Specifications; Troubleshooting - Standard Horizon SL150 Owner's Manual

7 Specifications

Power supply
• 10.7 to 16.6 VDC, 30 mA with backlight on.
Operating temperature
• 32° to 113°F (0° to 45°C)
Size of display
• 4.4 x 4.4 x 1" (112 x 112 x 24mm), overall
depth 1.4" (35mm) behind panel.
Display type.
• Twisted Nematic (TN) grey background,
32° to +158°F (0° to +70°C).
Illumination
• Red LED switchable from key pad.
RF interference
• Less than 6 dB maximum quieting on any
marine radio channel with 3 dB gain antenna
within 1 meter of instrument display head
Boat speed
• 0 to 50 knots (depending on transducer type).
User selectable to display in 0.1 or 0.01
increments.
Speed units and resolution
• 0.0 to 19.9 and then 20 to 50 in knots, MPH or
KPH.

8 Troubleshooting

No display:
• Check DC power connections and DC polarity
with voltmeter. Voltage must be between 10.7
and 16.6 volts.
No speed reading:
1 Under normal operation, the life of a
paddlewheel is 2 years. Replace if worn. See
section 3.2 for replacement part.
2 Remove speed impeller from thru hull, spin
paddlewheel manually and check for reading.
3 Check for fouling on paddle and thru-hull
fitting.
4 Check for break in cable.
Low or high speed reading:
1 Check calibration.
2 Inspect for damage to paddlewheel or fouling
of fitting or paddle.
Erratic speed reading:
1 Is there clear water flow over paddlewheel?
2 Is paddlewheel aligned fore and aft correctly?
3 Is the paddlewheel clean and turning freely?
See section 3.2 for replacement parts.
SL150 User Manual
Average speed
• Unit selectable to 50 knots, resets to zero via
key pad or at power down.
Maximum speed
• Records max. speed to 50 knots. Reset to
zero via key pad or at power down.
Trip log
• 0 to 1999 units key pad resettable.
Total log
• 0 to 1999 units key pad resettable.
Timers
• 1 to 10 minute count down timers with audible
alarms, 0 to 19:59 hours count up elapsed
time.
Sea temperature
• 32.0° to 99.9°F (0.0° to 37.7°C) 10kOhm at
77°F (25°C). Tenths of a degree are displayed.
Sea temperature sensor type
• 10k ohm NTC at 25°C (77°F).
NMEA Outputs
• The SL150 outputs the following NMEA0183
data sentences; DBT, VHW, VLW, MTW,
PTTK.
Erratic readings while the engine is running:
To isolate the problem, remove the impeller. If the
problem goes away, reroute the cable away from
the engine. If problem persists:
1 Add feed through filter capacitor on the
positive terminal of the ignition coil.
2 Add and alternator whine filter to alternator.
3 Replace spark plug with resistive type.
No, or inaccurate temperature reading:
Remove, inspect and clean transducer if needed.
Measure resistance between pins 1 and 4 on
connector. Transducer is defective if shorted or open.
1 Check calibration
2 Check for break in cable
Speed cable is not long enough:
• Use EX345 optional cable. A maximum of two
cables can be connected.
Simulation Mode
• At power up, if all the segments display for 5
seconds then the instrument is in simulation
mode. See section 5.5.
11