Vaisala AWS330 - Manual (Page 231)

Chapter 7 ___________________________________________________________ Troubleshooting
VAISALA ______________________________________________________________________ 229
Problem Situations for Ultrasonic Wind Sensor
WMT703
Table 66 Some Problem Situations and Their Remedies
Problem Probable Cause Remedy
Connection to WMT703 is lost. Power supply is not
sufficient. Check the power supply for
proper operation.
Disturbance from the
installation site is causing
measurement problems. Check that the installation site
matches the requirements
listed in section Selecting
Location on page 33. Wind measurement failure. WMT703 is
sending irregular data values.
Snow, ice, a bird, or
some other object is
blocking the
measurement path
between the ultrasonic
transducers. Remove the blockage and
check that the wind
transducers are not damaged.
If the blockage is ice or snow,
it melts after some time if you
are using a heated version of
WMT703. Duration of the
blockage depends on the
severity of the weather event.
If birds are causing the
blockage, consider installing a
bird cage.
Reported wind direction is not correct. WMT703 is misaligned,
which causes an offset
error. Realign WMT703 according to
section Aligning Ultrasonic
Wind Sensor WMT703 on
page 67.
There is a 180-degree offset error in the
reported wind direction. WMT703 is misaligned,
which causes an offset
error. Rotate WMT703 to match the
proper wind direction; see
section Aligning Ultrasonic
Wind Sensor WMT703 on
page 67.
Incorrect <CR><LF>
settings in the terminal
program. Configure the terminal
program to send both carriage
return (<CR>) and line feed
<LF>. WMT703 does not respond to
commands.
The wiring might be
incorrect. Check the wiring; refer to
Appendix A, Wiring Diagrams,
on page 263.
Serial communication is inconsistent or
data is missing. Pin contacts of the
connector have become
oxidized or the connector
is not firmly attached. Change the WMT703 cable.