Leroy-Somer LSA 49.1 4P Instruction Manual

This manual is to be given to
the end user
LSA 49.1 4P
ALTERNATORS
Installation and maintenance
3007 en - 2010.06 / j
53
343 107
100
347
78
37
79
349
70
90
1
36
4
28
41
18
51
31
59
91
278
364
269
368
268
279
71
371
177
365
198
172
281
270
21
4
30
33
60
284
68
15
62
22
34
48 49
367
255
254
277 280
281
283
172
282
279
278
320
15
Optional 6-wire terminal box
with connector links
Hub, turbine
LSA 191 L 11

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INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
This manual concerns the alternator which you
have just purchased.
We wish to draw your attention to the contents
of this maintenance manual. By following
certain important points during installation,
use and servicing of your alternator, you can
look forward to many years of trouble-free
operation.
SAFETY MEASURES
Before using your alternator for the rst time, it is important to
read the whole of this installation and maintenance manual.
All necessary operations and interventions on this alternator
must be performed by a qualied technician.
Our technical support service will be pleased to provide any
additional information you may require.
The various operations described in this manual are
accompanied by recommendations or symbols to alert the
user to potential risks of accidents. It is vital that you understand
and take notice of the following warning symbols.
Warning symbol for an operation capable of
damaging or destroying the alternator or
surrounding equipment.
Warning symbol for general danger to personnel.
Warning symbol for electrical danger to personnel.
Note: LEROY-SOMER reserves the right to modify the
characteristics of its products at any time in order to incorporate
the latest technological developments. The information
contained in this document may therefore be changed without
notice.
WARNING SYMBOLS
We would like to draw your attention to the following two safety
measures that must be complied with:
a) During operation, do not allow anyone to stand in front of the
air outlet guards, in case anything is ejected from them.
b) Do not allow children younger than 14 to go near the air
outlet guards.
A set of self-adhesive stickers depicting the various warning
symbols is included with this maintenance manual. They
should be positioned as shown in the drawing below once the
alternator has been fully installed.
WARNING
The alternators must not be put into service until the machines
in which they are to be incorporated have been declared
compliant with Directives 98/37/EC and 2004/108/EC plus any
other directives that may be applicable.
Copyright 2004 : MOTEURS LEROY-SOMER
This document is the property of :
MOTEURS LEROY-SOMER
It may not be reproduced in any form without prior
authorization.
All brands and models have been registered and patents
applied for.
WARNING

3
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
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1 - RECEIPT
1.1 - Standards and safety measures .................... 4
1.2 - Inspection ...................................................... 4
1.3 - Identication .................................................. 4
1.4 - Storage .......................................................... 4
1.5 - Applications ................................................... 4
1.6 - Contraindications to use ................................ 4
2 - TECHNICAL CHARACTERISTICS
2.1 - Electrical characteristics ................................ 5
2.2 - Mechanical characteristics............................. 5
3 - INSTALLATION
3.1 - Assembly ....................................................... 6
3.2 - Inspection prior to rst use ............................. 6
3.3 - Terminal connection diagrams ....................... 7
3.4 - Commissioning .............................................. 9
3.5 - Settings.......................................................... 9
4 - SERVICING - MAINTENANCE
4.1 - Safety measures.......................................... 10
4.2 - Regular maintenance................................... 10
4.3 - Fault detection ............................................. 10
4.4 - Mechanical defects .......................................11
4.5 - Electrical faults..............................................11
4.6 - Dismantling, reassembly.............................. 13
4.7 - Installation and maintenance of the PMG..... 15
4.8 - Table of characteristics ................................ 15
5 - SPARE PARTS
5.1 - First maintenance parts ............................... 16
5.2 - Technical support service............................. 16
5.3 - Accessories ................................................. 16
5.4 - Exploded view, parts list............................... 18
EC DECLARATION OF INCORPORATION

4
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
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1 - RECEIPT
1.1 - Standards and safety measures
Our alternators comply with most international standards.
See the EC Declaration of Incorporation on the last page.
1.2 - Inspection
On receipt of your alternator, check that it has not suffered any
damage in transit. If there are obvious signs of knocks, contact
the transporter (you may able to claim on their insurance) and
after a visual check, turn the alternator by hand to detect any
malfunction.
1.3 - Identication
The alternator is identied by means of a nameplate glued to
the frame.
Make sure that the nameplate on the alternator conforms to
your order.
The alternator name is dened according to various criteria
(see below).
Example of description for : LSA 49.1 M6 C6/4 -
• LSA : name used in the PARTNER range
M : Marine / C : Cogeneration / T : Telecommunications.
• 49.1 : alternator type
• M6 : model
• C : Excitation system (C: AREP / J: SHUNT+ PMG /
E: COMPOUND)
• 6/4 : winding number / number of poles.
1.3.1 - Nameplate
So that you can identify your alternator quickly and accurately,
we suggest you ll in its specications on the nameplate
below.
1.4 - Storage
Prior to commissioning, alternators should be stored :
- Away from humidity : in conditions of relative humidity of more
than 90%, the alternator insulation can drop very rapidly, to just
above zero at around 100%; monitor the state of the anti-rust
protection on unpainted parts.
For storage over an extended period, the alternator can be
placed in a sealed enclosure (heatshrunk plastic for example)
with dehydrating sachets inside, away from signicant and
frequent variations in temperature to avoid the risk of
condensation during storage.
- If the area is affected by vibration, try to reduce the effect of
these vibrations by placing the generator on a damper support
(rubber disc or similar) and turn the rotor a fraction of a turn
once a fortnight to avoid marking the bearing rings.
1.5 - Application
These alternators are mainly designed to produce electricity in
the context of applications involving the use of generators.
1.6 - Contraindications to use
Use of the alternator is restricted to operating conditions
(environment, speed, voltage, power, etc) compatible with the
characteristics indicated on the nameplate.
ALTERNATEURS ALTERNATORS
Valeurs excit / Excit. values
en charge / full load
à vide / at no load
Made in FRANCE - 1 024 959/b
Tension
Voltage
Secours
Std by
40°C
27°C
PUISSANCE / RATING
Conforme à C.E.I 60034-1. According to I.E.C 60034-1.
C US
166631
Connex.
Phase
kVA
kW
A
kVA
kW
A
V
Ph.
Continue
Continuous
LSA Date
N° Hz
Min
-1
/R.P.M. Protection
Cos Ø /P.F. Cl. ther. / Th.class
Régulateur/A.V.R.
Altit. m Masse / Weight
Rlt AV/D.E bearing
Rlt AR/N.D.E bearing
Graisse / Grease

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INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
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2 - TECHNICAL
CHARACTERISTICS
2.1 - Electrical characteristics
PARTNER LSA 49.1 alternator is generator without sliprings or
revolving eld brushes, wound as “2/3 pitch”; 6 or 12-wire, with
class H insulation and a eld excitation system available in
either AREP or “SHUNT+PMG” version (see diagrams and
AVR maintenance manual).
2.1.1 - Options
- Stator temperature detection sensors
- Space heaters
- Terminal box with connector links for mounting protection or
measurement C.T.
Interference suppression conforms to standard EN 55011,
group 1, class B (Europe).
AREP system with R 450
SHUNT + PMG system with R 450
2.2 - Mechanical characteristics
- Steel frame
- Cast iron end shields
- Greasable ball bearings
- Mounting arrangement
IM 1201 (MD 35): Single-bearing with feet and SAE anges/
coupling discs
IM 1001 (B 34): Twin-bearing with SAE ange and standard
cylindrical shaft extension
- Drip-proof alternator, self-cooled
- Degree of protection: IP 23
2.2.1 - Options
- Protection against harsh environments
- Air inlet lter, air outlet labyrinth seals: IP 44
To prevent excessive temperature rise caused by clogged
lters, it is advisable to monitor the stator winding with thermal
sensors (PTC or PT100).
- Bearing temperature detection sensors.
T1 T2 T3
T4 T5 T6
Surge suppressor
5+ 6-
T7 T8 T9
T10 T11 T12
R 450
Aux. windings
STATOR : 12 wires (marked T1 to T 12)
Exciter
Field
Armature
MAIN FIELD
Voltage reference
STATOR : 6 wires (marked T1 to T6)
T1 T2 T3
T4 T5 T6
Surge suppressor
5+ 6-
T7 T8 T9
T10 T11 T12
R 450
PMG
STATOR : 12 wires (marked T1 to T 12)
Exciter
Field
Armature
MAIN FIELD
Voltage reference
STATOR : 6 wires (marked T1 to T 6)

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INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
3 - INSTALLATION
Personnel undertaking the various operations
discussed in this section must wear the appropriate
personal protective equipment for mechanical and
electrical hazards.
3.1 - Assembly
All mechanical handling operations must be
undertaken using approved equipment and the
alternator must be horizontal. Check how much the
alternator weighs (see 4.8.5.) before choosing the
lifting tool. During this operation, do not allow
anyone to stand under the load.
3.1.1 - Handling
The generously-sized lifting rings are for handling the alternator
alone. They must not be used to lift the genset. The choice of
lifting hooks or handles should be determined by the shape of
these rings. Choose a lifting system which respects the integrity
and the environment of the alternator.
3.1.2 - Coupling
3.1.2.1 - Single bearing alternator
Before coupling the two alternators, check that both are
compatible by :
- undertaking a torsional analysis of the transmission on both
units
- checking the dimensions of the ywheel and its housing, the
ange, coupling discs and offset.
When coupling the alternator to the prime mover,
the holes of the coupling discs should be aligned
with the ywheel holes by rotating the engine
ywheel.
Do not use the fan to turn the alternator rotor.
Make sure the alternator is securely bedded in
position during coupling.
3.1.2.2 - Two-bearing alternator
- Semi-exible coupling
Careful alignment of the alternators is recommended, checking
that the concentricity and parallelism of both parts of the
coupling do not exceed 0.1 mm.
This alternator has been balanced with a 1/2 key.
3.1.3 - Location
Ensure that the ambient temperature in the room where the
alternator is placed cannot exceed 40°C for standard power
ratings (for temperatures > 40°C, apply a derating coefcient).
Fresh air, free from damp and dust, must be able to circulate
freely around the air intake grilles on the opposite side from the
coupling. It is essential to prevent not only the recycling of hot
air from the alternator or engine, but also exhaust fumes.
3.2 - Inspection prior to rst use
3.2.1 - Electrical checks
Under no circumstances should an alternator, new
or otherwise, be operated if the insulation is less
than 1 megohm for the stator and 100,000 ohms for
the other windings.
There are three possible methods for restoring these minimum
values.
a) Dry out the alternator for 24 hours in a drying oven at a
temperature of approximately 110°C (without the AVR).
b) Blow hot air into the air intake, having made sure that the
alternator is rotating with the exciter eld disconnected.
c) Run in short-circuit mode (disconnect the AVR) .
- With the alternator stopped, short-circuit the three output
power terminals using connections capable of supporting the
rated current (try not to exceed 6 A/mm2).
- Insert a clamp ammeter to monitor the current passing through
the short-circuit connections.
- Connect a 12 Volt battery to the exciter eld terminals,
respecting the polarity, in series with a rheostat for adjusting
the resistance in order to obtain an excitation current equal to
the rated stator current (eg : 10W/50W),
- Open fully all the alternator openings.
- Run the alternator at its rated speed, and adjust the exciter
eld current using the rheostat to obtain the rated output current
in the short-circuit connections.
Note : Prolonged standstill : In order to avoid these problems,
we recommend the use of space heaters, as well as turning
over the alternator from time to time. Space heaters are only
really effective if they are working continuously while the
alternator is stopped.
Ensure that the alternator has the degree of
protection matching the dened environmental
conditions.
WARNING
WARNING
WARNING
WARNING

7
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
3.2.2 - Mechanical checks
Before starting the alternator for the rst time, check that :
- the winding connection corresponds to the site operating
voltage (see section 3.3),
- all xing bolts and screws are tight,
- cooling air is drawn in freely,
- the protective grilles and housing are correctly in place,
- the standard direction of rotation is clockwise as seen from
the shaft end (phase rotation in order 1 - 2 - 3).
For anti-clockwise rotation, swap 2 and 3 and derate the
machine by 5%.
If mounting a C.T. for parallel operation, reverse the secondary
wires S1, S2 on the AVR.
3.3 - Terminal connection diagrams
A standard alternator is tted with 3 phase coppers and 1
neutral connection terminal. The winding code is specied on
the nameplate.
Any intervention on the alternator terminals during
reconnection or checks should be performed with
the alternator stopped.
3.3.1 - Standard terminal connection : 6-wire
NDE NDE
Optional 6-wire terminal box with connector links for mounting protection and (or) measurement C.Ts.
N
T1
T2
T3
T4
T5
T6 T1
T2
T3
T4
T5
T6
380
0
220
0
Connection code Voltage L.L Factory connection
Star
Delta
T3
T2
T1
T3
T2
T1
L1(U)
L2(V)
L3(W)
N
T4
T5
T6
L1(U)
L2(V)
L3(W)
L1(U)
L2(V)
L3(W)
L1(U)
L2(V)
L3(W)
T4
T5
T6
3-phases
N
T1
T4
T3
T6
T5
T2
L1(U)
L3(W) L2(V)
D
L1(U)
L3(W)
T1
T4
T3
T6
T5 T2 L2(V)
F
Delta
F
single-phase
or
3-phases
60 Hz50 Hz
6S
7S
8S
220 - 240 220 - 240
240 - 254
220 - 240
6S
7S
8S
9
60 Hz50 Hz
380 - 415
380 - 416
415 - 440
500 - 525
380 - 480
600
R 450 voltage detection :
0 => (T3) / 220 V => (T2)
R 450 voltage detection :
0 => (T3) / 380 V => (T2)
Winding 9 : R 450 voltage detection + transformer (See specific diagram AREP or PMG)
Winding
Winding
AR
AR
Star
D

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INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
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3.3.2 - Terminal connection : 12-wire version
R 450 voltage detection :
0 => (T3) / 220 V => (T2)
R 450 voltage detection :
0 => (T3) / 220 V => (T2)
R 450 voltage detection :
0 => (T3) / 220 V => (T1)
R 450 voltage detection :
0 => (T3) / 380 V => (T2)
OPTION
L1(U)
N
L3(W)
T1 T7
T12
T10
T4
T9
T3
T6
T11
T5
T2
T8 L2(V)
A
3-phases
3-phases
3-phases
60 Hz50 Hz
190 - 208
190 - 208
208 - 220
190 - 240
6
7
8
6
7
8
6
7
8
9
N
T1
T7
T12
T10
T4
T9
T3 T6
T11 T5
T2
T8
L1(U)
L3(W) L2(V)
D
L1(U)
L2(V)
L3(W)
N
T9
T8
T7
T3
T2
T1
T4
T6
T10
T11
T12
T5
T3
T2
T1
T3
T2
T1
60 Hz50 Hz
380 - 415
380 - 416
415 - 440
500 - 525
380 - 480
600
L1(U)
L2(V)
L3(W)
N
T9
T8
T7
T4
T6
T10
T11
T12
T5
60 Hz50 Hz
220 - 240
220 - 240
240 - 254
220 - 240
L1(U)
L2(V)
L3(W)
T9
T8
T7
T4
T6
T10
T11
T12
T5
F
L1(U)
L3(W)
T1
T7
T12
T10
T4
T9
T3
T6
T11 T5 T2
T8
L2(V)
LL
L1(U)
M
L3(W)
T1
T7
T12
T10
T4
T9
T3
T6
T11 T5 T2
T8
L2(V)
LL
NDE
T3
T2
T1
L1(U)
L2(V)
L3(W)
M
T9
T8
T7
T4
T6
T10
T11
T12
T5
Winding 9 : R 450 voltage detection + transformer (See specific diagram AREP or PMG)
Delta / Edison
Caution : M point connection
is a factory modification.
Winding
Winding
Winding
NDE
NDE
NDE
Connection code Voltage L.L Factory connection

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INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
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3.3.3 - Option connection diagram
3.3.4 - Connection checks
Electrical installations must comply with the current
legislation in force in the country of use.
Check that :
- The residual circuit-breaker conforms to legislation on
protection of personnel, in force in the country of use, and has
been correctly installed on the alternator power output as close
as possible to the alternator. (In this case, disconnect the wire
of the interference suppression module linking the neutral).
- Any protective devices in place have not been tripped.
- If there is an external AVR, the connections between the
alternator and the cubicle are made in accordance with the
connection diagram.
- There is no short-circuit between phase or phase-neutral
between the alternator output terminals and the generator set
control cabinet (part of the circuit not protected by
circuit-breakers or cubicle relays).
- The alternator should be connected with the busbar separating
the terminals as shown in the terminal connection diagram.
- The equipotential earth links have been implemented correctly
(cross-section and continuity of the earths).
3.4 - Commissioning
The alternator can only be started up and used if the
installation is in accordance with the regulations
and instructions dened in this manual.
The alternator is tested and set at the factory. When rst used
with no load, make sure that the drive speed is correct and
stable (see the nameplate). On application of the load, the
alternator should achieve its rated speed and voltage; however,
in the event of abnormal operation, the alternator setting can
be altered (follow the adjustment procedure in section 3.5). If
the alternator still operates incorrectly, the cause of the
malfunction must be located (see section 4.4).
3.5 - Settings
The various adjustments during tests must be made
by a qualied engineer. The screwdriver for making
adjustments must be suitable for use with electrical
equipment. It is essential that the drive speed
specied on the genset nameplate is reached before
commencing adjustment. The AVR is used to make
any adjustments to the alternator. Access to the
AVR adjustments is via the panel provided for this
purpose.
After operational testing, replace all access panels
or covers.
R 791 T interference suppression kit
(standard for CE marking) Connection of the optional current transformer
External voltage potentiometer
or ext. source 1V (resistance 1.5 KΩ)
Black
Black
Black
Blue
White
Connections
T1 T1 T1 T1
T2 T2 T2 T2
T3 T3 T3 T3
N N
Adjusting the voltage
via a remote
potentiometer
ST4
A C D F
Neutral link
In/2 (D conn.)
Secondary 1 A
12-wire 6-wire
A / D connection
P1
P2 T10
Neutral link
In/4 (D conn.)
Secondary 1 A
D connection
P1
P2 T4

10
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
4 - SERVICING - MAINTENANCE
4.1 - Safety measures
Servicing or troubleshooting must be carried out
strictly in accordance with instructions so as to
avoid the risk of accidents and to maintain the
alternator in its original state.
All such operations performed on the alternator
should be undertaken by personnel trained in the
commissioning, servicing and maintenance of
electrical and mechanical components, who must
wear the appropriate personal protective equipment
for mechanical and electrical hazards.
Before carrying out any work on the alternator, ensure that it
cannot be started by a manual or automatic system by isolating
the power in any cabinet or enclosure and make sure you have
understood the operating principles of the system.
4.2 - Regular maintenance
4.2.1 - Checks after start-up
After approximately 20 hours of operation, check that all xing
screws on the alternator are still tight, plus the general state of
the alternator and the various electrical connections in the
installation.
4.2.2 - Cooling circuit
It is advisable to check that circulation of air is not reduced by
partial blocking of the air intake and outlet guards: mud, bre,
soot, etc, and to check whether the ventilation guards are
corroded or scratched.
4.2.3 - Bearings
The bearings are greasable. It is advisable to lubricate the
alternator during operation and when it is rst commissioned.
The lubrication characteristics are given in the table below.
NDE / DE bearing 6322 or 6226 C3 6320 C3
Quantity of grease 60 gr or cm350 gr or cm3
Lubrication interval 4500 hrs of operation
Lubrication intervals are given for grease type
LITHIUM - standard - NLGI 3
The factory lubrication is performed with grease :
ESSO UNIREX N3
Before using another grease, check for compatibility with the
original one. Monitor the temperature rise in the bearings,
which should not exceed 60°C above the ambient temperature.
Should this value be exceeded, the alternator must be stopped
and checks carried out.
4.2.4 - Electrical servicing
Cleaning product for the windings
Do not use : trichlorethylene, perchlorethylene,
trichloroethane or any alkaline products.
Certain strictly dened pure volatile degreasing agents can be
used, such as :
- Normal petrol (without additives); inammable
- Toluene (slightly toxic); inammable
- Benzene (or benzine, toxic); inammable
- Ciclohexare (non toxic); inammable
to clean the stator, rotor, exciter and diode bridge.
The insulating components and the impregnation system are
not at risk of damage from solvents (see the above list of
authorised products).
Avoid letting the cleaning product run into the slots. Apply the
product with a brush, sponging frequently to avoid accumulation
in the housing. Dry the winding with a dry cloth. Let any traces
evaporate before reassembling the alternator.
These operations must be performed at a cleaning
station,equipped with avacuum systemthat collects
and ushes out the products used.
4.2.5 - Mechanical servicing
Cleaning the alternator using water or a high-
pressure washer is strictly prohibited.
Any problems arising from such treatment are not
covered by our warranty.
The alternator should be cleaned with a degreasing agent,
applied using a brush. Check that the degreasing agent will not
affect the paint.
Compressed air should used to remove any dust.
If lters have been added to the alternator after manufacture
and do not have thermal protection, the service personnel
should replace the air lters periodically and systematically, as
often as necessary (every day in very dusty atmospheres).
After cleaning the alternator, it is essential to check the winding
insulation (see sections 3.2 and 4.8).
4.3 - Fault detection
If, when commissioned, the alternator does not work normally,
the source of the malfunction must be identied. To do this,
check that :
- the protective devices are tted correctly,
- the connections comply with diagrams in the manuals supplied
with the alternator,
- the speed of the unit is correct (see nameplate).
Repeat the operations dened in section 3.
WARNING
WARNING
WARNING
WARNING

11
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
4.4 - Mechanical defects
Fault Possible causes
Bearing
Excessive overheating of one or both
bearings (temperature > 80°C on the
bearing retainers with or without abnormal
noise)
- End shields incorrectly aligned (anges not properly tted).
- If the bearing has turned blue or if the grease has turned black, change the
bearing.
Abnormal
temperature
Excessive overheating of alternator
housing (more than 40 °C above the
ambient temperature)
- Air ow (intake-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
Vibration
Excessive vibration
- Misalignment (coupling)
- Defective mounting or play in coupling
- Rotor balancing fault
Excessive vibration and humming noise
coming from the alternator
- Alternator operating in single-phase mode (single-phase load or faulty
contactor or installation fault)
- Stator short-circuit
Abnormal noise Alternator damaged by a signicant impact,
followed by humming and vibration
- System short-circuit
- Mis-paralleling
Possible consequences
- Broken or damaged coupling
- Broken or bent shaft end.
- Shifting and short-circuit of main eld winding
- Fan fractured or coming loose on shaft
- Irreparable damage to rotating diodes or AVR.
4.5 - Electrical faults
Fault Action Effect Check/Cause
No voltage at no
load on start-up
Connect a new battery of
4 to 12 volts to terminals
E- and E+, respecting the
polarity, for 2 to 3 seconds
The alternator builds up and its voltage is
still correct when the battery is removed. - Lack of residual magnetism
The alternator builds up but its voltage
does not reach the rated value when
the battery is removed.
- Check the connection of the voltage reference to the
AVR
- Faulty diodes
- Armature short-circuit
The alternator builds up but its voltage
disappears when the battery is
removed
- Faulty AVR
- Field windings disconnected
- Main eld winding open circuit - check the resistance
Voltage too low Check the drive speed
Correct speed
Check the AVR connections (AVR may be faulty)
- Field windings short-circuited
- Rotating diodes burnt out
- Main eld winding short-circuited - Check the
resistance
Speed too low
Increase the drive speed
(Do not touch the AVR voltage pot. (P2) before running
at the correct speed.)
Voltage too high Adjust AVR voltage
potentiometer Adjustment ineffective - Faulty AVR - 1 faulty diode
Voltage
oscillations
Adjust AVR stability
potentiometer
If no effect : try normal / fast recovery
modes (ST2)
- Check the speed : possibility of cyclic irregularity
- Loose connections
- Faulty AVR
- Speed too low when on load (or LAM set too high)
Voltage correct
at no load and
too low when on
load (*)
Run at no load and check
the voltage between E+ and
E- on the AVR
Voltage between E+ and E-
AREP / PMG < 10V - Check the speed (or LAM set too high)
Voltage between E+ and E-
AREP / PMG > 15V
- Faulty rotating diodes
- Short-circuit in the main eld. Check the resistance
- Faulty exciter armature.
(*) Caution : For single-phase operation, check that the sensing wires coming from the AVR are correctly connected to the operating terminals
Voltage
disappears
during operation
(**)
Check the AVR, the surge
suppressor, the rotating
diodes, and replace any
defective components
The voltage does not return to the rated
value.
- Exciter winding open circuit
- Faulty exciter armature
- Faulty AVR
- Main eld open circuit or short-circuited
(**) Caution : Internal protection may be activated (overload, open circuit, short-circuit)

12
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
4.5.1 - Checking the winding
You can check the winding insulation by performing a high
voltage test. In this case, you must disconnect all AVR wires.
Damage caused to the AVR in such conditions is not
covered by our warranty.
4.5.2 - Checking the diode bridge
DIODE BRIDGE
C
A
Anode Cathode
-
C
A
+
-CA
+
A diode in good
working order must
allow the current
to flow from the anode
to the cathode.
- -
C C C
A A A
~ ~ ~
C C C
A A A
~ ~ ~
+ +
~ ~ ~
C C C
A A A
C C C
A A A
~ ~ ~
4.5.3 - Checking the windings and rotating
diodes using separate excitation
During this procedure, make sure that the alternator
is disconnected from any external load and inspect
the terminal box to check that the connections are
fully tightened.
1) Stop the unit, disconnect and isolate the AVR wires.
2) There are two ways of creating an assembly with separate
excitation.
Assembly A : Connect a 12 V battery in series with a rheostat
of approximately 50 ohms - 300 W and a diode on both exciter
eld wires (5+) and (6-).
WARNING : Adapt the diode to the rated excitation
current of the alternator (see nameplate).
Assembly B : Connect a “Variac” variable power supply and a
diode bridge on both exciter eld wires (5+) and (6-).
Both these systems should have characteristics which are
compatible with the alternator eld excitation power (see the
nameplate).
3) Run the unit at its rated speed.
4) Gradually increase the exciter eld current by adjusting the
rheostat or the variac and measure the output voltages on
L1 - L2 - L3, checking the excitation voltage and current at
no load (see the alternator nameplate or ask for the factory test
report).
When the output voltage is at its rated value and balanced
within <1% for the rated excitation level, the alternator is in
good working order. The fault therefore comes from the AVR
or its associated wiring (ie. sensing, auxiliary windings).
WARNING
6 - 5 +
1A diode
12V battery
Rh. 50 -300W
-+
ASSEMBLY A
Field
1A diode
-
+
6 - 5 +
Variac
AC
220V
DC
12V
50
60
70
80
90
100
40
30
20
10
0
ASSEMBLY B
Field

13
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
4.6 - Dismantling, reassembly (see sections
5.4.1 & 5.4.2)
During the warranty period, this operation must only
be carried out in an approved workshop or in our
factory, otherwise the warranty may be invalidated.
Whilst being handled, the alternator must remain
horizontal (rotor not locked when moved). Check
how much the alternator weighs (see 4.8.5.) before
choosing the lifting method.
The choice of lifting hooks or handles should be
determined by the shape of the lifting rings.
4.6.1 - Tools required
To fully dismantle the alternator, we recommend using the
tools listed below :
- 1 ratchet spanner + extension
- 1 torque wrench
- 1 set of at spanners : 8 mm, 10 mm, 18 mm
- 1 socket set : 8, 10, 13, 16, 18, 21, 24, 30 mm
- 1 puller (U35) / (U32/350)
4.6.2 - Screw tightening torque
IDENTIFICATION screw Ø N.m
Exciter screw M6 8,3
Diode / Star bridge M 6 10
Diode nut M 6 3
Flange / Frame screw M 14 110
Flange / Frame screw (LSA 49.1 L11) M 12 69
NDE shield / frame screw M 14 110
Discs / hub screw M 20 340
Earth screw M 12 35
Grille screws M 6 4
Cover screws M 6 5
Stator connection nut M 12 35
4.6.3 - Access to diodes
- Open the air intake grille (51).
- Disconnect the diodes.
- Disconnect the diodes using an ohmmeter or a battery lamp
(see section 4.5.2).
- Remove the surge suppressor (347).
- Remove the 6 “H” mounting nuts for the diode bridges on the
support.
- Change the tted caps, respecting the polarity.
4.6.4 - Access to connections and the
regulation system
Access directly by removing the box lid (48) or the AVR access
door (466).
4.6.5 - Replacing the NDE bearing on
alternators connected to a diesel engine
- Remove the lid of the protective cover (48) and the AVR
inspection door (466).
- Disconnect the AVR.
- Take off the panels (367 and 368) and the grilles (254 and
255).
- Disconnect the stator connections (T1 to T12).
- Remove the neutral link (278).
- Take out the connector link assembly (281 + 279).
- Take out the connection plate assembly (281 + 270).
- Remove the rear cross-member (269) and the rear panel
(365).
- Remove the air intake grille (51).
- Remove the 4 bearing thrust screws (78).
- Remove all 4 screws (37).
- Take out the bearing (36).
- Remove the ball bearing (70) using a puller with a central
screw (see g. below).
- Check the state of the “O” ring (349) and, if necessary, change
it.
- Fit the new bearing, after heating it by induction at
approximately 80°C.
REPLACE THE DISMANTLED BEARING WITH A
NEW ONE.
4.6.6 - Replacing the DE bearing
- Take out the screws (31) and (62).
- Take out the bearing (30).
- Take out the circlips (284).
- Remove the ball bearing (60) using a puller with a central
screw.
- Fit the new bearing, after heating it by induction at
approximately 80°C.
REPLACE THE DISMANTLED BEARING WITH A
NEW ONE.
WARNING
WARNING

14
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
4.6.7 - Complete dismantling
- Take out the DE bearing (30) as described in section 4.6.6.
- Support the DE rotor (4) with a strap or with a support
constructed following the drawing below.
- Remove the NDE bearing ball bearing cover.
- Knock lightly on the shaft end on the opposite side from the
coupling using a small mallet.
- Move the strap as the rotor moves in order to distribute the
weight over it.
- Remove the NDE bearing following the instructions in section
4.6.5.
4.6.8 - Reassembling the bearings
- Place the “O” ring seal (349) and the preloading wavy washer
(79) in the bearing seat (36).
- Position on the stator (1), bearings (30) and (36).
- Tighten screws (31) and (37).
- Tilt the inner bearing retainer (78) upwards in order to lubricate
the bearing.
- Tighten the 4 HM10 screws on the inner bearing retainer (78).
- Fit the air intake grille (51).
- Replace the rear cross-member (269) and the rear panel (365).
- Replace the connection plate assembly (281 + 270).
- Replace the connector link assembly (281 + 279).
- Replace the neutral link (278).
- Connect the stator connections (T1 to T12) and the sensing wires.
- Ret the panels (367) and 368) and the grilles 254 and 255).
- Reconnect the AVR.
- Ret thelid of the protective cover (48) and the inspection
door of the AVR (466).
4.6.9 - Reassembling the rotor
On single bearing alternators :
- Slide the rotor into the stator and position it as shown in g 24.
- Tilt the inner bearing retainer (78) upwards in order to lubricate
the bearing.
- Tighten the 4 HM10 screws on the inner bearing retainer (78).
- Fit the ange and check that the alternator assembly is
correctly mounted and that all screws are tightened.
On two-bearing alternators :
- Slide the rotor into the stator and position it as shown in the
gure above.
- Tilt the inner bearing retainer (78) upwards in order to lubricate
the bearing.
- Tilt the inner bearing retainer (68) upwards in order to lubricate
the bearing.
- Tighten the 4 HM10 screws on the inner bearing retainer (68
and 78).
- Fit the circlips (284).
- Check that the alternator assembly is correctly mounted and
that all screws are tightened.
NOTE : If the rotor has been fully rewound, it must
be rebalanced.
After operational testing, replace all access panels
or covers.
4.6.10 - Dismantling and reassembly of the lters
- Remove the grille (417) then take out the lter (418) as shown
below. Change the lter, if necessary, please refer to section
4.2.5 for cleaning the lter. To replace follow instructions in
reverse order.
Rotor
NDE shield
Dowel
Nut
Threaded rod
4
78
36
418
417
51

15
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
4.7 - Installation and maintenance of
the PMG
For the LSA 49.1, the PMG reference is : PMG 3.
See the PMG manual ref : 4211.
4.8 - Table of characteristics
Table of average values.
Alternator - 4 poles - 50 Hz - Standard winding No. 6.
(400V for the excitation values).
The voltage and current values are given for no-load operation
and operation at rated load with separate eld excitation. All
values are given at ± 10% and may be changed without prior
notication (for exact values, consult the test report).
4.8.1 - Resistances of main windings at 20°C (W)
Average values for 6S winding - (6 wires)
LSA 49.1 Stator L/N Rotor Field Armature
S4 0.0037 0.33 12 0.08
M6 0.0029 0.38 12 0.08
M75 0.0029 0.38 12 0.08
L9 0.0021 0.43 12 0.08
L10 0.0021 0.43 12 0.08
L11 0.0021 0.5 12 0.08
Average values for 6 winding - (12 wires)
LSA 49.1 STATOR L/N ROTOR Field Armature
S3 0.0051 0.33 12 0.08
M5 0.0044 0.38 12 0,08
M7 0.0036 0.38 12 0.08
L9 0.0023 0.43 12 0.08
4.8.2 - Resistance of AREP auxiliary windings
at 20°C (W)
LSA 49.1 Auxil wdg : X1, X2 Auxil wdg : Z1, Z2
S4 0.23 0.34
M6 0.2 0.27
M75 0.2 0.27
L9 0.18 0.29
L10 0.18 0.29
L11 0.18 0.29
4.8.3 - Field excitation current i exc (A)
50Hz - 60 Hz
LSA 49.1 No load At rated load
S4 0.9 3.6
M6 0.9 3.2
M75 0.9 3.5
L9 0.9 3.3
L10 0.9 3.4
L11 0.8 3.2
4.8.4 - Voltage of auxiliary windings at no load
LSA 49.1 X1, X2 Z1, Z2
50 Hz 90...100 V 10 V
60 Hz 108...120 V 12 V
4.8.5 - Table of weights
LSA 49.1 Total weight (kg) Rotor (kg)
S4 1420 540
M6 1620 620
M75 1620 620
L9 1820 700
L10 1820 700
L11 1970 750

16
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
5 - SPARE PARTS
5.1 - First maintenance parts
Emergency repair kits are available as an option.
They contain the following items :
Description Code
Voltage regulator R 450 (AVR) AEM 110 RE 031
Diode bridge assembly ADE 491 EQ 012
ADE 491 EQ 013
Surge suppressor : 250V PEL 250 EC 002
AVR slow-blow fuse PEL 010 FA 004
Other spare parts
DE bearing 6322/C3 RLT 110 OU 030
NDE bearing
6320/C3 RLT 100 OU 030
Other spare parts LSA 49.1 L11
DE bearing (L11) 6226/C3 RLT 130 OU 020
NDE bearing
6320/C3 RLT 100 OU 030
5.2 - Technical support service
Our technical support service will be pleased to provide any
additional information you may require.
When ordering spare parts, you should indicate the
complete alternator type, its serial number and the
information given on the nameplate.
Address your enquiry to your usual contact.
Part numbers should be identied from the exploded views
and their description from the parts list.
Our extensive network of service centres can dispatch the
necessary parts without delay.
To ensure correct operation and the safety of our alternators,
we recommend the use of original manufacturer spare parts.
In the event of failure to comply with this advice, the manufacturer
cannot be held responsible for any damage.
5.3 - Accessories
5.3.1 - Space heater when stopped
The space heater must run as soon as the alternator stops. It
is installed at the rear of the alternator. Its standard power is
250W with 220V or 250W with 110V on request.
Caution : the power supply is present when the alternator has
stopped.
5.3.2 - Temperature probes with thermistors
(PTC)
These are thermistor triplets with a positive temperature
coefcient installed in the stator winding (1 per phase). There
can be a maximum of 2 triplets in the winding (at 2 levels :
warning and trip) and 1 or 2 thermistors in the bearings.
These sensors must be linked to adapted sensing relays
(supplied optionally).
Cold resistance of cold thermistor sensors :
100 to 250 W per probe.

17
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
5.4 - Exploded view, parts list
5.4.1 - Single-bearing
Ref. Qty Description Ref. Qty Description Ref. Qty Description
1 1 Stator assembly 79 1Preloading (wavy) washer 291 1Shaft adapter
41Rotor assembly 90 1Exciter eld 292 1Magnetic rotor
15 1 Turbine 91 4 Fixing screws 293 1 Stator
18 1Balancing disc 100 1 Exciter armature 294 2Fixing screws
21 1 Lifting ring 107 1 Crescent support 295 1 Tie rod
22 1 Key 172 - Isolator 296 1Cable gland washer + nut
28 1Earth terminal 177 2 AVR support stirrup 297 1End plate
30 1 Drive end shield 198 1 AVR 320 1 Coupling sleeve
31 6 Fixing screws 254 1Right air intake guard 321 1 Sleeve key
33 1 Protective guard 255 1 Left air intake guard 322 3 Coupling disc
34 2Fixing screws 268 1DE cross-member 323 8 Fixing screws
36 1 Exciter end shield 269 1NDE cross-member 325 - Spacer shim
37 4 Fixing screws 270 3 Connection plate 343 1Diode bridge assembly
41 1Front panel 277 3 / 4 Copper bar support 347 1Surge suppressor (+ PCB)
48 1Top panel 278 1Neutral link 349 1 O ring seal
49 -Cover screws 279 6 / 8 Connection bar 364 1AVR support
51 1 Air intake guard 280 3 / 4 Plastic bar support 365 1 Cover rear panel
53 1 Plug 281 2Cover crosspiece 367 1 Left side panel
59 1Cover inspection door 282 2Cover spacer 368 1Right side panel
70 1 NDE bearing 283 4 / 6 Plastic or copper support 371 4 Damper
71 1 Outer bearing retainer 284 1Circlip 417 1Air lter guard
78 1Inner bearing retainer 290 1PMG housing 418 1Filter element
53
343 107
100
347
78
37
79
349
70
90
1
36
323
322
325 320
15
321
34 4
28
41
48 49
18
51
30
31
33
59
91
278
364
269
368
268
367
279
255
254
71
371
177
Optional 6-wire terminal box
with connector links
365
198
172
281
270
21
277 280
281
283
172
282
279
278
320
15
Hub, turbine
LSA 191 L 11

18
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
5.4.2 - Two-bearing
Ref. Qty Description Ref. Qty Description Ref. Qty Description
1 1 Stator assembly 71 1 Outer bearing retainer 290 1PMG housing
41Rotor assembly 78 1Inner bearing retainer 291 1Shaft adapter
15 1 Turbine 79 1Preloading (wavy) washer 292 1Magnetic rotor
18 1Balancing disc 90 1Exciter eld 293 1Stator
21 1 Lifting ring 91 4 Fixing screws 294 2Fixing screws
22 1 Key 100 1 Exciter armature 295 1Tie rod
28 1Earth terminal 107 1 Crescent support 296 1Cable gland washer + nut
30 1 Drive end shield 172 - Isolator 297 1End plate
31 6 Fixing screws 177 2 AVR support stirrup 320 1 Coupling sleeve
33 1 Protective guard 198 1AVR 321 1 Sleeve key
34 2Fixing screws 254 1Right air intake guard 322 3 Coupling disc
36 1 Exciter end shield 255 1 Left air intake guard 323 8Fixing screws
37 4Fixing screws 268 1DE cross-member 325 - Spacer shim
41 1Front panel 269 1NDE cross-member 343 1Diode bridge assembly
48 1Top panel 270 3 Connection plate 347 1Surge suppressor (+ PCB)
49 -Cover screws 277 3 / 4 Copper bar support 349 1O ring seal
51 1 Air intake guard 278 1Neutral link 364 1AVR support
53 1 Plug 279 6 / 8 Connection bar 365 1 Cover rear panel
59 1Cover inspection door 280 3 / 4 Plastic bar support 367 1 Left side panel
60 1 DE bearing 281 2Cover crosspiece 368 1Right side panel
62 4Fixing screws 282 2Cover spacer 371 4Damper
68 4 Inner bearing retainer 283 4 / 6 Plastic or copper support 417 1Air lter guard
70 1 NDE bearing 284 1Circlip 418 1Filter element
53
343 107
100
347
78
37
79
349
70
90
1
36
4
28
41
18
51
31
59
91
278
364
269
368
268
279
71
371
177
365
198
172
281
270
21
4
30
33
60
284
68
15
62
22
34
48 49
367
255
254
277 280
281
283
172
282
279
278
320
15
Optional 6-wire terminal box
with connector links
Hub, turbine
LSA 191 L 11

19
INSTALLATION AND MAINTENANCE
LSA 49.1 4P
ALTERNATORS
3007 en - 2010.06 / j
LEROY-SOMER
Electric Power Generation
DECLARATION of COMPLIANCE
related to CE marking
This Declaration applies to the generators designed to be incorporated into machines complying with the
Machine Directive Nr 2006/42/CE dated 17 May 2006.
MOTEURS LEROY-SOMER
Boulevard Marcellin Leroy
16015 ANGOULEME (France)
Declares hereby that the electric generators of the ranges " PARTNER", Industrial and Professional, as well as
their derivatives, manufactured by Leroy Somer or on Leroy Somer's behalf, comply with the following
International Standards and Directives :
- EN et CEI 60034 -1 et 60034 -5
- ISO 8528 – 3 “ Reciprocating internal combustion engine driven alternating current generating sets.
Part 3. Alternating current generators for generating sets ”
- The Low Voltage Directive Nr 2006/95/CE dated 12 December 2006.
Furthermore, these generators, designed in compliance with the Machine Directive Nr 2006/42, are therefore
able to be incorporated into Electrical Gen-Sets complying with the following International Standards and
Directives :
- The Machine Directive Nr 2006/42/CE dated 17 May 2006
- The EMC Directive Nr 2004/108/CE dated 15 December 2004, as intrinsic levels of emissions and
immunity are concerned
WARNING :
The here above mentioned generators should not be commissioned until the corresponding Gen-Sets have
been declared in compliance with the Directives Nr 2006/42/CE et 2004/108/CE, as well as with the other
relevant Directives.
Technical Managers
P Betge – O Cadel
4152 en – 12.2009 / c

MOTEURS LEROY-SOMER 16015 ANGOULÊME CEDEX - FRANCE
338 567 258 RCS ANGOULÊME
www.leroy-somer.com