Vaisala WAV252 User manual

Quick Reference Guide
WAV252 Heated Wind Vane
Installation and Maintenance
0002-028
www.vaisala.com
INSTALLATION
Initial Check
Prior to the installation check that the WAV252 is not
damaged during transportation. Check also that the shaft
rotates smoothly without any detectable noise. It is
recommended to mount the sensor body when the vane
assembly is removed. Be careful not to cause damage to the
shaft of the sensor body or to the connector pins.
Mechanical
The Heated Wind Vane WAV252 is preferably installed into
the WAC151 sensor cross arm. On bottom of the WAV252
there is a special button-shaped temperature sensor
(diameter 22 mm), elastically attached to the bottom plate.
This is for sensing the ambient temperature and should
therefore be set in good thermal contact with the mounting
support.
NOTE The three mounting screws properly tightened
will force the temperature sensor button firmly
enough against the support.
0002-024
Figure 1. Mounting of the Wind Sensor and the Hub
When installed to the WAC151 cross arm, the WAV252 is
mounted at the northern end, the southern end is reserved
for the WAA252 Heated Anemometer.
1. First pre-assemble the three mounting screws, with
plastic washers, to the anemometer's mounting legs.
2. Fit the 10-pin cable plug through the mounting flange
and connect it to the sensor.
3. Mount the sensor to the flange by twisting, and tighten
the screws.
4. Finally, mount the cup assembly. Align the planes in
the shaft and inside the hub. The bottom edges of the
hub and the shoulder should reach approximately the
same level (see Figure 1). Tighten the set screw.
WAC151 Wiring
The wiring diagram for the WA252 system to the WAC151
Sensor Crossarm is presented in the Figure 2. The power
input wire connections are highlighted, since they differ from
those for regular wind sensors.
0002-025
Figure 2. WAC151 Standard Wiring for WAA252 and WAV252
When using standard power and signal cables ZZ45049 and
ZZ45048 the connections are following:
1. For power supply, connect the YEL, GRN, and PNK
colored wires to the screw terminal #2 and the WHT,
BRN, and GRY colored wires to the terminal #3.
2. For signal output connect wires GRN, YEL, WHT, VIO,
GRY, and PNK to terminals #7 … #12. For signal
grounding, connect BLK to the terminal #5.
3. For the optional sensor power input connect BRN to
the terminal #6.
As a power source use the Vaisala WHP25 Mains Power
Supply, which has a mast mountable, all-weather enclosure.
For a typical installation see the figure on the front page.

Ref. WAV252-U433en-1.1
MAINTENANCE AND REPAIR
Ball bearings must be checked once a year visually and by
rotating the sensor shaft. To do this, remove first the vane
assembly as instructed below (A1). The shaft should spin
smoothly and should not create any detectable noise.
Replacement of the bearings should be done only by a
trained technician. Steps A1 to A15 are for disassembling and
steps B1 to B10 are for reassembling. The numbers in
parenthesis refer to Figure 3.
A1. Loosen the set screw (use allen key) and carefully
remove the vane assembly.
CAUTION Be careful with the connector pins, do
not bend them.
A2. Loosen the hex nut of the green MIL-connector at the
bottom of the sensor body (use 22 mm tool).
A3. Loosen the three capnuts (1) at the bottom of the
sensor body (use 7 mm tool).
A4. Remove the body cover and the O-rings (2).
A5. Release the connector (3) of two white wires from the
power supply board (4).
A6. Loosen the three nuts (5) at the bottom of the power
supply board (4) and remove it (use 7 mm tool).
A7. Loosen the shaft heating foil (6) (use pliers).
A8. Loosen the set screw of the rotating transformer
assembly (7) (use allen key).
A9. Loosen the spacer screws (8) (use 6 mm tool).
A10. Remove the sensor board (9) together with the rotating
transformer assembly (7).
CAUTION Handle the rotating transformer
carefully, do not drop or hit.
A11. Remove the retaining ring (10) (use narrow-pointed
pliers) and the bushing from the shaft tunnel.
A12. Remove the upper bearing (12) after pulling out the
shaft.
CAUTION Handle the shaft carefully, do not drop
or hit.
A13. Remove the retaining ring (13) at the shaft.
A14. Remove the lower bearing (14).
For reassembling the sensor:
B1. Install the bearings in reverse order.
NOTE Be careful when assembling the
bearings.
B2. The rotating transformer assembly (7) is reinstalled
together with the sensor board (9). Its (7) set screw is
not fastened until in step B7, when the power supply
board has been reinstalled and the gap adjusted.
B3. In assembling, push the transformer (7) as far up as
possible towards the shaft tunnel.
B4. Reassemble the spacer screws (8), the power supply
board (4) and tighten the nuts (5).
NOTE Make sure the four pin connector (15)
installs properly.
B5. For adjusting the gap, place a 0.4 mm feeler gauge
between ferrite coils (parts 4 and 7) (preferably use 30
mm wide feeler gauge).
B6. Place a screwdriver tip into the slot between the top
end of rotating transformer assembly (7) and the shaft
tunnel, and pry until the air gap between ferrite coils
is 0.4 mm (0.016”) (use feeler gauge for measuring).
CAUTION The ferrite coils are breakable, do not
try to adjust the gap by prising them.
B7. When the gap is right, fasten the set screw of the
rotating transformer assembly (7).
CAUTION Make sure the rotating transformer
assembly rotates freely without
touching the lower part at any rotary
position of the shaft.
B8. Reconnect the shaft heating foil (6) and the connector
of two white wires (3).
B9. Reassemble the body cover (2) with new O-rings.
B10. Tighten the three capnuts (1) and the connector nut.
B11. Install the vane as instructed in mechanical section.
Spare parts: Order number:
Vane assembly for WAV252 WA35336
Set of bearings and gasket 16644WA
0002-029
Figure 3. WAV252 Assembly