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12.0 Troubleshooting
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
103
necessary
Parking brake does not
release
1. Control fault
2. Loss of power
3. Wiring faulty
4. Solenoid faulty
1. Clear fault
2. Check grid connection
3. Check leads, connectors
4. Disassemble and check
solenoid
Dynamic brake does
not engage
1. Electrical component
failure
1. Check dynamic brake panel,
connections, capacitors and
contractors and fuses
Generator not turning
(with rotor rotating)
1. Transmission failure 1. Disassemble and overhaul
transmission
Generator not
producing power
1. Electrical connections faulty
2. Insulation problem
1. Inspect and test connections
2. Meg generator
Gearbox noise 1. Loose machine fasteners
2. Low oil level
1. Check and tighten all fasteners
2. Check level, add oil, determine
cause of leak and call AOC
Excessive blade noise 1. Insect or ice build-up
2. Cuts or scratches in blades
3. Loose tip brake parts
1. Wash blades
2. Repair cuts
3. Check tip brakes
Excessive twist in twist
cable
1. Too many machine revs. 1. Disconnect cable, untwist
Turbine does not yaw 1. Yaw lock engaged
2. Yaw bearing needs grease
3. Yaw bearing failure
4. Machine not level (yaw axis not
vertical)
1. Disengage yaw lock
2. Inspect, grease bearing
3. Inspect bearing and attempt
manual yaw
4. Adjust level at tower feet