Leroy-Somer LSA 43.2, Installation And Maintenance Manual

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LEROY-SOMER
2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
4.4 - Mechanical defects
Fault Action
Bearing
Excessive overheating of one or
both bearings (bearing tempera-
ture 80°C above the ambient tem-
perature) (With or without abnor-
mal bearing noise)
- If the bearing has turned blue or if the grease has turned
black, change the bearing.
- Bearing not fully locked (abnormal play in the bearing cage)
- End shields incorrectly aligned
Abnormal
temperature
Excessive overheating of
alternator frame (more than
40° C above the ambient
temperature)
- Air flow (inlet-outlet) partially clogged or hot air is being
recycled from the alternator or engine
- Alternator operating at too high a voltage (>105% of Un on
load)
- Alternator overloaded
Vibrations
Too much vibration
- Misalignment (coupling)
- Defective mounting or play in coupling
- Rotor balancing fault (Engine - Alternator)
Excessive vibration and humming
noise coming from the machine
- Phase imbalance
- Stator short-circuit
Abnormal
noise
Alternator damaged by a
significant impact, followed by
humming and vibration
- System short-circuit
- Misparalleling
Possible consequences
- Broken or damaged coupling
- Broken or bent shaft end
- Shifting and short-circuit of main field
- Fan fractured or coming loose on shaft
- Irreparable damage to rotating diodes/AVR, surge suppressor
4.3 - Bearings
The bearings are permanently
greased
Approximate life of the grease (depending on use)
= 20,000 hours or 3 years.
As an option, the bearings are
regreasable
Regreasing interval: 6000 hrs of operation
DE bearing: Amount of grease: 30 gr
NDE bearing: Amount of grease: 15 gr
Standard grease LITHIUM - standard - NLGI 3
Grease used in the factory ESSO - Unirex N3
It is advisable to lubricate the alternator during operation and on first use. Before
using another grease, check for compatibility with the original one.