n,Tr~L.,nr +l.“^.,nl, Kl”,... ..A.^“^
- n”“l”I”,111111~~“I~JI,II”“~11
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.
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.
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
Speeci is sei up illiileiaciory io
Push and hold down for 2 seconds Speed and
Trip together to select calibration mode.
nulaheln
.-a. .-. :
0
L..’ !
:.... :! : . . . .
TRIP
r-1
SPEED
Cd.
.
--
-.
6.1.1 Measurement Units
I.tr:lii-i-K’II:ii;l
I
l
Push Reset to change display units between
knotsand mph. -
..y :‘..: ; :“‘,
1 l?:
: i”
..:
nt,P
Ll
. .
..--I
-
i.*.i
i.
I
i ‘.; i * !
*
.
0
Push Reset to change display units between
feet and metres.
l
Push and hold down for 2 seconds Speed and
Trip together
store the selected units.
toexit
calibration mode and
6.1.2 Display Contrast Adjustment
l
The LCD viewing angle can be user set to
achieve optimum display legability.
l
Momentarily push Speed and Trip together.
l
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.
,-j7
Decrease
K;ast
6.2 Illumination
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).
The display will return to previous status after
8 seconds.
l
Push Reset to change display units between
nautical miles and statute miles.
TRIP
i
1
0
c
Level
11
Page 9
.
.
6.3 Display Sequence: SPEED
l
Tack
6.5 Display Sequence: TIMER
/
“i”
fIi
i:-:: i.;::
I
l
Boat Speed
. . . . .
,....
.
...* ..:‘.: ,* .
!...*
, j
j...j
:
j...:
: . . . . : : j1 *..
:.-
-4 -I
I.3
c.
.J
l
Velocity Made Good
-
only displayed if wind data available.
l Average Boat Speed*
,____ -. ~~-~~~ _ ~~
i-i
1
1 j”>
j-j
..*.’ L**.j
I-.. ._._ _~~.~_~ ~.
-
Push Reset to reset.
-
Average speed is calculated over a max.
24 hour period after reset and then flashes.
B- 87
a.3
: . . ..:.. ,....
j.::
-...
: *,
!....
.
,
( ““n
IPCCD
l
Trip Distance
..:” :“.* : :“‘,
-
Push Reset for 4 seconds to reset.
TRIP
II
0 Log
.; j.::l
:***;
.j* ::.*: “? *..::*::-J
l
Sea Temperature
“y’ i-l
. .
L ---1
1..
:
*
TRW
J
1
*: : 1
a.
109
-.-..__-
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.
RtSlr
I -1
. :...; :.... ..i”
.i . . . . is,: .:::: i
I i--.------e
:.... ..;. * *...* : : *..., y.
I-. :
: : 1
. . . .1
i.e.: * . . . . * :
!;I
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.
.- --
j...j :‘, : :
:’ : ‘i
. .
i-3’ “:”
p j
.
i
-’
:.,: : . . . .
j...
II
l Timer
..:‘. : :..; :....
i j
: j
I
. : :
17 ,‘) 17
L!!,r,r
-
Push Timer to start/stop.
-
Push Timer to freeze display (indicated by
flashing colon).
l
Race Timer
:-,
I
.-
--
..:-.-. ~~.?..?._‘L- _-.--
-
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.
..:*. : :*.: :...*
jj’ : ’
I I
!
;-,
j...
:....
r,(
_
“f’ :‘:I! p “[
j.**
L..,
,-,
,;,:
. . . .
. . . . .
c..
i...
.,..:i
. . . .
._, ~.
. ..I
]“” *...,
. . . .
j...
. . . .
:..‘.
i
..,a
j
*...*
l
Maximum Speed”
.-
---
:. .: ,-., :* *:
: : j j...j *.*
! :: :: :
-
Push Reset to reset.
*Display returns to current boat speed after
8 seconds.
12
7
-4
L
I
j *<.
..:”
p.. j:
.....
‘-.:
.‘..
,,I.Lt
Note: If timer is already running, use Timer to
return to timer display.
r,l
13
Page 10
2.
Log Calibration
As supplied all ST50 Instrument Modules are
Tested and Calibrated to factory standards. It is
imwwtnnt that
““r.a.
.I...
. . ..-.
hafnrn 1tcino
--.. .D
WV.“._
thicinctrlmxd fnr
. ..- ., ._..-...-. .
.I.
7.1 Manual Calibration Procedure
l
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.
Procedure
l
0
Calculate Correction Factor(F).
I/^^.....
F
= ~“““w”m~!~!ea~~
A:^*....,.-
Measured distance
Known distance
-
From a chart
Measured distance
-
As recorded on speed instrument allowing
for tidal flow as required.
Push and hold down for 2 seconds Speed and
Trip together to select calibration mode.
:a**. .-. :
: ::
*
*....
r-li . . ..
Push Speed to display log calibration factor.
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,
(______
L--...--- _-._---..
:-*. .-a.
; ::i
*...*
i”‘ii . . ..
---. _~._
Cd.
.
..I
WEID
I I
l
Push Speed to select log calibration.
l
At the start of the measured run push Speed
Display shows run number and measured
distance
wrm
I
1
SPIED
I .I
l
Push Speed at the end of the run.
-
Display shows recorded distance for the
run, and after 5 seconds the log
calibration factor.
I-
14
0
Calculate the new log Calibration Factor.
=
Displayed calibration factor x F (min. 0.25,
max 1.50).
0
Adjust the displayed calibration factor using
Reset to increase ( A ) or Timer to decrease (
l
Push and hold down for 2 seconds Speed and
T ).
Trip together to exit calibration and to store
new calibration factor.
0
Push Speed to display distance.
L--.--
0
Adjust displayed distance using Reset to
I
increase ( A ) and Timer to decrease (7 ),
until it equals marked measured distance
(minimum 0.25nm, maximum 2.50nm).
l
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.
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.
15
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