Leroy-Somer LSA 43.2 Instruction Manual

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LSA 43.2/44.2 - 4-POLE
ALTERNATORS
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320
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120
44.2 coupling
Installation and maintenance
3434 en - 06.2007 / g

2
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
3434 en - 06.2007 / g
LEROY-SOMER
This manual concerns the alternator which
you have just purchased.
The latest addition to a whole new generation
of alternators, this range benefits from the
experience of the world’s leading
manufacturer, using advanced technology and
incorporating strict quality control.
SAFETY MEASURES
Before using your machine for the first 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 qualified 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 risk of accident. It is vital that you understand
and take notice of the different warning symbols used.
Warning symbol for an operation capable of damaging or
destroying the machine or surrounding equipment.
Warning symbol for general danger to personnel.
Warning symbol for electrical danger to personnel.
Note: LEROY-SOMER reserves the right to modify the
characteristics of its products at any time in order to
incorporate the latest technological developments. The
information contained in this document may therefore be
changed without notice.
We wish to draw your attention to the contents
of this maintenance manual. By following
certain important points during installation,
use and servicing of your alternator, you can
look forward to many years of trouble-free
operation.
WARNING SYMBOLS
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.
Copyright 2004: MOTEURS LEROY-SOMER
This document is the property of:
MOTEURS LEROY-SOMER
It may not be reproduced in any form without prior
authorization.
All brands and models have been registered and patents
applied for.
CAUTION
CAUTION

3
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
CONTENTS
3434 en - 06.2007 / g
LEROY-SOMER
1 - RECEIPT
1.1 - Standards and safety measures ....................4
1.2 - Inspection.......................................................4
1.3 - Identification...................................................4
1.4 - Storage ..........................................................4
2 - TECHNICAL CHARACTERISTICS
2.1 - Electrical characteristics ................................5
2.2 - Mechanical characteristics.............................5
3 - INSTALLATION - COMMISSIONING
3.1 - Assembly .......................................................6
3.2 - Inspection prior to first use.............................6
3.3 - Terminal connection diagrams.......................7
3.4 - Commissioning ..............................................9
3.5 - Settings..........................................................9
4 - SERVICING - MAINTENANCE
4.1 - Safety measures ......................................... 10
4.2 - Regular maintenance.................................. 10
4.3 - Fault detection ............................................ 10
4.4 - Mechanical defects ..................................... 11
4.5 - Electrical faults............................................ 11
4.6 - Dismantling, reassembly............................. 13
4.7 - Installation and maintenance of the PMG... 14
4.8 - Table of characteristics ............................... 15
5 - SPARE PARTS
5.1 - First maintenance parts .............................. 17
5.2 - Bearing designations .................................. 17
5.3 - Technical support service ........................... 17
5.4 - Exploded view, parts list ............................. 18

4
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
RECEIPT
3434 en - 06.2007 / g
LEROY-SOMER
1 - RECEIPT
1.1 - Standards and safety measures
Our alternators comply with most international standards and
are compatible with:
- the recommendations of the
International Electrotechnical Commission
IEC 34-1, (EN 60034)
- the recommendations of the
International Standards Organisation ISO 8528
- the European Community directive 89/336/EEC on
Electromagnetic Compatibility (EMC)
- the European Community directives
73/23/EEC and 93/68/EEC (Low Voltage Directive)
They are CE marked with regard to the LVD (Low Voltage
Directive) in their role as a machine component. A declaration
of incorporation can be supplied on request.
Before using your generator for the first time, read carefully
the contents of this installation and maintenance manual,
supplied with the machine. All operations performed on the
generator should be undertaken by qualified personnel
trained in the commissioning, servicing and maintenance of
electrical and mechanical components. This maintenance
manual should be retained for the whole of the machine's life
and be handed over with the contractual file.
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 different warning symbols
used.
1.2 - Inspection
On receipt of your alternator, check that it has not suffered
any damage in transit. If there are obvious signs of knocks,
contact the transporter (you may able to claim on their
insurance) and after a visual check, turn the machine by hand
to detect any malfunction.
1.3 - Identification
The alternator is identified by means of a nameplate glued to
the frame.
Make sure that the nameplate on the machine conforms to
your order.
The machine name is defined according to various criteria
(see below).
Example of description: LSA 43.2 M45 J6/4
• LSA: Name used in the PARTNER range
• M: Marine
• C: Cogeneration
• T: Telecommunications
• 43.2: Machine type
• M45: Model
• J: Excitation system (C: AREP/J: SHUNT or PMG/
E: COMPOUND)
• 6/4: Winding number/number of poles
Nameplate
So that you can identify your machine quickly and accurately,
we suggest you fill in its specifications on the nameplate
below.
1.4 - Storage
Prior to commissioning, machines should not be stored in
humid conditions: at relative humidity levels greater than
90%, the machine insulation can drop very rapidly, to just
above zero at around 100%. The state of the anti-rust
protection on unpainted parts should be monitored.
For storage over an extended period, the machine can be
placed in a sealed enclosure (heatshrunk plastic for example)
with dehydrating sachets inside, away from significant and
frequent variations in temperature to avoid the risk of
condensation during storage.
If the area is affected by vibration, try to reduce the effect of
these vibrations by placing the generator on a damper
support (rubber disc or similar) and turn the rotor a fraction of
a turn once a fortnight to avoid marking the bearing rings.
ALTERNATEURS ALTERNATORS
Valeurs excit / Excit. values
en charge / full load
à vide / at no load
Made by Leroy Somer - 1 024 930/b
Tension
Voltage
Secours
Std by
40C
27C
PUISSANCE / RATING
Conforme à C.E.I 34-1(1994). According to I.E.C 34-1(1994).
LR 0021
Connex.
kVA
kW
A
kVA
kW
A
V
Ph.
Continue
Continuous
LSA Date
N Hz
Min
-1
/R.P.M. Protection
Cos Ø /P.F. Cl. ther. / Th. class
Régulateur/A.V.R.
Altit. m Masse / Weight
Rlt AV/D.E bearing
Rlt AR/N.D.E bearing
Graisse / Grease

5
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
TECHNICAL CHARACTERISTICS
3434 en - 06.2007 / g
LEROY-SOMER
2 - TECHNICAL
CHARACTERISTICS
2.1 - Electrical characteristics
PARTNER LSA 43.2/44.2 alternators are machines without
sliprings or revolving field brushes, wound as "2/3 pitch",
12-wire; the insulation is class H and the field excitation
system is available in either "SHUNT", "AREP" or "PMG"
versions (see AVR manual).
2.1.1 - Options
- Stator temperature detection probes
- Space heaters
Interference suppression conforms to standard EN 55011,
group 1, class B. (Europe).
2.1.2 - SHUNT system with R 250 AVR
Other version R 251 AVR for dedicated single-phase or R 448 for additional function
2.1.3 - AREP system with R 438 AVR
2.1.4 - PMG system with R 438 AVR
T1 T2 T3
T4 T5 T6
T7 T8 T9
T10 T11 T12
R 250
5 + 6 –
Varistor
STATOR : 12 wires (marked T1 to T12)
Exciter
Field
Armature
MAIN FIELD
Power supply and voltage reference
SERIES connection
T1 T2 T3
T4 T5 T6
Varistor
5 + 6 –
T7 T8 T9
T10 T11 T12
R 438
Auxiliary windings
Green
Yellow
Red
Black
STATOR : 12 wires (marked T1 to T12)
Exciter
Field
Armature
MAIN FIELD
Voltage reference
PARALLEL
connection
T1 T2 T3
T4 T5 T6
Varistor
5 + 6 –
T7 T8 T9
T10 T11 T12
R 438
PMG
STATOR : 12 wires (marked T1 to T12)
Exciter
Field
Armature
MAIN FIELD
PARALLEL
connection
Voltage reference
2.2 - Mechanical characteristics
- Steel frame
- Cast iron end shields
- Protected ball bearings, greased for life
- Mounting arrangements:
IM 1201 (MD 35) foot and flange mounted, single-bearing
with SAE coupling disc.
IM 1001 (B 34) double-bearing with SAE flange and standard
cylindrical shaft extension.
- Drip-proof machine, self-cooled
- Degree of protection: IP 23
2.2.1 - Mechanical options
- Air inlet filter
- Regreasable ball bearings
- IP 44 protection

6
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
INSTALLATION
3434 en - 06.2007 / g
LEROY-SOMER
3 - INSTALLATION
3.1 - Assembly
All mechanical handling operations must be undertaken
using approved equipment.
Whilst being handled, the machine should remain
horizontal.
3.1.1 - Handling
The generously-sized lifting rings are for handling the
alternator alone. They must not be used to lift the genset.
Choose a lifting system which respects the positioning of the
rings.
3.1.2 - Coupling
3.1.2.1 - Single-bearing alternator
Before coupling the two machines, check that both are
compatible by:
- undertaking a torsional analysis of the transmission on both
units
- checking the dimensions of the flywheel and its housing, the
flange, coupling discs and offset
When coupling the alternator to the prime mover, the
holes of the coupling discs should be aligned with the
flywheel holes by cranking the engine.
Do not use the alternator fan to turn the rotor.
Tighten the coupling disc screws to the recommended torque
(see section 4.6.2) and check that there is lateral play on the
crankshaft.
3.1.2.2 - Two-bearing alternator
- Semi-flexible coupling
Careful alignment of the machines is recommended,
checking that the concentricity and parallelism of both parts of
the coupling does not exceed 0.1 mm.
This alternator has been balanced with a half-key.
3.1.3 - Location
Ensure that the ambient temperature in the room where the
alternator is placed cannot exceed 40 °C for standard power
ratings (for temperatures > 40 °C, apply a derating
coefficient). Fresh air, free from damp and dust, must be able
to circulate freely around the air intake grilles on the opposite
side from the coupling. It is essential to prevent not only the
recycling of hot air from the machine or engine, but also
exhaust fumes.
3.2 - Inspection prior to first
use
3.2.1 - Electrical checks
Under no circumstances should an alternator, new or
otherwise, be operated if the insulation is less than
1 megohm for the stator and 100,000 ohms for the other
windings.
There are three possible methods for restoring the above
minimum values.
a) Dry out the machine for 24 hours in a drying oven at a
temperature of approximately 110 °C (without the AVR).
b) Blow hot air into the air inlet, having made sure that the
machine is rotating with the exciter field disconnected.
c) Run in short-circuit mode (disconnect the AVR):
- Short-circuit the three output terminals (power) using
connections capable of supporting the rated current (try not to
exceed 6 A/ mm
2
)
- Insert a clamp ammeter to monitor the current passing
through the short-circuit connections
- Connect a 48 Volt battery in series with a rheostat of
approximately 10 ohms (50 W) to the exciter field terminals,
respecting the polarity
- Open all the alternator openings fully
- Run the alternator at its rated speed, and adjust the exciter
field current using the rheostat to obtain the rated output
current in the short-circuit connections
Note: Prolonged standstill: In order to avoid these problems,
we recommend the use of space heaters, as well as turning
over the machine from time to time. Space heaters are only
really effective if they are working continuously while the
machine is stopped.
CAUTION
CAUTION
CAUTION
CAUTION

7
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
INSTALLATION
3434 en - 06.2007 / g
LEROY-SOMER
3.2.2 - Mechanical checks
Before starting the machine for the first time, check that:
- the fixing bolts on the feet are tight
- the cooling air is drawn in freely
- the protective grilles and housing are correctly in place
- the standard direction of rotation is clockwise as seen from
the shaft end (phase rotation in order 1-2-3). For anti-
clockwise rotation, swap 2 and 3.
- the winding connection corresponds to the site operating
voltage (see section 3.3)
3.3 - Terminal connection diagrams
To modify the connection, change the position of the terminal
cables. The winding code is specified on the nameplate.
Any intervention on the alternator terminals during
reconnection or checks should be performed with the
machine stopped.
Connection codes L.L voltage Factory connection
L1(U)
N
L3(W)
T1 T7
T12 T10
T4
T9
T3
T6 T11
T5
T2
T8 L2(V)
A
3 phases
3 phases
Winding 60 Hz50 Hz
190 - 208 190 - 240
220 - 230 -
- 190 - 208
6
7
8
N
T1
T7
T12 T10
T4
T9
T3 T6
T11 T5
T2
T8
L1(U)
L3(W) L2(V)
D
FL1(U)
M
L3(W)
T1
T7
T12
T10
T4
T9
T3
T6
T11 T5 T2
T8 L2(V)
LM voltage = 1/2 LL voltage
R 250 voltage sensing:
0 => (T8) / 110 V => (T11)
R 438 voltage sensing:
0 => (T3) / 220 V => (T2)
N
L1(U)
L2(V)
L3(W)
AR
T9
T8
T7
T12
T10
T11
T4
T3
T2
T1
T5 T6
Winding 60 Hz50 Hz
380 - 415 380 - 480
440 - 460 -
- 380 - 416
6
7
8
R 250 voltage sensing:
0 => (T8) / 110 V => (T11)
R 438 voltage sensing:
0 => (T3) / 380 V => (T2)
AR
N
L1(U)
L2(V)
L3(W)
L1(U)
L2(V)
L3(W)
T9
T8
T7
T12
T10
T11
T4
T3
T2
T1
T5
T6
1 phase
1 phase
ou
3 phases
FF
FF
Winding 60 Hz50 Hz
220 - 240 220 - 240
220 - 240
200
250 - 260 -
6
7
8
R 250 voltage sensing:
0 => (T1) / 110 V => (T4)
R 438 voltage sensing:
0 => (T10) / 220 V => (T1)
AR
M
L
L
L
T9
T8
T7
T12
T10
T11 T4
T3
T2
T1
T5
T6
Winding 60 Hz50 Hz
220 - 240 220 - 240
220 - 240
200
250 - 260 -
6
7
8
AR
T9
T8
T7 T12
T10
T11
T4
T3
T2
T1
T5
T6
L
LL
T1 T7
T12
T10
T4
T9
T3
T6
T11
T5
T2 T8
L
M
LM voltage = 1/2 LL voltage
R 250 voltage sensing:
0 => (T8) / 110 V => (T11)
R 438 voltage sensing:
0 => (T3) / 220 V => (T2)

9
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
INSTALLATION
3434 en - 06.2007 / g
LEROY-SOMER
3.3.2 - Option connection diagram
3.3.3 - Connection checks
Electrical installations must comply with the current
legislation in force in the country of use.
Check that:
- The residual circuit-breaker complies with 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 blue wire of the R 791 interference suppression module
linking the neutral)
- Any protective devices in place have not tripped
- If there is an external AVR, the connections between the
alternator and the cubicle are made in accordance with the
connection diagram
- There is no short-circuit between phase or phase-neutral
between the alternator output terminals and the generator set
control cabinet (part of the circuit not protected by circuit-
breakers or cubicle relays)
- The machine has been connected with the busbar
separating the terminals as shown in the terminal connection
diagram
3.4 - Commissioning
The machine can only be started up and used if the
installation is in accordance with the regulations and
instructions defined in this manual.
The machine is tested and set at the factory. When first used
with no load, make sure that the drive speed is correct and
stable (see the nameplate). 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: see
section 3.5). If the machine still operates incorrectly, the
cause of the malfunction must be located (see section 4.4).
3.5 - Setting up
The various adjustments during tests must be made by a
qualified engineer. Take care 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.
R 791 T interference suppression kit (standard for CE marking)
Voltage potentiometer
Black
Black
Black
Blue
White
Connections A D F B F/F G
T1 T1 T1 T1 T1 T2
T2 T2 T2 T2 T9 T4
T3 T3 T3 T3 T3 T3
N N
Voltage adjustment
by remote potentiometer
ST4
Thermistor (PTC) temperature
LSA 43.2, 44.2
Ph1
Ph2
Ph3
Anti condensation heater
101
102
103
104
130 C
blue
150C
black
180 C
red/white

10
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
SERVICING / MAINTENANCE
3434 en - 06.2007 / g
LEROY-SOMER
4 - SERVICING / MAINTENANCE
4.1 - Safety measures
Servicing or troubleshooting must be carried out strictly
in accordance with instructions so as to avoid the risk of
accidents and to maintain the 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.
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.
4.2 - Regular maintenance
4.2.1 - Checks after start-up
After approximately 20 hours of operation, check that all fixing
screws on the machine are still tight, plus the general state of
the machine and the various electrical connections in the
installation.
4.2.2 - Cooling circuit
It is advisable to check that circulation of air is not reduced by
partial blocking of the air intake and outlet grilles: mud, fibre,
grease, etc.
4.2.3 - Bearings
The bearings are permanently greased: approximate life of
the grease (depending on use) = 20,000 hours or 3 years.
Monitor the temperature rise in the bearings, which must not
exceed 60 °C above the ambient temperature. Should this
value be exceeded, the machine must be stopped and checks
carried out.
4.2.4 - Electrical servicing
Cleaning product for the windings
Do not use: trichlorethylene, perchlorethylene,
trichloroethane or any alkaline products.
Certain strictly defined pure volatile degreasing agents can be
used, such as:
- Normal petrol (without additives); inflammable
- Toluene (slightly toxic); inflammable
- Benzene (or benzine, toxic); inflammable
- Ciclohexare (non toxic); inflammable
Cleaning of the stator, rotor, exciter and diode bridge
The insulating components and the impregnation system are
not at risk of damage from solvents (see the list of authorized
products).
Avoid letting the cleaning product run into the slots. Apply the
product with a brush, sponging frequently to avoid
accumulation in the housing. Dry the winding with a dry cloth.
Let any traces evaporate before reassembling the machine.
4.2.5 - Mechanical servicing
Cleaning the machine using a water spray or a
high-pressure washer is strictly prohibited.
Any problems arising from such treatment are not
covered by our warranty.
The machine should be cleaned with a degreasing agent,
applied using a brush. Check that the degreasing agent will
not affect the paint.
Compressed air should used to remove any dust.
If filters have been added to the machine after manufacture
and do not have thermal protection, the service personnel
should clean the air filters periodically and systematically, as
often as necessary (every day in very dusty atmospheres).
Cleaning can be performed using water for dry dust or in a
bath containing soap or detergent in the case of greasy dust.
Petrol or chloroethylene can also be used.
After cleaning the alternator, it is essential to check the
winding insulation (see sections 3.2 and 4.8).
4.3 - Fault detection
If, when commissioned, the alternator does not work
normally, the source of the malfunction must be identified.
To do this, check that:
- the protective devices are fitted correctly
- the connections comply with the diagrams in the manuals
supplied with the machine
- the speed of the unit is correct (see section 1.3)
Repeat the operations defined in section 3
CAUTION
CAUTION
CAUTION
CAUTION

11
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
SERVICING / MAINTENANCE
3434 en - 06.2007 / g
LEROY-SOMER
4.4- Mechanical defects
4.5 - Electrical faults
Fault Action
Bearing
Excessive overheating of one or both
bearings (temperature > 80 °C on the
bearing retainers with or without abnormal
noise)
- If the bearing has turned blue or if the grease has turned black, change the
bearing.
- Bearing not properly seated.
- End shields misaligned (flanges not properly fitted).
Temperature
abnormal
Excessive overheating of alternator frame
(more than 40 °C above the ambient
temperature)
- Air flow (intake-outlet) partially clogged or hot air is being recycled from
the alternator or engine
- Alternator operating at too high a voltage (> 105% of Un on load)
- Alternator overloaded
Vibration
Excessive vibration
- Misalignment (coupling)
- Defective mounting or play in coupling
- Rotor balancing fault
Excessive vibration and humming noise
coming from the machine
- Alternator operating in single-phase mode (single-phase load or faulty contactor
or installation fault)
- Stator short-circuit
Abnormal noise
Alternator damaged by a significant impact,
followed by humming and vibration
- System short-circuit
- Mis-paralleling
Possible consequences
- Broken or damaged coupling
- Broken or bent shaft end
- Shifting and short-circuit of main field
- Fan fractured or coming loose on shaft
- Irreparable damage to rotating diodes or AVR
Fault Action Effect Check/Cause
No
voltage
at no load
on start-up
Connect between E- and
E+ a new battery of 4 to
12 volts, respecting
the AVR polarities, for
2 to 3 seconds
The alternator builds up and its voltage is
still correct when the battery is removed.
- Lack of residual magnetism
The alternator builds up but its voltage
does not reach the rated value when
the battery is removed.
- Check the connection of the voltage reference to the
AVR
- Faulty diodes
- Armature short-circuit
The alternator builds up but its voltage
disappears when the battery is
removed
- Faulty AVR
- Field windings disconnected
- Main field winding open circuit. Check the resistance
Voltage too low Check the drive speed
Correct speed
Check the AVR connections (AVR may be faulty)
- Field windings short-circuited
- Rotating diodes burnt out
- Main 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
If no effect: try normal/rapid recovery
modes (ST2)
- Check the speed: possibility of cyclic irregularity
- Loose connections
- Faulty AVR
- Speed too low when on load (or LAM set too high)
Voltage correct
at no load and
too low when on
load (*)
Run at no load and check
the voltage between E+
and E- on the AVR
Voltage between E+ and E-
SHUNT < 20 V - AREP/PMG < 10 V - Check the speed (or LAM set too high)
Voltage between E+ and E-
SHUNT > 30 V - AREP/PMG > 15 V
- Faulty rotating diodes
- Short-circuit in the main field. Check the resistance
- Faulty exciter armature
(*) Caution: For single-phase operation, check that the sensing wires coming from the AVR are correctly connected to the operating terminals
Voltage
disappears
during operation
(**)
Check the AVR, the surge
suppressor, the rotating
diodes, and replace any
defective components
The voltage does not return to the rated
value
- Exciter winding open circuit
- Faulty exciter armature
- Faulty AVR
- Main field open circuit or short-circuited
(**) Caution: Internal protection may be activated (overload, open circuit, short-circuit)

12
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
SERVICING / MAINTENANCE
3434 en - 06.2007 / g
LEROY-SOMER
4.5.1 - Checking the winding
You can check the winding insulation by performing a high
voltage test. In this case, you must disconnect all AVR wires.
Damage caused to the AVR in such conditions is not
covered by our warranty.
4.5.2 - Checking the diode bridge
4.5.3 - Checking the windings and rotating
diodes using separate excitation
During this procedure, make sure that the alternator is
disconnected from any external load and inspect the
terminal box to check that the connections are fully
tightened.
1) Stop the unit, disconnect and isolate the AVR wires.
2) There are two ways of creating an assembly with separate
excitation.
Assembly A: Connect a 12 V battery in series with a rheostat
of approximately 50 ohms - 300 W and a diode on both exciter
field wires (5+) and (6-).
Assembly B: Connect a "Variac" variable power supply and
a diode bridge on both exciter field wires (5+) and (6-).
Both these systems should have characteristics which are
compatible with the field excitation power of the machine (see
the nameplate).
3) Run the unit at its rated speed.
4) Gradually increase the exciter field supply current by
adjusting the rheostat or the Variac and measure the output
voltages on L1 - L2 - L3, checking the excitation voltage at no
load and at full load (see 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).
CAUTION
CAUTION
LSA 43.2 / 44.2 Diode bridge
- -
C C C
A A A
+
C C C
A A A +
~ ~ ~ ~ ~ ~
C
A
Anode Cathode
A diode in good working condition allows the
current to flow in only one direction, from anode
to cathode.
6 – 5 +
Diode 1 A
12 V battery
Rh. 50 Ω - 300 W
-+
ASSEMBLY A
Exciter field
Diode 1 A
-
+
6 – 5 +
Variac
AC
220 V
DC
12 V
50
60
70
80
90
100
40
30
20
10
0
ASSEMBLY B
Exciter field

13
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
SERVICING / MAINTENANCE
3434 en - 06.2007 / g
LEROY-SOMER
4.6 - Dismantling, reassembly (see sections
5.5.1/5.5.2)
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 when moved).
4.6.1 - Tools required
To fully dismantle the machine, we recommend using the
tools listed below:
- 1 ratchet spanner + extension
- 1 torque wrench
- 1 set of flat spanners: 7 mm, 8 mm, 10 mm, 12 mm
- 1 socket set: 8 mm, 10 mm, 13 mm, 16 mm, 18 mm, 21 mm,
22 mm, 24 mm
- 1 size 5 Allen key (eg. Facom: ET5)
- 1 size 6 Allen key (eg. Facom: ET6)
- 1 size 10 Allen key (eg. Facom: ET10)
- 1 size 14 Allen key (eg. Facom: ET14)
- 1 T20 and T30 TORX bit
- 1 puller (eg. Facom: U35)
- 1 puller (eg. Facom: U32/350).
4.6.2 - Screw tightening torque
4.6.3 - Access to connections and the
regulation system
The terminals are accessed directly by removing the terminal
box lid [48].
To access the AVR adjustment potentiometers, the side plate
[367] should be removed.
4.6.4 - Accessing, checking and
replacing diodes
4.6.4.1 - Dismantling
- Remove the air intake grille [51]
- Remove the surge suppressor [347]
- Disconnect the 6 diodes using an ohmmeter or a battery
lamp (see section 4.5.2)
4.6.4.2 - Reassembly
- Replace the bridges, respecting the polarity (see section
4.5.1)
- Replace the surge suppressor [347]
- Refit the air intake grille [51]
- Replace the terminal box lid [48]
4.6.5 - Replacing the NDE bearing on single-
bearing machines
4.6.5.1 - Dismantling
- Remove the terminal box lid [48]
- Remove the air intake grille [51]
- Unscrew the fixing clamps on the power output cables,
remove the connector from the exciter and the R 791 module.
- Remove the 4 nuts on the tie rods
- Remove the NDE shield [36] using a puller: eg. U.32 - 350
(FACOM)
- Remove the ball bearing [70] using a screw puller
4.6.5.2 - 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 fit it to the
machine.
- Place the preloading wavy washer [79] in the shield and fit a
new O ring seal [349].
Refit the NDE shield and pass the bundle of wires between
the top bars of the shield.
- Refit the fixing clamps on the cables, the R 791 module and
the exciter connector.
IDENTIFICATION screw Ø Torque N.m
Field terminal block screw M4 4 N.m
Field screw M6 10 N.m
Diode bridge/RP M6 5 N.m
Diode nut M5 4 N.m
43.2 tie rod M12 57 Nm
44.2 tie rod M14 90 Nm
Earth screw M8 26 Nm
43.2 disc/shaft screw M12 110 Nm
44.2 disc/shaft screw M16 250 Nm
44.2 turbine screw M6 5 Nm
Grille screws M6 5 Nm
Cover screws M6 5 Nm
Terminal block nut M10 20 Nm

14
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
SERVICING / MAINTENANCE
3434 en - 06.2007 / g
LEROY-SOMER
- Refit the air intake grille [51].
- Replace the terminal box lid [48].
4.6.6 - Replacing the bearings on two-bearing
machines
4.6.6.1 - Dismantling
- Uncouple the alternator from the prime mover.
- Remove the 8 assembly screws.
- Remove the DE shield [30].
- Remove the NDE shield (see section 4.6.5.1)
- Remove both ball bearings [60] and [70] using a puller with
a central screw.
4.6.6.2 - Reassembly
- Heat the new bearings by induction or in a drying oven at
80 °C (do not use an oil-bath) and fit them to the machine.
- 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 4 fixing screws.
- Check that the machine assembly is correctly mounted and
that all screws are tightened.
4.6.7 - Accessing the main field and stator
4.6.7.1 - Dismantling
Follow the procedure for dismantling the bearings (see
sections 4.6.5.1 and 4.6.6.1)
- Remove the coupling disc (single-bearing machine) or the
DE end shield (two-bearing machine) and insert a tube of the
corresponding diameter on the shaft end or a support made
according to the following diagram.
- Rest the rotor on one of its poles, then slide it out. Use the
tube as a lever arm to assist dismantling.
- After extraction of the rotor, be careful not to damage the
fan. If the fan is dismantled, it is essential that it is replaced for
the 43.2.
NOTE: If intervention is required on the main field
(rewinding, replacement of components), the rotor
assembly must be rebalanced.
4.6.7.2 - Reassembling the main field
- Follow the dismantling procedure in reverse order.
Take care not to knock the windings when refitting the rotor in
the stator.
- If the fan is being replaced on the 43.2, assemble the parts
as shown in the following diagram. Fit a tube and a threaded
screw. On the 44.2 the fan is fixed by screws on the hub.
Follow the procedure for reassembling the bearings (see
sections 4.6.5.2 and 4.6.6.2).
After operational testing, replace all access panels or
covers.
4.7 - Installation and maintenance
of the PMG
For the LSA 43.2 and LSA 44.2, the PMG reference is PMG 1.
4.7.1 - Mechanical characteristics
The components are:
- An adaptation shaft (to position the rotor on the shaft
extension)
- A tie rod and nut for assembling the rotor on the shaft
- A rotor with 16 magnets
- An assembly consisting of: housing + wound stator + plastic
connection sheath + plastic ferrules
- The housing closure cover (4 CBLXS M5 screws)
- 4 HM6 screws (for fixing the housing to the NDE shield)
Rotor
NDE shield
Screw rod

15
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
SERVICING / MAINTENANCE
3434 en - 06.2007 / g
LEROY-SOMER
If mounting in kit form, follow the following instructions
(see section 5.4):
1 - Remove the PMG cover [297] and the alternator NDE
shield seal.
2 - Mount the PMG housing assembly [290] on the shield
using the 4 HM6 screws.
3 - Put a coating of anti-vibration adhesive on the tie rod [295]
and fix it on the alternator shaft extension.
4 - Mount the magnetized rotor on the adaptation shaft, then
using 2 threaded rods screwed into the rotor, slide the
assembly onto the tie rod.
5 - Install the cable gland washer [296].
6 - Tighten the assembly with the M10 nut.
7 - Close the PMG with the cover [297].
8 - Pierce the cover (Ø 21 hole) and insert the plastic sheath
and its ferrule.
9 - Connect the PMG to the AVR (see sections 2.5 and 4.7.2).
4.7.2 - Electrical connection
Mounting the PMG-1 on a SHUNT machine
(when using an R438):
- Disconnect the connection wires from the R 250 and remove
the AVR.
- Take out both the R 250 voltage reference wires, marked 2
and 3, by removing them from the terminals (T8 and T11) in
which they are inserted.
- Use these same wires for voltage sensing on the R 438 by
inserting them in terminals T2 (wire 2) and T3 (wire 3).
- Fit the AVR support plate fitted with the R 438 (2 HM6
screws tightened to 10 Nm).
- Connect the 3 PMG wires (14/15/16), the 2 exciter field wires
(5/6) and the 2 previously mentioned voltage sensing wires
(2/3) according to the connection diagram no. 2725-02-98.
- Modify the connection by replacing the single jumper on the
connector located on the terminal box rear panel with 2
jumpers (see internal connection diagram).
Mounting the PMG-1 on an AREP machine
- Connect the 3 PMG wires (14/15/16), to terminals X1, X2,
Z2 on the AVR. The 4 auxiliary winding wires X1.X2.Z1.Z2
should be isolated using the domino fitting supplied with the
kit. Both exciter field wires (5/6) and the voltage sensing wires
(2/3) remain in place.
Electrical characteristics of the PMG
Stator phase/phase resistance 20 °C: 0.7 Ω
No-load voltage : 73 V
4.8 - Electrical characteristics
Table of average values:
Alternator - 2 and 4 poles - 50 Hz/60 Hz - Winding n° 6 and M
or M1 connected in dedicated single-phase. (400 V for the
excitation values).
The voltage and current values are given for no-load
operation and operation at rated load with separate field
excitation. All values are given at ± 10% (for exact values,
consult the test report) and are subject to change without prior
warning. For 60 Hz machines, the resistance values are the
same and the excitation current "i exc" is approximately 5 to
10% weaker.
4.8.1 - 3-phase LSA 43.2 4 P, SHUNT excitation
Resistances at 20 °C (Ω)
Field excitation current i exc (A) - 400 V - 50 Hz
"i exc": excitation current of the exciter field
4.8.2 - 3-phase LSA 43.2 4 P, AREP excitation
Resistances at 20 °C (Ω)
Field excitation current i exc (A) -400 V -50 Hz
"i exc": excitation current of the exciter field
LSA 43.2 Stator L/N Rotor Field Armature
S1 0,155 1,35 18,4 0,23
S15 0,155 1,35 18,4 0,23
S25 0,155 1,35 18,4 0,23
S35 0,128 1,41 18,4 0,23
M45 0,105 1,57 18,4 0,23
L65 0,083 1,76 18,4 0,23
L8 0,063 1,96 18,4 0,23
LSA 43.2 no load on load
S1 0,5 1,3
S15 0,5 1,5
S25 0,5 1,6
S35 0,5 1,8
M45 0,4 1,6
L65 0,4 1,6
L8 0,4 1,6
LSA 43.2 Stator
L/N Rotor Wind. X1,X2 Widing. Z1,Z2 Field Armat.
S1 0,155 1,35 0,32 0,52 4,6 0,23
S15 0,155 1,35 0,32 0,52 4,6 0,23
S25 0,155 1,35 0,32 0,52 4,6 0,23
S35 0,128 1,41 0,29 0,5 4,6 0,23
M45 0,105 1,57 0,26 0,51 4,6 0,23
L65 0,083 1,76 0,26 0,44 4,6 0,23
L8 0,063 1,96 0,21 0,4 4,6 0,23
LSA 43.2 no load on load
S1 12,6
S15 13
S25 13,2
S35 13,6
M45 0,8 3,2
L65 0,8 3,2
L8 0,8 3,2

16
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
SERVICING / MAINTENANCE
3434 en - 06.2007 / g
LEROY-SOMER
4.8.3 - Dedicated single-phase LSA 43.2:
4-pole, SHUNT excitation (60 Hz only)
Resistances at 20 °C (Ω)
Field excitation current i exc (A) -240 V -60 Hz
"i exc": excitation current of the exciter field
4.8.4 - 3-phase LSA 44.2: 4-pole, SHUNT
excitation
Resistances at 20 °C (Ω)
Field excitation current i exc (A) - 400 V - 50 Hz
"i exc": excitation current of the exciter field
4.8.5 - 3-phase LSA 44.2: 4-pole, AREP
excitation
Resistances at 20 °C (Ω)
Field excitation current i exc (A) -400 V -50 Hz
"i exc": excitation current of the exciter field
4.8.6 - Dedicated single-phase LSA 44.2:
4-pole, SHUNT excitation (60 Hz only)
Resistances at 20 °C (Ω)
Field excitation current i exc (A) -240 V -60 Hz
"i exc": excitation current of the exciter field
LSA 43.2 Stator L/N Rotor Field Armature
S1 0,058 1,35 13,9 0,23
S25 0,058 1,35 13,9 0,23
S35 0,046 1,41 13,9 0,23
M45 0,037 1,57 13,9 0,23
L65 0,027 1,76 13,9 0,23
L8 0,019 1,96 13,9 0,23
LSA 43.2 no load on load
S1 0,59 1,44
S25 0,59 1,68
S35 0,66 1,65
M45 0,61 1,48
L65 0,62 1,48
L8 0,74 1,46
LSA 44.2 Stator L/N Rotor Field Armature
VS3 0,046 2,51 18,4 0,5
VS45 0,046 2,51 18,4 0,5
S7 0,036 2,91 18,4 0,5
S75 0,036 2,91 18,4 0,5
M95 0,024 3,32 18,4 0,5
L12 0,019 3,66 18,4 0,5
LSA 44.2 no load on load
VS3 0,5 1,8
VS45 0,5 2,1
S7 0,5 1,9
S75 0,5 2,1
M95 0,6 2
L12 0,6 1,9
LSA 44.2 Stator
L/N Rotor Wind. X1,X2 Wind. Z1,Z2 Field Armat.
VS3 0,046 2,51 0,3 0,5 4,9 0,5
VS45 0,046 2,51 0,3 0,5 4,9 0,5
S7 0,036 2,91 0,21 0,32 4,9 0,5
S75 0,036 2,91 0,21 0,32 4,9 0,5
M95 0,024 3,32 0,17 0,28 4,9 0,5
L12 0,019 3,66 0,16 0,21 4,9 0,5
LSA 44.2 no load on load
VS3 13,6
VS45 14,2
S7 13,8
S75 14,2
M95 1,2 4
L12 13,8
LSA 44.2 Stator L/N Rotor Field Armature
VS3 0,0194 2,51 18,4 0,5
VS45 0,0194 2,51 18,4 0,5
S7 0,0140 2,91 18,4 0,5
M95 0,0088 3,32 18,4 0,5
LSA 44.2 no load on load
VS3 0,44 1,18
VS45 0,44 1,25
S7 0,43 1,2
M95 0,55 1,28

17
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
SPARE PARTS
3434 en - 06.2007 / g
LEROY-SOMER
5 - SPARE PARTS
5.1 - First maintenance parts
Emergency repair kits are available as an option.
They contain the following items:
5.2 - Bearing designations
5.3 - Technical support service
Our technical support service will be pleased to provide any
additional information you may require.
When ordering spare parts, you should indicate the
complete machine type, its serial number and the
information given on the nameplate.
Address your enquiry to your usual contact.
Part numbers should be identified from the exploded
views and their description from the parts list.
Our extensive network of service centres can dispatch
the necessary parts without delay.
To ensure correct operation and the safety of our
machines, we recommend the use of original
manufacturer spare parts.
In the event of failure to comply with this advice, the
manufacturer cannot be held responsible for any
damage.
Ref. Designation Qty LSA 43.2 Code LSA 44.2 Code
60 Bearing on shaft extension end 1 6312 2RS/C3 RLT060TS030 6315 2RS/C3 RLT075TS030
70 Bearing on exciter end 1 6307 2RS/C3 RLT080RB002 6309 2RS/C3 RLT100RB005
CAUTION
CAUTION
Ref. Designation Qty LSA 43.2/44.2 - SHUNT Code
198 AVR 1 R 250 AEM 110 RE 019
R 251 AEM 110 RE 021
343 Diode bridge assembly 1 LSA 432 9 03/04 ESC 040 MD 003
347 Surge suppressor 1 LSA 432 1 13 CII 111 PM 002
AVR fuse 1 250 V - 8 A/slow-blow
Ref. Designation Qty LSA 43.2/44.2 - AREP 4 P Code
198 AVR 1 R 438 AEM 110 RE 003
343 Diode bridge assembly 1 LSA 432 9 03/04 ESC 040 MD 003
347 Surge suppressor 1 LSA 432 1 13 CII 111 PM 002
AVR fuse 2 250 V - 8 A/fast-blow

18
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
SPARE PARTS
3434 en - 06.2007 / g
LEROY-SOMER
5.4 - Exploded views, parts list
5.4.1 - Single-bearing LSA 43.2/44.2
PMG option
343
349
347
70
79 90
36
51
48 59
1
124
41
47
198
100
107
91
37
4
16 15
15
30
33
322
324
325
325
320
323
320
49
28
290 291 292 293 294 295 296 297
207
120
217
44.2 coupling
N° Nbr Description N° Nbr Description
1 1 Stator assembly 120 1
Terminal block support (AREP)
4 1 Rotor assembly 124 1 Terminal block
15 1 Fan 198 1 Voltage regulator (AVR)
16 6 Fixing screws (44.2 only) 207 1 AVR damper seal
28 1 Earth terminal 217 1 Terminal block
30 1 DE shield 290 1 PMG housing
33 1 Air outlet grille 291 1 Adaptation shaft
36 1 Shield on exciter end 292 1 Magnetic rotor
37 4 Tie rod 293 1 Stator
41 1 Cover front panel 294 2 Fixing screws
47 1 Cover rear panel 295 1 Tie rod
48 1 Cover top panel 296 1 Cable gland washer + nut
49 34 Fixing screws 297 1 End plate
51 1 Air intake grille 320 1 Hub (43.2 L7 & 44.2 only)
59 3 Inspection door 322 1 Coupling disc
70 1 NDE bearing 323 - Fixing screws
79 1 Preloading wavy washer 324 1 Clamping washer (43.2 S1 to L6)
90 1 Exciter field 325 - Spacer shim (43.2 L7 & 44.2 only)
91 4 Exciter field fixing screw 343 1 Diode bridge assembly
100 1 Exciter armature 347 1 Surge suppressor
107 1 Diode crescent support 349 1 "O" ring

19
INSTALLATION AND MAINTENANCE
LSA 43.2/44.2 - 4-POLE
ALTERNATORS
SPARE PARTS
3434 en - 06.2007 / g
LEROY-SOMER
5.4.2 - Two-bearing LSA 43.2/44.2
343
349
347
70 79 90
36
51
59
1
124
41
48
49
47
320
100
107
91
28
37
4
15 30 33
16 15
68
62
290 291 292 293 294 295 296 297
217
410
60 68 63
67
198
207
120
PMG option
N° Nbr Description N° Nbr Description
1 1 Stator assembly 91 4 Exciter field fixing screw
4 1 Rotor assembly 100 1 Exciter armature
15 1 Fan 107 1 Diode crescent support
16 6 Fixing screws (44.2 only) 120 1 Terminal block support (AREP)
28 1 Earth terminal 124 1 Terminal block
30 1 DE shield 198 1 Voltage regulator (AVR)
33 1 Air outlet grille 207 1 AVR damper seal
36 1 Shield on exciter end 217 1 Terminal block
37 4 Tie rod 290 1 PMG housing
41 1 Cover front panel 291 1 Adaptation shaft
47 1 Cover rear panel 292 1 Magnetic rotor
48 1 Cover top panel 293 1 Stator
49 34 Fixing screws 294 2 Fixing screws
51 1 Air intake grille 295 1 Tie rod
59 3 Inspection door 296 1 Cable gland washer + nut
60 1 DE bearing 297 1 End plate
62 2/4 Bearing retainer fixing screw 320 1 Hub (44.2 only)
63 1 Cable gland washer (43.2 only) 343 1 Diode bridge assembly
67 1 Circlips 347 1 Surge suppressor
68 1 Inner bearing retainer 349 1 "O" ring
70 1 NDE bearing 410 1 End shield
79 1 Preloading wavy washer
90 1 Exciter field

MOTEURS LEROY-SOMER 16015 ANGOULÊME CEDEX - FRANCE
RCS ANGOULÊME N° B 671 820 223
S.A. au capital de 62 779 000 €
http://www.leroy-somer.com