WSI, WSDI, WSS or WSS-L
User’s Manual
DEIF A/S
Page 12 of 19
5. Troubleshooting
Fault-finding
It is assumed in the following guidance that the fault-finding is carried out on a system that has
been working. However, some of the procedures may also be useful when installing and
commissioning the first time. First, the purpose is to locate the cause of e.g. a missing supply
voltage, a blown fuse, a defective wind sensor, a defective interface box, a defective display or fault
in the cable connection. Further fault-finding and possible repair must be carried out by DEIF A/S.
No light in the instrument
There is no light in the LED circle, nor in the display, the “m/s” or the “KTS” LED.
It is most likely caused by a fault in the internal 5V DC supply that supplies the electronic, meaning
that the fault is possibly due to the fact that one of the two internal fuses has blown. The fuses are
marked F1 and F2. F1 is the fuse for the aux. supply (220V AC or 110V AC) and the type is a 1A
slow blow fuse, and F2 is the fuse for the 5V DC internal supply and the type is a 0.1A slow blow
fuse. See the drawing on page 8.
Check that the correct AC supply voltage (220V AC or 110V AC) is present on the terminals
marked “
≈
”. The correct supply voltage is indicated by means of a cross (x) on the nameplate
located on the rear side of the display.
Then check the 5V DC between terminals “1” (+5V) and “2” (0V) on the display. If the AC supply
voltage is present on the terminals but 5V is missing, a fuse has probably blown. The rear panel
of the display housing is then removed, and the defective fuse is replaced.
Flashing display
If the aux. supply voltage is less than the nominal voltage -20%, the voltage for the built-in
processor is inadequate and the result is a flashing display.
If the speed is indicated as fixed “0” and the display is jumping from 0 degrees to approx. 240
degrees, the 24V DC supply is not able to deliver 1.25A.
Light in the display but inaccurate reading of wind speed and direction
Check the voltage level for wind speed input for the display between terminal “2” (0V) and terminal
“3” on the display to approx. +2.5V DC. During this test the sensor must be exposed to a stable
wind flow (no wind speed = 5V). Then check the voltage level for wind direction input between
terminal “2” and “4” to approx. 1-3V DC. (Be aware that the measurement will fluctuate). If the
voltage levels measured differ from the above, the fault can be related to either the WSS interface
box or the WSS wind sensor itself.
Checking the WSS interface box
First check the voltage connected to terminal “2” (+) and terminal “1” (-) on the interface box. The
voltage level has to be in the range 18-32V. Then check the voltage supply for the wind sensor on
terminal “7” (+) and “9” (-). The voltage level must be 30V DC ±0.5V.
Checking the WSS wind sensor
Check the voltage level on terminals “4” (A) and “5” (B) with respect to terminal “6” (-) on the
interface box. The voltage level measured on terminal “4” must be approx. 2-3V DC, and the
voltage level on terminal “5” must be approx. 2-3V DC. If the voltage differs from the above, the
fault can be related to the cable connection or the wind sensor. Then climb the mast and measure
the voltage level between the red wire (+) and the black wire (-). The voltage has to be 30V DC