OMC-131 True wind display
Users’ manual
V1.14
Page 16
TDC-April-2017
3. Commissioning
Before switching ON the mains, check that the power supply is correct as indicated on the
identification label on the rear of the equipment.
With no signal cable connected, switch on the display and observe the front panel LED,s. The
system will perform a led test all led are switched on and off one by one. When the test is finished
the display shows on the led circle no information and on both speed displays only "---" is shown.
This is because no sensor information is received by the display.
3.1 wind sensors relative wind information
Check the voltage at terminals [1] and [2] on the rear panel this should be 15 Volts DC. With all
cabling correctly connected, the display will show the relative wind speed and wind direction directly
as transmitted by the wind sensor. Sensor should be aligned with respect to the bow of the ship.
Adjustment cannot be made as the sensor-signal is digitally transmitted.
When there is no serial information received from the wind sensor the watchdog circuit in the
display unit starts to switch the 15 Volt supply voltage to the sensor ON and OFF. The supply
voltage is 10 seconds ON and if none information is received from the wind sensor the supply
voltage is switched OFF for 5 seconds. If this is happening during the commissioning check the
wiring to the wind sensor.
If two wind sensor are used the same procedure should be followed for the second wind sensor.
Which sensor is used can be seen from the indication leds on the front panel. The switching
between the sensors is done automatically or if selected by hand via the menu key and the arrow
up/down keys. If on automatic, the sensor selected depends on the wind direction. If the wind
direction is between 345 and 195 degrees Portside sensor is used, if the wind is blowing from 015
and 165 degrees Starboard sensor is used.
When the display is fully operational and the wind sensor information is not received for more than
5 seconds the display starts flashing indicating that the sensor information is not longer received by
the display unit.
If from the speed display inside the led circle the decimal point between the hundred and the ten
display is ON the Eeprom has been damaged. Settings for proper operation are most probably lost.
The display must be returned to the factory.
If in doubt about the information shown on the displays, note the following information,
Relative wind speed
Relative wind direction
Ships heading as shown on the OMC-131
Ships speed as shown on the OMC-131
Calculate true wind speed
Calculate true wind direction
Contact Observator Instruments with the above information at hand.
