Leroy-Somer LSA 42.3 Instruction Manual

..; ;oy Scooter
4803 en-2011.12/b
LSA 42.3 - 4 POLES
ALTERNATOKS
Installation and maintenanc

LEROY-SOMER | Installation and maintenance 4803 en-2011.12/b
LSA 42.3 - 4 POLES
ALTERNATORS
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 mac ine for t e first time,
it is important to read t e w ole of t is
installation and maintenance manual.
All necessary operations and interventions
on t is mac ine must be performed by a
qualified tec nician.
Ourtec nical support Service will be pleased
to provide any additional information you
may require.
T e various operations described in t is
manual are accompanied by recommenda-
tions or symbols to alert t e user to t e
potential risk of accidents. It is vital t at you
understand and take notice of t e different
warning symbols used.
(w a r n in g )
Warning symbol for an operation capable
of damaging or destroying the machine
or surróunding equipment.
A
Warning symbol for general danger to
personnel. &
Warning symbol for electrical danger to
personnel.
WARNING SYMBOLS
We wis to draw your attention to t e
following 2 safety measures w ic must be
complied wit :
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.
Asetof self-ad esive stickers depicting t e
various warning symbols is included wit
t is maintenance manual. T ey s ould be
positioned as s own in t e drawing below
once t e mac ine as 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 t e rig t to
modify t e c aracteristics of its producís at
any time in order to incorpórate t e latest
tec nological developments. T e informa
tion contained in t is document may
t erefore be c anged wit out notice.
Copyrig t 2005 : MOTEURS LEROY-
SOMER
T is document is t e property of:
MOTEURS LEROY SOMER.
It may not be reproduced in any form wit out
prior aut orization.
All brands and models ave been registered
and patents applied for.
2Leroy-Some*

LEROY-SOMER [ Installation and maintenance | ________ 4803 en-2011.12/ b
LSA 42.3 - 4 POLES
ALTERNATORS
CONTENTS
1 - RECEIPT ............................................................................................................................ 4
1.1- Standards and safety measures ................................................................................ ...4
1.2 - Inspection ....................................................................................................... 4
1.3 - Identification ................................................................ ....4
1.4-Storag e .......................................................................................... 4
1.5-Application s .................................................................................................................. 4
1.6 - Contraindications to use ............................................................................................... 4
2 -TECHNICAL CHARACTERISTICS .................................................................................... 5
2.1 - Electrical c aracteristics ............................................................................................... 5
2.2 - Mec anical c aracteristics ........................................................................................... 5
3 - INSTALLATION .................................................................................................................. 6
3.1 -Assembly ...................................................................................................................... 6
3.2 - C ecks prior to first 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 - Fault detection .................. ......................................................................................... 11
4.4 - Mec anical defects .................................................................................................... 12
4.5 - Electrical faults ........................................................................................................... 12
4.6 - Dismantling, reassembly ............................................................................................ 14
4.7 - Installation & maintenance of t e PMG... .................................................................... 16
4.8 - Table of c aracteristics ............................................................................................... 16
5 - SPARE PARTS ............................................................................................ 18
5.1 - First maintenance parts .............................................................................................. 18
5.2 - Tec nical support Service ........................................................................................... 18
5.3 - Exploded views, parts list and tig tening torque ......................................................... 19
EC declaration of incorporation ......................................................................................... 22

LEROY-SOMER | Installation and maintenance 4803 en-2011.12/b
LSA 42.3 - 4 POLES
ALTERNATORS
1 - RECEIPT
1.1 - Standards and safety
measures
Our alternators comply wit most
international standards.
See t e EC Declaration of Incorporaron on
t elastpage.
1.2-Inspection
On receipt of your alternator, c eck t at it
as not suffered any damage ¡n transit. If
t ere are obvious signs of knocks, contact
t e transporter (you may be able to claim
on t eir ¡nsurance) and after a visual
c eck, turn t e mac ine by and to detect
any malfunction.
1.3-Identification
T e alternator is ¡dentified by means of a
nameplate fixed on t e mac ine (see
drawing).
Make sure t at t e nameplate on t e
mac ine conforms to your order.
T e mac ine ñame is defined according to
various criteria, for example :
LSA42.3S4 J6/4
• LSA: ñame used in t e PARTNER range
M : Marine
C : Cogeneration
•42.3: mac ine type
• S4: model
• J: excitation system (C: AREP/J: SHUNT)
• 6/4 : winding number / number of poles.
1.3.1 - Nameplate
So t at you can identify your mac ine
quickly and accurately, we suggest you
write its specifications on t e nameplate
below.
1.4-Storage
Prior to commissioning, mac ines s ould
be stored:
- away from umidity (< 90%); after a long
period of storage, c eck t e mac ine
insulation (section 3.2.1). To prevent t e
bearings from becoming marked, do not
store in an environment wit significant
vibration.
1.5 - Application
T ese alternators are mainly designed to
produce electricity in t e context of
applications involving t e use of
generators.
1.6 - Contraindications to use
Use of t e mac ine is restricted to operating
conditions (environment, speed, voltage,
power, etc) compatible wit t e c aracteri
stics indicated on t e nameplate.

LEROY-SOMER Installation and maintenance 4803 e n -2011.12/b
LSA 42.3-4 POLES
ALTERNATORS
2 - TECHNICAL CHARACTERISTICS
1.1 - Electrical characteristics
T e PARTNER LSA 42.3 alternator is
generator wit out sliprings and revolving
field brus es, wound as “2/3 pitc ”; 12-wire,
wit class H insulation and a field excitation
system available in eit er “SHUNT” or
“AREP” or“PMG” versión.
In order to conform to standard EN 61000-
6.3, EN 61000-6.2, t e R 791 interference
suppression kit is needed.
2.1.1 - Electrical options
- Stator temperature detection probes.
- Space eaters.
2.2 - Mechanical characteristics
- Steel frame
- End s ields in cast iron
- Greasable ball bearings
- Mounting arrangement
MD 35:
single bearing wit standard feet and SAE
flanges/coupling discs.
B 34:
two-bearing wit SAE flange and standard
cylindrical s aft extensión.
- Drip-proof mac ine, self-cooled
2.1.1 - Mechanical options
- Protection against ars environments .
-Air input filter, air output labyrint cowling.
Alternators fitted wit air inlet filters s ould
be derated by 5% (power).
To prevent excessive temperature rise
caused by clogged filters, it is advisable to fit
t e stator winding wit t ermal sensors
(PTC).
STATOR: 12 wires (T1 to T12 identification)
T12
T12
STATOR: 6 or 12 wires (T1 to T 12 identification)
rre
T12
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LEROY-SOMER Installation and maintenance 4803 en -2011.12/ b
LSA 42.3-4 POLES
ALTERNATORS
3 - INSTALLATION
Personnel undertaking the various
operations indicated in this section must
wear personal protective equipment
appropriate for mechanical and electri
cal hazards.
3.1 -Assembly
A
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.
3.1.1 - Handling
T e generously-sized lifting rings are for
andling t e alternator alone. T ey must not
be used to lift t e genset. T e c oice of
lifting ooksor andless ouldbedetermined
by t e s ape of t ese rings. C oose a lifting
system w ic respects t e integrity and t e
environment of t e mac ine.
(w a r n in g )
After handling the machine using the
lifting ring, snap on the plástic cover
provided in the maintenance manual
wallet.
3.1.2 -Coupling
3.1.2.1 - Single-bearing alternator
Before coupling t e mac ines, c eck t at
t ey are compatible by:
- undertaking a torsional analysis of t e
transmission,
- c ecking t e dimensions of t e flyw eel
and its ousing, t e flange, coupling discs
and offset.
(w a r n in g )
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 flywheel holes by
cranking the engine.
Make sure the machine is securely
bedded in position during coupling.
C eck t at t ere is lateral play on t e
cranks aft.
3.1.2.2 - Double-bearing alternator
- Semi-flexible coupling
Careful alignment oí t e mac ines is
recommended, c ecking t at t e lack of
concentricity and parallelism of bot parts
of t e coupling do not exceed 0.1 mm.
This alternator has been balanced with a
1/2 key.
3.1.3 -Location
T e room w ere t e alternator is placed
must be ventilated to ensure t at t e
ambient temperature cannot exceed t e
data on t e nameplate.
Lerov-Somer

LEROY-SOMER | Installation and maintenance | 4803 e n -2011.12/b
LSA 42.3 -4 POLES
ALTERNATORS
3.2 - Checks prior to first use
3.2.1 - Electrical checks
A
Under no circumstances should an
alternator, neworotherwise, beoperated
if the insulation is less than 1 megohm
for the stator and 100,000 ohms for the
other windings.
T ere are 2 possible met ods for restoring
t e above minimum valúes.
a) Dry out t e mac ine for 24 ours in a
drying oven at a temperature of 110 °C
(wit out t e regulator).
b) Blow ot air into t e air intake, aving
made sure t at t e mac ine is rotating wit
t e exciter field disconnected.
Note: Prolonged standstill: In orderto avoid
t ese problems, we recommend t e use of
space eaters, as well as turning over t e
mac ine from time to time. Space eaters
are only really effective if t ey are working
continuously w ile t e mac ine is stopped.
(w a r n in g )
Ensure that the alternator has the
degree of protection matching the
defined environmental conditions.
3.2.2 - Mechanical checks
Before starting t e mac ine for t e first time,
c eck t at:
- all fixing bolts and screws are tig t,
- t e cooling air is drawn in freely,
- t e protective grilles and ousing are cor-
rectly in place,
- t e standard direction of rotation is clock-
wise as seen from t e s aft end (p ase
rotation in order 1-2-3).
For anti-clockwise rotation, swap 2 and 3.
- t e winding connection corresponds to t e
site operating voltage (see section 3.3).
3.3 - Terminal connection diagrams
To modify t e connection, c ange t e
position of t e stator cables on t e termináis.
T e winding code is specified on t e
nameplate.
A
Any intervention on the alternator
termináis during reconnection or checks
should be performed with the machine
stopped.
Under no circumstances must the
terminal box internal connections be
subjected to any stress due to the cables
connected by the user.
us»roy~Somer 7

LEROY-SOMER | Installation and maintenance | 4803 en-2011.12/b
LSA 42.3 - 4 POLES
ALTERNATORS
Connection code L.L voltage Factory connection
Winding
6
8
50 Hz
190-208
220 - 230
60 Hz
190-240
190-208
L3(W) T3 L2(V)
R 220 voltage sensing:
0 => (T8) / 110 V=> (T11)
R 438 voltage sensing:
0 => (T3) / 220 V => (T2)
-►N
• L3(W)
‘ L2(V)
-► L1(U)
NDE
L1(U) Winding 50 Hz 60 Hz
6380-415 380 - 480
-N 7440 - 460 -
8-380-416
R 220 voltage sensing:
0 => (T8) / 110 V => (T11)
R 438 voltage sensing:
0 => (T3) / 380 V => (T2)
T11
T12
T10
T9
T6
T8
T5
3> ■N
L3(W)
-> * L2(V)
‘ L1(U)
NDE
Winding
6
8
50 Hz
220 - 240
250 - 260
200
60 Hz
220 - 240
220 - 240
Tensión LM = 1/2 tensión LL
LM voltage = 1/2 LL voltage
R 220 voltage sensing:
0 => (T1) / 110 V => (T4)
R 438 voltage sensing:
0 => (T8) / 220 V => (T11) NDE
Winding
6
8
50 Hz
220 - 240
250 - 260
200
60 Hz
220 - 240
220 - 240
Tensión LM = 1/2 tensión LL
LM voltage = 1/2 LL voltage
R 220 voltage sensing:
0 =>(T8) / 110 V => (T11)
R 438 voltage sensing:
0 => (T3) / 220 V => (T2)
; eroy-Some«

LEROY-SOMER Installation and maintenance 4803 en-2011.12/b
LSA 42.3 -4 POLES
ALTERNATORS
Connection code L.L voitage Factory connection
L1 (V) Winding
1 phase
Or T12
3 phases
6
8
50 Hz
110-120
120-130
60 Hz
120
T11-S T5 - y
13 S
110-120
R 220 voltage sensing:
0 => (T8) / 110 V => (T11)
R 438 voltage sensing:
0 =>(T3) / 110 V => (T2)
T9 —HQ
T10
T8
Ti2ÍN_ T2
O
■ L3(W)
* L2(V)
' L1(U)
NDE
Connection inadvisable Winding
6
8
50 Hz
220 - 240
250 - 260
200
60 Hz
220 - 240
220 - 240
T11
LM voltage = 1/2 LL voltage
R 220 voltage sensing:
0 =>(T8) / 110 V => (T11)
R 438 voltage sensing:
0 => (T3) / 220 V => (T2) NDE
4-WIRE SINGLE-PHASE - type M or M1 DEDICATED WINDING
T1
SERIAL
CONNECTION
T2 T3
M
T4
50/60 Hz voltage Output
L -L L -M Connect L L M
220 110
230 115 T 2 -T 3 T1 T4 T 2 -T 3
240 120
^ R 220 voltage sensing: 0 => (T1) / 110 V => (T2)
PARALLEL
CONNECTION
50/60 Hz voltage Output
L -L L -M Connect L L M
110
115 _T1 -T3 T1-T3 T 2 -T 4 _
120 -T 2-T 4
R 220 voltage sensing: 0 = > (T1) / 110 V => (T2)
3.3.1 - Option connection diagram
^ R 791 ¡nterference suppression kit Voltage potentiometer
Connections
Black #- T1
Black • - T 2
Black • - T 3
Blue • - N
White ^
©
T1
T2
T3
N
©
T1
T2
T3
T1
T2
T3
T1
T9
T3
©
T2
T4
T3 ST4
Voltage adjustment
via remóte potentiometer
Space heater PTC stator sensors
1U1
102
130C
blue wire
150C
black wire
180C
red/white wire
Lerov-Som«=r

LEROY-SOMER Installation and maintenance 4803 en-2011.12/b
LSA 42.3 - 4 POLES
ALTERNATORS
3.3.2- Connection checks
á s
Electrical installations must comply with
the current legislation in forc in the
country of use.
C eck t at:
- T e residual circuit-breaker conforms to
legislation on protection of personnel, in
forcé in t e country of use, and as been
correctly installed on t e alternator power
output as cióse as possible to t e alternator.
(In t is case, disconnect t e wire of t e
interference suppression module linking t e
neutral).
- Any protection devices in place ave not
been tripped.
- If t ere is an external AVR, t e connections
between t e alternator and t e cabinet are
made in accordance wit t e connection
diagram.
- T ere is no s ort-circuit p ase-p ase or
p ase-neutral between t e alternator output
termináis and t e generator set control
cabinet (part of t e Circuit not protected by
circuitbreakers or relays in t e cabinet).
- T e mac ine s ould be connected wit t e
busbar separating t e termináis as s own in
t e terminal connection diagram.
- T e alternator eart terminal inside t e
terminal box is connected to t e electrical
eart Circuit
- T e alternator eart terminal on t e stator
mounting foot is connected to t e frame.
3.4 - Commissioning
A
The machine can only be started up and
used if the installation is in accordance
with the regulations and instructions
defined in this manual.
T e mac ine is tested and set up at t e
factory. W en first used wit no load, make
sure t at t e drive speed is correct and
stable (see t e nameplate).
On application of t e load, t e mac ine
s ould ac ieve its rated speed and voltage;
owever, in t e eventof abnormal operation,
t e mac ine setting can be altered (follow
t e adjustment procedure in section 3.5). If
t e mac ine still operates incorrectly, t e
cause of t e malfunction must be located
(see section 4.4).
3.5 - Setting up
A
The various adjustments during tests
must be made by a qualified engineer.
Ensure that the drive speed specified on
the nameplate is reached before
commencing adjustment.
After operational testing, replace all
access panels or covers.
The AVR is used to make any adjustments
to the machine.
ctti

LEROY-SOMER Installation and maintenance 4803 en -2011A2I b
LSA 42.3 - 4 POLES
ALTERNATORS
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.
ás
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 t e mac ine,
ensure t at it cannot be started by a manual
or automatic system and t at you ave
understood t e operating principies of t e
system.
A
Warning : During and after running, the
alternator will reach temperatures hot
enough to cause injury, such as burns.
4.2 - Routine maintenance
4.2.1 - Checks after start-up
After approximately 20 ours of operation,
c eck t at all fixing screws on t e mac ine
are still tig t, plus t e general state of t e
mac ine and t e various electrical
connections in t e installation.
4.2.2 - Bearings
T e bearings are greased for life:
approximate life of t e grease (depending
on use) = 20,000 ours or 3 years. Monitor
t e temperature rise in t e bearings, w ic
s ould not exceed 90°C above t e ambient
tem perature. S ould t is valué be exceeded,
t e alternator must be stopped and c ecks
carried out.
4.2.3 - Electrical servicing
Commercially-available volatile degreasing
agents can be used.
(w a r n in g )
Do not use: trichtorethylene, perchlo-
rethylene, trichloroethane or any alkaline
products. ás
These operations must be performed ata
cleaning station, equipped with a
vacuum system that collects and flushes
out the products used.
T e insulating components and t e
impregnation system are not at risk of
damage from solvents. Avoid letting t e
cleaning product run into t e slots.
Apply t e product wit a brus , sponging
frequently to avoid accumulation in t e
ousing. Dry t e winding wit a dryclot . Let
any traces evapórate before reassembling
t e mac ine.
4.2.4 - Mechanical servicing
(w a r n in g )
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 brus and detergent
(suitable for paintwork).
Dusting: Use an airgun.
If t e mac ine is fitted wit air inlet and outlet
filters, t e maintenance personnel s ould
clean t em routinely at regular intervals. In
t e case of dry dust, t e filter can be cleaned
using compressed air and/or replaced if it is
clogged.
After cleaning t e alternator, it is essentiai tó-
c eck t e winding insulation (see sections
3.2 and 4.8).
4.3 - Fault detection
If, w en commissioned, t e alternator does
not work normally, t e source of t e
malfunction must be identified (see sections
4.4 and 4.5).
L e ro y -S o m e « 11

LEROY-SOMER Installation and maintenance 4803 en-2011.12/b
LSA 42.3-4 POLES
ALTERNATORS
4.4 - Mechanical defects
Fault Action
Bearing
Excessive overheating of one or both bearings
(bearing temperature 80°C above the ambient
temperature) (With or without abnormal bearing
noise)
- If the bearing has turned blue or if the grease has turned black, change the bearing.
- Bearing not fully locked (abnormal play in the bearing cage)
- End shields incorrectly aligned
Abnormal
temperature
Excessive overheating of alternator frame
(more than 40° C above the ambient
temperature)
- Air flow (inlet-outlet) partially clogged or hot air is being recycled from the alternator or
engine
- Alternator operating at too high a voltage (> 105% of Un on load)
- Alternator overloaded
Vibrations
Too much vibration - Misalignment (coupling)
- Defective mounting or play in coupling
- Rotor balancing fault (Engine - Alternator)
Excessive vibration and humming noise
coming from the machine - Phase imbalance
- Stator short-circuit
Abnormal
noise Alternator damaged by a significant impact,
followed by humming and vibration
- System short-circuit
- Misparalleling
Possible consequences
- Broken or damaged coupling
- Broken or bent shaft end
- Shifting and short-circuit of main field
- Fan fractured or coming loose on shaft
- Irreparable damage to rotating diodes/AVR, surge suppressor
4.5 - 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 termináis
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 valu when
the battery is removed.
- Check the connection of the voltage reference to the AVR
- Faulty diode
- Armature short-circuit
The alternator builds up but its
voltage disappears when the battery
is removed.
- Faulty AVR
- Field windings open Circuit (check winding)
- Main field winding open Circuit (check the resistance)
Voltage too
low Check the drive speed Correct speed
Check the AVR connections (possible AVR failure)
- Field windings short-circuited
- Rotating diodes burnt out
- Main field winding short-circuited - Check the resistance
Speed too low Increase the drive speed (do not touch the AVR voltage pot. (P2)
before running at the correct speed)
Voltage too
high Adjust AVR voltage potentiometer Adjustment ineffective Faulty AVR
Voltage
oscillations Adjust AVR stability
potentiometer
- Check the speed : possibility of cyclic irregularity
- Loose connections
- Faulty AVR
- Speed too low when on load (or LAM set too high)
Voltage
correct
at no load
and too low
when on load
0
Run at no load and check
the voltage between E+
et E- on the AVR
Voltage between E+ and E-
AREP < 6V - Udc < 10V - Check the speed
Voltage between E+ and E-
SHUNT < 10V - Udc < 15V
- Faulty rotating diodes
- Short-circuit in the main field. Check the resistance.
- Faulty exciter armature. Check the resistance.
(*) Warning : During single-phase operation, check that the sensing wires from the AVR are connected to the correct output termináis.
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 valu .
- Exciter winding open Circuit
- Faulty exciter armature
- Faulty AVR
- Main field open Circuit or short-circuited
(**) Warning: The AVR internal protection may cut in (overload lost connection, short Circuit).
4 O Lemv-Somer

LEROY-SOMER Installation and maintenance 4803 en-2011.12/ b
LSA 42.3 - 4 POLES
ALTER NATORS
4.5.1 - C ecking t e winding series wit a r eostat of approximately
You can c eck t e winding insulation by
performing a ig voltage test. In t is case,
you must disconnect all AVR wires.
(w a rn in g )
Damage caused to the AVR in such
conditions is not covered by our
warranty.
4.5.2 - Checking the diode bridge
A diode in good working order s ould allow
t e current to flow only in t e anode-to-
cat ode direction.
4.5.3 - Checking the windings and
rotating diodes using separate
excitation A
During this procedure, make sure that
the aiternator is disconnected from any
external load and inspect the terminal
box to check that the connections are
fully tightened.
1) Stop t e unit, disconnect and isolate t e
AVR wires.
2) T ere are two ways of creating an
assembly wit separate excitation.
Assembly A: Connect a 12 V battery in
50 o ms - 300 W and a diode on bot exciter
field wires (5+) and (6-).
ASSEMBLY A
12V battery
Assembly B: Connect a “Variac” variable
power supply and a diode bridge on bot
exciter field wires (5+) and (6-).
Bot t ese systems s ould ave
c aracteristics w ic are compatible wit
t e field excitation power of t e mac ine
(see t e nameplate).
3) Run t e unit at its rated speed.
4) Gradually increase t e exciter field
current by adjusting t e r eostat or t e
variac and measure t e output voltages on
L1 - L2 - L3, c ecking t e excitation voltage
and current at no load (see t e mac ine
nameplate or ask for t e factory test report).
W en t e output voltage is at its rated valué
and balanced wit in 1% for t e rated
excitation level, t e mac ine is in good
working order. T e fault t erefore comes
from t e AVR or its associated wiring (ie.
sensing, auxiliary windings).
ASSEMBLY B Exciter field
Variac
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LEROY-SOMER Installation and maintenance 4803 en-2011.12/b
LSA 42.3 - 4 POLES
ALTERNATORS
4.6 - Dismantling, reassembly
(see sections 5.4.1. & 5.4.2.)
(w a r n in g )
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
alternator weighs (see section 4.7)
before choosing the lifting method.
4.6.1 - Tools required
To fully dismantle t e mac ine, we
recommend using t e tools listed below:
-1 ratc et spanner + extensión
-1 torque wrenc
-1 setofflatspanners:8mm, 10 mm, 12mm
-1 socket set: 8,10,13 mm
-1 socket TORX bitT20, T30
-1 puller (eg. Facom: U35, U32/350)
4.6.2 -Screw tightening torque
See section 5.4. A
The screws for fixing the feet on the
housing and immobilising the stator
must not be removed (bolt of the stator
lower).
4.6.3 - Access to connections and the
regulation system
T e termináis and AVR are accessed
directly by removing t e terminal box lid
(41).
AVR is accessed directly by removing t e
terminal box lid
4.6.4 - Accessing, checking and
replacing the diode bridge
4.6.4.1 - Dismantling
- Remove t e terminal box lid [41].
- Cut t e fixing clamps of t e exciter cables,
disconnect E+, E- from t e exciter.
- Remove t e 4 nuts on t e tie rods.
- Remove t e NDE s ield [36] using a puller:
eg. U.32 - 350 (Facom).
- Unsolder t e connections.
- C eck t e bridge using an o mmeter or a
battery lamp (see section 4.5.2).
4.6.4.2 - Reassembly
- Replace t e bridges, respecting t e
polarity (see section 4.5.1).
- Resolder t e connections.
- Fit a new O ring seal in t e s ield.
- Refit t e NDE s ield and pass t e bundle
of wires between t e top bars of t e s ield.
- Replace t e fixing clamps on t e cables.
- Replace t e terminal box lid [48].
Rotor
NDE s ield
M10 t readed rod

LEROY-SOMER Installation and maintenance 4803 en-2011.12/b
LSA 42.3 - 4 POLES
ALTERNATORS
4.6.5 - Replacing the NDE bearing on
single-bearing machines
4.6.5.1 - Dismantling
- Remove t e NDE s ield [36] (see section
4.6.4.1).
- Remove t e ball bearing [70] using a screw
puller.
4.6.5.2 - Reassembly
- Heat t e ¡nner slipring of a new bearing by
induction or in a drying oven at 80 °C (do not
use an oil bat ) and fit it to t e alternator.
- Place t e preloading wavy was er [79] in
t e flange and fit a new O ring seal [349].
- Replace t e NDE bracket [36] (see section
4.6.4.2).
4.6.6 - Replacing the bearings on a
two-bearing alternator
4.6.6.1 - Dismantling
- Uncouple t e alternator from t e prime
mover.
- Remove t e 4 assembly screws.
- Remove t e DE flange [30].
- Remove t e NDE bracket (see section
4.6.4.1).
- Remove bot bearings [60] and [70] using
a puller.
4.6.6.2 - Reassembly
- Fit new bearings after eating t em by
induction or in a drying oven at 80 °C (do not
use an oil bat ).
- C eck t at bot t e preloading wavy
was er [79] and new O ring seal ave been
fitted [349] on t e NDE bracket [36].
- Replace t e DE flange [30], and tig ten t e
4 fixing screws.
- C eck t at t e w ole alternator is correctly
assembled and t at all screws are fully
tig tened.
4.6.7 - Accessing the main field and
stator
4.6.7.1 - Dismantling
Follow t e procedure for dismantling
bearings (see sections 4.6.6.)
- Remove t e coupling discs (single-bearing
alternator) or t e DE flange (two-bearing
alternator) and insert a tube of t e
corresponding diameter on t e s aft end or
a support made according t e following
bellow.
- Rest t e rotor on one of its poles, t en slide
it out. Use t e tube as a lever arm to assist
dismantling.
-After extraction, be careful wit t e fan. It is
necessary to replace t e fan in case of
disassembling.
- After extracting t e rotor, be careful not to
damage t e fan and place t e revolving field
on special V-blocks.
NOTE: If intervention is required on the
main field (rewinding, replacement of
components), the rotor assembly must
be rebalanced.
4.6.7.2 - Reassembly
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LEROY-SOMER Installation and maintenance 4803 en-2011.12/b
LSA 42.3 -4 POLES
ALTERNATORS
4.8.1 - Three-phase: 4-pole, SHUNT
excitation
Resistances at 20 °C (ü)
LSA 42.3 L/N stator Rotor Field coil Armature
VS1 0.28 0.57 17.6 0.20
VS2 0.26 0.62 17.6 0.20
VS3 0.22 0.67 17.6 0.20
S4 0.16 0.78 17.6 0.20
S5 0.16 0.78 17.6 0.20
M7 0.135 0.85 17.6 0.20
M8 0.115 0.87 17.6 0.20
L9 0.095 0.91 17.6 0.20
- Follow t e dismantling procedure in
reverse order.
Take care not to knock t e windings w en
refitting t e rotor in t e stator.
If you replace t e fan, respect t e assembly
guide according t e following bellow. Use a
tube and a screw.
Follow t e procedure for reassembling t e
bearings (see section 4.6.6).
4.7 - Installation and maintenance of
the PMG
For t e LSA 42.3, t e PMG reference is
PMG 0.
See t e PMG maintenance manual, ref:
4211.
4.8 - Table of characteristics
Table of average valúes:
Alternator - 4 pole - 50 Hz/60 Hz - Winding
no. 6 and M or M1 connected in dedicated
single-p ase (400 V for t e excitation
valúes).
T e voltage and current valúes are given for
no-load operation and operation at rated
load wit separate field excitation. All valúes
are given to +10% (for exact valúes, consult
t e test report) and are subject to c ange
wit out prior warning. For 60 Hz operation,
t e resistance valúes are t e same and t e
excitation current “i exc” is approximately 5
to 10% weaker.
Field excitation current i exc (A)
400V - 50 Hz
“i exc”: excitation current of t e exciter field
LSA 42.3 No load At rated load
VS1 0.55 1.70
VS2 0.55 1.77
VS3 0.55 1.81
S4 0.56 1.67
S5 0.56 1.85
M7 0.56 1.84
M8 0.57 1.87
L9 0.57 1.90
4.8.2 - Three-phase: 4-pole, AREP
excitation
Resistances at 20 °C (Q)
LSA 42.3 L/N stator Rotor Field coil Armature
VS1 0.28 0.57 7.35 0.20
VS2 0.26 0.62 7.35 0.20
VS3 0.22 0.67 7.35 0.20
S4 0.16 0.78 7.35 0.20
S5 0.16 0.78 7.35 0.20
M7 0.135 0.85 7.35 0.20
M8 0.115 0.87 7.35 0.20
L9 0.095 0.91 7.35 0.20
l prov-Somer

LEROY-SOMER | Installation and maintenance 4803 en-2011.12/b
LSA 42.3 -4 POLES
ALTERNATORS
Resistance of auxiliary windings at
20 °C (Q)
LSA 423 X1, X2 auxil. wdgs Z1.Z2 auxil. wdgs
VS1 0.403 0.454
VS2 0.398 0.475
VS3 0.402 0.517
S4 0.335 0.458
S5 0.307 0.458
M7 0.307 0.426
M8 0.319 0.447
L9 0.313 0.433
Field excitation current i exc (A)
230V - 50 Hz
“i exc”: excitation current of t e exciter field
LSA 43.2 No load At rated load
VS1 0.55 1.31
VS2 0.52 1.31
VS3 0.51 1.22
S4 0.48 1.03
S5 0.48 1.16
M7 0.46 1.15
M8 0.50 1.21
L9 0.50 1.29
Field excitation current i exc (A)
400V-50 Hz
“i exc”: excitation current of t e exciter field
LSA 42.3 Noload At rated load
VS1 0.84 2.60
VS2 0.84 2.70
VS3 0.84 2.80
S4 0.86 2.60
S5 0.86 2.85
M7 0.86 2.85
M8 0.87 2.86
L9 0.87 2.90
4.8.3 - Dedicated single-phase M:
4-pole, SHUNT excitation
Resistances at 20 °C (Q)
LSA 42.3 L/N stator Rotor Field coil Armature
VS1 0.145 0.57 17.6 0.20
VS2 0.130 0.62 17.6 0.20
VS3 0.107 0.67 17.6 0.20
S4 0.076 0.78 17.6 0.20
S5 0.076 0.78 17.6 0.20
M7 0.068 0.85 17.6 0.20
M8 0.057 0.87 17.6 0.20
L9 0.047 0.91 17.6 0.20
4.8.4 - Dedicated single-phase M1:
4-pole, SHUNT excitation
Resistances at 20 °C (Q i
LSA 42.3 L/N stator Rotor Field coil Armature
VS1 0.105 0.57 17.6 0.20
VS2 0.095 0.62 17.6 0.20
VS3 0.075 0.67. 17.6 0.20
S4 0.060 , 0.78 17.6 0.20
S5 0.060 0.78 17.6 0.20
M7 0.052 0.85 17.6 0.20
M8 0.043 0.87 17.6 0.20
L9 0.036 0.91 17.6 0.20
4.8.5 - Table of weights
(valúes given for information only)
LSA 42.3 Total weight (kg) Rotor (kg)
VS1 125 47
VS2 130 49
VS3 140 53
S4 165 63
S5 165 63
M7 180 69
M8 185 72
L9 215 75
A
After operational testing, it is essential to
replace all access panels or covers.
Leroy-Somer 17

LEROY-SOMER Installation and maintenance 4803 en-2011.12/b
LSA 42.3 - 4 POLES
ALTERNATORS
5 - SPARE PARTS
5.1 - First maintenance parts
Emergency repair kits are available as an
option.
T ey contain t e following items:
5.2 - Technical support Service
Ourtec nical support service will be pleased
to provide any additional information you
may require.
W en ordering spare parts, you s ould
indícate t e complete mac ine type, its
serial number and t e information given on
t e nameplate.
Address your enquiry to your usual contact.
Part numbers s ould be identified from t e
exploded views and t eir description from
t e parts list.
Our extensive network of service centres
can dispatc t e necessary parts wit out
delay.
To ensure correct operation and t e safety
of our mac ines, we recommend t e use of
original manufacturer spare parts.
In t e event of failure to comply wit t is
advice, t e manufacturer cannot be eld
responsible for any damage.
A
After operational testing, it is essential to
replace all access panels or covers.
Emergency kit SHUNT ALT 423 KS 001
AVR R 220 -
Diode bridge assembly -
Emergency kit AREP ALT 423 KS 002
AVR R 438 -
Diode bridge assembly -
Single-bearing kit ALT 423 KB 001
Non drive end bearing -
«0» ring -
Preloading (wavy)
was er -
Double-bearing kit ALT 423 KB 002
Non drive end bearing -
Drive end bearing -
«0» ring -
Preloading (wavy)
was er -
1RLeroy-Somer"

LEROY-SOMER Installation and maintenance 4803 en-2011.12/b
-LSA 42.3-4 POLES
ALTERNATORS
5.3 - Exploded view, parts list and tightening torque
5.3.1 - Single bearing, AREP or SHUNT
Leroy-Somer 19

y1
LEROY-SOMER | Installation and maintenance 4803 en-2011.12/b
LSA 42.3-4 POLES
ALTERNATORS
5.3.2 - Two-bearing, AREP or SHUNT