Wind Monitor Series
14
Often Campbell Scientific recommends factory replacement of the
bearings and potentiometer. Refer to the
document for the procedure of acquiring a Returned Materials
Authorization (RMA). Mechanically-adept users may choose to
replace the bearings or potentiometer themselves. Instructions for
replacing the bearings and potentiometer are given in R.M.
Young’s manuals (
).
9. Troubleshooting
9.1 Wind Direction
Symptom: NAN, –9999, or no change in direction
1. Check that the sensor is wired to the excitation and single-ended channel
specified by the measurement instruction.
2. Verify that the excitation voltage and range code are correct for the
datalogger type.
3. Disconnect the sensor from the datalogger and use an ohmmeter to check
the potentiometer. Resistance should be about 10 k
Ω
between the blue
and white wires. The resistance between either the blue/green or
white/green wires should vary between about 1 k
Ω
to 11 k
Ω
depending on
vane position. Resistance when the vane is in the 5 degree dead band
should be about 1 M
Ω
.
Symptom: Incorrect wind direction
1. Verify that the excitation voltage, range code, multiplier and offset
parameters are correct for the datalogger type.
2. Check orientation of sensor as described in Section
(p. 9)
9.2 Wind Speed
Symptom: No wind speed
1. Check that the sensor is wired to the pulse channel specified by the pulse
count instruction.
2. Disconnect the sensor from the datalogger and use an ohmmeter to check
the coil. The resistance between the red and black wires should be about
2075
Ω
. Infinite resistance indicates an open coil; low resistance indicates
a shorted coil.
3. Verify that the configuration code, and multiplier and offset parameters
for the pulse count instruction are correct for the datalogger type.
Symptom: Wind speed does not change
1. For the dataloggers programmed with Edlog, the input location for wind
speed is not updated if the datalogger is getting “Program Table
Overruns”. Increase the execution interval (scan rate) to prevent
overruns.
NOTE
Summary of Contents for Wind Monitor Series
Page 2: ......
Page 6: ......
Page 24: ...Wind Monitor Series 16...
Page 26: ...Appendix A Importing Short Cut Code Into CRBasic Editor A 2...
Page 30: ...Appendix B Example Programs B 4...
Page 34: ...Appendix C Wind Direction Sensor Orientation C 4...
Page 36: ...Appendix D Wind Direction Measurement Theory D 2...
Page 37: ......
