Leroy-Somer LSA 43.2 Instruction Manual

2013.01 / k
343
349
347
70
79
90
36
51
48 59
1
124
41
47
198
100
107
91
37
4
16 15
15
30
33
322
324
325
325
320
323
320
49
28
207
120
217
This manual is to be given
to the end user
3434 en -
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
Installation and maintenance

2
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
This manual concerns the alternator which you have just purchased.
We wish to draw your attention to the contents of this maintenance manual.
SAFETY MEASURES
Before using your machine for the rst time,
it is important to read the whole of this
installation and maintenance manual.
All necessary operations and interventions
on this machine 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 recommenda-
tions or symbols to alert the user to the po-
tential risk of accidents. It is vital that you
understand and take notice of the different
warning symbols used.
Warning symbol for an operation capable
of damaging or destroying the machine
or surrounding equipment.
Warning symbol for general danger to
personnel.
Warning symbol for electrical danger to
personnel.
WARNING SYMBOLS
We wish to draw your attention to the
following 2 safety measures which 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 machine 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 EC
and plus any other directives that may be
applicable.
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 informa-
tion contained in this document may there-
fore be changed without notice.
Copyright 2005 :
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
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
CONTENTS
1 - RECEIPT............................................................................................................. 4
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 .................................................................... 5
2.1 - Electrical characteristics ........................................................................................... 5
2.2 - Mechanical characteristics ....................................................................................... 5
3 - INSTALLATION .................................................................................................. 6
3.1 - Assembly .................................................................................................................. 6
3.2 - Checks prior to rst use............................................................................................ 7
3.3 - Terminal connection diagrams.................................................................................. 7
3.4 - Commissioning ....................................................................................................... 10
3.5 - Setting up ............................................................................................................... 10
4 - SERVICING - MAINTENANCE......................................................................... 11
4.1 - Safety measures......................................................................................................11
4.2 - Routine maintenance...............................................................................................11
4.3 - Bearings ................................................................................................................. 12
4.4 - Mechanical defects................................................................................................. 12
4.5 - Electrical faults ....................................................................................................... 12
4.6 - Dismantling, reassembly ........................................................................................ 14
4.7 - Installation & maintenance of the PMG .................................................................. 16
4.8 - Table of characteristics ........................................................................................... 16
5 - SPARE PARTS ................................................................................................. 18
5.1 - First maintenance parts .......................................................................................... 18
5.2 - Technical support service ....................................................................................... 18
5.3 - Exploded views, parts list and tightening torque .................................................... 19
EC declaration of incorporation.......................................................................... 22

4
LEROY-SOMER 2013.01 / k
ALTERNATORS
R
CUS
IEC 60034-1 & 5 NEMA MG1-32 & 33 www.leroy-somer.com 1.025.002 a
Made in ............................ISO 8528-3
166631
IPLSA
N°:
Th.class.
A.V.R. Excit.
Excit. values full load : V / A
at no load : A
D.E. bearing
N.D.E. bearing
Altitude : m
kVA
kW
A
V
kVA
kW
A
Weight : kg
r.p.m.
P.F. :
Hz
RATINGS
Voltage
Phase
Conn.
Contin.
P.R.
B.R.
40°C.
Std by
27°C.
Date :
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
Nameplate
So that you can identify your machine quickly and accurately, we suggest you write its
specications on the nameplate below.
The machine name is dened according to various criteria, for example :
LSA 43.2 M45 J6/4
• LSA : name used in the PARTNER range
M : Marine - C : Cogeneration - T : Telecommunications
• 43.2 : machine type
• M45 : model
• J : excitation system (C : AREP / J : SHUNT or PMG)
• 6/4 : winding number / number of poles.
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 be able to claim
on their insurance) and after a visual
check, turn the machine by hand to detect
any malfunction.
1.3 - Identication
The alternator is identied by means of a
nameplate xed on the machine (see
drawing).
Make sure that the nameplate on the
machine conforms to your order.
1.4 - Storage
Prior to commissioning, machines should
be stored :
- away from humidity (< 90%); after a long
period of storage, check the machine
insulation. To prevent the bearings from
becoming marked, do not store in an
environment with signicant vibration.
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 machine is restricted to operating
conditions (environment, speed, voltage,
power, etc) compatible with the characteri-
stics indicated on the nameplate.

5
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
2 - TECHNICAL CHARACTERISTICS
2.1 - Electrical characteristics
The LSA 43.2/44.2 alternator is a machine
without sliprings or revolving armature
brushes, wound as “2/3 pitch”, 12-wire,
with class H insulation and a eld excitation
system available in either SHUNT, AREP
or «PMG» version (see diagrams and AVR
manuals).
• Electrical options
- Stator temperature detection sensors
- Space heater
Interference suppression conforms to
standard EN 55011, group 1, class B
(Europe).
2.2 - Mechanical characteristics
- Steel frame
- Cast iron end shields
- Protected ball bearings, greased for life
- Mounting arrangements:
IM 1201 (MD 35) foot and ange mounted,
single-bearing with SAE coupling disc.
IM 1001 (B 34) double-bearing with SAE
ange and standard cylindrical shaft
extension.
- Drip-proof machine, self-cooled
- Degree of protection: IP 23
• Mechanical options
- Air inlet lter
- Regreasable ball bearings (only for
LSA 44.2 and SHUNT or AREP version)
- IP 44 protection
T1 T2 T3
T4 T5 T6
Varistor
5+ 6-
T7 T8 T9
T10 T11 T12
R 250
SHUNT SYSTEM
AREP SYSTEM
PMG SYSTEM
STATOR : 12-wire (marking T1 to T 12)
EXCITER
Field
Armature
EXCITER
Field
Armature
EXCITER
Field
Armature
MAIN FIELD
Power supply / Detection
T1 T2 T3
T4 T5 T6
Varistor
5+ 6-
T7 T8 T9
T10 T11 T12
R 438
Aux. windings
STATOR : 12-wire (marking T1 to T 12)
MAIN FIELD
Voltage reference
T1 T2 T3
T4 T5 T6
Varistor
5+ 6-
T7 T8 T9
T10 T11 T12
R 438
PMG
STATOR : 12-wire (marking T1 to T12)
MAIN FIELD
Voltage reference

6
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
3 - INSTALLATION
Personnel undertaking the various
operations indicated in this section must
wear personal protective equipment
appropriate for mechanical and electrical
hazards.
3.1 - Assembly
All mechanical handling operations
must be undertaken using suitable
equipment and the machine must be
horizontal. Check how much the machine
weighs (see 4.7) before choosing the
lifting tool.
During this operation, do not allow
anyone to stand under the load.
• Handling
The generously-sized lifting rings are for
handling the alternator alone. They must not
be used to lift the genset. The choice of
liftinghooksorhandlesshouldbedetermined
by the shape of these rings. Choose a lifting
system which respects the integrity and the
environment of the machine.
During this operation, do not allow
anyone to stand under the load.
• Coupling
Single-bearing alternator
Before coupling the machines, check that
they are compatible by:
- undertaking a torsional analysis of the
transmission,
- checking the dimensions of the ywheel
and its housing, the ange, coupling discs
and offset.
WARNING
When coupling the alternator to the
prime mover, do not use the fan to turn
the alternator or rotor.
The holes of the coupling discs should
be aligned with the ywheel holes by
cranking the engine.
Make sure the machine is securely
bedded in position during coupling.
Check that there is lateral play on the
crankshaft.
Double-bearing alternator
- Semi-exible coupling
Careful alignment of the machines is
recommended, checking that the lack of
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.
• Location
The room where the alternator is placed
must be ventilated to ensure that the
ambient temperature cannot exceed the
data on the nameplate.
3.2 - Checks prior to rst use
• 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.

7
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
L1(U)
N
L3(W)
T1 T7
T12
T10
T4
T9
T3
T6
T11
T5
T2
T8 L2(V)
A60 Hz50 Hz
190 - 208 190 - 240
220 - 230 -
- 190 - 208
6
7
8
N
T1
T7
T12
T10
T4
T9
T3 T6
T11 T5
T2
T8
L1(U)
L3(W) L2(V)
D
N
L1(U)
L2(V)
L3(W)
T9
T8
T7
T12
T10
T11
T4
T3
T2
T1
T5 T6
60 Hz50 Hz
380 - 415 380 - 480
440 - 460 -
- 380 - 416
6
7
8
N
L1(U)
L2(V)
L3(W)
T9
T8
T7
T12
T10
T11
T4
T3
T2
T1
T5
T6
Connection codes L.L. voltage
R 250 voltage sensing:
0 => (T8) / 110 V => (T11)
R 438 voltage sensing:
0 => (T3) / 110 V => (T2)
R 250 voltage sensing:
0 => (T8) / 110 V => (T11)
R 438 voltage sensing:
0 => (T3) / 380 V => (T2)
Winding
Winding
3 phases
3 phases
Factory connection
NDE
NDE
There are 2 possible methods for restoring
the above minimum values.
a) Dry out the machine for 24 hours in a
drying oven at a temperature of 110 °C
(without the regulator).
b) Blow hot air into the air intake, having
made sure that the machine is rotating with
the exciter eld disconnected.
Note : Prolonged standstill
In order to avoid these problems, we
recommend the use of space heaters, as
well as turning over the machine from time
to time. Space heaters are only really
effective if they are working continuously
while the machine is stopped.
Ensure that the alternator has the
degree of protection matching the
dened environmental conditions.
• Mechanical checks
Before starting the machine for the rst time,
check that:
- all xing bolts and screws are tight,
WARNING
- the cooling air is drawn in freely,
- the protective grilles and housing are cor-
rectly in place,
- the standard direction of rotation is clock-
wise as seen from the shaft end (phase
rotation in order 1 - 2 - 3).
For anti-clockwise rotation, swap 2 and 3.
- the winding connection corresponds to the
site operating voltage (see section 3.3).
3.3 - Terminal connection diagrams
To modify the connection, change the
position of the stator cables on the terminals.
The winding code is specied on the
nameplate.
Any intervention on the alternator
terminals during reconnection or checks
should be performed with the machine
stopped.

8
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
FL1(U)
M
L3(W)
T1
T7
T12
T10
T4
T9
T3
T6
T11 T5 T2
T8
L2(V)
L1(U)
L2(V)
L3(W)
FF 60 Hz50 Hz
220 - 240 220 - 240
220 - 240
200
250 - 260 -
6
7
8
M
L
L
L
L
T9
T8
T7
T12
T10
T11 T4
T3
T2
T1
T5
T6
60 Hz50 Hz
220 - 240 220 - 240
220 - 240
200
250 - 260 -
6
7
8
T9
T8
T7 T12
T10
T11
T4
T3
T2
T1
T5
T6
L
LL
T1 T7
T12
T10
T4
T9
T3
T6
T11
T5
T2 T8
L
M
M
T1
T7
T12
T10
T4
T9
T3
T6
T11
T5
T2
T8
L
L
G60 Hz50 Hz
220 - 240 220 - 240
250 - 260
200
-
220 - 240
6
7
8
M
L
L
T9
T8
T7
T12
T10
T11
T4
T3
T2
T1
T5
T6
L1(U)
L2(V)
L3(W)
L
L
60 Hz50 Hz
110 - 120 120
110 - 120
-
120 - 130 -
6
7
8
T9
T8
T7
T12
T10
T11
T4
T3
T2
T1
T5
T6
LL
L3(W)
T1
T7
T10
T9 T3
T6
T11
T5 T2
T8
L2(V)
B
T12
T4
L1(V)
Connection codes L.L. voltage Factory connection
LM voltage = 1/2 LL voltage
LM voltage = 1/2 LL voltage
R 250 voltage sensing:
0 => (T1) / 110 V => (T4)
R 438 voltage sensing:
0 => (T10) / 220 V => (T1)
R 250 voltage sensing:
0 => (T8) / 110 V => (T11)
R 438 voltage sensing:
0 => (T3) / 220 V => (T2)
1 phase
1 phase
or
3 phases
Winding
Winding
NDE
NDE
FOR LSA 44.2, THE COUPLING BIS NOT POSSIBLE
LM voltage = 1/2 LL voltage
Connection not
recommended
R 250 voltage sensing:
0 => (T8) / 110 V => (T11)
R 438 voltage sensing:
0 => (T3) / 110 V => (T2)
R 250 voltage sensing:
0 => (T8) / 110 V => (T11)
R 438 voltage sensing:
0 => (T3) / 220 V => (T2)
Winding
Winding
1 phase
1 phase
or
3 phases
NDE
NDE

9
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
T1 T4
T3
T2
L L
M
L - L
220
230
240
110
115
120
T2 - T3 T2 - T3T1 T4
L - M L L M
T1
T4
T3
T2
LL
L - L
-
-
-
110
115
120
T1 - T3
T2 - T4 -T1-T3 T2 - T4
L - M L L M
SERIAL CONNECTION PARALLEL CONNECTION (Not possible with LSA 44.2)
SINGLE-PHASE 4-WIRE - type M or M1 DEDICATED WINDING
R 251 voltage sensing: 0 => (T1) / 110 V => (T2) R 251 voltage sensing: 0 => (T1) / 110 V => (T2)
Voltage 50/60Hz
Link Link
Output Voltage 50/60Hz Output
• Exciter eld connection
6-
5+
6–
++
– –
R 250 R 438
6-
5+
6–
++
– –
Single-phase dedicated SHUNT version: R 251 AVR (2-wire output without terminal block)
Series connection (shunt excitation)
White
Blue
Black
RedRed
White
Blue
Black
Parallel connection (AREP or PMG excitation)
• Option connection diagram
A D F B F/F G
T1 T1 T1 T1 T1 T2
T2 T2 T2 T2 T9 T4
T3 T3 T3 T3 T3 T3
N N
ST4
LSA 43.2, 44.2
Ph1
Ph2
Ph3
101
102
103
104
130°C
Blue wire
150°C
Black wire
180°C
Red/white wire
R 791 T interference suppression kit (standard for CE marking) Voltage potentiometer
Voltage adjustment
by remote potentiometer
Noir
Noir
Noir
Bleu
Blanc
Anti condensation heater Thermistor (PTC) temperature

10
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
• 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 protection devices in place have not
been tripped.
- If there is an external AVR, the connections
between the alternator and the cabinet are
made in accordance with the connection
diagram.
- There is no short-circuit phase-phase or
phase-neutral between the alternator output
terminals and the generator set control
cabinet (part of the circuit not protected by
circuitbreakers or relays in the cabinet).
- The machine should be connected with the
busbar separating the terminals as shown in
the terminal connection diagram.
- The alternator earth terminal inside the
terminal box is connected to the electrical
earth circuit
- The earth terminal (ref 28) is connected to
the frame.
The connections inside the terminal box
must never be subjected to stress due to
cables connected by the user.
3.4 - Commissioning
The machine can only be started up and
used if the installation is in accordance
with the regulations and instructions
dened in this manual.
The machine is tested and set up at the
factory. When rst used with no load, make
sure that the drive speed is correct and
stable (see the nameplate). With the
regreasable bearing option, we recommend
greasing the bearings at the time of
commissioning (see section 4.2).
On application of the load, the machine
should achieve its rated speed and voltage;
however, in the event of abnormal operation,
the machine setting can be altered (follow
the adjustment procedure in section 3.5). If
the machine still operates incorrectly, the
cause of the malfunction must be located
(see section 4.4).
3.5 - Setting up
The various adjustments during tests
must be made by a qualied engineer.
Ensure that the drive speed specied on
the nameplate is reached before
commencing adjustment.
After operational testing, replace all
access panels or covers.
TheAVR is used to make anyadjustments
to the machine.

11
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
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 machine 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 personal protective equipment
appropriate for mechanical and electrical
hazards.
Before any intervention on the machine,
ensure that it cannot be started by a manual
or automatic system and that you have
understood the operating principles of the
system.
Warning : During and after running, the
alternator will reach temperatures hot
enough to cause injury, such as burns.
4.2 - Routine maintenance
• Checks after start-up
After approximately 20 hours of operation,
check that all xing screws on the machine
are still tight, plus the general state of the
machine and the various electrical
connections in the installation.
• Electrical servicing
Commercially-available volatile degreasing
agents can be used.
Do not use: trichlorethylene, perchlo-
rethylene, trichloroethane or any alkaline
products.
These operations must be performed at a
cleaning station, equipped with a
vacuum system that collects and ushes
out the products used.
The insulating components and the
impregnation system are not at risk of
damage from solvents. 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 machine.
• Mechanical servicing
Cleaning the machine using water or a
highpressure washer is strictly prohi-
bited. Any problems arising from such
treatment are not covered by our
warranty.
Degreasing: Use a brush and detergent
(suitable for paintwork).
Dusting: Use an air gun.
If the machine is tted with air inlet and outlet
lters, the maintenance personnel should
clean them routinely at regular intervals. In
the case of dry dust, the lter can be cleaned
using compressed air and/or replaced if it is
clogged.
After cleaning the alternator, it is essential to
check the winding insulation (see sections
3.2 and 4.8).
WARNING
WARNING

12
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 ow (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
signicant 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 eld
- 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 rst use. Before
using another grease, check for compatibility with the original one.

13
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
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 open circuit (check winding)
- Revolving eld coil 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
- Revolving eld coil 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 AdjustAVR voltage potentiometer Adjustment ineffective Faulty AVR
Voltage
oscillations
Adjust the
AVR stability
potentiometer
If no effect: try normal or fast
stability
modes (ST2)
- Check the speed: possibility of cyclic
irregularity
- Loose connections
- Faulty AVR
- Speed too low when on load (or AVR 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-
(DC)
SHUNT < 20V - AREP / PMG
< 10V
- Check the speed (or AVR LAM set too high)
Voltage between E+ and E-
SHUNT > 30V - AREP / PMG
> 15V
- Faulty rotating diodes
- Short-circuit in the revolving eld coil. Check
the resistance.
- Faulty exciter armature. Check the resistance.
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
- Revolving eld coil open circuit or short-
circuited

14
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
• Checking the winding
You can check the winding insulation by
performing a high voltage test. In this case,
you must disconnect all AVR wires.
WARNING
Damage caused to the AVR in such
conditions is not covered by our
warranty.
• 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-).
6 - 5 +
1A diode
12V battery
Rh. 50 -300W
-
+
A
SSEMBLY A
Field
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 eld excitation power of the machine
(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 machine
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 machine is in good
working order. The fault therefore comes
from the AVR or its associated wiring (ie.
sensing, auxiliary windings).
1A diode
-
+
6 - 5 +
Variac AC
220V
DC
12V
50
60
70
80
90
100
40
30
20
10
0
ASSEMBLY BField
4.5.2 - Checking the diode bridge
A diode in good working order should allow
the current to ow only in the anode-to-
cathode direction.
C
A
Anode Cathode
- -
+ +
~ ~ ~
C C C
A A A
C C C
A A A
~ ~ ~
-
C
A
+
-
C
A
+

15
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
4.6 - Dismantling, reassembly
During the warranty period, this
operation should only be carried out in
an LEROY-SOMER approved workshop
or in our factory, otherwise the warranty
may be invalidated.
Whilst being handled, the machine
should remain horizontal (rotor not
locked in position). Check how much the
machine weighs before choosing the
lifting method.
• Tools required
To fully dismantle the machine, we
recommend using the tools listed below:
- 1 ratchet spanner + extension
- 1 torque wrench
- 1 set of at spanners: 7, 8, 10, 12 mm
- 1 socket set: 8, 10, 13, 16, 18, 21, 22, 24 mm
- 1 size: 5 Allen key (eg. Facom: ET5), 6 Allen
key (ET6), 10 Allen key (ET10), 14 Allen key
(ET14)
- 1 T20 and T30 TORX bit
- 1 puller (U35) / (U32/350).
• Screw tightening torque
See section 5.4.
• Access to diodes
- Remove the air intake grille [51]
- Remove the surge suppressor [347]
- Disconnect the 6 diodes using an ohm-
meter or a battery lamp (see section 4.5.2)
- Replace the bridges, respecting the
polarity (see section 4.5.1)
- Replace the surge suppressor [347]
- Ret the air intake grille [51]
- Replace the terminal box lid [48]
• Access to connections and the
regulation system
The terminals are accessed directly by
removing the terminal box lid [48].
To access the AVR adjustment
potentiometers, the side plate [367] should
be removed.
• Replacing the NDE bearing
- Dismantling
- Remove the terminal box lid [48]
- Remove the air intake grille [51]
- Unscrew the xing clamps on the power
output cables, remove the connector from
the exciter and the R 791 module.
- Remove the 4 nuts on the tie rods
- Remove the NDE shield [36] using a puller:
eg. U.32 - 350 (FACOM)
- Remove the ball bearing [70] using a screw
puller.
- Reassembly
- Heat the inner slipring of a new bearing by
induction or in a drying oven at 80 °C (do not
use an oil-bath) and t it to the machine.
- Place the preloading wavy washer [79] in
the shield and t a new O ring seal [349].
Ret the NDE shield and pass the bundle of
wires between the top bars of the shield.
- Ret the xing clamps on the cables, the
R 791 module and the exciter connector.
- Ret the air intake grille [51].
- Replace the terminal box lid [48].
WARNING

16
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
Rotor
NDE shield
Screw rod
When dismantling the shields, you will
need to change the antifriction bearings,
the “O” ring seal, the preloading (wavy)
washer and adhesive paste.
• Replacing the DE bearing
- Dismantling
- Uncouple the alternator from the prime
mover.
- Remove the 8 assembly screws.
- Remove the DE shield [30].
- Remove the NDE shield (see section
4.6.5.1)
- Remove both ball bearings [60] and [70]
using a puller with a central screw.
- Reassembly
- Heat the new bearings by induction or in a
drying oven at 80°C (do not use an oil-bath)
and t them to the machine.
- Check that both the preloading wavy
washer [79] and the new O ring seal [349]
have been tted on the NDE shield [36].
Ret the NDE shield and pass the bundle of
wires between the top bars of the shield.
- Ret the DE shield [30] and tighten the 4
xing screws.
- Check that the machine assembly is
correctly mounted and that all screws are
tightened.
• Accessing the main eld and stator
- Dismantling
Follow the procedure for dismantling the
bearings (see sections 4.6.5.1 and 4.6.6.1)
- Remove the coupling disc (single-bearing
alternator) or the DE shield (two-bearing
alternator) and insert a tube of the
corresponding diameter on the shaft end.
- Rest the rotor on one of its poles, then slide
it out. Use the tube as a lever arm to assist
dismantling.
- After extraction of the rotor, be careful not
to damage the fan. If the fan is dismantled, it
is essential that it is replaced for the 43.2.
NOTE: If intervention is required on the
main eld (rewinding, replacement of
components), the rotor assembly must
be rebalanced.
- Reassembling the main eld
- Follow the dismantling procedure in
reverse order.
Take care not to knock the windings when
retting the rotor in the stator.
- If the fan is being replaced on the 43.2,
assemble the parts as shown in the following
diagram. Fit a tube and a threaded screw.
On the 44.2 the fan is xed by screws on the
hub.
Follow the procedure for reassembling the
bearings (see sections 4.6.5.2 and 4.6.6.2).
WARNING

17
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
4.7 - Installation and maintenance of
the PMG
For the LSA 43.2 and LSA 44.2, the PMG
reference is PMG 1.
See the PMG maintenance manual, ref:
4211.
Mounting is impossible with the
«regreasable bearings» option with the
LSA 44.2.
4.8 - Table of characteristics
Table of average values:
Alternator - 2 and 4 poles - 50 Hz/60 Hz -
Winding n° 6 and M or M1 connected in
dedicated single-phase. (400 V 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% (for exact values, consult
the test report) and are subject to change
without prior warning. For 60 Hz machines,
the resistance values are the same and the
excitation current «i exc» is approximately 5
to 10% weaker.
• 3-phase LSA 43.2 4 P, SHUNT
excitation
Resistances at 20 °C (Ω)
LSA 43.2 Stator L/N Rotor Field Armature
S1 0.155 1.35 18.4 0.23
S15 0.155 1.35 18.4 0.23
S25 0.155 1.35 18.4 0.23
S35 0.128 1.41 18.4 0.23
M45 0.105 1.57 18.4 0.23
L65 0.083 1.76 18.4 0.23
L8 0.063 1.96 18.4 0.23
Field excitation current i exc (A) - 400 V - 50 Hz
«i exc»: excitation current of the exciter eld
LSA 43.2 no load at load
S1 0.5 1.3
S15 0.5 1.5
S25 0.5 1.6
S35 0.5 1.8
M45 0.4 1.6
L65 0.4 1.6
L8 0.4 1.6
• 3-phase LSA 43.2 4 P, AREP excitation
Resistances at 20 °C (Ω)
LSA
43.2
Stator
L/N Rotor Wind.
X1,X2
Wind.
Z1,Z2 Field Armat.
S1 0,155 1,35 0,32 0,52 4,6 0,23
S15 0,155 1,35 0,32 0,52 4,6 0,23
S25 0,155 1,35 0,32 0,52 4,6 0,23
S35 0,128 1,41 0,29 0,5 4,6 0,23
M45 0,105 1,57 0,26 0,51 4,6 0,23
L65 0,083 1,76 0,26 0,44 4,6 0,23
L8 0,063 1,96 0,21 0,4 4,6 0,23
Field excitation current i exc (A) - 400 V - 50 Hz
«i exc»: excitation current of the exciter eld
LSA 43.2 no load at load
S1 12,6
S15 1 3
S25 13,2
S35 13,6
M45 0,8 3,2
L65 0,8 3,2
L8 0,8 3,2
• Dedicated single-phase LSA 43.2:
4-pole, SHUNT excitation (60 Hz only)
Resistances at 20 °C (Ω)
LSA 43.2 Stator L/N Rotor Field Armature
S1 0,058 1,35 13,9 0,23
S25 0,058 1,35 13,9 0,23
S35 0,046 1,41 13,9 0,23
M45 0,037 1,57 13,9 0,23
L65 0,027 1,76 13,9 0,23
L8 0,019 1,96 13,9 0,23
Field excitation current i exc (A) - 240 V - 60 Hz
«i exc»: excitation current of the exciter eld
LSA 43.2 no load at load
S1 0,59 1,44
S25 0,59 1,68
S35 0,66 1,65
M45 0,61 1,48
L65 0,62 1,48
L8 0,74 1,46
WARNING

18
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
• 3-phase LSA 44.2: 4-pole, SHUNT
excitation
Resistances at 20 °C (Ω)
LSA 44.2 Stator L/N Rotor Field Armature
VS3 0.046 2.51 18.4 0.5
VS45 0.046 2.51 18.4 0.5
S7 0.036 2.91 18.4 0.5
S75 0.036 2.91 18.4 0.5
M95 0.024 3.32 18.4 0.5
L12 0.019 3.66 18.4 0.5
Field excitation current i exc (A) - 400 V - 50 Hz
«i exc»: excitation current of the exciter eld
LSA 44.2 no load at load
VS3 0.5 1.8
VS45 0.5 2.1
S7 0.5 1.9
S75 0.5 2.1
M95 0.6 2
L12 0.5 1.9
• 3-phase LSA 44.2: 4-pole, AREP
excitation
Resistances at 20 °C (Ω)
LSA
44.2
Stator
L/N Rotor Wind.
X1,X2
Wind.
Z1,Z2 Field Armat.
VS3 0.046 2.51 0.3 0.5 4.6 0.5
VS45 0.046 2.51 0.3 0.5 4.6 0.5
S7 0.036 2.91 0.21 0.32 4.6 0.5
S75 0.033 2.91 0.21 0.32 4.6 0.5
M95 0.024 3.32 0.17 0.28 4.6 0.5
L12 0.019 3.66 0.16 0.21 4.6 0.5
Field excitation current i exc (A) - 400 V - 50 Hz
«i exc»: excitation current of the exciter eld
LSA 44.2 no load at load
VS3 1 3.6
VS45 1 4.2
S7 1 3.8
S75 1 4.2
M95 1.2 4
L12 1 3.8
• Dedicated single-phase LSA 44.2:
4-pole, SHUNT excitation (60 Hz only)
Resistances at 20 °C (Ω)
LSA 44.2 Stator L/N Rotor Field Armature
VS3 0.0194 2.51 18.4 0.5
VS45 0.0194 2.51 18.4 0.5
S7 0.0140 2.91 18.4 0.5
M95 0.0088 3.32 18.4 0.5
Field excitation current i exc (A) - 240 V - 60 Hz
«i exc»: excitation current of the exciter eld
LSA 44.2 no load at load
VS3 0.44 1.18
VS45 0.44 1.25
S7 0.43 1.2
M95 0.55 1.28
• Table of weights
(values given for information only)
LSA 43.2 Total weight (kg) Rotor (kg)
S1 220 76
S15 220 76
S25 220 76
S35 240 80
M45 270 90
L65 290 102
L8 330 120
LSA 44.2 Total weight (kg) Rotor (kg)
VS3 405 140
VS45 405 140
S7 460 165
S75 460 165
M95 515 185
L12 570 210
After operational testing, it is essential to
replace all access panels or covers.

19
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
5 - SPARE PARTS
5.1 - First maintenance parts
Emergency repair kits are available as an
option.
They contain the following items:
Emergency kit SHUNT ALT 432 KS 001
AVR R 250 -
Diode bridge assembly -
Surge suppressor -
Emergency kit AREP ALT 432 KS 002
AVR R 450 -
Diode bridge assembly -
Surge suppressor -
Single-bearing kit ALT 432 KB 002
Non drive end bearing -
«O» ring -
Preloading (wavy) washer -
Double-bearing kit ALT 432 KB 001
Non drive end bearing -
Drive end bearing -
«O» ring -
Preloading (wavy) washer -
Single-bearing kit ALT 442 KB 002
Non drive end bearing -
«O» ring -
Preloading (wavy) washer -
Double-bearing kit ALT 442 KB 001
Non drive end bearing -
Drive end bearing -
«O» ring -
Preloading (wavy) washer -
5.3 - Accessories
• Space heater for use when stopped
The space heater must run as soon as the
alternator stops. It is installed at the rear of
the machine. Its standard power is 250W
with 220V or 250W with 110V on request.
Warning: the power supply is present
when the machine has stopped.
• Temperature sensors 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 shields.
These sensors must be linked to adapted
sensing relays (supplied optionally).
Cold resistance of cold thermistor sensors:
100 to 250 Ω per sensor.
• Connection accessories
- 12-wire machines : coupling (F)
3 exible SHUNTS
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 machine 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 machines, 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.
After operational testing, it is essential
to replace all access panels or covers.

20
LEROY-SOMER 2013.01 / k
Installation and maintenance
LSA 43.2/44.2 - 4 POLES
ALTERNATORS
3434 en -
5.4 - Exploded view, parts list and tightening torque
• LSA 43.2 / 44.2 single-bearing
343
349
347
70
79
90
36
51
48 59
1
124
41
47
198
100
107
91
37
4
16 15
15
30
33
322
324
325
325
320
323
320
49
28
207
120
217