Leroy-Somer LSA 47.2 Instruction Manual

Leroy Somer
Alternators
LSA 47.2 – 4 POLES
SHUNT - AREP - PMG
Réf. constructeur :
3742en-04.2003/a Réf. GPAO : 33522060501 ind1
Users guide and maintenance
manual

This manual is to be given to
the end user
LSA 47.2 - 4 POLES
ALTERNATORS
343 107
100
347
78
349
70
1
34
4
28
33
15
3
0
Installation and maintenance
3742 en - 04.2003 / a

2
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
3742 en - 04.2003 / a
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 2003: 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
ARNING

3
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
3742 en - 04.2003 / a
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
2.3 - SHUNT excitation system .............................. 6
2.4 - AREP/PMG excitation system ....................... 7
3 - INSTALLATION
3.1 - Assembly ........................................................ 9
3.2 - Checks prior to first use .................................. 9
3.3 - Terminal connection diagrams .......................10
3.4 - Commissioning ..............................................12
3.5 - Setting up .......................................................13
4 - SERVICING - MAINTENANCE
4.1 - Safety measures ............................................16
4.2 - Routine maintenance .....................................16
4.3 - Fault detection ...............................................17
4.4 - Mechanical defects ........................................17
4.5 - Electrical faults ...............................................18
4.6 - Dismantling, reassembly ............................... 20
4.7 - Installation and maintenance of the PMG ..... 22
4.8 - Table of characteristics ................................. 23
5 - SPARE PARTS
5.1 - First maintenance parts ................................. 24
5.2 - Technical support service ............................ 24
5.3 - Accessories ................................................. 24
5.4 - Exploded views, parts list ............................ 25

4
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
RECEIPT
3742 en - 04.2003 / a
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
àvide / at no load
Made in France - 1 024 959/a
Tension
Voltage
Secours
Std by
40°C
(*) Tension maxi. / maximum voltage
27°C
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 - 04.2003 / a
LEROY-SOMER
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
T1 T2 T3
T4 T5 T6
Varistor
5+ 6-
T7 T8 T9
T10 T11 T12
R 230
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

6
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
TECHNICAL CHARACTERISTICS
3742 en - 04.2003 / a
LEROY-SOMER
2.3 - SHUNT excitation system
The alternator with Shunt excitation is self-excited with an
R 230 voltage regulator. The regulator monitors the
excitation current of the exciter as a function of the alternator
output voltage. Very simple in design, the alternator with
shunt excitation has no sustaining short-circuit capacity.
2.3.1 - R 230 AVR
- Voltage regulation: around ± 0.5%
- Voltage sensing range 85 to 139 V (50/60 Hz)
- Rapid response time (500 ms) for a transient voltage
variation amplitude of ± 20%
- Voltage setting P1
- Stability setting P2
- Power supply protected by 8 A fuse, slow action (tolerates
10 A for 10 s)
- Frequency: 50 Hz with ST3 jumper - 60 Hz without ST3
jumper
- Factory-set underspeed protection P3
2.3.2 - R 230 AVR options
Potentiometer for remote voltage adjustment, 1000 Ω /0.5 W
min: adjustment range ± 5%.
Remove the ST4 jumper.
2.3.3 - Additional functions
with the R 448
As an option, the LSA 47.2 SHUNT alternator can work
with
the R 448 AVR in order to obtain the following functions:
- Parallel operation between alternators with C.T.
- Parallel operation with the mains with C.T. and R 726 module
- 3-phase sensing (R 731 module)
- LAM function integrated in the R 448 AVR
In this case, the R 448 AVR replaces the R 230.
For adjustment and maintenance, refer to section 3.5 of this
manual.
5+
6 -
F1
ST4
75 mm
140 mm
115 mm
4 x Ø5.8 x 50 mm
E+
E-
0V 110
P3
P1
P2
ST3
50Hz 60Hz
R 230
Exciter
field
Voltage reference
Under-speed
Stability
Slow fuse
250V 8 A
Voltage
Potentiometer for remote
voltage adjustment
Frequency
100 %
50 Hz 60 Hz Hz
50 Hz
48 Hz 57.5 Hz
60 Hz
Voltage Bend
U/UN
Frequency
R 448
0V E— E+ Z2 X1 Z1 X2
5+
6—
S1
S2
ST4
Fuse
50Hz
60Hz
(POWER SUPPLY
110 V : 1/2 phase)
EXCITER
ST3
3 ph
P1
P2
S1
S2
U
L1
L3
VW
L2
380 V 220 V 110 V
1 A
ALTERNATOR

7
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
TECHNICAL CHARACTERISTICS
3742 en - 04.2003 / a
LEROY-SOMER
2.4 - AREP/PMG excitation system
For both AREP & PMG excitation systems, the alternator
voltage regulator is the R 448.
With AREP excitation, the electronic AVR is powered by two
auxiliary windings which are independent of the voltage
sensing circuit. The first winding (X1, X2) has a voltage
proportional to that of the alternator (Shunt characteristic), the
second (Z1, Z2) has a voltage in proportion with the stator
current (compound characteristic: Booster effect). The power
supply voltage is rectified and filtered before being used by
the AVR monitoring transistor. As a result the machine has a
short-circuit current capacity of 3 IN for 10 s, and good
immunity to distortions generated by the load.
With PMG excitation, a permanent magnet generator (PMG)
is added to the alternator. This is fitted at the rear of the
machine and connected to the R 448 AVR. The PMG supplies
the AVR with voltage which is independent of the main
alternator winding. As a result the machine has a short-circuit
current capacity of 3 IN for 10 s, and good immunity to
distortions generated by the load.
The AVR monitors and corrects the alternator output voltage
by adjusting the excitation current.
2.4.1 - R448 AVR characteristics
- shunt power supply: max 140V - 50/60 Hz
- rated overload current: 10A - 10s
- electronic protection (overload, voltage sensing opening
short-circuit): excitation overload current for 10 s then return
to approximately 1A.
The alternator must be stopped (or the power switched off,
see section 3.5.3) in order to reset the protection.
- Fuse:
•F1 on X1,X2.
- voltage sensing: 5 VA isolated via transformer
0-110 V terminals = 95 to 140 V
0-220 V terminals = 170 to 260 V
0-380 V terminals = 340 to 520 V
- voltage regulation ± 0.5%
- normal or rapid response time via ST2 jumper
- voltage adjustment via P2 potentiometer
other adaptation transformer voltages
- current sensing: (parallel operation):
C.T. 2.5 VA cl1, secondary 1A (optional)
- quadrature droop adjustment via potentiometer P1
- underspeed protection (U/f) and LAM: frequency threshold
adjustable via potentiometer P4
- max. excitation current adjustment via P5: 4 to 10A
- 50/60 Hz selection via ST3 jumper
2.4.2 - R 448 power supply connection
AREP excitation
X2
X1
Z2
E+
E-
0V
110
220
380
Z1
L2(V)
L3
(W)
340-520V
170-260V
R448
P5
P2
P4
P3
R731
T.I.
ST4
Option
Option
Option
S1 S2
P1
ST1
ST6
Single-phase
detection
46.2
47.1
49.1
3-ph detection
Excitation
ceiling
Under-
speed
Stability
External potentiometer
for adjusting the voltage
Voltage
Quad droop
Field
Pwr supply
(see 2.3.2)
95-140V
AREP
PMG
ST9
ST3 50Hz 60Hz
4 x fl5.8 x 175 x 115
200 x 140 mm
ST2
ST10
ST5
LAM 15%
LAM 25%
5+ 6 -
F1
Frequency
normal fast
Response time
With LAM W/o LAM
Slow fuse
250V 10 A
Aux. windings
Yellow
Red
Green
Black
5 + 6 -
Exciter field
X2
Z1
X1
Z2
E+
E -
R448

8
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
TECHNICAL CHARACTERISTICS
3742 en - 04.2003 / a
LEROY-SOMER
PMG excitation
2.4.3 - Frequency compared with voltage
(without LAM)
2.4.4 - LAM characteristics
The LAM system is integrated in the regulator and is active as
standard (ST5 with bridge). It can be deactivated by removing
the ST5 bridge.
The LAM can be adjusted to 15% or 25% by means of the
ST10 jumper.
- Role of the “LAM”(Load Adjustment Module):
On application of a load, the rotation speed of the generator
set decreases. When it passes below the preset frequency
threshold, the LAM causes the voltage to drop by
approximately 15% or 25% and consequently the amount of
active load applied is reduced by approximately 25% to 45%,
until the speed reaches its rated value again.
Hence the LAM can be used either to reduce the speed
variation (frequency) and its duration for a given applied load,
or to increase the applied load possible for one speed
variation (turbo-charged engine).
To avoid voltage oscillations, the trip threshold for the LAM
function should be set approximately 2 Hz below the lowest
frequency in steady state.
Use of the LAM at 25% is recommended for load impacts ≥
70% of the genset rated power.
2.4.5 - R 448 AVR options
- Current transformer for parallel operation
of ....../1 A - 2.5 VA CL 1 (See the diagram included with this
manual).
- Rhe remote voltage adjustment potentiometer:
470 Ω , 3 W min: adjustment range ± 5% (range limited by
internal voltage potentiometer P2). Remove ST4 to connect
the potentiometer. (A 1 k Ω potentiometer can also be used to
extend the adjustment range to ± 10%).
- R 731 module : detection of 200 to 500V 3-phase voltage,
compatible with parallel operation. Disconnect ST1 to
connect the module; set the voltage via the module
potentiometer.
- R 726 module : regulation system changed to "4-function".
(See the maintenance manual and connection diagram.)
•PF regulation ϕ (2F)
•voltage matching before paralleling (3 F)
•mains connection of alternators already running in parallel
(4F)
The R 726 module is connected in place of ST4.
PMG
5 +
14
15
16
6 -
X2
Z1
X1
Z2
E+
E -
R448
100 %
50 Hz 60 Hz Hz
50 Hz
48 Hz 57.5 Hz
60 Hz
Voltage Bend
U/UN
Frequency
LAM
UN
048 or 57.5 Hz
0.85 UN
Voltage
U/f
50 or 60 Hz
fC fN
Voltage
ST5 disconnected
ST3
P2
P4
Underspeed and LAM
- P4 trip threshold
for LAM or U/F
factory preset.
LAM 15 %
UN
0
0
.9
0
.8
(U/f)
LAM
0.9
0.8
1 s 2 s 3 s
Time
(s)
fNLAM
Typical effects of the "LAM" with a diesel engine -
LAM
with LAM without LAM (U/F only)
Transient voltage drop
Max. speed drop
Variation in the load
Load on the shaft (kW)
Voltage
Frequency
Power
Load shedding due to "LAM"

9
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
INSTALLATION
3742 en - 04.2003 / a
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
ARNING

10
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
INSTALLATION
3742 en - 04.2003 / a
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 230 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 230 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 230 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)

11
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
INSTALLATION
3742 en - 04.2003 / a
LEROY-SOMER
3.3.2 - Terminal connection: 6 wire (not possible with the R 230)
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

12
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
INSTALLATION
3742 en - 04.2003 / a
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.
3.3.5 - Electrical checks on the AVR
- Check that all connections have been made properly as
shown in the attached wiring diagram.
- Check that the ST3 frequency selection jumper is on the
correct frequency setting.
- Check whether the ST4 jumper or the remote adjustment
potentiometer have been connected.
- Optional operating modes
•ST1 jumper: open circuit to connect the R 731 3-phase
sensing module.
•ST2 jumper: open circuit for rapid response time
•ST5 jumper: open to suppress the LAM function.
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).
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
150°C
black wire
180°C
red/white wire
250W - 220 V

13
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
INSTALLATION
3742 en - 04.2003 / a
LEROY-SOMER
3.5 - Setting up
The various adjustments during tests must be
made by a qualified engineer.
Ensure that the drive speed specified on the
nameplate is reached before commencing
adjustment
1500 min-1/50Hz or 1800 min-1/60 Hz.
Do not try to set the voltage if the frequency or
speed is not correct (risk of irreparable rotor
damage).
The AVR is used to make any adjustments to the machine.
After operational testing, replace all access panels
or covers.
3.5.1 - R 230 settings
Shunt excitation system
Initial potentiometer settings
- P1 potentiometer (AVR voltage adjustment): fully anti-
clockwise
- Remote voltage adjustment potentiometer: centre position
Run the alternator at its rated speed. If the voltage does not
increase, the magnetic circuit should be remagnetized (see
section 4.5)
- Turn the AVR voltage adjustment potentiometer P1 slowly
until the output voltage rated value is obtained
- Adjust the stability setting using P2
- Sealed potentiometer P3 is factory set at 48 Hz for 50 Hz
and 57.5 Hz for 60 Hz
3.5.2 - R 448 settings
SHUNT, AREP or PMG excitation system
Before any intervention on the AVR, make sure that the
ST9 jumper is closed with AREP excitation and open
circuit with PMG excitation.
a) Initial potentiometer settings (see table below)
- Remote voltage adjustment potentiometer: centre (ST4
jumper removed).
Adjustments in standalone operation
b) Install a D.C. analogue voltmeter (needle dial) cal. 100V on
terminals E+, E- and an A.C. voltmeter cal 300 - 500 or 1000V
on the alternator output terminals.
c) Make sure that the ST3 jumper is positioned on the desired
frequency (50 or 60 Hz).
d) Voltage potentiometer P2 at minimum, fully anti-clockwise.
e) Turn the V/Hz potentiometer P4 fully clockwise.
WARNING
ARNING
WARNING
ARNING
Action Factory setting Pot.
P2
P3
P4
P1
P5
10 A
maximum
400V - 50 Hz
(Input
0 - 380 V)
Not set
(centre position)
If ST3 = 50 Hz
(factory) = 48 Hz
If ST3 = 60 Hz
(factory) = 58 Hz
Not set
(fully anti-
clockwise)
Excitation ceiling
Limit of excitation and
short-circuit current,
minimum fully anti-clockwise
Voltage quadrature droop
(// operation with C.T.)
- 0 quadrature droop fully
anti-clockwise.
Voltage
minimum fully anti-clockwise
Stability
Threshold/LAM or U/F
Underspeed protection
and "LAM" trip threshold
Maximum frequency fully
anti-clockwise
Potentiometer
factory sealed

14
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
INSTALLATION
3742 en - 04.2003 / a
LEROY-SOMER
f) Turn the stability potentiometer P3 anti-clockwise to 2
marks away from the central position.
g) Start the engine and set its speed to a frequency of 48 Hz
for 50 Hz, or 58 for 60 Hz.
h) Set the output voltage to the desired value using P2.
- Rated voltage UN for solo operation (eg. 400 V)
- Or UN + 2 to 4% for parallel operation with C.T. (eg. 410 V -)
If the voltage oscillates, use P3 to make adjustments (try both
directions) observing the voltage between E+ and E- (approx.
10V D.C.). The best response times are obtained at the limit
of the instability. If no stable position can be obtained, try
disconnecting or replacing the ST2 jumper (normal/fast).
i) Check LAM operation: ST5 closed.
j) Turn potentiometer P4 slowly anti-clockwise until there is a
significant voltage drop (approximately 15%)
k) Vary the frequency (speed) around 48 or 58 Hz according
to the operating frequency, and check the change in voltage
from that observed previously (approximately 15%).
l) Readjust the speed of the unit to its rated no-load value.
Adjustments in parallel operation
Before any intervention on the alternator, make
sure that the speed droop is identical for all
engines.
m) Preset for parallel operation (with C.T. connected to S1,
S2 on connector J2)
- Potentiometer P1 (quadrature droop) in centre position.
Apply the rated load (cos Ø= 0.8 inductive).
The voltage should drop by 2 to 3%. If it increases, swap the
2 incoming wires of the C.T. secondary.
n) The no-load voltages should be identical for all the
alternators intended to run in parallel.
- Couple the machines in parallel
- By adjusting the speed, try to obtain 0 KW
power exchange.
- By altering the voltage setting P2 or Rhe on one of the
machines, try to cancel (or minimise) the current circulating
between the machines.
From now on, do not touch the voltage settings.
o) Apply the available load (the setting is only correct if a
reactive load is available)
- By altering the speed, match the KW (or divide the rated
power of the units proportionally)
- By altering the quadrature droop potentiometer P1, match or
divide the currents.
3.5.3 - Max. excitation setting (excitation
ceiling)
Adjustment of the current limit
via potentiometer P5 (fuse rating: 8A-10 seconds).
The maximum factory setting corresponds to that of the
excitation current required to obtain a 3-phase short-circuit
current of approximately 3 IN at 50 Hz for industrial power,
unless otherwise specified(*).
A static method can be used to reduce this value or adapt the
Isc to the actual operating power (derated machine), which is
safer for the alternator and the installation. Disconnect power
supply wires X1,X2 and Z1,Z2 and the voltage reference (0-
110V-220V-380V) from the alternator.
Connect the mains power supply (200-240V) as indicated
(X1,X2). Install a 10A D.C. ammeter in series with the exciter
field. Turn P5 fully anti-clockwise and activate the power
supply. If there is no output current from the AVR, turn
potentiometer P2 (voltage) clockwise until the ammeter
indicates a stable current. Switch the power supply off, then
on again, turn P5 clockwise until the required max. current is
obtained (no more than 10 A).
Checking the internal protection:
Open switch (D): the excitation current should increase to its
preset ceiling, remain at that level for ≥10 seconds and then
drop to < 1A.
To reset, switch off the power supply by opening switch (A).
Note: After setting the excitation ceiling as described, adjust
the voltage again (see section 3.5.2.) via P2.
(*): In some countries it is a legal requirement to have a short-
circuit current, so as to offer discriminating protection.
WARNING
ARNING
depending on the mains frequency
Max. excitation
Voltage
Field ~ 10 ohms
X2
Z1
X1
Z2
E+
E-
0V
110 V
220V
380V
50Hz 60Hz
P2
P3
P4
P5
ST3
15A DC
R 448
ST4
A+
-
A
D

15
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
INSTALLATION
3742 en - 04.2003 / a
LEROY-SOMER
3.5.4 - Special type of use
- Field weakening
The exciter is switched off by disconnecting the AVR power
supply (1 wire on each auxiliary winding); contact rating: 16 A
- 250V A.C.
Connection is identical for resetting the AVR internal
protection.
- Field forcing
Applications B volts Time t
Guaranteed voltage build-up 12 (1A) 1 -2 s
Parallel operation, de-energized 12 (1A) 1 -2 s
Parallel operation, at standstill 24 (2A) 5 - 10 s
Frequency starting 48 (4A) 5 - 10 s
Sustained voltage on overload 48 (4A) 5 - 10 s
AREP / PMG
X2
Z1
X1
Z2
E+
X2
Z1
X1
Z2
E+
E-
Battery (B Volt)
+
-
t
(400V - 10A)
Exciter field
~ 10 ohms
Diode
t
B Volt
Field forcing
Time
R 448

16
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SERVICING - MAINTENANCE
3742 en - 04.2003 / a
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
ARNING
WARNING
ARNING

17
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SERVICING - MAINTENANCE
3742 en - 04.2003 / a
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
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.

18
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SERVICING - MAINTENANCE
3742 en - 04.2003 / a
LEROY-SOMER
4.5 - Electrical faults
Fault Action Effect Check/Cause
No voltage at
no load on
start-up
Connect a new battery
of 4 to 12 volts to
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

19
INSTALLATION AND MAINTENANCE
LSA 47.2 - 4 POLES
ALTERNATORS
SERVICING - MAINTENANCE
3742 en - 04.2003 / a
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
ARNING
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. 50½ -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