5
2. The reading shown by the indicator is lower than the actual wind speed.
1) One or two bridges of the rectifier in the indicator have failed. (often caused by lightning).
2) A cable is not connected properly.
a. Re-tighten the screws on the terminal block.
b. Measure the line resistance between the transmitting and receiving unit.
3) Deterioration of surge absorber - Perform the procedures,
a) to c)
in 1-1).
4) Drop of output voltage due to deteriorated generator within the sensor unit
Correct Value (no load)
Wind speed
Rotation of
Output
(m/s)
propeller (r.p.m.)
VAC
Hz
2
88
1.3
2.9
5
235
3.4
7.8
10
494
7.2
16.5
B. Wind Direction Section
Cautions
Risk of electrical shock
1. The tail is moving, but pointer of the indicator does not move.
1) Check that the power is
ON. Check the fuse and the power cable.
2) Any two lines among sensor terminal No. 3, 4 or 5 are not properly connected.
Risk of electrical shock
3) The synchro-motor secondly portion is three-phase winding wires. Two wires are broken among them.
2. The pointer suddenly moves with wide scale at certain point.
1) Check the terminal 3, 4 and 5 of the cable between sensor and indicator. One of them is not properly
connected.
2) A winding wire of synchro-motor secondly portion of the sensor unit or indicator is broken. Check
for connections in the sensor unit and the indicator with a tester with the power turned off.
3. When turning on and off the power switch, the pointer turns 180° off.
1) Check terminal No. 6 and 7 on the cable terminals between the sensor unit and the indicator, and
their lines.
Risk of electrical shock
2) Broken first winding wire of synchro-motor of the sensor unit or the indicator. Check for
connections in the transmitting unit and indicator with a tester after disconnecting the cables.
90VAC charges
100VAC charges in the synchro-motor
90 to 100VAC charges in the wind direction circuit.
Be careful when you check the circuit.
