Vaisala WXT520 - Manual (Page 139)

Chapter 10 __________________________________________________________ Troubleshooting
VAISALA______________________________________________________________________ 137
Rain and Wind Sensor Heating
Control
The supervisor message aSU (see Supervisor Message on page 123 )
shows you continuously monitored information about rain and wind
sensor heating (heating temperature Th and heating voltage Vh).
The heating temperature should stay above 0 °C when the heating is on
(except in extremely cold conditions where the heating power is not
sufficient). 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.
Operating Voltage Control
The supervisor message aSU (see Supervisor Message on page 123 )
shows 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.
Technical Support
NOTE In case AC or full-wave rectified AC is used for the heating, the Vh
measurement behaves as follows:
While heating is off, Vh indicates the positive peak value (V
p
) of the
heating voltage waveform.
While heating is on, Vh indicates:
- 0.35 x V
p
in case of AC voltage
- 0.70 x V
p
in case of full-wave rectified AC voltage
For technical questions, contact the Vaisala technical support:
E-mail
[email protected]
Fax +358 9 8949 2790