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04 / e

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349
70
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1

LSA 47.2 - 4 POLES

ALTERNATORS
Installation and maintenance
 LEROY-SOMER INSTALLATION AND MAINTENANCE 3742 en - 2010.04 / e

LSA 47.2 - 4 POLES

ALTERNATORS

This manual concerns the alternator which We wish to draw your attention to the contents
you have just purchased. of this maintenance manual. By following
certain important points during installation,
The latest addition to a whole new generation use and servicing of your alternator, you can
of alternators, this range benefits from the look forward to many years of trouble-free
experience of the leading manufacturer operation.
worldwide, using advanced technology and
incorporating strict quality control.

SAFETY MEASURES WARNING SYMBOLS

Before using your machine for the first time, it is important to A set of self-adhesive stickers depicting the various warning
read the whole of this installation and maintenance manual. symbols is included with this maintenance manual. They
should be positioned as shown in the drawing below once the
All necessary operations and interventions on this machine machine has been fully installed.
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

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 Copyright 2005: LEROY-SOMER
characteristics of its products at any time in order to This document is the property of:
incorporate the latest technological developments. The MOTEURS LEROY-SOMER
information contained in this document may therefore be It may not be reproduced in any form without prior
changed without notice. authorization.
All brands and models have been registered and patents
applied for.

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 LEROY-SOMER INSTALLATION AND MAINTENANCE 3742 en - 2010.04 / e

LSA 47.2 - 4 POLES

ALTERNATORS

CONTENTS

1 - RECEIPT 5 - SPARE PARTS

1.1 - Standards and safety measures ....................4 5.1 - First maintenance parts .............................. 17

1.2 - Inspection ......................................................4 5.2 - Technical support service ........................... 17

1.3 - Identification...................................................4 5.3 - Accessories................................................. 17

1.4 - Storage ..........................................................4 5.4 - Exploded views, parts list............................ 18

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

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 LEROY-SOMER INSTALLATION AND MAINTENANCE 3742 en - 2010.04 / e

LSA 47.2 - 4 POLES

ALTERNATORS
RECEIPT

1 - RECEIPT 1.3 - Identification

The alternator is identified by means of a nameplate fixed on
1.1 - Standards and safety measures the machine (see drawing).
Make sure that the nameplate on the machine conforms to
Our alternators comply with most international standards and your order.
are compatible with: The machine name is defined according to various criteria, for
- the recommendations of the example: LSA 47.2 M7 C6/4 -
International Electrotechnical Commission • LSA: name used in the PARTNER range
IEC 34-1, (EN 60034). M: Marine
- the recommendations of the C: Cogeneration
International Standards Organisation ISO 8528. T: Telecommunications.
- the European Community directive 89/336/EEC on • 47.2: machine type
Electromagnetic Compatibility (EMC). • M7: model
- the European Community directives • C: excitation system
73/23/EEC and 93/68/EEC (Low Voltage Directive) (C: AREP/J: SHUNT or PMG/E: COMPOUND)
They are CE marked with regard to the LVD (Low Voltage • 6/4 : winding number / number of poles.
Directive) in their role as a machine component. A declaration
of incorporation can be supplied on request. 1.3.1 - Nameplate
Before using your generator for the first time, read carefully
the contents of this installation and maintenance manual, So that you can identify your machine quickly and accurately,
supplied with the machine. All operations performed on the we suggest you write its specifications on the nameplate
generator should be undertaken by qualified personnel with below.
specialist training in the commissioning, servicing and
maintenance of electrical and mechanical machinery. This 1.4 - Storage
maintenance manual should be retained for the whole of the
Prior to commissioning, machines should be stored:
machine’s life and be handed over with the contractual file.
- Away from humidity: in conditions of relative humidity of
The various operations described in this manual are
more than 90%, the machine insulation can drop very rapidly,
accompanied by recommendations or symbols to alert the
to just above zero at around 100%; monitor the state of the
user to the potential risk of accidents. It is vital that you
anti-rust protection on unpainted parts. For storage over an
understand and take notice of the different warning symbols
extended period, the machine can be placed in a sealed
used.
enclosure (heatshrunk plastic for example) with dehydrating
sachets inside, away from significant and frequent variations
1.2 - Inspection in temperature to avoid the risk of condensation during
On receipt of your alternator, check that it has not suffered storage.
any damage in transit. If there are obvious signs of knocks, - If the area is affected by vibration, try to reduce the effect of
contact the transporter (you may be able to claim on their these vibrations by placing the generator on a damper
insurance) and after a visual check, turn the machine by hand support (rubber disc or similar) and turn the rotor a fraction of
to detect any malfunction. a turn once a fortnight to avoid marking the bearing rings.

ALTERNATEURS ALTERNATORS
LSA Date PUISSANCE / RATING
Tension
N 5700 125897 A15 Hz Voltage
V
Min-1/R.P.M. 1500 Protection Ph.
Made in France - 1 024 959/a

Cos Ø /P.F. 0,8 Cl. ther. / Th.class Connex.

Régulateur/A.V.R. R 438 B
Continue kVA
Altit. m Masse / Weight
Continuous kW
Rlt AV/D.E bearing 6302 2 RS C3
40C A
Rlt AR/N.D.E bearing 6303 2 RS C3
Graisse / Grease 45g / 3600 h Secours kVA
Std by
Valeurs excit / Excit. values kW
en charge / full load 27C A
à vide / at no load (*) Tension maxi. / maximum voltage

166631 Conforme à C.E.I 60034-1. According to I.E.C 60034-1.

C US

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LSA 47.2 - 4 POLES

ALTERNATORS
TECHNICAL CHARACTERISTICS

2 - TECHNICAL CHARACTERISTICS - Cast iron end shields

- Protected ball bearings, greased for life
2.1 - Electrical characteristics - Mounting arrangements:
IM 1201 (MD 35) foot and flange mounted, single-bearing
The LSA 47.2 alternator is a machine without sliprings or with SAE coupling disc.
revolving armature brushes, wound as “2/3 pitch”, 6 or IM 1001 (B 34) double-bearing with SAE flange and standard
12-wire, with class H insulation and a field excitation system cylindrical shaft extension.
available in either SHUNT, AREP or "PMG" version (see - Drip-proof machine, self-cooled
diagrams). Interference suppression conforms to standard - Degree of protection: IP 23
EN 55011, group 1, class B.
2.2.1 - Mechanical options
2.1.1 - Electrical options
- Air inlet filter
- Stator temperature detection sensors - Regreasable ball bearings
- Bearing sensors (PTC, PT100, etc) - IP 44 protection
- Space heater

2.2 - Mechanical characteristics

- Steel frame

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

SHUNT SYSTEM
T1 T7 T2 T8 T3 T9
EXCITER
Varistor

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

R 250 Power supply / Detection

MAIN FIELD STATOR : 6 or 12-wire (marking T1 to T 12)

AREP SYSTEM Aux. windings
T1 T7 T2 T8 T3 T9
EXCITER
Varistor

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

R 450 Voltage reference

MAIN FIELD STATOR : 6 or 12-wire (marking T1 to T12)

PMG SYSTEM
T1 T7 T2 T8 T3 T9
EXCITER
Varistor

PMG

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

R 450 Voltage reference

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LSA 47.2 - 4 POLES

ALTERNATORS
INSTALLATION

3 - INSTALLATION 3.1.3 - Location

Ensure that the ambient temperature in the room where the
3.1 - Assembly 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
All mechanical handling operations must be recycling of hot air from the machine or engine, but also
undertaken using approved equipment. exhaust fumes.
Whilst being handled, the machine should remain
horizontal. 3.2 - Checks prior to first use
3.1.1 - Handling 3.2.1 - Electrical checks
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.
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,
3.1.2 - Coupling respecting the polarity.
- Open fully all the alternator openings.
3.1.2.1 - single-bearing alternator
- Run the alternator at its rated speed, and adjust the exciter
Before coupling the machines, check that they are compatible
field current using the rheostat to obtain the rated output
by:
current in the short-circuit connections.
- undertaking a torsional analysis of the transmission
Note: Prolonged standstill: In order to avoid these problems,
- checking the dimensions of the flywheel and its housing, the
we recommend the use of space heaters, as well as turning
flange, coupling discs and offset
over the machine from time to time. Space heaters are only
WARNING really effective if they are working continuously while the
machine is stopped.
When coupling the alternator to the prime mover, do not
use the fan to turn the alternator or rotor. 3.2.2 - Mechanical checks
The holes of the coupling discs should be aligned with
the flywheel holes by cranking the engine. Before starting the machine for the first time, check that:
Check that the “O” ring seal and the preloading (wavy) - all fixing bolts and screws are tight
washer are present in the NDE bearing seat. - the cooling air is drawn in freely
Check that there is lateral play on the crankshaft. - the protective grilles and housing are correctly in place
- the standard direction of rotation is clockwise as seen from
3.1.2.2 - double-bearing alternator the shaft end (phase rotation in order 1 - 2 - 3).
- Semi-flexible coupling For anti-clockwise rotation, swap 2 and 3.
Careful alignment of the machines is recommended, - the winding connection corresponds to the site operating
checking that the lack of concentricity and parallelism of both voltage (see section 3.3)
parts of the coupling do not exceed 0.1 mm.
This alternator has been balanced with a 1/2 key.

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LSA 47.2 - 4 POLES

ALTERNATORS
INSTALLATION

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.
Any intervention on the alternator terminals during
3.3.1 - Terminal connection: 12 wire reconnection or checks should be performed with
The connection accessories are detailed in section 5.3.3. the machine stopped.

Connection codes Voltage L.L Factory connection

A L1(U) Winding 50 Hz 60 Hz
T1 T7
3-phase 6 190 - 208 190 - 240
L3(W)
7 220 - T12 T6 T9 T3
T4 T10 N
L2(V)
T12 T5 8 - 190 - 208
T11 T5 T8 T2
T9 T2
T11 R 250 voltage sensing: L1(U)
T6 0 => (T8) / 110 V => (T11) T10 T4 T7 T1

L3(W) T3 T8 L2(V) R 450 voltage sensing: N NDE

0 => (T3) / 220 V => (T2)

Winding 50 Hz 60 Hz
T1 L1(U)
D 6 380 - 415 380 - 480
3-phase T4 L3(W)
T7
7 440 -
T12 T6 T9 T3
N 8 - 380 - 416 L2(V)
T10
T12 T11 T5 T8 T2
R 250 voltage sensing:
T9 L1(U)
T11 T5 0 => (T8) / 110 V => (T11)
T10 T4 T7 T1
T3 T6 T8 T2
R 450 voltage sensing:
N NDE
L3(W) L2(V) 0 => (T3) / 380 V => (T2)

9 - 600
Winding 9: R 450 voltage sensing + transformer (Diagram on request)

L1(U) Winding 50 Hz 60 Hz
F ( )
Single-phase
T12 T1 6 220 - 240 220 - 240
L3(W)*
or T9 T4 7 240 - 254 - T12 T6 T9 T3
3-phase T6 T7
L2(V)
8 - 220 - 240
T11 T5 T8 T2
T3 T10
R 250 voltage sensing: L1(U)
L3(W) L2(V)
T11 T8 T5 T2
L 0 => (T8) / 110 V => (T11) T1
L M
T10 T4 T7
AR M
Voltage LM = 1/2 voltage LL
R 450 voltage sensing:
0 => (T3) / 220 V => (T2) Operating phases L2 (V), L3 (W)
single phase

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 (*).

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LSA 47.2 - 4 POLES

ALTERNATORS
INSTALLATION

3.3.2 - Terminal connection: 6 wire (not possible with the R 250)

Connection codes Voltage L.L Factory connection

L1(U) Winding 50 Hz 60 Hz
D T1
3-phase
6S 380 - 415 380 - 480
L3(W)
7S 440 - T6 T3

N - L2(V)
T4
8S 380 - 416
T5 T2
T5 L1(U)
T6 R 450 voltage sensing:
T3 T2 0 => (T3) / 380 V => (T2) T4 T1
N
NDE
L3(W) L2(V)
9S - 600
Winding 9: R 450 voltage sensing + transformer (Diagram on request)

Winding 50 Hz 60 Hz ( )
F
Single-phase
L1(U)
6S 220 - 240 220 - 277 L3(W)
*
T6 T3
or 3-phase T6 T1 7S 240 - 254 -
L2(V)

8S - 220 - 240 T5 T2
L1(U)
T3 T4
T4 T1
R 450 voltage sensing: NDE
T5 T2 0 => (T3) / 220 V => (T2)
L3(W) L2(V) Operating phases: L2 (V), L3 (W) single phase

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 (*).

3.3.3 - Option connection diagram

A standard alternator is fitted with 3 starting ranges, 1 neutral
connection link.

R 791 T Interference suppression kit (standard for CE marking) Remote voltage potentiometer
Connections A D F

Black T1 T1 T1
Black T2 T2 T2
ST4
Black T3 T3 T3 Voltage adjustment
Blue N N via remote potentiometer
White

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LSA 47.2 - 4 POLES

ALTERNATORS
INSTALLATION

Current transformer connection

D connection - PH 1 D & A connection

In/2 - Secondary 1 A In/2 (D conn.) - Secondary 1 A
T4
P2 T10
6-wire P2
12-wire
P1 Neutral P1
Neutral
T4 link
link T10

Space heater PTC stator temperature sensors

130 C
103 blue wire
Ph1
101 250W - 220 V 150C
Ph2 black wire
102
Ph3 180 C
104 red/white wire

3.3.4 - Connection checks 3.4 - Commissioning

Electrical installations must comply with the current The machine can only be started up and used if the
legislation in force in the country of use. installation is in accordance with the regulations
Check that: and instructions defined in this manual.
- The residual circuit-breaker conforms to legislation on The machine is tested and set up at the factory. When first
protection of personnel, in force in the country of use, and has used with no load, make sure that the drive speed is correct
been correctly installed on the alternator power output as and stable (see the nameplate). With the regreasable bearing
close as possible to the alternator. (In this case, disconnect option, we recommend greasing the bearings at the time of
the wire of the interference suppression module linking the commissioning (see 4.2.3).
neutral). On application of the load, the machine should achieve its
- Any protection devices in place have not been tripped. rated speed and voltage; however, in the event of abnormal
- If there is an external AVR, the connections between the operation, the machine setting can be altered (follow the
alternator and the cabinet are made in accordance with the adjustment procedure in section 3.5). If the machine still
connection diagram. operates incorrectly, the cause of the malfunction must be
- There is no short-circuit phase-phase or phase-neutral located (see section 4.4).
between the alternator output terminals and the generator set
control cabinet (part of the circuit not protected by circuit-
3.4.1 - Special type of use
breakers or relays in the cabinet).
- The machine should be connected with the busbar
separating the terminals as shown in the terminal connection WARNING
diagram.

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LSA 47.2 - 4 POLES

ALTERNATORS
SERVICING - MAINTENANCE

4 - SERVICING - MAINTENANCE 4.2.4 - Electrical servicing

Cleaning product for the windings
4.1 - Safety measures

WARNING
Do not use: trichlorethylene, perchlorethylene,
Servicing or troubleshooting must be carried out trichloroethane or any alkaline products.
strictly in accordance with instructions so as to
avoid the risk of accidents and to maintain the Certain strictly defined pure volatile degreasing agents can be
machine in its original state. used, such as:
- Normal petrol (without additives)
- Toluene (slightly toxic); inflammable
- Benzene (or benzine, toxic); inflammable
- Ciclohexare (non toxic); inflammable
All such operations performed on the alternator
should be undertaken by personnel trained in the Cleaning of the stator, rotor, exciter and diode bridge
commissioning, servicing and maintenance of The insulating components and the impregnation system are
electrical and mechanical components. not at risk of damage from solvents (see the above list of
authorised products).
Before any intervention on the machine, ensure that it cannot Avoid letting the cleaning product run into the slots. Apply the
be started by a manual or automatic system and that you product with a brush, sponging frequently to avoid
have understood the operating principles of the system. accumulation in the housing. Dry the winding with a dry cloth.
Let any traces evaporate before reassembling the machine.
4.2 - Routine maintenance
4.2.5 - Mechanical servicing
4.2.1 - Checks after start-up
After approximately 20 hours of operation, check that all fixing WARNING
screws on the machine are still tight, plus the general state of
the machine and the various electrical connections in the Cleaning the machine using water or a high-
installation. pressure washer is strictly prohibited.
Any problems arising from such treatment are not
4.2.2 - Cooling circuit covered by our warranty.
It is advisable to check that circulation of air is not reduced by
Degreasing: Use a brush and detergent (suitable for
partial blocking of the air intake and outlet grilles: mud, fibre,
paintwork).
grease, etc.
Dusting: Use an air gun.
If filters have been added to the machine after manufacture
4.2.3 - Bearings and do not have thermal protection, the service personnel
The bearings are regreasable (option). It is advisable to should clean the air filters periodically and systematically, as
lubricate the machine during operation. Time intervals and often as is necessary (every day in very dusty atmospheres).
quantity of grease are given in the table below. The filter cant be cleaned with air gun in case of dry dust.
NDE/DE bearing 6318 C3 6315 C3 The filter must be changed in case of greasy dust.
After cleaning the alternator, it is essential to check the
Quantity of grease 41 g 30 g winding insulation (see sections 3.2 and 4.8).
Regreasing interval 3500 hrs 4500 hrs

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.

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LSA 47.2 - 4 POLES

ALTERNATORS
SERVICING - MAINTENANCE

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
Fault Action
Excessive temperature rise in one or both - If the bearing has turned blue or if the grease has turned black, change the bearing.
Bearing bearings (bearing temperature more than - Bearing not fully locked (abnormal play in the bearing cage).
80°C) with or without abnormal bearing noise. - Check the end shield alignment (flange not properly fitted).
- Air flow (intake-outlet) partially clogged or hot air is being recycled from the
Excessive temperature rise in the alternator
Abnormal alternator or engine
housing (more than 40° C above the ambient
temperature - Alternator operating at too high a voltage (> 105% of Un on load)
temperature)
- Alternator overloaded
- Misalignment (coupling)
Excessive vibration
- Defective mounting or play in coupling
Vibration - Rotor balancing fault (Engine - Alternator)
Excessive vibration and humming noise - Phase imbalance
coming from the machine - Stator short-circuit
- System short-circuit
- Mis-paralleling
Possible consequences:
Abnormal Alternator damaged by a significant impact, - Broken or damaged coupling
noise followed by humming and vibration - 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.

4.5 - Electrical faults

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

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LSA 47.2 - 4 POLES

ALTERNATORS
SERVICING - MAINTENANCE

4.5.1 - Checking the winding Assembly A: Connect a 12 V battery in series with a rheostat
of approximately 50 ohms - 300 W and a diode on both exciter
You can check the winding insulation by performing a high field wires (5+) and (6-).
voltage test. In this case, you must disconnect all AVR wires.

ASSEMBLY A 6 - Exciter field 5 +

WARNING
Diode 1A Rh. 50Ω -300W
Damage caused to the AVR in such conditions is
not covered by our warranty.
+
-

After operational testing, replace all access panels 12V battery

or covers.

4.5.2 - Checking the diode bridge Assembly B: Connect a “Variac” variable power supply and
a diode bridge on both exciter field wires (5+) and (6-).
A diode in good working order should allow the current to flow
Both these systems should have characteristics which are
only in the anode-to-cathode direction
compatible with the field excitation power of the machine (see

Anode A Cathode
the nameplate).
3) Run the unit at its rated speed.
C 4) Gradually increase the exciter field current by adjusting the
- + rheostat or the variac and measure the output voltages on L1
C C C A C - 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
A A A 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).

- ~ ~ ~ - - + ASSEMBLY B 6 - Exciter field 5+

C A
C C C
40
50 60 +
30

70

Diode 1A
20

80
10

90

A A A 0 100

- DC
Variac AC 12V
4.5.3 - Checking the windings and rotating 220V
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.

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 LEROY-SOMER INSTALLATION AND MAINTENANCE 3742 en - 2010.04 / e

LSA 47.2 - 4 POLES

ALTERNATORS
SERVICING - MAINTENANCE

4.6 - Dismantling, reassembly 4.6.3 - Access to diodes

(see sections 5.4.1 & 5.4.2) - Open the air intake grille (51).
- Disconnect the diodes.
- Check the 6 diodes using an ohmmeter or a battery lamp
WARNING (see section 4.5.2).
If the diodes are faulty,
During the warranty period, this operation should - Remove the surge suppressor (347).
only be carried out in an LEROY-SOMER approved - Remove the 6 "H" nuts for mounting the diode bridges on the
workshop or in our factory, otherwise the warranty support.
may be invalidated. - Change the crescents, respecting the polarity.
Whilst being handled, the machine should remain
horizontal (rotor not locked in position). 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).
4.6.1 - Tools required - Remove the shield (36).
- Take out the antifriction bearing (70) using a puller with a
To fully dismantle the machine, we recommend using the
central screw (see drawing below).
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

IDENTIFICATION screw Ø Torque N.m

Field screw M6 10 - Fit the new antifriction bearing onto the shaft after heating it
Diode nut M6 4 by induction to approximately 80 °C.
Flange/frame screw M 12 69 - Mount the new preloading (wavy) washer (79) + the new “O”
NDE shield/frame screw M 12 69 ring seal (349) in the shield (36).
If using a single-bearing or double-bearing machine with the
Disc/Sleeve screw M 16 170
regreasable bearing option:
Earth screw M 10 20 - Screw a threaded rod into the thrust bearing (78).
Grille screws M6 5 - Refit the end shield on the machine using a dowel and nut
Cover screws M6 5 in the shaft extension (see drawing).
Terminal block nut M 12 35 - Slide the threaded rod into the shield hole to make it easier
Earth screw M 12 35 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.

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 LEROY-SOMER INSTALLATION AND MAINTENANCE 3742 en - 2010.04 / e

LSA 47.2 - 4 POLES

ALTERNATORS
SERVICING - MAINTENANCE

4 78 36
Threaded rod

Dowel
Nut

Rotor

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

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 LEROY-SOMER INSTALLATION AND MAINTENANCE 3742 en - 2010.04 / e

LSA 47.2 - 4 POLES

ALTERNATORS
SERVICING - MAINTENANCE

4.6.9 - Dismantling and reassembly of the 4.7.2 - Electrical connection

filters - Connect the 3 PMG wires (14/15/16), the 2 exciter wires (5/
- Remove the grille (417) then take out the filter (418). Change 6) and the above-mentioned 2 voltage sensing wires (2/3)
the filter if necessary; please refer to section 4.2.5 for according to the connection diagram (see section 2.3.2).
cleaning the filter. Mounting the PMG on an AREP machine:
To replace, follow the instructions in reverse order. - 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.

51
WARNING
With the PMG, check that the ST9 jumper is open circuit.
418

417

After operational testing, replace all access panels

or covers.

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).

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 LEROY-SOMER INSTALLATION AND MAINTENANCE 3742 en - 2010.04 / e

LSA 47.2 - 4 POLES

ALTERNATORS
SERVICING - MAINTENANCE

4.8 - Table of characteristics 4.8.2 - Voltage of auxiliary windings at no load

Table of average values LSA 47.2 Auxil wdg: X1, X2 Auxil wdg: Z1, Z2
Alternator - 4 poles - 50 Hz - Standard winding No. 6. 50 Hz 70 V 10 V
(400V for the excitation values) 60 Hz 85 V 12 V
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)
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

Resistance of AREP auxiliary windings at 20 °C (Ω)

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

Field excitation current i exc (A)

Symbols: “i exc”: excitation current of the exciter field.
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

For 60 Hz machines, the “i exc” values are approximately 5 to

10% lower.

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 LEROY-SOMER INSTALLATION AND MAINTENANCE 3742 en - 2010.04 / e

LSA 47.2 - 4 POLES

ALTERNATORS
SPARE PARTS

5 - SPARE PARTS 5.3 - Accessories

5.1 - First maintenance parts 5.3.1 - Space heater for use when stopped
Emergency repair kits are available as an option. The space heater must run as soon as the alternator stops. It
They contain the following items: is installed at the rear of the machine. Its standard power is
250W with 220V or 250W with 110V on request.
Emergency kit SHUNT ALT 472 KS 001
AVR R 250 AEM 110 RE 019
Diode bridge assembly ALT 421 KD 002
Surge suppressor CII 111 PM 005

Emergency kit AREP ALT 461 KS 001 Warning: the power supply is present when the
AVR R 450 AEM 110 RE 031 machine has stopped.
Diode bridge assembly ALT 421 KD 002
Varistance CII 111 PM 005 5.3.2 - Temperature sensors with thermistors
(PTC)
Single-bearing kit ALT 471 KB 002 These are thermistor triplets with a positive temperature
Non drive end bearing RLT 075 TS 030 coefficient installed in the stator winding (1 per phase). There
"O" ring JOI 160 TB 002 can be a maximum of 2 triplets in the winding (at 2 levels:
Preloading (wavy) washer RLT 160 RB 005 warning and trip) and 1 or 2 thermistors in the shields.
These sensors must be linked to adapted sensing relays
Double-bearing kit ALT 471 KB 001 (supplied optionally).
Cold resistance of cold thermistor sensors:
Non drive end bearing RLT 075 TS 030
100 to 250 Ω per sensor.
Drive end bearing RLT 090 TS 030
"O" ring JOI 160 TB 002 5.3.3 - Connection accessories
Preloading (wavy) washer RLT 160 RB 005
- 6-wire machines

Requirements for coupling (F):

- 3 flexible shunts
5.2 - Technical support service
Our technical support service will be pleased to provide any - 12-wire machines
additional information you may require.
Requirements for coupling (F):
When ordering spare parts, you should indicate the complete - 3 flexible shunts
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, After operational testing, replace all access panels
we recommend the use of original manufacturer spare parts. or covers.
In the event of failure to comply with this advice, the
manufacturer cannot be held responsible for any damage.

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 LEROY-SOMER INSTALLATION AND MAINTENANCE 3742 en - 2010.04 / e

LSA 47.2 - 4 POLES

ALTERNATORS
SPARE PARTS

5.4 - Exploded view, parts list

5.4.1 - Single-bearing LSA 47.2

366 48
130
49 466
365
131 21
53
128 72
71
41

124

198

367
31
325
322
323

37
51
36
90
91
79
349
70
78
100
347
343
28
1
4
34
33
15
30 297
296
295
294
293
292
291
290

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

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 LEROY-SOMER INSTALLATION AND MAINTENANCE 3742 en - 2010.04 / e

LSA 47.2 - 4 POLES

ALTERNATORS
SPARE PARTS

5.4.2 - Double-bearing LSA 47.2

366 48
130
49 466
365
131 21
53
128 71

41

124

198

367
31
60
284
22
62

37
51
36
90
91
79
349
70
100
347
343
28

1
4
34
33
15
68 297
30 296
295
294
293
292
291
290

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

19
LEROY-SOMER 16015 ANGOULÊME CEDEX - FRANCE
338 567 258 RCS ANGOULÊME

www.leroy-somer.com