Wind Vane Service Manual
7
Transducer arm
To reassemble the transducer arm:
1. Fit the transducer arm cable assembly as follows:
i.
Arrange the upper connector of the transducer arm cable assembly as shown in
Figure 4 .
Figure 4:
Cable/connector arrangement
ii. Feed the transducer arm cable assembly upper connector though the bottom of the arm, then up the arm and into
the bottom pod.
iii. Ensuring that the key on the lower connector of the transducer arm cable assembly is aligned with the keyway on
the arm, push the lower connector into the bottom of the arm, until both clips engage, to secure the connector in
the arm.
iv. Connect the upper connector of the transducer arm cable assembly to the appropriate connector on the PCB.
2. With the PCB connector adjacent to the cable entry hole on the top pod, place the PCB in its recess in the bottom pod,
ensuring that the cut-aways in the PCB engage with the respective protrusions on the lower pod.
3. Check the condition of the O-ring seal (item 5) and if it has been damaged, obtain a new one.
4. Fit the O-ring seal into the groove above the thread on the top pod.
5. Screw the top and bottom pods together and secure tightly, to ensure a waterproof seal. If necessary, use a suitable tool
to engage with the holes in the top pod, to facilitate this.
6. Ensuring that the flats on the anemometer cups and the lower pod shaft are aligned, slide the anemometer cups on to
the lower pod shaft then secure with the screw removed during disassembly.
7. Ensuring that the flats on the vane and the upper pod shaft are aligned, slide the vane to the upper pod shaft then
secure with the screw removed during disassembly.
Testing
To check that a wind vane is serviceable:
1. Connect the wind vane to a serviceable ST60 Wind instrument as in
Figure 5 .
Figure 5:
Test connections
2. At the ST60 Wind instrument, check that the voltage between the red and black connections is 8 V dc, ±0.25 V:
3. Rotate the vane to the forward, starboard, aft and port orientations in turn and, at the instrument, check the sine and
cosine signals by measuring the voltages as follows:
D6962-1
D6961-1
Green
Yellow
Screen
Blue
Red
Red
Screen
+12 V
0 V
