4
Maintenance
The sensor can be used for a long period of time without being oiled or greased, but please check the
followings at least once a year.
1. The Sensor Unit
1) When the wind is calm (less than 2 m/s), check if the movement
of propeller and tail is smooth or
not. When there is no wind, manually rotate the propeller and tail by hand and observe until they
stop. If the movement is still not smooth, the moving parts need to be oiled or the ball-bearing
replaced. Please contact us or distributor for repair.
2) To keep accuracy effectively conduct accuracy test every 4 to 5 years. Or in some cases send out for
an over-haul.
2. Indicator
1) A small lightning arrester is built-in to protect against troubles due to lightning, but it may not work
in case of a large surge voltage. Check the movement of the pointers of indicator after lightning.
2) To detect such a failure early, it is useful to remember how to physically measure wind speed by
comparing wind pressure on your body with indicated values and speed of the propeller at usual low
wind speed.
3) This indicator should be inspected every 4 to 5 years as well as the sensor unit.
Trouble shooting
1. Indicator
A. Wind speed section
1. When the propeller is rotating but pointer in the indicator does not move.
1) Apply a tester to the input terminal No. 1 and No. 2 in the indicator. Set the tester range at 10 to
50VAC.
a. If there is no voltage, the problem is poor connection with cable or troubles in the generator.
b. Check for deterioration of rectifier, condenser or resister in the indicator.
c. Caused by lightning, deterioration of surge absorber often occurs.
Remove ERZV10D101. If the pointer begins to move, this part may be deteriorated.
