Leroy-Somer LSA 47.2 Instruction Manual

This manual is tobegivento
theenduser
LSA 47.2 - 4 POLES
ALTERNATORS
343
100
347
78
34
9
70
1
28
Installation and maintenance
3742 en - 06.2007 / d

2
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
3742 en - 06.2007 / d
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 leading manufacturer
worldwide, 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 the potential risk of accidents. It is vital that you
understand and take notice of the different warning symbols
used.
Warning symbol for an operation capable of
damaging or destroying the machine or
surrounding equipment.
Warning symbol for general danger to personnel.
Warning symbol for electrical danger to personnel.
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 2005: 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.
WARNING
WARNING

3
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
3742 en - 06.2007 / d
LEROY-SOMER
CONTENTS
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
3.1 - Assembly .......................................................6
3.2 - Checks prior to first use .................................6
3.3 - Terminal connection diagrams.......................7
3.4 - Commissioning ..............................................9
4 - SERVICING - MAINTENANCE
4.1 - Safety measures..........................................10
4.2 - Routine 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....15
4.8 - Table of characteristics................................16
5 - SPARE PARTS
5.1 - First maintenance parts .............................. 17
5.2 - Technical support service ........................... 17
5.3 - Accessories................................................. 17
5.4 - Exploded views, parts list............................ 18

4
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
RECEIPT
3742 en - 06.2007 / d
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 with
specialist training in the commissioning, servicing and
maintenance of electrical and mechanical machinery. 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 the potential risk 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 be 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 fixed on
the machine (see drawing).
Make sure that the nameplate on the machine conforms to
your order.
The machine name is defined according to various criteria, for
example: LSA 47.2 M7 C6/4 -
• LSA: name used in the PARTNER range
M: Marine
C: Cogeneration
T: Telecommunications.
• 47.2: machine type
• M7: model
• C: excitation system
(C: AREP/J: SHUNT or PMG/E: COMPOUND)
• 6/4 : winding number / number of poles.
1.3.1 - Nameplate
So that you can identify your machine quickly and accurately,
we suggest you write its specifications on the nameplate
below.
1.4 - Storage
Prior to commissioning, machines should be stored:
- Away from humidity: in conditions of relative humidity of
more than 90%, the machine insulation can drop very rapidly,
to just above zero at around 100%; monitor the state of the
anti-rust protection on unpainted parts. 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
LSA Date
N 5700 125897 A15 Hz
Min
-1
/R.P.M. 1500 Protection
Cos Ø /P.F. 0,8 Cl. ther. / Th.class
Régulateur/A.V.R. R 438 B
Altit. m Masse / Weight
Rlt AV/D.E bearing 6302 2 RS C3
Rlt AR/N.D.E bearing 6303 2 RS C3
Graisse / Grease 45g / 3600 h
Valeurs excit / Excit. values
en charge / full load
à vide / at no load
Made in France - 1 024 959/a
Tension
Voltage
Secours
Std by
40C
(*) Tension maxi. / maximum voltage
27C
PUISSANCE / RATING
Conforme à C.E.I 60034-1. According to I.E.C 60034-1.
166631
Connex.
kVA
kW
A
kVA
kW
A
V
Ph.
Continue
Continuous
USC

5
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
TECHNICAL CHARACTERISTICS
3742 en - 06.2007 / d
LEROY-SOMER
T1 T2 T3
T4 T5 T6
Varistor
5+ 6-
T7 T8 T9
T10 T11 T12
R 250
SHUNT SYSTEM
AREP SYSTEM
PMG SYSTEM
STATOR : 12-wire (marking T1 to T 12)
EXCITER
Field
Armature
EXCITER
Field
Armature
EXCITER
Field
Armature
MAIN FIELD
Power supply / Detection
T1 T2 T3
T4 T5 T6
Varistor
5+ 6-
T7 T8 T9
T10 T11 T12
R 448
Aux. windings
STATOR : 6 or 12-wire (marking T1 to T 12)
MAIN FIELD
Voltage reference
T1 T2 T3
T4 T5 T6
Varistor
5+ 6-
T7 T8 T9
T10 T11 T12
R 448
PMG
STATOR : 6 or 12-wire (marking T1 to T12)
MAIN FIELD
Voltage reference
2 - TECHNICAL CHARACTERISTICS
2.1 - Electrical characteristics
The LSA 47.2 alternator is a machine without sliprings or
revolving armature brushes, wound as “2/3 pitch”, 6 or
12-wire, with class H insulation and a field excitation system
available in either SHUNT, AREP or "PMG" version (see
diagrams). Interference suppression conforms to standard
EN 55011, group 1, class B.
2.1.1 - Electrical options
- Stator temperature detection sensors
- Bearing sensors (PTC, PT100, etc)
- Space heater
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 47.2 - 4 POLES
ALTERNATORS
INSTALLATION
3742 en - 06.2007 / d
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 hoisting system which respects the positioning of
the rings.
3.1.2 - Coupling
3.1.2.1 - single-bearing alternator
Before coupling the machines, check that they are compatible
by:
- undertaking a torsional analysis of the transmission
- checking the dimensions of the flywheel and its housing, the
flange, coupling discs and offset
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.
Check that the “O” ring seal and the preloading (wavy)
washer are present in the NDE bearing seat.
Check that there is lateral play on the crankshaft.
3.1.2.2 - double-bearing alternator
- Semi-flexible 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.
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 - Checks 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 110 °C (without the regulator)
b) Blow hot air into the air intake, 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 power terminals using
connections capable of supporting the rated current (try not to
exceed 6 A/mm2)
- Insert a clamp ammeter to monitor the current passing
through the short-circuit connections.
- Connect a 24 Volt battery in series with a rheostat of
approximately 10 ohms (50 W) to the exciter field terminals,
respecting the polarity.
- Open fully all the alternator openings.
- 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.
3.2.2 - Mechanical checks
Before starting the machine for the first time, check that:
- all fixing bolts and screws 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)
WARNING
WARNING

7
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
INSTALLATION
3742 en - 06.2007 / d
LEROY-SOMER
3.3 - Terminal connection diagrams
To modify the connection, change the position of the stator
cables on the terminals. The winding code is specified on the
nameplate.
3.3.1 - Terminal connection: 12 wire
The connection accessories are detailed in section 5.3.3.
Any intervention on the alternator terminals during
reconnection or checks should be performed with
the machine stopped.
Connection codes Voltage L.L Factory connection
L1(U)
N
L3(W)
T1 T7
T12
T10
T4
T9
T3
T6
T11
T5
T2
T8 L2(V)
A
3-phase
3-phase
Winding 60 Hz50 Hz
190 - 208 190 - 240
220 -
- 190 - 208
6
7
8
6
7
8
9
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)
Voltage LM = 1/2 voltage LL
R 250 voltage sensing:
0 => (T8) / 110 V => (T11)
R 448 voltage sensing:
0 => (T3) / 220 V => (T2)
Winding 60 Hz50 Hz
380 - 415 380 - 480
440
600
-
- 380 - 416
R 250 voltage sensing:
0 => (T8) / 110 V => (T11)
NDE
L1(U)
L2(V)
L3(W)
Single-phase
or
3-phase
Winding 60 Hz50 Hz
220 - 240 220 - 240
220 - 240
240 - 254 -
-
-
LL
R 250 voltage sensing:
0 => (T8) / 110 V => (T11)
T11
T12
T10 T4
T6
T5
T7
T8
T9
T1
T2
T3
N
(*)
In case of reconnection, ensure that AVR voltage sensing is correct!
Winding 9: R 448 voltage sensing + transformer (Diagram on request)
NDE
L1(U)
L2(V)
L3(W)
T11
T12
T10 T4
T6
T5
T7
T8
T9
T1
T2
T3
N
M
AR
L1(U)
L2(V)
L3(W)
T11
T12
T10 T4
T6
T5
T7
T8
T9
T1
T2
T3
Operating phases L2 (V), L3 (W)
single phase
The factory can supply a set of flexible shunts and special connection links as an option for making these connections (*).
R 448 voltage sensing:
0 => (T3) / 380 V => (T2)
R 448 voltage sensing:
0 => (T3) / 220 V => (T2)

8
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
INSTALLATION
3742 en - 06.2007 / d
LEROY-SOMER
3.3.2 - Terminal connection: 6 wire
(not possible with the R 250)
3.3.3 - Option connection diagram
A standard alternator is fitted with 3 starting ranges, 1 neutral
connection link.
Connection codes Voltage L.L Factory connection
3-phase
N
T1
T4
T3
T6
T5
T2
L1(U)
L3(W) L2(V)
D
NDE
L1(U)
L3(W)
T1
T4T3
T6
T5 T2
L2(V)
F
Single-phase
or 3-phase
(*)
Winding 60 Hz50 Hz
380 - 415 380 - 480
440
380 - 416
-
-
-
6S
7S
8S
Winding 60 Hz50 Hz
R 448 voltage sensing:
0 => (T3) / 220 V => (T2)
9S 600
220 - 240
220 - 240
220 - 277
240 - 254 -
-
6S
7S
8S
Winding 9: R 448 voltage sensing + transformer (Diagram on request)
NDE
L1(U)
L2(V)
L3(W)
T4
T6
T5
T1
T2
T3
N
L1(U)
L2(V)
L3(W)
T4
T6
T5
T1
T2
T3
In case of reconnection, ensure that AVR voltage sensing is correct!
The factory can supply a set of flexible shunts and special connection links as an option for making these connections (*).
R 448 voltage sensing:
0 => (T3) / 380 V => (T2)
Operating phases: L2 (V), L3 (W) single phase
R 791 T Interference suppression kit (standard for CE marking) Remote voltage potentiometer
Black
Black
Black
Blue
White
Connections A D F
T1 T1 T1
T2 T2 T2
T3 T3 T3
N N
Voltage adjustment
via remote potentiometer
ST4

9
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
INSTALLATION
3742 en - 06.2007 / d
LEROY-SOMER
3.3.4 - 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 circuit-
breakers or relays in the cabinet).
- The machine should be 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 up at the factory. When first
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 4.2.3).
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 4.4).
3.4.1 - Special type of use
Current transformer connection
Space heater PTC stator temperature sensors
Neutral
link
Neutral
link
6-wire
- PH 1
In/2 (D conn.) - Secondary 1 AIn/2 - Secondary 1 A
D connection
12-wire
P1
P2
T4
T4
D & A connection
P1
P2 T10
T10
Ph1
Ph2
Ph3
101
102
103
104
130 C
blue wire
150C
black wire
180 C
red/white wire
250W - 220 V
WARNING
WARNING

10
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SERVICING - MAINTENANCE
3742 en - 06.2007 / d
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 - Routine 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 regreasable (option). It is advisable to
lubricate the machine during operation. Time intervals and
quantity of grease are given in the table below.
Lubrication intervals are given for grease type
LITHIUM - standard - NLGI 3.
In the factory, the grease used for lubrication is:
SHELL - ALVANIA G3.
Before using another grease, check for compatibility with the
original one. Monitor the temperature rise in the bearings,
which should not exceed 50°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)
- 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 above list of
authorised 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 water or a high-
pressure washer is strictly prohibited.
Any problems arising from such treatment are not
covered by our warranty.
Degreasing: Use a brush and detergent (suitable for
paintwork).
Dusting: Use an air gun.
If 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 is necessary (every day in very dusty atmospheres).
The filter cant be cleaned with air gun in case of dry dust.
The filter must be changed in case of greasy dust.
After cleaning the alternator, it is essential to check the
winding insulation (see sections 3.2 and 4.8).
NDE/DE bearing 6318 C3 6315 C3
Quantity of grease 41 g 30 g
Regreasing interval 3500 hrs 4500 hrs
WARNING
WARNING
WARNING
WARNING

11
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SERVICING - MAINTENANCE
3742 en - 06.2007 / d
LEROY-SOMER
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 protection 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.
4.4 - Mechanical defects
4.5 - Electrical faults
Fault Action
Bearing
Excessive temperature rise in one or both
bearings (bearing temperature more than
80°C) 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).
- Check the end shield alignment (flange not properly fitted).
Abnormal
temperature
Excessive temperature rise in the alternator
housing (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 (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
- Mis-paralleling
Possible consequences:
- Broken or damaged coupling
- Broken or bent shaft extension.
- Shifting and short-circuit of revolving field winding.
- 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 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 field 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 field 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 LAM set too high)
Voltage correct
at no load and
too low when on
load
Run at no load and check
the voltage between E+
and E- on the AVR
Voltage between E+ and E- (DC)
SHUNT/AREP/PMG < 10V - Check the speed (or LAM set too high)
Voltage between E+ and E-
SHUNT/AREP/PMG > 15V
- Faulty rotating diodes
- Short-circuit in the revolving field 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 field coil open circuit or short-circuited

12
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SERVICING - MAINTENANCE
3742 en - 06.2007 / d
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.
After operational testing, replace all access panels
or covers.
4.5.2 - Checking the diode bridge
A diode in good working order should allow the current to flow
only in the anode-to-cathode direction
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 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 and on 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).
WARNING
WARNING
C
A
Anode Cathode
- -
+ +
~ ~ ~
C C C
A A A
C C C
A A A
~ ~ ~
-
C
A
+
-
CA
+
6 - 5 +
Diode 1A
12V battery
Rh. 50Ω-300W
-+
ASSEMBLY A Exciter field
Diode 1A
-
+
6 - 5 +
Variac AC
220V
DC
12V
50
60
70
80
90
100
40
30
20
10
0
ASSEMBLY B
Exciter field

13
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SERVICING - MAINTENANCE
3742 en - 06.2007 / d
LEROY-SOMER
4.6 - Dismantling, reassembly
(see sections 5.4.1 & 5.4.2)
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 in position).
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: 8 mm, 10 mm, 18 mm
- 1 socket set: 8, 10, 13, 16, 18, 21, 24, 30 mm
- 1 socket with male ferrule: 5 mm
- 1 puller
4.6.2 - Screw tightening torque
4.6.3 - Access to diodes
- Open the air intake grille (51).
- Disconnect the diodes.
- Check the 6 diodes using an ohmmeter or a battery lamp
(see section 4.5.2).
If the diodes are faulty,
- Remove the surge suppressor (347).
- Remove the 6 "H" nuts for mounting the diode bridges on the
support.
- Change the crescents, respecting the polarity.
4.6.4 - Access to connections and the
regulation system
Access directly by removing the top of the cover (48) or the
AVR access door (466).
4.6.5 - Replacing the NDE bearing
- Remove the air intake grille (51).
- Remove the lid of the protective cover (48) and the side
panels (366) and (367).
- Remove the hook (21) and the cover rear panel (365).
- Replace the hook (21) in order to manipulate the flange.
- Disconnect the exciter wires (5+,6-).
If using a single-bearing or double-bearing machine with the
regreasable bearing option:
- Remove the bearing thrust screws (78).
- Remove all 5 screws (37).
- Remove the shield (36).
- Take out the antifriction bearing (70) using a puller with a
central screw (see drawing below).
- Fit the new antifriction bearing onto the shaft after heating it
by induction to approximately 80 °C.
- Mount the new preloading (wavy) washer (79) + the new “O”
ring seal (349) in the shield (36).
If using a single-bearing or double-bearing machine with the
regreasable bearing option:
- Screw a threaded rod into the thrust bearing (78).
- Refit the end shield on the machine using a dowel and nut
in the shaft extension (see drawing).
- Slide the threaded rod into the shield hole to make it easier
to assemble (see basic diagram).
- Fit the thrust bearing screws (78), remove the threaded rod,
fit the other screw and tighten up the assembly.
- Tighten the 5 bearing screws (37).
- Reconnect exciter wires E+, E-.
- Finish reassembling the cover.
IDENTIFICATION screw Ø Torque N.m
Field screw M 6 10
Diode nut M 6 4
Flange/frame screw M 12 69
NDE shield/frame screw M 12 69
Disc/Sleeve screw M 16 170
Earth screw M 10 20
Grille screws M 6 5
Cover screws M 6 5
Terminal block nut M 12 35
Earth screw M 12 35
WARNING
WARNING

14
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SERVICING - MAINTENANCE
3742 en - 06.2007 / d
LEROY-SOMER
When dismantling the shields, you will need to
change the antifriction bearings, the “O” ring seal
and the preloading (wavy) washer.
4.6.6 - Replacing the DE bearing
- Remove the air outlet grille (33).
- Remove the 6 screws (31) from the DE shield and the 4
screws (62) from the inner bearing retainer.
- Remove the shield (30).
- Take out the ball bearing (60) using a puller with a central
screw (see section 4.6.5).
- Fit the new bearing, after heating it by induction to
approximately 80 °C.
- Screw a threaded rod into the thrust bearing (68).
- Refit the shield (30) on the machine.
- Slide the threaded rod into the shield hole to make it easier
to assemble (see basic diagram).
- Tighten the bottom thrust bearing screws (68), remove the
threaded rod and fit the other screws.
- Tighten the 6 shield screws (31).
- Refit the air outlet grille (33).
When dismantling the machine, always change the
antifriction bearings.
4.6.7 - Dismantling the rotor assembly
- Remove the NDE shield (36) as described in section 4.6.5.
- Remove the DE shield (30) as described in section 4.6.6 if it
is a double-bearing machine
- Support the DE rotor (4) with a strap or with a support
constructed in accordance with the following drawing.
- Move the strap as the rotor moves in order to distribute the
weight over it.
When dismantling the rotor involves changing
parts or rewinding, the rotor must be rebalanced.
4.6.8 - Reassembling the machine
- Mount the rotor (4) in the stator (1) (see drawing above)
taking care not to knock the windings.
If using a single-bearing or double-bearing machine with the
regreasable bearing option:
- Mount the new preloading (wavy) washer (79) + the new “O”
ring seal (349) in the shield (36).
- Screw a threaded rod into the thrust bearing (78).
- Refit the shield (36) on the machine using a dowel and nut
in the shaft extension (see diagram).
- Slide the threaded rod into the shield hole to make it easier
to assemble (see diagram).
- Fit the thrust bearing screws (78), remove the threaded rod,
fit the other screw and tighten up the assembly.
- Tighten the 5 bearing screws (37).
- Reconnect exciter wires E+, E-.
- Finish reassembling the cover.
- Refit the flange (30) on the stator (1).
- Tighten the screws (31).
If using a double-bearing machine:
- Mount the new preloading (wavy) washer (79) + the new “O”
ring seal (349) in the shield (36).
- Refit the shield (36) on the machine using a dowel and nut
in the shaft extension (see diagram).
- Tighten the 5 shield screws (37).
- Reconnect exciter wires E+, E-.
- Finish reassembling the cover.
- Screw a threaded rod into the thrust bearing (68).
- Refit the shield (30) on the machine.
- Slide the threaded rod into the shield hole to make it easier
to assemble (see basic diagram).
- Fit the thrust bearing screws (68), remove the threaded rod,
fit the other screw and tighten up the assembly.
- Tighten the 6 shield screws (31).
- Refit the air outlet grille (33).
- Check that the machine assembly is correctly mounted and
that all screws are tightened.
Rotor
NDE shield
Dowel
Nut
Threaded rod
4 78 36
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING

15
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SERVICING - MAINTENANCE
3742 en - 06.2007 / d
LEROY-SOMER
4.6.9 - Dismantling and reassembly of the
filters
- Remove the grille (417) then take out the filter (418). Change
the filter if necessary; please refer to section 4.2.5 for
cleaning the filter.
To replace, follow the instructions in reverse order.
4.7 - Installation and maintenance of
the PMG
For the LSA 47.2, the PMG reference is: PMG 2.
4.7.1 - Mechanical characteristics
The components are:
- a shaft adapter (to position the rotor on the alternator shaft).
- an M16 tie rod and nut for assembling the rotor on the shaft.
- a rotor with 16 magnets.
- an assembly of frame+wound stator+plastic connection
sheath+plastic ferrules.
- the housing end plate (4 CBLXS M5 screws).
- 4 HM6 screws (for fixing the housing to the NDE shield).
If mounting in kit form, follow the instructions below.
1 - Remove the PMG cover [297] and the alternator NDE
shield seal (71).
2 - Mount the PMG housing assembly [290] on the shield
using the 4 HM6 screws.
3 - Apply anti-vibration adhesive to the tie rod [295] and
tighten it in the alternator shaft extension tapped hole to a
torque of 30 Nm.
4 - Mount the magnetised rotor on the shaft adapter, then
using 2 M10 threaded rods screwed into the rotor, slide the
assembly onto the tie rod.
5 - Once the rotor is in position, remove the 2 M10 rods.
6 - Install the cable gland washer [296].
7 - Lock the assembly with the M16 nut (torque of 116 Nm).
8 - Close the PMG with the cover [297].
9 - Remove the plastic plug on the NDE panel and fit the
plastic sheath and its ferrule.
10 - Connect the PMG to the AVR (section 4.7.2).
4.7.2 - Electrical connection
- Connect the 3 PMG wires (14/15/16), the 2 exciter wires (5/
6) and the above-mentioned 2 voltage sensing wires (2/3)
according to the connection diagram (see section 2.3.2).
Mounting the PMG 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 according to the current rules and
regulations. Both exciter field wires (5/6) and both voltage
sensing wires (2/3) remain in place.
Electrical characteristics of the PMG 2:
Stator phase/phase resistance 20 °C: 2.1 Ω
No-load A.C. voltage between phases at 1500 rpm: 125 V.
With the PMG, check that the ST9 jumper is open circuit.
After operational testing, replace all access panels
or covers.
418
417
51
WARNING
WARNING

16
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SERVICING - MAINTENANCE
3742 en - 06.2007 / d
LEROY-SOMER
4.8 - Table of characteristics
Table of average values
Alternator - 4 poles - 50 Hz - Standard winding No. 6.
(400V 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 to within ± 10% and may be
changed without prior notification (for exact values, consult
the test report).
4.8.1 - Average values for the LSA 47.2
Resistances at 20 °C (Ω)
Resistance of AREP auxiliary windings at 20 °C (Ω)
Field excitation current i exc (A)
Symbols: “i exc”: excitation current of the exciter field.
For 60 Hz machines, the “i exc” values are approximately 5 to
10% lower.
4.8.2 - Voltage of auxiliary windings at no load
LSA 47.2 L/N stator Rotor Field Armature
VS2 0.0081 0.77 10.2 0.128
VS3 0.0081 0.77 10.2 0.128
S4 0.0063 0.88 10.2 0.128
S5 0.0063 0.88 10.2 0.128
M7 0.0045 0.98 10.2 0.128
M8 0.0047 1.03 10.2 0.128
L9 0.0039 1.1 10.2 0.128
LSA 47.2 6 wire
L9 0.0039 1.1 10.2 0.128
LSA 47.2 Auxil wdg: X1, X2 Auxil wdg: Z1, Z2
VS2 0.2 0.38
VS3 0.2 0.38
S4 0.195 0.40
S5 0.195 0.40
M7 0.165 0.33
M8 0.17 0.35
L9 0.168 0.34
LSA 47.2 6 wire
L9 0.168 0.34
LSA 47.2 No load At rated load
VS2 1 4
VS3 1 4
S4 0.9 3.4
S5 0.9 3.8
M7 1 3.65
M8 0.85 3.7
L9 0.95 3.75
LSA 47.2 6 wire
L9 0,95 3.75
LSA 47.2 Auxil wdg: X1, X2 Auxil wdg: Z1, Z2
50 Hz 70 V 10 V
60 Hz 85 V 12 V

17
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SPARE PARTS
3742 en - 06.2007 / d
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 - 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.
5.3 - Accessories
5.3.1 - Space heater for use when stopped
The space heater must run as soon as the alternator stops. It
is installed at the rear of the machine. Its standard power is
250W with 220V or 250W with 110V on request.
Warning: the power supply is present when the
machine has stopped.
5.3.2 - Temperature sensors with thermistors
(PTC)
These are thermistor triplets with a positive temperature
coefficient installed in the stator winding (1 per phase). There
can be a maximum of 2 triplets in the winding (at 2 levels:
warning and trip) and 1 or 2 thermistors in the shields.
These sensors must be linked to adapted sensing relays
(supplied optionally).
Cold resistance of cold thermistor sensors:
100 to 250 Ωper sensor.
5.3.3 - Connection accessories
- 6-wire machines
Requirements for coupling (F):
- 3 flexible shunts
- 12-wire machines
Requirements for coupling (F):
- 3 flexible shunts
After operational testing, replace all access panels
or covers.
Emergency kit SHUNT ALT 472 KS 001
AVR R250 AEM 110 RE 019
Diode bridge assembly ALT 421 KD 002
Surge suppressor CII 111 PM 005
Emergency kit AREP ALT 461 KS 001
AVR R448 AEM 110 RE 016
Diode bridge assembly ALT 421 KD 002
Varistance CII 111 PM 005
Single-bearing kit ALT 471 KB 002
Non drive end bearing RLT 075 TS 030
"O" ring JOI 160 TB 002
Preloading (wavy) washer RLT 160 RB 005
Double-bearing kit ALT 471 KB 001
Non drive end bearing RLT 075 TS 030
Drive end bearing RLT 090 TS 030
"O" ring JOI 160 TB 002
Preloading (wavy) washer RLT 160 RB 005

18
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SPARE PARTS
3742 en - 06.2007 / d
LEROY-SOMER
5.4 - Exploded view, parts list
5.4.1 - Single-bearing LSA 47.2
Ref. Qty Description Ref. Qty Description
1 1 Stator assembly 124 1 Terminal block
4 1 Rotor assembly 128 3 Starting range
15 1 Fan 130 1 Neutral link
21 1 Lifting ring 131 9 Terminal block terminal screws
28 1 Earth terminal 198 1 Voltage regulator (AVR)
30 1 DE flange 290 1 PMG housing
31 6 Fixing screws 291 1 Shaft adapter
33 1 Protective grille 292 1 Magnetic rotor
34 2 Fixing screws 293 1 Stator
36 1 Exciter end shield 294 2 Fixing screws
37 5 Fixing screws 295 1 Tie rod
41 1 Cover front panel 296 1 Cable gland washer + nut
48 1 Cover top panel 297 1 End plate
49 - Cover screws 322 3 Coupling disc
51 1 Air intake grille 323 8 Fixing screws
53 1 Plug 325 - Spacer shim
70 1 Non drive end bearing 343 1 Diode bridge assembly
71 1 Cover 347 1 Protection varistor (+ PCB)
72 2 Fixing screws 349 1 "O" ring
78 1 Inner bearing retainer 365 1 Cover rear panel
79 1 Preloading (wavy) washer 366 1 Side panel
90 1 Exciter field 367 1 Side panel with inspection door
91 4 Fixing screws 466 1 AVR inspection door
100 1 Exciter armature
343
100
347
78
79
349
70
90
365
466
130
1
36
37
198
34 4
28
41
49
366
367
51
128
33
124
91
131 21
53
48
72
71
290 291 292 293 294 295 296 297
323 322 325 31
15
30

19
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SPARE PARTS
3742 en - 06.2007 / d
LEROY-SOMER
5.4.2 - Double-bearing LSA 47.2
Ref. Qty Description Ref. Qty Description
1 1 Stator assembly 100 1 Exciter armature
4 1 Rotor assembly 124 1 Terminal block
15 1 Fan 128 3 Starting range
21 1 Lifting ring 130 1 Neutral link
22 1 Shaft extension key 131 9 Terminal block terminal screws
28 1 Earth terminal 198 1 Voltage regulator (AVR)
30 1 Drive end shield 284 1 Circlips
31 6 Fixing screws 290 1 PMG housing
33 1 Protective grille 291 1 Shaft adapter
34 2 Fixing screws 292 1 Magnetic rotor
36 1 Exciter end shield 293 1 Stator
37 5 Fixing screws 294 2 Fixing screws
41 1 Cover front panel 295 1 Tie rod
48 1 Cover top panel 296 1 Cable gland washer + nut
49 - Cover screws 297 1 End plate
51 1 Air intake grille 343 1 Diode bridge assembly
53 1 Plug 347 1 Protection varistor (+ PCB)
60 1 Drive end bearing 349 1 "O" ring
62 4 Fixing screws 365 1 Cover rear panel
68 1 Inner bearing retainer 366 1 Side panel
70 1 Non drive end bearing 367 1 Side panel with inspection door
71 1 Cover 466 1 AVR inspection door
79 1 Preloading (wavy) washer
90 1 Exciter field
91 4 Fixing screws
343
100
347
79
349
70
90
365
466
130
1
36
37
198
34 4
28
41
49
366
367
51
128
33
124
91
131 21
53
48
71
290 291 292 293 294 295 296 297
31
15
30 68
22 284
62
60

LEROY-SOMER 16015 ANGOULÊME CEDEX - FRANCE
338 567 258 RCS ANGOULÊME
S.A. au capital de 62 779 000 €
www.leroy-somer.com