Leroy-Somer Nidec LSAH 42.3 Instruction Manual

LSAH 42.3
Low Voltage Alternator - 4 pole
Installation and maintenance

2
2022.11 / d
Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 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
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 symbolforanoperationcapable
of damaging or destroying the machine
or surrounding equipment.
Warning symbol for general danger to
personnel.
Warning symbol for electrical danger to
personnel.
SAFETY INSTRUCTIONS
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.
WARNING
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.
Sets of self-adhesive stickers depicting the
various warning symbols are 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 EC Directives
plus any other directives that may be
applicable.
This manual is to be given to the end
user.
The range of electric alternators and
their derivatives, manufactured by us or
on our behalf, comply with the technical
requirements of the customs Union
directives.
The alternator is a sub-assembly
delivered without a system of protection
against short-circuits. The protection
must be provided by the circuit-breaker
of the generator, sized to interrupt the
fault current.
© 2022 Moteurs Leroy-Somer SAS
Share Capital: 38,679,664 €, RCS Angoulême
338 567 258.
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.
This document may not be reproduced in any
form without prior authorization.
All brands and models have been registered and
patents applied for.

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 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 - Usage restrictions..................................................................................................... 4
2 - TECHNICAL CHARACTERISTICS .................................................................................. 5
2.1 - Electrical characteristics ........................................................................................... 5
2.2 - Mechanical characteristics ....................................................................................... 5
2.3 - Cooling circuit characteristics ................................................................................... 5
3 - INSTALLATION ................................................................................................................ 6
3.1 - Assembly .................................................................................................................. 6
3.2 - Checks prior to rst use............................................................................................ 6
3.3 - Terminal connection diagrams.................................................................................. 7
3.4 - Commissioning ......................................................................................................... 8
3.5 - Setting up ................................................................................................................. 8
4 - SERVICING - MAINTENANCE......................................................................................... 9
4.1 - Safety measures....................................................................................................... 9
4.2 - Routine maintenance................................................................................................ 9
4.3 - Bearings ................................................................................................................. 10
4.4 - Cooling circuit ......................................................................................................... 10
4.5 - Mechanical defects................................................................................................. 10
4.6 - Electrical faults ........................................................................................................11
4.7 - Dismantling, reassembly ........................................................................................ 13
4.8 - Table of characteristics ........................................................................................... 15
5 - SPARE PARTS ............................................................................................................... 16
5.1 - First maintenance parts .......................................................................................... 16
5.2 - Technical support service ....................................................................................... 16
5.3 - Accessories ........................................................................................................... 16
5.4 - Exploded views, parts list and tightening torque .................................................... 17
Disposal and recycling instructions
EC Declaration

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Electric Power Generation
Model
S/N
Enclosure
Th. Class
Weight
AVR
Date
Protection
Altitude
PF
Excitation
Freq.
Speed
Voltage
Phase
V
min
-1
Hz
kVA
kW
A
kVA
kW
A
Connection
Cont.
BR
40°C
Std by.
PR
27°C
Made in Europe by Leroy-Somer
IEC 60034 - 1& 5
ISO 8528 - 3
NEMA MG1 - 32 & 33
MOTEURS LEROY-SOMER
2 BD MARCELLIN LEROY - 16000 ANGOULÊME - FRANCE
Excitation
415 v / 40°C
DE bearing
NDE bearing
No Load Full Load
www.leroy-somer.com
LSA 000-1-148 a
Scan the code or go to
GEN.LS1.DO
to check product data
12345678910
LSAH IC Code: IC7A1W7
Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
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 su󰀨ered 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.
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, 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 - Applications
This alternator is mainly designed to
produce electricity in the context of
applications involving the use of
generators.
1.6 - Usage restrictions
Use of the machine is restricted to operating
conditions (environment, speed, voltage,
power, etc) compatible with the characteri-
stics indicated on the nameplate.

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
2 - TECHNICAL
CHARACTERISTICS
2.1 - Electrical characteristics
This alternator is a machine without
sliprings or revolving armature brushes,
wound as “2/3 pitch”, 6-wire, with class H
insulation and a eld excitation system
available in AREP version (see diagram
and AVR manual).
• Electrical options
- Stator temperature detection sensors
- Space heaters
- R791 interference suppression
2.2 - Mechanical characteristics
- Steel frame
- Cast iron and aluminum end shields
- Greased for life ball bearings
- Mounting arrangement: single bearing
with standard feet and SAE anges/
coupling discs, two-bearing with SAE ange
and standard cylindrical shaft extension
- Enclosed machine cooled by heat transfer
uid
- Degree of protection: IP 44
Varistor
T1 T2 T3
T4 T5 T6
5+ 6-
D350
STATOR: 6-wire (marking T1 to T6)
Auxiliary windings
MAIN FIELD
Voltage reference
EXCITER
Field
Armature
2.3 - Cooling circuit characteristics
- Cooling method: IC7A1W7
- Type of uid: water + additive
- Operating temperature: 70°C (±5°C)
- Permitted additives: Glycol-type antifreeze
- Maximum level of additives: 50%
- Operating pressure: 3 bar (8 bar maximum)
- pH of water: 7<pH<8
Glycol (or Ethylene glycol) type
antifreeze is a hazardous product which
is harmful to health.
SGH07 SGH08 SIMDUT D2A NFPA 704
1
2 0
Risks:
- H302: Harmful if swallowed
- H373: May cause damage to organs
through prolonged or repeated exposure
Precautions:
- P260: Do not breathe fumes/mist/
vapours
- P301: If swallowed:
- P312: Call a poison centre or doctor/
physician if you feel unwell
- P330: Rinse mouth
Never use methanol or isopropanol-
type antifreeze.
•AREP three-phase 6-wire

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
3 - INSTALLATION
Personnel undertaking the various
operations indicated in this section must
wear personal protective equipment
appropriatefor mechanicaland electrical
hazards.
3.1 - Assembly
All mechanical handling operations
must be undertaken using suitable
equipment and the machine must be
horizontal.Check howmuchthemachine
weighs before choosing the lifting tool.
During this operation, do not allow
anyone to stand under the load.
• Handling
The generously-sized lifting eyes are for
handling the alternator only. They must not
be used to lift the genset. The choice of
liftinghooksorhandlesshouldbedetermined
by the shape of the lifting eyes. Choose a
lifting system which respects the integrity
and the environment of the machine.
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.
There is possible method for restoring the
above minimum values, dry out the machine
for 24 hours in a drying oven at a temper-
ature of 110 °C.
WARNING
Ensure that the alternator has the degree
of protection matching the dened
environmental conditions.
During this operation, do not allow
anyone to stand under the load.
- checking the dimensions of the ywheel
and its housing, the ange, coupling discs
and o󰀨set.
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 coupling
- 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 location where the alternator is placed
must be ventilated to ensure that the
ambient temperature cannot exceed the
data on the nameplate.
• Single-bearing coupling
Before coupling, check the compatibility
between the alternator and the engine by
performing:
- undertaking a torsional analysis of the
transmission (alternators data are available
on request),

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
• Mechanical checks
Before starting the machine for the rst time,
check that:
- top up the cooling circuit with water before
starting the machine,
- all xing screws are tight, and that there are
no leaks on the water inlet and outlet,
- the length of screw and the tightening
torque are correct,
- 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).
WARNING
At the rst start-up or after an extended
shutdown, allow the machine to be
purged: bleeder (69).
3.3 - Terminal connection diagrams
The winding code is specied on the
nameplate.
Any intervention on the alternator
terminals during checks should be
performed with the machine stopped.
In no case should the internal
connections in the terminal box be
subjected to stresses due to cables
connected by the user.
Ph1
Ph2
Ph3
103
104
130 °C
Blue wire
150 °C
Black wire
180 °C
Red/white wire
Thermistor temperature (PTC)
T1
T4
T3
T6 T5
T2
L1(U)
L3(W) L2(V)
D
F
60 Hz50 Hz
380 - 415 380 - 480
6S
60 Hz50 Hz
220 - 240 220 - 240
6S
L1(U)
L3(W)
LL
T1
T4T3
T6
T5 T2
L2(V)
3PH
3PH
W(3) L3
N
V(2) L2
U(1) L1
T3
T5
T2
T1
W(3) L3
V(2) L2
U(1) L1
T4
T5
T2
T3
T1
T6
T4
T6
D350:
1PH: V - W
3PH: U - V - W
D350:
1PH: V - W
3PH: U - V - W
Connection codes
Winding
Winding
Factory connection
NDE
DE
NDE
DE
Star
Delta
Voltage / Detection

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 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 is connected to the
frame.
The connections inside the terminal box
must never be subjected to stress due to
cables connected by the user.
Diameter M6 M8 M10 M12
Torque 4 Nm 10 Nm 20 Nm 35 Nm
Tolerance ± 15%
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 4.3).
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 4.5).
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.
TheAVRisusedtomakeanyadjustments
to the machine.

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 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
appropriatefor mechanicaland 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.
Also check that no liquid is leaking from the
cooling circuit.
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 orany 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.
Check regularly that no liquid is leaking from
the cooling circuit.
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 4.5).
WARNING
WARNING

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
4.3 - Bearings
The bearings are permanently greased Approximate life of the grease (depending on use) =
20,000 hours or 3 years.
4.4 - Cooling circuit
Composition Water, anticorrosion oxygen inhibitor, glycol-type antifreeze up
to 50%
Maintenance - Coolant change interval = 16,000 hours or 2 years maximum
(the rst of two who is reached)
- pH of water = 7<pH<8
4.5 - Mechanical defects
Fault Action
Bearing
Excessive overheating of one
or both bearings
(bearing temperature 80°C
above the ambient
temperature)
- 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)
- 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

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LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
4.6 - 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
Adjust AVR 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)
AREP < 10V
- Check the speed (or AVR LAM set too high)
Voltage between E+ and E-
AREP > 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

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 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
• Checking the diode bridge
A diode in good working order should allow
the current to ow only in the anode-to-
cathode direction.
+R +R
+-
-W
-W
IN
IN
IN
IN
Anode Cathode

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
4.7 - Dismantling, reassembly
During the warranty period, this operation
should only be carried out in an approved
workshop or in our factory, otherwise the
warranty may be invalidated.
Whilst being handled, the machine
should remain horizontal (rotor not
locked when moved). 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: 8 mm, 10 mm, 12 mm
- 1 socket set: 8, 10, 13 mm
- 1 socket TORX bit T20 and T30
- 1 puller (eg. Facom: U35, U32/350)
• Screw tightening torque
See section 5.4.
• Draining the cooling circuit
- Leave the machine stationary for 6 hours
before draining the cooling circuit (operating
temperature 70°C).
- The cooling circuit must be drained using a
uid recovery system.
Toxic risk
The coolant can contain up to 50%
glycol-type antifreeze, which represents
a risk to health.
• Access to connections
Access is directly after removing the air
duct (3).
• Accessing, checking and replacing the
diode bridge
Dismantling
- Remove the air ducts (3).
- Cut the xing clamps of the exciter cables,
disconnect E+, E- from the exciter.
- Disconnect T1 to T6 from the terminal
block (124).
- Remove the nuts on the tie rods (37).
- Remove the NDE bracket (36) using a
puller: eg. U.32 - 350 (Facom).
- Unsolder the connections.
- Check the bridge using an ohmmeter or a
battery lamp.
Reassembly
- Replace the bridges, respecting the
polarity.
- Resolder the connections.
- Fit a new O ring seal in the bracket.
- Ret the NDE bracket.
- Connect T1 to T6 from the terminal block
(124).
- Replace the xing clamps on the cables.
- Replace the air ducts (3).
WARNING
Rotor
NDE bracket
Threaded rod M10

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
• Replacing the NDE bearing on single
bearing machines
Dismantling
- Remove the air ducts (3).
- Remove the NDE bracket (36).
- 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 alternator.
- Place the preloading wavy washer (79) in
the bracket.
- Replace the NDE bracket (36).
- Replace the air ducts (3).
• Replacing the bearings on two-bearing
machine
Dismantling
- Uncouple the alternator from the prime
mover.
- Remove the air ducts (3).
- Remove the assembly screws.
- Remove the DE bracket (30).
- Remove the NDE bracket (36).
- Remove both antifriction 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 alternator.
- Check that both the preloading wavy
washer (79) have been tted on the NDE
bracket (36).
- Ret the DE bracket (30) and tighten the
xing screws.
- Replace the air ducts (3).
- Check that the alternator assembly is
correctly mounted and that all screws are
tightened.
• Accessing the revolving eld coil and
stator
Dismantling
Follow the procedure for dismantling the
bearings.
- Remove the coupling discs (single-bearing
alternator) or the DE bracket (two-bearing
alternator) and insert a tube of the
corresponding diameter on the shaft end or
a support made according the following
bellow.
- Rest the rotor on one of its poles, then slide
it out. Use the tube as a lever arm to assist
dismantling.
- After extracting the rotor, be careful not to
damage the fan and place the revolving eld
on special V-shaped supports.
NOTE: If intervention is required on the
revolving eld coil (rewinding, replace-
mentof components),therotorassembly
must be rebalanced.
Reassembly
- Follow the dismantling procedure in
reverse order.
Take care not to knock the windings when
retting the rotor in the stator.

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
- If you replace the fan, respect the assembly
guide according the following bellow. Use a
tube and a screw.
Follow the procedure for reassembling the
bearings.
4.8 - Table of characteristics
Table of average values:
Alternator - 4 poles - 50 Hz - Standard
winding No. 6S (6-wire)
The voltage and current values are given for
no-load operation and operation at rated
load with separate eld excitation.
All values are given to within ± 10% and may
be changed without prior notication (for
exact values, consult the test report).
• Three-phase: 4 pole AREP excitation
Resistances at 20 °C (Ω)
Type Stator L/N Rotor Exciter
eld
Exciter
armature
VS0 0.232 0.54 6.54 0.169
S0 0.159 0.60 6.54 0.169
M2 0.092 0.71 7.36 0.187
VL6 0.048 0.95 7.36 0.187
Resistances of auxiliary windings at
20 °C (Ω)
Type X1, X2 Z1, Z2
VS0 0.634 0.350
S0 0.410 0.446
M2 0.574 0.463
VL6 0.498 0.408
Field excitation current i exc (A)
400V - 50 Hz
“i exc”: excitation current of the exciter eld
Type No load At rated load
VS0 0.88 1.30
S0 0.90 1.45
M2 0.90 1.40
VL6 0.92 1.46
For 60 Hz machines, the “i exc” values are
approximately 5 to 10 % lower.
• Table of weights
(values given for information only)
Type Total weight (kg) Rotor (kg)
VS0 157 38
S0 178 43
M2 207 53
VL6 290 75.5
After operational testing, it is essential
to replace all access panels or covers.

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
5 - SPARE PARTS
5.1 - First maintenance parts
Emergency repair kits are available as an
option.
They contain the following items:
Emergency kit AREP 5155833
AVR D350 -
Diode bridge assembly -
Single-bearing kit 4774933
Non drive end bearing -
Preloading (wavy) washer -
Double-bearing kit 4774941
Non drive end bearing -
Drive end bearing -
«O» ring -
Preloading (wavy) washer -
5.3 - Accessories
• Temperature sensors with thermistors
(PTC)
Thermistor with a positive temperature
coe󰀩cient installed in the stator winding.
1 or 2 thermistors in the brackets.
These sensors must be linked to adapted
sensing relays (supplied optionally).
Cold resistance of cold thermistor sensors:
100 to 250 Ω per sensor.
5.2 - Technical support service
Our technical support service will be
pleased to provide any additional
information you may require.
For all spare parts orders or technical
support requests, send your request to
[e-mail] or your
nearest contact, whom you will nd 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 identied 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.
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.

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
5.4 - Exploded views, parts list and tightening torque
• Single bearing

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
• Two-bearing

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
5960 en -
Ref. Qty Description Screw
ØTorque N.m Ref. Qty Description Screw ØTorque N.m
1 1 Stator assembly - - 53 1 Sealing cap - -
3 2 Air duct M6 10 60 1Drive end (DE) bearing - -
41Rotor assembly - - 67 1 Circlips - -
54Air duct holder M6 10 68 1Inner bearing retainer M6 8.3
61 Feet - - 70 1Non drive end (NDE)
bearing - -
15 1 Fan M5 4 79 1Preloading (wavy)
washer - -
22 1 Shaft extension key - - 90 1Exciter eld (stator) M6 10
28 1 Earth terminal M6 10 100 1 Exciter armature
(rotor) - -
30 1
Drive end (DE) ange
(single bearing) or
drive end (DE) bracket
(two-bearing)
- - 124 1Terminal block M5 6
33 1 Grille M5 4322 1 Coupling disc M10 66
36 1Non drive end (NDE)
bracket M10 34 343 2Diode bridge M5 4
37 4 Tie rod - - 410 1Drive end (DE) ange M10 40

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Electric Power Generation Installation and maintenance
LSAH 42.3
Low Voltage Alternator - 4 pole
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Disposal and recycling instructions
We are committed to limiting the
environmental impact of our activity. We
continuously monitor our production
processes, material sourcing and product
design to improve recyclability and minimise
our environmental footprint.
These instructions are for information
purposes only. It is the user’s responsibility
to comply with local legislation regarding
product disposal and recycling.
Recyclable materials
Our alternators are mainly constructed from
iron, steel and copper materials, which can
be reclaimed for recycling purposes.
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.
All materials listed above need special
treatment to separate waste from
reclaimable materials and should be
entrusted to specialist recycling companies.
The oil and grease from the lubrication
system should be treated as hazardous
waste and must be treated in accordance
with local legislation.
Our alternators have a specied lifetime of
20 years. After this period, the operation of
the product should be stopped, regardless
of its condition. Any further operation after
this period will be under the sole responsi-
bility of the user.
The coolant, oil and grease from the
lubrication system should be treated as
hazardous waste and must be treated in
accordance with local legislation.