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6.0 Tower and Wind Turbine Generator Installation
NOTICE: Use of the material contained in this document is subject to the warning on page Iv and the disclaimer
on page v of this document.
DOC012R02 AOC 15/50 User Manual Nov 2001
41
6.4 Blade Installation
This procedure should be carried out by a minimum of three technicians. Each blade weighs 135
kg (300 lbs) and can be lifted by a crew of three or four or using equipment such as a back hoe or
a boom truck fitted with nylon slings or ropes. Metal slings or chains should never be used to
move a blade.
CAUTION
NICKS OR GOUGES IN THE BLADE SURFACE CAN
AFFECT THE PERFORMANCE AND THE EXPECTED LIFE
OF THE BLADE SIGNIFICANTLY. TAKE EVERY
PRECAUTION TO PROTECT THE BLADE SURFACE
DURING HANDLING AND INSTALLATION.
The first two blades should be installed with the machine still set on the ground. The yaw lock
should be engaged, to restrict the turbine from rotating about the yaw axis. See Figure 6-4 for
the yaw locking position. The parking brake is released by pulling on the manual release, after
which the hub can be rotated so that a blade can be mounted with its tip or tip brake supported
above the ground (see Figure 6-1). The blade should rest on a piece of packing foam to prevent
surface damage. A drift pin or bolt placed in a blade bolt hole on the hub will help align the
blade with the hub.
WARNING
BLADE WASHERS SHOULD LIE FLAT AGAINST THE HUB
COUNTERBORE. FAILURE TO INSTALL WASHERS PROPERLY
CAN RESULT IN LOOSENING AND FAILURE OF FASTENERS.
THIS MAY RESULT IN BLADE DETACHING, SEVERELY
DAMAGING THE MACHINE AND CAUSING SERIOUS INJURY
OR DEATH.
The red protective plugs should be removed from the blade inserts in the root end. The blade
should be slid onto the hub, with the concave (upwind) side of the blade towards the machine.
The tip brake wire, which exits the trailing edge of the blade near the root, must not be damaged.
It is helpful to tape this down to the blade during assembly.
Note: The concave ('bottom' of the airfoil) MUST face the machine. Only the blade bolt
washers supplied with the wind turbine should be used. These washers are oval shaped and
designed for the blade mounting. The washer must be oriented in the correct position for the
required pitch, as the washers are not symmetric. It is extremely important that the
washers are seated entirely in the hub slot counter bores and rest flat on the bottom of
these counter bores. If the washers are even slightly misaligned, the bolts and washers
should be reassembled.