my!
WIND
Ltd.
Soola 1a
51013 Tartu, Estonia
Email: [email protected]
Website: www.mywind.ee
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P a g e 2 6 / 0 7 / 2 0 1 9
Annex 2
– Tower verticality
Due to the turbine having a passive yaw system and being a downwind machine, a level tower is of
great importance. A out of plumb tower can have a significant influence on the energy production of
the machine. Therefore, it is recommended to check the tower status at times to make sure that you
are getting the best out of your product.
Observe the position of my!Wind on calm days. If the turbine seems to favour a single position with no
wind, the tower my require fine tuning even if it appears to be level using the spirit level technique
presented in
Chapter 5, Step 8
. Be aware, that levelling the tower may require some trial and error
adjustments
– even though the base is level, the upper tower flange may be off level due to
manufacturing tolerances.
When you observe that the turbine has a strong tendency to gravitationally orient in one particular
direction, that is contrary or irrespective to apparent wind direction, a fine tuning is necessary. This
indicates that the tower must be adjusted in a direction to opposite from which the turbine is self-
orienting. In this case the turbine blade cover is pointing at the direction which needs to be lifted.
Use the technique described in
Chapter 5, Step 8
to level the tower even with the turbine on top.
Perform this operation only during days with calm wind. Disregard the reading on the spirit level and
concentrate on the behaviour of the turbine. Its ability to orient easily on the yaw axis in response to
the wind direction is far more important than any other secondary references.
While moving the M27 nuts up or down observe if the turbine has oriented away from its specific or
particular direction and is responding to the subtle changes in wind direction. If this is accomplished,
stop the levelling process, if not, continue to incrementally tip the tower with the nuts. As you will
determine, this is a trial and observation process and the tower can be out of plumb in more than one
axis.
The tower may also slightly lean to on side under the influence of bright sunlight. The sun heats one
side of the tower and it expands, flexing the tower and the tower remains tilted until the sun is no
longer shining on the tower. This follows a very regular patter throughout the day if the sun is shining.
In this case the adjustment is not necessary.
After adjustment, DO NOT forget to fix all of the M27 nuts with appropriate torque.
