Specifications

28
AVANTI Service Lift for Wind Turbines
6.3.5 Torques Assurance
Check tightening torques of all screw connections
with approved and calibrated torque wrench in the
following cases:
A. In tower factory, during assembly of ladder section
to tower section.
B. On site, pre-commissioning, and in each yearly
inspection.
See joints to be checked and appropriate tightening
torques for each case in the list below:
Ladder: TORQUE (N•m)
ASSEMBLY IN
TOWER
FACTORY
ASSEMBLY
ON SITE
JOINT METRIC
Ladder sections
12 50 50
Ladder
anchorages –
Tower brackets
12 50 12
Ladder – Top
mechanical stop 8 15 15
Ladder – Bottom
mechanical stop 8 15 15
Traction system –
Double Motor group:
TORQUE (N•m)
ASSEMBLY IN
TOWER
FACTORY
ASSEMBLY
ON SITEJOINT METRIC
Gear box –
Centrifugal brake
8 15 15
Motor group – Main
structure 8 15 15
Motor – Centrifugal
brake 8 15 15
Cabin: TORQUE (N•m)
ASSEMBLY IN
TOWER
FACTORY
ASSEMBLY
ON SITEJOINT METRIC
Fall protection an-
chor point – Cabin
12 50 50
Roller shafts –
Main structure 12 50 50
Counter roller
guide shafts –
Main structure
12 50 50
6.3.6 Overload, static and dynamic tests
A. Overload detection system test: check that the
overload detection system works by applying a load
of 125% of working load limit to the lift floor. The
service lift shall not move UP and the overload light
on the control box shall be on.
B. Static test: apply a load of 125% of working load
limit to the lift floor. The service lift does shall not
show any damage or cracks.
C. Dynamic test: apply a load of 110% of working
load limit to the lift floor. The service lift shall be able
to move UP.
6.3.7 Motor group
6.3.7.1 Gear box
Visually check for oil leaks. In case oil leaks are found,
exchange the gasket on the gear box cover, and re-fill
with oil as needed. Close the cover and ensure that
the correct torque is applied.
6.3.7.2 Centrifugal brake
To check their operation, proceed as follows:
With cold centrifugal brake, perform a manual test in
power descent on approximately 2 meters. The
descent has to be done at maximum speed of 24 m/
min. If the speed is more than 24 m/min, put the lift
out of service and call service for replacement as the
centrifugal brake means are not in good conditions.
Review lining and hubs. The lining of the centrifugal
brake has a friction surface that is worn with use.
When the thickness is reduced to half the original,
linings and hubs should be replaced by new ones.
This operation will be done only by qualified
personnel according to centrifugal brake
manufacturer instructions.
6.3.7.3 Motor brake
After checking the correct operation of centrifugal
brakes, the motor brake operation must also be
checked. To check the operation of the motor brakes,
proceed as follows:
Load the service lift with a load of 1.1 times the
nominal load. Release one of the two motor brakes by
pulling its hand lever. While keeping the brake open,
push the UP button and stop after 0,5 m. The cabin
should stop and the brake must be able to hold the
cabin. Repeat this operation 3 times.
Repeat the operation with the other motor brake.
If any of the two motor brakes fail to stop and hold the
service lift in position, proceed as follows:
Measure the air gap. If the air gap is greater than
specified by the manufacturer and the brake disc
thickness is sufficient, readjust the air gap according
to the motor brake manufacturer’s specifications.
Check whether the brake discs and the springs have
irregularities or damages. If any damages or broken
parts are found, the motor brake must be replaced.
6.4 Ordering spare parts
Only original parts must be used. Spare part list are
available from AVANTI. Please indicate lift model
when requesting a spare part list.
IMPORTANT!
If the overload detection system fails, an expert
must verify the system.