Document No. 1112M001 Revision 1.8 Date: June 2013
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7.0 Maintenance Schedule
The Kestrel e400nb operates with minimum maintenance. The
frequency of visual inspections and integrity checks depends on the
wind class of the installation site. Wind Power Class definition for wind
power density and average wind speed at a hub height of 10m is given
below. In general, higher class wind sites require more frequent
installation checks.
WARNING (Pitch Control)
The pitch control mechanism is a factory assembly and is not user
serviceable. Specialist tools and knowledge is required to carry out
any maintenance or repair procedures. Do not make any unauthorised
adjustments or modifications to any part of this assembly. Do not
force or twist the blades other than gently when checking for wear or
defects.
7.1 Wind Power Class
Identify the Wind Power Class for the site. This number from 1 to 7 is
defined by the site average annual wind speed. Values are for an
anemometer height of 10m (33ft)
Wind Power
Class
Wind Power Density
(W/sq m)
Wind Speed
m/s
1
Up to 100
Up to 4.4 (9.8)
2
100 – 150
4.4 – 5.1(11.5)
3
150 – 200
5.1 – 5.6 (12.5)
4
200 – 250
5.6 – 6.0 (13.4)
5
250 – 300
6.0 – 6.4 (14.3)
6
300 – 400
6.4 – 7.0 (15.7)
7
Above 400
Above 7.0 (21.1)