Vaisala WXT530 Series - Operating Voltage Control; Missing Readings and Error Indication

The heating temperature should stay above 0 °C when the heating is on (except in
ex
tremely cold conditions where the heating power is not sucient). The heating voltage
Vh should correspond to the heating voltage supplied. If there is a remarkable deviation,
check the wiring. Note that wire gauge should be large enough to avoid remarkable voltage
drop in the cable.
In case AC or full-wave rectified AC is used for the heating, the Vh measuremen
t behaves
as follows:
While heating is o, Vh indicates the positive peak value (V
p
) of the heating voltage
waveform.
While heating is on, Vh indicates:
• 0.35 × V
p
in case of AC voltage
• 0.70 × V
p
in case of full-wave rectified AC voltage
10.1.3 Operating Voltage Control
The supervisor message aSU show
s you continuously monitored supply voltage level (Vs). In
case of deviations between the supplied voltage and monitored voltage, check the wiring
and the power supply.
10.1.4 Missing Readings and Error Indication
If the transmitter is not able to measure the wind, it indicates a missing reading in the
output. The mos
t common reasons for measurement problems are foreign objects, such as
ice, birds, or other foreign objects, on the line of measurement, or sound reflections from
nearby objec
ts, such as wind tunnel walls.
Chapter 10 – Troubleshooting
155
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