LSA 44.

Low Voltage Alternator - 4 pole

Installation and maintenance
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LSA 44.3
Low Voltage Alternator - 4 pole
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 a) During operation, do not allow anyone

Before using your machine for the first time, to stand in front of the air outlet guards,
it is important to read the whole of this in case anything is ejected from them.
installation and maintenance manual. b) Do not allow children younger than 14
to go near the air outlet guards.
All necessary operations and interventions
on this machine must be performed by a A set of self-adhesive stickers depicting the
qualified technician. various warning symbols is included with
this maintenance manual. They should be
Our technical support service will be pleased positioned as shown in the drawing below
to provide any additional information you once the machine has been fully installed.
may require.
The various operations described in this
manual are accompanied by recommenda- WARNING
tions or symbols to alert the user to potential The alternators must not be put into
risks of accidents. It is vital that you unders- service until the machines in which they
tand and take notice of the following warning are to be incorporated have been
symbols. declared compliant with EC Directives
plus any other directives that may be
WARNING applicable.
This manual is to be given to the end
Warning symbol for an operation capable user.
of damaging or destroying the machine The range of electric alternators and
or surrounding equipment. their derivatives, manufactured by us or
on our behalf, comply with the technical
requirements of the customs Union
directives (EAC).

Warning symbol for general danger to

personnel. © - We reserve the right to modify the
characteristics of this product at any time in
order to incorporate the latest technological
developments. The information contained
in this document may therefore be changed
without notice.
Warning symbol for electrical danger to
personnel. This document may not be reproduced in
any form without prior authorisation.
All brands and models have been registered
SAFETY INSTRUCTIONS and patents applied for.
We wish to draw your attention to the
following 2 safety measures which must be
complied with:

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LSA 44.3
Low Voltage Alternator - 4 pole
CONTENTS
1 - RECEIPT.............................................................................................................................4
1.1 - Standards and safety measures................................................................................ 4
1.2 - Inspection.................................................................................................................. 4
1.3 - Identification.............................................................................................................. 4
1.4 - Storage...................................................................................................................... 4
1.5 - Applications............................................................................................................... 4
1.6 - Usage restrictions...................................................................................................... 4

2 - TECHNICAL CHARACTERISTICS....................................................................................5
2.1 - Electrical characteristics............................................................................................ 5
2.2 - Mechanical characteristics........................................................................................ 5

3 - INSTALLATION..................................................................................................................7
3.1 - Assembly................................................................................................................... 7
3.2 - Checks prior to first use............................................................................................. 8
3.3 - Terminal connection diagrams................................................................................... 8
3.4 - Commissioning.........................................................................................................11
3.5 - Setting up.................................................................................................................11

4 - SERVICING - MAINTENANCE.........................................................................................12
4.1 - Safety measures...................................................................................................... 12
4.2 - Routine maintenance............................................................................................... 12
4.3 - Bearings.................................................................................................................. 13
4.4 - Mechanical defects.................................................................................................. 13
4.5 - Electrical faults........................................................................................................ 14
4.6 - Dismantling, reassembly......................................................................................... 16
4.7 - Installation & maintenance of the PMG................................................................... 17
4.8 - Table of characteristics............................................................................................ 18

5 - SPARE PARTS.................................................................................................................20
5.1 - First maintenance parts........................................................................................... 20
5.2 - Technical support service........................................................................................ 20
5.3 - Accessories............................................................................................................. 20
5.4 - Exploded views, parts list and tightening torque..................................................... 21

Disposal and recycling instructions

EC Declaration

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LSA 44.3
Low Voltage Alternator - 4 pole
1 - RECEIPT 1.4 - Storage
1.1 - Standards and safety Prior to commissioning, machines should
measures be stored:
- away from humidity (< 90%); after a long
Our alternators comply with most period of storage, check the machine
international standards. insulation. To prevent the bearings from
See the EC Declaration of Incorporation on becoming marked, do not store in an
the last page. environment with significant vibration.
1.2 - Inspection 1.5 - Application
On receipt of your alternator, check that it This alternator is mainly designed to
has not suffered any damage in transit. If produce electricity in the context of
there are obvious signs of knocks, contact applications involving the use of
the transporter (you may be able to claim generators.
on their insurance) and after a visual
check, turn the machine by hand to detect 1.6 - Usage restrictions
any malfunction. Use of the machine is restricted to operating
conditions (environment, speed, voltage,
1.3 - Identification power, etc) compatible with the characteri-
The alternator is identified by means of a stics indicated on the nameplate.
nameplate fixed on the machine (see
drawing).
Make sure that the nameplate on the
machine conforms to your order.
So that you can identify your alternator
quickly and accurately, we suggest you fill in
its specifications on the nameplate below.

Model LSA Freq. Hz

S/N Date Speed min-1
12345678910
Enclosure Protection Voltage V
Phase
Th. Class Altitude
Connection
Weight PF
kVA
AVR Excitation Cont.
BR kW IEC 60034 - 1& 5
Excitation No Load Full Load 40°C ISO 8528 - 3
A
415 v / 40°C NEMA MG1 - 32 & 33
kVA
Std by.
DE bearing PR kW
LSA 000-1-148 a

NDE bearing 27°C

A

MOTEURS LEROY-SOMER
2 BD MARCELLIN LEROY - 16000 ANGOULÊME - FRANCE
www.leroy-somer.com Scan the code or go to
GEN.LS1.DO
Made in Europe by Leroy-Somer to check product data

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LSA 44.3
Low Voltage Alternator - 4 pole
2 - TECHNICAL 2.2 - Mechanical characteristics
CHARACTERISTICS - Steel frame
- Cast iron end shields
2.1 - Electrical characteristics - Protected ball bearings, greased for life
This alternator is a machine without - Mounting arrangement: single bearing
sliprings or revolving armature brushes, with standard feet and SAE flanges/
wound as “2/3 pitch”, 4 or 12-wire, with coupling discs, two-bearing with SAE flange
class H insulation and a field excitation and standard cylindrical shaft extension
system available in either SHUNT, AREP or - Drip-proof machine, self-cooled
PMG version (see diagrams and AVR - Degree of protection: IP 23
manuals).
• Mechanical options
• Electrical options - Air inlet filter
- Stator temperature detection sensors - IP 44 protection
- Space heaters
- R791 interference suppression

• SHUNT dedicated single-phase 4-wire

MAIN FIELD STATOR: 4-wire (marking T1 to T4)

T1 T3
EXCITER
Varistor

Armature

T2 T4
Field

R250 Power supply /

Detection

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LSA 44.3
Low Voltage Alternator - 4 pole
• SHUNT three-phase 12-wire
MAIN FIELD STATOR: 12-wire (marking T1 to T12)

T1 T7 T2 T8 T3 T9
EXCITER

Varistor
Armature
5+ 6-
T4 T10 T5 T11 T6 T12
Field

R250 Power supply / Detection

• AREP three-phase 12-wire

MAIN FIELD STATOR: 12-wire (marking T1 to T12)
Auxiliary windings
T1 T7 T2 T8 T3 T9
EXCITER
Varistor

Armature
5+ 6-
T4 T10 T5 T11 T6 T12
Field

D350 Voltage reference

• PMG three-phase 12-wire

MAIN FIELD STATOR: 12-wire (marking T1 to T12)

T1 T7 T2 T8 T3 T9
EXCITER
Varistor

PMG

Armature
5+ 6-
T4 T10 T5 T11 T6 T12
Field

D350 Voltage reference

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LSA 44.3
Low Voltage Alternator - 4 pole
3 - INSTALLATION • Single-bearing coupling
Personnel undertaking the various Before coupling, check the compatibility
operations indicated in this section must between the alternator and the engine by
wear personal protective equipment performing:
appropriate for mechanical and electrical - undertaking a torsional analysis of the
hazards. transmission (alternators data are available
on request),
3.1 - Assembly - checking the dimensions of the flywheel
and its housing, the flange, coupling discs
and offset.
WARNING
All mechanical handling operations When coupling the alternator to the
must be undertaken using suitable prime mover, do not use the fan to turn
equipment and the machine must be the alternator or rotor.
horizontal. Check how much the machine The holes of the coupling discs should
weighs before choosing the lifting tool. be aligned with the flywheel holes by
During this operation, do not allow cranking the engine.
anyone to stand under the load. Make sure the machine is securely
bedded in position during coupling.
• Handling Check that there is lateral play on the
The generously-sized lifting eyes are for crankshaft.
handling the alternator only. They must not • Double-bearing coupling
be used to lift the genset. The choice of - Semi-flexible coupling
lifting hooks or handles should be determined Careful alignment of the machines is
by the shape of the lifting eyes. Choose a recommended, checking that the lack of
lifting system which respects the integrity concentricity and parallelism of both parts
and the environment of the machine. of the coupling do not exceed 0.1 mm.
This alternator has been balanced with a
During this operation, do not allow 1/2 key.
anyone to stand under the load. • Location
The location where the alternator is placed
must be ventilated to ensure that the
ambient temperature cannot exceed the
data on the nameplate.

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LSA 44.3
Low Voltage Alternator - 4 pole
3.2 - Checks prior to first use 3.3 - Terminal connection diagrams
• Electrical checks To modify the connection, change the
position of the stator cables on the terminals.
The winding code is specified on the
nameplate.

Under no circumstances should an

alternator, new or otherwise, be operated
if the insulation is less than 1 megohm Any intervention on the alternator
for the stator and 100,000 ohms for the terminals during reconnection or checks
other windings. should be performed with the machine
There are 2 possible methods for restoring stopped. In no case should the internal
the above minimum values. connections in the terminal box be
a) Dry out the machine for 24 hours in a subjected to stresses due to cables
drying oven at a temperature of 110 °C connected by the user.
(without the regulator).
b) Blow hot air into the air intake, having
made sure that the machine is rotating with • SHUNT dedicated single-phase 4-wire
the exciter field disconnected.
Connection
Note : Prolonged standstill
Series connection
In order to avoid these problems, we
recommend the use of space heaters, as T1 T2 T3 T4

well as turning over the machine from time

DE
to time. Space heaters are only really
110V
effective if they are working continuously M

while the machine is stopped. L

R250

T2 T4
L
WARNING 0V T3
T1

NDE
Ensure that the alternator has the degree
of protection matching the defined
environmental conditions.
• Mechanical checks
Before starting the machine for the first time,
check that:
- all fixing bolts are tight,
- the length of bolt and the tightening torque
are correct,
- the cooling air is drawn in freely,
- the protective grille and housing are cor-
rectly in place,
- the standard direction of rotation is clock-
wise as seen from the drive 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).

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LSA 44.3
Low Voltage Alternator - 4 pole
• SHUNT, AREP or PMG three-phase 12-wire
Connection codes Voltage / Detection Factory connection

A 3PH L1(U)
Winding 50 Hz 60 Hz T12
T6 T11

T1 T7 6 190 - 208 190 - 240 T5 N

T4 T10
7 220 - 230 -
T9 L3(W)
T4 T10 N 8 - 190 - 208 T3
T12 T5
T8 L2(V)
T9 T2
R250 :
T11 T2
0 => (T8) / 110 V => (T11)
T6
D350 : T7 L1(U)
L3(W) T3 T8 L2(V) U => T1 / V => T2 / W => T3 T1 NDE

D 3PH T1
L1(U) Winding 50 Hz 60 Hz T11
T12

6 380 - 415 380 - 480 N

T4
T10
T7 7 440 - 460 -
T9 L3(W)
N 8 - 380 - 416 T6 T3
T10
T12
T8 L2(V)
T9 R250 :
T11 T5 T5 T2
0 => (T8) / 110 V => (T11)
T3 T6 T8 T2
D350 : T7 L1(U)
L3(W) L2(V) U => T1 / V => T2 / W => T3 T4
T1 NDE

F 1PH Winding 50 Hz 60 Hz
or L1(U)
3PH T12 T1 6 220 - 240 220 - 240
T6 T3

T9 T4
7 250 - 260 - T9 T11
L L3(W)
T6 T7
8 200 220 - 240 T5
L
T8 T10 L2(V)
T3 T10
R250 : T4 T2
L3(W) L2(V)
T11 T8 T5 T2 0 => (T8) / 110 V => (T11)
L L T7 T12 L1(U)
M D350 :
Voltage LM = 1/2 voltage LL U => T1 / V => T2 / W => T3 T1
NDE

Winding 50 Hz 60 Hz
FF T4 T11
1PH
T7
6 220 - 240 220 - 240
T2 T6 T8 T12 T3
7 250 - 260 - T9 L
T3
T5 T11 T9 8 200 220 - 240 T10

T1 T4 T7 T8 T6
T10
L L R250 :
M T12 T2
0 => (T1) / 110 V => (T4)
T5 L
D350 :
Voltage LM = 1/2 voltage LL NDE
V => T1 / W => T10 T1

In case of reconnection, ensure that AVR voltage detection is correct!

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LSA 44.3
Low Voltage Alternator - 4 pole
• SHUNT, AREP or PMG three-phase 12-wire
Connection codes Voltage / Detection Factory connection

G 1PH Winding 50 Hz 60 Hz T11

T5
6 220 - 240 220 - 240 T4 M
T6 T1 M T10
T12
T7
7 250 - 260 -
T9 L
T4
T3 8 200 220 - 240 T3
T2
T10
T9 T5 T8 L
L
R250 :
L T12 T2
T11 T8 0 => (T8) / 110 V => (T11)
T7 T6
D350 :
Voltage LM = 1/2 voltage LL V => T2 / W => T3 T1 NDE

SINGLE-PHASE 4-WIRE - DEDICATED WINDING type M or M1

Series connection Voltage 50/60Hz Output

L-L L-M Link L L M
T1 T2 T3 T4
220 110
230 115 T2 - T3 T1 T4 T2 - T3
M 240 120
L L
R250 : 0 => (T1) / 110 V => (T2)

Warning: parallel connection not possible.

When coupling alternators in parallel with connected neutral,

it may be necessary to use a reactance (please contact us).
Tightening torque of terminal (M10 / 20 Nm +/-3).

• Option connection diagram

Remote voltage potentiometer

ST
Voltage adjustment
via remote potentiometer

Anti condensation heater Thermistor temperature (PTC)

103 130 °C
Ph1 Blue wire

101 150 °C
Ph2 Black wire
102
180 °C
Ph3 Red/white wire
104

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LSA 44.3
Low Voltage Alternator - 4 pole
• Connection checks 3.4 - Commissioning

Electrical installations must comply with

the current legislation in force in the The machine can only be started up and
country of use. used if the installation is in accordance
Check that: with the regulations and instructions
- The residual circuit-breaker conforms to
legislation on protection of personnel, in defined in this manual.
force in the country of use, and has been The machine is tested and set up at the
correctly installed on the alternator power factory. When first used with no load, make
output as close as possible to the alternator. sure that the drive speed is correct and
(In this case, disconnect the wire of the stable (see the nameplate). With the
interference suppression module linking the
neutral). regreasable bearing option, we recommend
- Any protection devices in place have not greasing the bearings at the time of
been tripped. commissioning (see section 4.3).
- If there is an external AVR, the connections On application of the load, the machine
between the alternator and the cabinet are should achieve its rated speed and voltage;
made in accordance with the connection however, in the event of abnormal operation,
diagram. the machine setting can be altered (follow
- There is no short-circuit phase-phase or the adjustment procedure in section 3.5). If
phase-neutral between the alternator output the machine still operates incorrectly, the
terminals and the generator set control
cabinet (part of the circuit not protected by cause of the malfunction must be located
circuitbreakers or relays in the cabinet). (see section 4.5).
- The machine should be connected with the
busbar separating the terminals as shown in 3.5 - Setting up
the terminal connection diagram.

- The alternator earth terminal inside the

terminal box is connected to the electrical
earth circuit The various adjustments during tests
- The earth terminal is connected to the must be made by a qualified engineer.
frame. Ensure that the drive speed specified on
The connections inside the terminal box
must never be subjected to stress due to the nameplate is reached before
cables connected by the user. commencing adjustment.
After operational testing, replace all
access panels or covers.
The AVR is used to make any adjustments
to the machine.
Diameter M6 M8 M10 M12
Torque 4 Nm 10 Nm 20 Nm 35 Nm
Tolerance ± 15%

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LSA 44.3
Low Voltage Alternator - 4 pole
4 - SERVICING - MAINTENANCE WARNING
4.1 - Safety measures Do not use: trichlorethylene, perchlo-
Servicing or troubleshooting must be
rethylene, trichloroethane or any alkaline
carried out strictly in accordance with
products.
instructions so as to avoid the risk of
accidents and to maintain the machine in
its original state.
These operations must be performed at
a cleaning station, equipped with a
vacuum system that collects and flushes
All such operations performed on the
out the products used.
alternator should be undertaken by
The insulating components and the
personnel trained in the commissioning,
servicing and maintenance of electrical impregnation system are not at risk of
and mechanical components, who must damage from solvents. Avoid letting the
wear personal protective equipment cleaning product run into the slots.
appropriate for mechanical and electrical Apply the product with a brush, sponging
hazards. frequently to avoid accumulation in the
Before any intervention on the machine, housing. Dry the winding with a dry cloth. Let
ensure that it cannot be started by a manual any traces evaporate before reassembling
or automatic system and that you have the machine.
understood the operating principles of the • Mechanical servicing
system.
WARNING
Cleaning the machine using water or a
highpressure washer is strictly prohi-
Warning : During and after running, the
bited. Any problems arising from such
alternator will reach temperatures hot
enough to cause injury, such as burns. treatment are not covered by our
warranty.
Degreasing: Use a brush and detergent
4.2 - Routine maintenance (suitable for paintwork).
Dusting: Use an air gun.
• Checks after start-up
If the machine is fitted with air inlet and outlet
After approximately 20 hours of operation,
check that all fixing bolts on the machine are filters, the maintenance personnel should
still tight, plus the general state of the clean them routinely at regular intervals. In
machine and the various electrical the case of dry dust, the filter can be cleaned
connections in the installation. using compressed air and/or replaced if it is
clogged.
• Electrical servicing After cleaning the alternator, it is essential to
Commercially-available volatile degreasing check the winding insulation (see sections
agents can be used. 3.2 and 4.5).

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LSA 44.3
Low Voltage Alternator - 4 pole
4.3 - Bearings
The bearings are permanently greased Approximate life of the grease (depending on use) =
20,000 hours or 3 years.

4.4 - Mechanical defects

Fault Action
Excessive overheating of one or - If the bearing has turned blue or if the grease has turned
both bearings black, change the bearing.
Bearing (bearing temperature 80°C above - Bearing not fully locked (abnormal play in the bearing cage)
the ambient temperature) - End shields incorrectly aligned
- Air flow (inlet-outlet) partially clogged or hot air is being
Excessive overheating of recycled from the alternator or engine
Abnormal alternator frame (more than - Alternator operating at too high a voltage (>105% of Un on
temperature 40° C above the ambient load)
temperature) - Alternator overloaded
- Misalignment (coupling)
Too much vibration - Defective mounting or play in coupling
Vibrations - Rotor balancing fault (Engine - Alternator)
Excessive vibration and humming - Phase imbalance
noise coming from the machine - Stator short-circuit

- System short-circuit
- Misparalleling
Alternator damaged by a Possible consequences
Abnormal - Broken or damaged coupling
significant impact, followed by
noise - Broken or bent shaft end
humming and vibration
- Shifting and short-circuit of main field
- Fan fractured or coming loose on shaft
- Irreparable damage to rotating diodes/AVR, surge suppressor

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LSA 44.3
Low Voltage Alternator - 4 pole
4.5 - Electrical faults
Fault Action Effect Check/Cause
The alternator builds up and
its voltage is still correct - Lack of residual magnetism
when the battery is removed
Connect a new
battery of 4 to 12 The alternator builds up but - Check the connection of the voltage reference
No voltage volts to terminals its voltage does not reach to the AVR
at no load on E- and E+, the rated value when the - Faulty diodes
start-up respecting the battery is removed - Armature short-circuit
polarity, for 2 to 3
The alternator builds up but -- Faulty
seconds AVR
its voltage disappears when - Field windings open circuit (check winding)
Revolving field coil open circuit (check the
the battery is removed resistance)
Check the AVR connections (AVR may be
faulty)
- Field windings short-circuited
Correct speed - Rotating diodes burnt out
Voltage too Check the drive - Revolving field coil short-circuited (check the
low speed resistance)
Increase the drive speed (do not touch the AVR
Speed too low voltage pot. (P2) before running at the correct
speed)
Voltage too Adjust AVR voltage Adjustment ineffective - Faulty AVR
high potentiometer
- Check the speed: possibility of cyclic
irregularity
Adjust the
Voltage If no effect: try normal or fast - Loose connections
AVR stability
oscillations stability modes (ST2) - Faulty AVR
potentiometer - Speed too low when on load (or AVR LAM set
too high)
Voltage between E+ and E-
(DC)
Voltage Run at no load and SHUNT < 20V - AREP / PMG - Check the speed (or AVR LAM set too high)
correct at no check the voltage < 10V
load and too between E+ and
Voltage between E+ and E- -- Faulty
low when on E- on the AVR rotating diodes
SHUNT > 30V - AREP / PMG Short-circuit
load (*) in the revolving field coil (check
the resistance)
> 15V - Faulty exciter armature (check the resistance)
Check the AVR, the - Exciter winding open circuit
Voltage surge suppressor, - Faulty exciter armature
disappears the rotating diodes, The voltage does not return - Faulty AVR
during and replace any to the rated value - Revolving field coil open circuit or short-
operation defective circuited
components
(*) During single-phase operation, check that the sensing wires from the AVR are connected to the correct output terminals.

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LSA 44.3
Low Voltage Alternator - 4 pole
• Checking the winding Assembly A: Connect a 12 V battery in
You can check the winding insulation by series with a rheostat of approximately
performing a high voltage test. In this case, 50 ohms - 300 W and a diode on both exciter
you must disconnect all AVR wires. field wires (5+) and (6-).
ASSEMBLY A
6 - Field 5+
WARNING
1A diode Rh. 50 -300W
Damage caused to the AVR in such
conditions is not covered by our
warranty. +
-
• Checking the diode bridge
A diode in good working order should allow 12V battery
the current to flow only in the anode-to-
cathode direction. Assembly B: Connect a “Variac” variable
Anode
+ -
Cathode
power supply and a diode bridge on both
+ -
exciter field wires (5+) and (6-).
+ -
Both these systems should have
characteristics which are compatible with
A C
A C the field excitation power of the machine
(see the nameplate).
3) Run the unit at its rated speed.
4) Gradually increase the exciter field
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.
• Checking the windings and rotating sensing, auxiliary windings).
diodes using separate excitation
ASSEMBLY B
6 - Field 5+

40
50 60 +
30

70

1A diode
During this procedure, make sure that
20

80

the alternator is disconnected from any

10

90

0 100

external load and inspect the terminal DC

AC -
box to check that the connections are Variac 12V
220V
fully tightened.
1) Stop the unit, disconnect and isolate the
AVR wires.
2) There are two ways of creating an
assembly with separate excitation.

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LSA 44.3
Low Voltage Alternator - 4 pole
4.6 - Dismantling, reassembly - Check all modules using an ohmmeter or a
battery lamp.
WARNING - Refit the modules.
- Refit the air intake grille (51).
During the warranty period, this
operation should only be carried out in • Access to connections and the
an approved workshop or in our factory, regulation system
otherwise the warranty may be
invalidated. The terminals are accessed directly by
Whilst being handled, the machine removing the terminal box lid (48).
should remain horizontal (rotor not
locked in position). Check how much the • Replacing the NDE bearing on single
machine weighs before choosing the bearing machines
lifting method. Dismantling
- Remove the terminal box lid (48).
- Unscrew the fixing clamps on the power
output cables, remove the connector from
the exciter.
- Remove the nuts on the tie rods.
- Remove the NDE shield (36) using a puller:
eg. U.32 - 350 (Facom).
- Remove the antifriction bearing (70) using
a screw puller.

• Tools required
To fully dismantle the machine, we
recommend using the tools listed below: Reassembly
- 1 ratchet spanner + extension - Heat the inner slipring of a new bearing by
- 1 torque wrench induction or in a drying oven at 80°C (do not
- 1 set of flat spanners: 7, 8, 10, 12 mm use an oil-bath) and fit it to the machine.
- 1 socket set: 8, 10, 13, 16, 18, 21, 22, - Place the preloading wavy washer (79) in
24 mm the shield and fit a new “O” ring seal (349).
- 1 Allen key: size 5 (eg. Facom: ET5), size 6 Refit the NDE shield and pass the bundle of
(ET6), size 10 (ET10, size 14 (ET14) wires between the top bars of the shield.
- 1 socket TORX bit T20 and T30 - Refit the fixing clamps on the cables and
- 1 puller (U35)/(U32/350) the exciter connector.
• Screw tightening torque - Replace the terminal box lid (48) and also
the earth continuity screw (29).
See section 5.4.
• Access to diodes
- Remove the air intake grille (51).

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LSA 44.3
Low Voltage Alternator - 4 pole
• Accessing the main field and stator

NDE shield Dismantling

Follow the procedure for dismantling the
Rotor bearings.
Threaded rod - 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 or dismantle it.
- Remove the revolving field coil (rotor) and
place on special V-shaped supports.

WARNING NOTE: If intervention is required on the

main field (rewinding, replacement of
When dismantling the shields, you will components), the rotor assembly must
need to change the antifriction bearings, be rebalanced.
the “O” ring seal, the preloading (wavy)
washer and adhesive paste. Reassembling the revolving field coil
- Follow the dismantling procedure in
• Replacing the DE bearing reverse order.
Dismantling Take care not to knock the windings when
- Uncouple the alternator from the prime refitting the rotor in the stator.
mover. - Refit the fan with its fixing screws on the
- Remove the assembly screws. hub.
- Remove the DE shield (30). Follow the procedure for reassembling the
- Remove the NDE shield. bearings.
- Remove both antifriction bearings (60) and
(70) using a puller with a central screw.
Reassembly 4.7 - Installation and maintenance of
- Heat the new bearings by induction or in a the PMG
drying oven at 80°C (do not use an oil-bath) The PMG reference is PMG 7.
and fit them to the machine. See the PMG manual ref : 4211.
- Check that both the preloading wavy
washer (79) and the new “O” ring seal (349)
have been fitted on the NDE shield (36).
Refit the NDE shield and pass the bundle of
wires between the top bars of the shield.
- Refit the DE shield (30) and tighten the
fixing screws.
- Check that the alternator assembly is
correctly mounted and that all screws are
tightened.

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LSA 44.3
Low Voltage Alternator - 4 pole
4.8 - Table of characteristics • Three-phase: 4-pole, AREP excitation
Table of average values: Resistances at 20 °C (Ω)
Alternator - 4 pole - 50 Hz - Standard winding
Stator Exciter Exciter
No. 6 (12-wire) and M or M1 (4-wire) Type Rotor
L/N field armature
connected in dedicated single-phase (400 V
for the excitation values). S2/S3 0.0503 2.354 7.262 0.790
The voltage and current values are given for S4/S5 0.0390 2.642 8.068 0.920
no-load operation and operation at rated M6 0.0335 2.893 8.068 0.920
load with separate field excitation. M8 0.0287 3.145 8.068 0.920
All values are given to within ± 10% and may L10 0.0236 3.433 8.068 0.920
be changed without prior notification (for
L12 0.0236 3.433 8.068 0.920
exact values, consult the test report).
VL13/VL14 0.0188 4.044 5.307 1.149
For 60 Hz machines, the “i exc” values are
approximately 5 to 10 % lower.
Resistance of auxiliary windings at
20 °C (Ω)
• Three-phase: 4-pole, SHUNT excitation
Type X1, X2 Z1, Z2
Resistances at 20 °C (Ω)
S2/S3 0.341 0.627
Stator Exciter Exciter S4/S5 0.305 0.571
Type Rotor
L/N field armature M6 0.289 0.575
S2/S3 0.0503 2.354 11.647 0.790 M8 0.271 0.559
S4/S5 0.0390 2.642 12.942 0.920 L10 0.247 0.525
M6 0.0335 2.893 12.942 0.920 L12 0.247 0.525
M8 0.0287 3.145 12.942 0.920 VL13/VL14 0.238 0.547
L10 0.0236 3.433 12.942 0.920
L12 0.0236 3.433 12.942 0.920 Field excitation current i exc (A)
VL13/VL14 0.0188 4.044 5.307 1.149 400V - 50 Hz
“i exc”: excitation current of the exciter field
Field excitation current i exc (A) Type No load At rated load
400V - 50 Hz S2 0.97 2.67
“i exc”: excitation current of the exciter field
S3 0.97 3
Type No load At rated load S4 0.94 2.71
S2 0.75 2.07 S5 0.94 2.98
S3 0.75 2.33 M6 0.85 3.18
S4 0.73 2.11 M8 0.81 3.05
S5 0.73 2.31 L10 0.86 3.15
M6 0.66 2.47 L12 0.86 3.49
M8 0.62 2.37 VL13 0.78 3.17
L10 0.67 2.45 VL14 0.78 3.53
L12 0.67 2.71
VL13 0.78 3.17
VL14 0.78 3.53

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LSA 44.3
Low Voltage Alternator - 4 pole
• Dedicated single-phase M: 4-pole, • Table of weights
SHUNT excitation - 50 Hz (values given for information only)

Resistances at 20 °C (Ω) Type Total weight (kg) Rotor (kg)

Stator Exciter Exciter S2/S3 301 123
Type Rotor S4/S5 338 141
L/N field armature
S3 0.012 2.354 11.647 0.790 M6 374 156
S5 0.0093 2.642 12.942 0.920 M8 404 168
M8 0.0068 3.145 12.942 0.920 L10 439 183
L12 439 184
Field excitation current i exc (A) VL13/VL14 555 231
230V - 50 Hz
“i exc”: excitation current of the exciter field
Type No load At rated load
S3 0.7 1.5
S5 0.7 1.5
M8 0.6 1.3
After operational testing, it is essential to
replace all access panels or covers. Don’t
• Dedicated single-phase M1: 4-pole, forget the screw (29) earth continuity.
SHUNT excitation - 60 Hz
Resistances at 20 °C (Ω)
Stator Exciter Exciter
Type Rotor
L/N field armature
S3 0.0084 2.354 11.647 0.790
S5 0.0059 2.642 12.942 0.920
M6 0.0063 2.893 12.942 0.920
L10 0.0042 3.433 12.942 0.920

Field excitation current i exc (A)

240V - 60 Hz
“i exc”: excitation current of the exciter field
Type No load At rated load
S3 0.9 1.8
S5 1 2
M6 0.6 1.7
L10 0.7 1.5

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LSA 44.3
Low Voltage Alternator - 4 pole
5 - SPARE PARTS In the event of failure to comply with this
advice, the manufacturer cannot be held
5.1 - First maintenance parts responsible for any damage.
Emergency repair kits are available as an
option.
They contain the following items:
Emergency kit SHUNT 4891855
AVR R250 - After operational testing, it is essential
Diode bridge assembly - to replace all access panels or covers.
Surge suppressor -
Emergency kit AREP/PMG 5155834 5.3 - Accessories
AVR D350 - • Space heater for use when stopped
Diode bridge assembly - The space heater must run as soon as the
Surge suppressor - alternator stops. It is installed at the rear of
the machine. Its standard power is 100W
Single-bearing kit 4879454 with 220V or 100W with 110V on request.
Non drive end bearing -
«O» ring -
Preloading (wavy) washer -
Double-bearing kit 4877030 Warning: the power supply is present
Non drive end bearing - when the machine has stopped.
Drive end bearing -
«O» ring - • Temperature sensors with thermistors
Preloading (wavy) washer - (PTC)
These are thermistor triplets with a positive
temperature coefficient installed in the
5.2 - Technical support service stator winding (1 per phase). There can be a
Our technical support service will be maximum of 2 triplets in the winding (at 2
pleased to provide any additional levels: warning and trip) and 1 or 2
information you may require. thermistors in the shields.
These sensors must be linked to adapted
For all spare parts orders or technical sensing relays (supplied optionally).
support requests, send your request to Cold resistance of cold thermistor sensors:
service.epg@leroy-somer.com or your 100 to 250 Ω per sensor.
nearest contact, whom you will find at
www.lrsm.co/support indicating the comp-
lete type of machine, its number and the
information indicated on the nameplate.

Part numbers should be identified from the

exploded views and their description from
the parts list.

To ensure that our products operate correctly

and safely, we recommend the use of
original manufacturer spare parts.

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LSA 44.3
Low Voltage Alternator - 4 pole
5.4 - Exploded views, parts list and tightening torque
• Single bearing

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LSA 44.3
Low Voltage Alternator - 4 pole
• Two-bearing

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LSA 44.3
Low Voltage Alternator - 4 pole
Screw Torque Screw Torque
Ref. Qty Description Ref. Qty Description
Ø N.m Ø N.m

1 1 Stator assembly - - 67 1 Circlips - -

4 1 Rotor assembly - - 68 1 Inner bearing retainer M6 8.3

Non drive end (NDE)

15 1 Fan M6 5 70 1 - -
bearing
Lifting eye (only
Preloading (wavy)
21 1 with LSA 44.3 VL13 M10 40 79 1 - -
washer
and VL14)

22 1 Shaft extension key - - 90 1 Exciter field (stator) M6 10

Exciter armature
28 1 Earth terminal M6* 10** 100 1 - -
(rotor)

29 1 Earth continuity screw M6 10 107 1 Diode module support M5 6

30 1 Drive end (DE) shield M12 69 124 1 Terminal block M6 5

Two-bearing adaptor Voltage regulator

32 1 - - 198 1 M5 6
ring (AVR)

33 2 Air outlet grille M6 5 320 1 Coupling sleeve - -

Non drive end (NDE)

36 1 M14 90*** 322 2 Coupling disc M16 300
shield
Plastic cap (only with
40 2 - - 325 - Spacer shim - -
LSA 44.3 L12)
Terminal box front or Diode module
41 2 M5 5 343 3 M5 3
rear panel assembly
Surge suppressor
48 1 Terminal box lid M5 5 347 1 M6 4
(+ PCB)

51 2 Air intake grille M5 3.6 349 1 O ring seal - -

Terminal box side

53 1 Sealing cap - - 367 2 - -
panel
Drive end (DE)
60 1 - -
bearing

* M12 (only with LSA 44.3 VL13 and VL14)

** 69 N.m (only with LSA 44.3 VL13 and VL14)
***130 N.m (only with LSA 44.3 VL13 and VL14)

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LSA 44.3
Low Voltage Alternator - 4 pole
Disposal and recycling instructions All materials listed above need special
We are committed to limiting the treatment to separate waste from
environmental impact of our activity. We reclaimable materials and should be
continuously monitor our production entrusted to specialist recycling companies.
processes, material sourcing and product
design to improve recyclability and minimise The oil and grease from the lubrication
our environmental footprint. system should be treated as hazardous
These instructions are for information waste and must be treated in accordance
purposes only. It is the user’s responsibility with local legislation.
to comply with local legislation regarding
product disposal and recycling. Our alternators have a specified lifetime of
20 years. After this period, the operation of
Recyclable materials the product should be stopped, regardless
Our alternators are mainly constructed from of its condition. Any further operation after
iron, steel and copper materials, which can this period will be under the sole responsi-
be reclaimed for recycling purposes. bility of the user.
These materials can be reclaimed through a
combination of manual dismantling,
mechanical separation and melting
processes. Our technical support depart-
ment can provide detailed directions on how
to dismantle products on request.

Waste & hazardous materials

The following components and materials
require special treatment and must be
separated from the alternator before the
recycling process:
- electronic materials found in the terminal
box, including the automatic voltage
regulator (198), current transformers (176),
interference suppression module and other
semi-conductors.
- diode bridge (343) and surge suppressor
(347), found on the alternator rotor.
- major plastic components, such as the
terminal box structure on some products.
These components are usually marked with
information concerning the type of plastic.

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LSA 44.3
Low Voltage Alternator - 4 pole

Moteurs Leroy-Somer
Boulevard Marcellin Leroy - CS 10015
16915 Angoulême cedex 9 - France

Angoulême, 1st July 2021

EC Declaration
Moteurs Leroy-Somer declares hereby that the electric generators of the types:
LSA 40 – LSA 42.3 – LSA 44.3 – LSA 46.3 – LSA 47.2 – LSA 47.3 – LSA 49.1 – LSA 49.3 – LSA 50.1 –
LSA 50.2 – LSA 51.2 – LSA 52.2 – LSA 52.3 – LSA 53 – LSA 53.1 – LSA 53.2 – LSA 54 – LSA 54.2 – TAL
040 – TAL 042 – TAL 044 – TAL 046 – TAL 047 – TAL 0473 – TAL 049 – LSAH 42.3 – LSAH 44.3
as well as their derivatives, manufactured by Leroy-Somer or on Leroy-Somer's behalf:

MOTEURS LEROY-SOMER MLS HOLICE STLO.SRO MOTEURS LEROY-SOMER

Boulevard Marcellin Leroy Sladkovskeho 43 1, rue de la Burelle
16015 Angoulême 772 04 Olomouc Boite Postale 1517
France République Tchèque 45800 St Jean de BrayeFrance

LEROY-SOMER ELECTRO- NIDEC INDUSTRIAL AUTOMATION NIDEC INDUSTRIAL AUTOMATION

TECHNIQUE Co., Ltd INDIA PRIVATE Ltd - BANGALORE INDIA PRIVATE Ltd - HUBLI
No1 Aimosheng Road, Galshan Town, #45, Nagarur, Huskur Road #64/A, Main Road,
Cangshan District. Off Tumkur Road, Tarihal IndustrialArea,
Fuzhou, Fujian 350026 Chine Bengaluru-562 162Inde Tarihal, Hubli-580 026 Inde

meet the requirements of the following standards and directives:

Declaration of compliance:
- Low Voltage Directive Nr 2014/35/EU dated 26th February 2014.
- EN and IEC 60034-1, 60034-5 and 60034-22.
- ISO 8528-3 “Reciprocating internal combustion engine driven alternating current generating sets. Part
3. Alternating current generators for generating sets”.

These generators also comply with the ROHS Directive Nr 2011/65/EU dated 8th June 2011 and its Annex II
Nr 2015/863 dated 31st March 2015, as well as the EMC Directive Nr 2014/30/EU dated 26th February 2014.

Declaration of incorporation:
These generators are designed to meet the essential "Partly completed machinery" requirements of Machinery
Directive Nr 2006/42/EC, as well as Annex VII, part B of this directive and the aforementioned standards.

As a result, these "Partly completed machinery" are designed to be incorporated into Electrical Gen-Sets
complying with the Machinery Directive Nr 2006/42/EC dated 17th May 2006.

WARNING:
The here mentioned generators should not be commissioned until the corresponding Gen-Sets have been
declared in compliance with the Directives Nr 2006/42/EC, 2014/30/EU, 2011/65/EU and 2015/863, as well as
with other relevant Directives.

Moteurs Leroy-Somer undertakes to transmit, in response to a reasoned request by the national authorities,
relevant information on the generator.

Technical Managers
J.P. CHARPENTIER – Y. MESSIN

Moteurs Leroy-Somer
Siege social : Boulevard Marcellin Leroy CS 10015 - 16915 Angoulême cedex 9 - France
4152 en - 2021.07 / u
SAS au capital de 38 679 664 € - RCS Angoulême 338 567 258

The contractual EC Declaration of compliance and incorporation can be obtained from your contact on
request.

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LSA 44.3
Low Voltage Alternator - 4 pole

26
 Service & Support

Our worldwide service network of over 80 facilities is at your service.

This local presence is our guarantee for fast and efficient repair, support and
maintenance services.
Trust your alternator maintenance and support to electric power generation experts.
Our field personnel are 100% qualified and fully trained to operate in all environments
and on all machine types.
We have a deep understanding of alternator operation, providing the best value
service to optimise your cost of ownership.
Where we can help:
Design
•Consulting & specification
•Maintenance
contracts

Life Extension
•Reconditioning Start-up
•System upgrade
•Commissioning
•Training

Optimisation
•Monitoring Operation
•System audit •Genuine spare parts
•Repair services

Contact us:
Americas: +1 (507) 625 4011
Europe & rest of the world: +33 238 609 908
Asia Pacific: +65 6250 8488
China: +86 591 88373036
India: +91 806 726 4867
Scan the code or go to:

service.epg@leroy-somer.com www.lrsm.co/support
 www.emersonindustrial.com
www.leroy-somer.com/epg

Linkedin.com/company/leroy-somer
Twitter.com/Leroy_Somer_en
Facebook.com/LeroySomer.Nidec.en
YouTube.com/LeroySomerOfficiel

5056 en - 2021.09 / k