Source page: Gearbox Fundamentals for Wind Technicians · Original file: original.pptx · Provenance: ✓ quote verified (native text)
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Vibration velocity RMS on the HSS bearings: alert 3.5 mm/s, alarm 4.5 mm/s
Oil analysis every 6 months: iron alert 50 ppm, PQ index alert 60
The trend matters more than a single value