8 Maintenance
In order to ensure the long-term safe and optimum operation of the wind energy converter, mainte‐
nance is required at regular intervals.
Frequency
One mechanical maintenance, one visual maintenance, one grease maintenance and one electri‐
cal maintenance are carried out per year. The maintenance activities are spread out over the year
so that every wind energy converter is being serviced once per quarter. The first maintenance is
carried out at 300 operating hours after commissioning.
Visual maintenance
During visual maintenance – as during the other maintenance activities – technicians check the
wind energy converter for damage (for example, damaged cables or rotor blades) and listen for un‐
usual noises during operation (for example, noise from the bearings).
Grease maintenance
During grease maintenance, technicians not only perform visual maintenance but also top up or
replace lubrication components, and apply lubrication to seals.
Mechanical maintenance
In addition to grease maintenance, mechanical maintenance includes checks or tests of the follow‐
ing items:
■ Fasteners (in particular of rotor blades) and weld seams
■ Tightening torques (300-h maintenance)
■ Yaw gears and pitch gears
■ Safety ladders
■ Tower cooling system
■ Load-bearing parts
■ Rotor brake
■ Rotor blades (visual check from nacelle roof)
Electrical maintenance
Electrical maintenance includes checks or tests of the following items:
■ Sensors, detectors, measuring equipment, push buttons, switches, and fuses
■ Shadow shutdown and noise optimisation (depending on equipment)
■ Overspeed switch and emergency pitch system
■ Transmission (depending on equipment)
■ Accuracy of yaw angle and blade angle
■ Start-up procedure and software version
■ Release circuits and safety circuits
■ Cables and connections
■ Lightning protection and earthing
Maintenance
D0376616-2 / DA 19 of 21
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