WEG G Serie Manual De Instalación, Operación Y Mantenimiento página 50

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THE ALTERNATOR, IN NO LOAD, IS EXCITED THROUGH OVERVOLTAGE.
ANOMALY
Faulty voltage thiristor of regulator.
Power transformer of regulator is defective or
incorrect.
Supply of voltage regulator is not according to the
desired output voltage.
ANOMALY
Stability improperly set
Oscillations in the speed of the drive machine.
ANOMALY
Overheating of bearings.
Overheating in the alternator frame.
Excessive vibration.
Strong voltage drop with subsequent recovery:
(flashes)
ATTENTION
The machines included in this manual are in continuous improvement, so the information in this manual is
subject to changes without notice.
50 l Installation, operation and maintenance manual – Synchronous Alternator – G line - Horizontal
 Replace regulator.

Check voltage / operation ratio.
 Redo the connections. Check the manual of the voltage regulator.
OSCILLATION ON ALTERNATOR VOLTAGE
 Adjust the stability of the regulator with the Stb trimpot.
 Frequent oscillations are originating from the drive machine and need
to be eliminated.
MECHANICAL ANOMALIES

Faulty bearing, lack of lubrication or excessive axial clearance.

Air input or output partially clogged or hot air is returning to the
alternator, alternator overload or over excitement.

Misalignment, faulty assembly or clearance in coupling.

Incorrect adjustment of stability, alternator operating with simple
parallelism system turned on or momentary overload.
PROCEDURE
PROCEDURE
PROCEDURE
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