Nidec LSA 52.3 Instruction Manual

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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators - 4 pole
Installation and maintenance

Electric Power Generation
Installation and maintenance
5382 en - 2022.11 / h
LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
__________________________________________________________________________________________________
2
TABLE OF CONTENTS
1. GENERAL INFORMATION 4
1.1 INTRODUCTION 4
1.1.0 General information 4
1.1.1 Safety Notes 4
1.1.2 Conditions of use 4
1.1.2.1 Generalities 4
1.1.2.2 Vibration analysis 4
1.1.2.3 Short-circuit capacity 4
1.1.2.4 Object projection risk 5
1.2 GENERAL DESCRIPTION 5
1.2.1 Generator (arep) 5
1.2.2 Excitation system 5
2. DESCRIPTION OF SUB-ASSEMBLIES 5
2.1 - STATOR 5
2.1.1 Stator of the electric machine 5
2.1.2 Excitation field winding 6
2.1.3 Stator protection 6
2.1.3.1 Heating resistance 6
2.1.3.2 Stator winding temperature sensor 6
2.1.3.3 Stator air temperature probe 6
2.1.3.4 Bearing vibration sensor 6
2.2 ROTOR 7
2.2.1 Pole wheel (laminated) 7
2.2.2 Excitation armature 7
2.2.3 Fan (machines: IC 0 A1) 7
2.2.4 Rotating diode bridge 7
2.2.5 Balancing (single fan machine) 7
2.3 TERMINAL BOX 8
2.3.0 Description (on damper buffers) 8
2.3.1 Automatic voltage regulator (AVR) 8
2.4 NAMEPLATES 8
2.4.1. Main nameplate 8
2.4.2. Lubrication nameplate 8
2.4.3. Rotation direction nameplate 8
2.5 ROLLER-BEARING 8
2.5.0 Description of roller-bearings 8
2.5.1 Bearing protection devices 8
2.10 AIR FILTERS 9
2.12 TRANSPORT LOCKING SYSTEM 9
2.12.0 General information 9
2.12.1 Machines with bearings 9
2.12.1.0 General information 9
2.12.1.1 Double roller bearing machine 9
2.12.1.2 Single roller bearing machine 9
3. INSTALLATION 10
3.1 TRANSPORT AND STORAGE 10
3.1.1 Transportation 10
3.1.2 Warehouse Storage 10
3.1.3 Storage in maritime packaging 10
3.1.4 Unpacking and Installation 10
3.1.5 Roller bearing storage measures 10
3.1.6 Uncovered machinery storage measures 10
3.2 INSTALLATION OF THE MACHINE 11
3.2.1 Coupling Assembly (double-bearing
machine only) 11
3.2.2 Stator attaching 11
3.3 MACHINE ALIGNMENT 11
3.3.1 General information concerning the
alignment 11
3.3.1.1 General information 11
3.3.1.2 Shaft elevation caused by heat rise 11
3.3.1.3 Elevation of the shaft of a roller bearing
machine 11
3.3.1.4 Inspection of the generator before
alignment 11
3.3.1.5 Alignment procedure with the “double
concentricity” method 11
3.3.2 Alignment of a double-flanged bearing
machine 12
3.3.2.1 Machines without axial play (standard) 12
3.4 ELECTRICAL CONNECTIONS 13
3.4.0. General information 13
3.4.1 Phase Order 13
3.4.1.1 Standard units; IEC 34-8 13
3.4.1.2 Upon request; NEMA 14
3.4.2 Insulation distances 14
3.4.3 Added products in the terminal box 14
4. START-UP 15
4.1 ELECTRICAL START-UP INSPECTION 15
4.1.0 General information 15
4.1.1 Insulation of the winding 15
4.1.2 Electrical connections 15
4.1.3 Parallel operation 15
4.1.3.1 Definition of parallel operation 15
4.1.3.2 Possibility of parallel operation 15
4.1.3.3 Parallel coupling 15
4.2 MECHANICAL START-UP INSPECTION 15
4.2.0 General information 15
4.2.0.1 Alignment; attachment; drive motor 15
4.2.0.2 Cooling 15
4.2.0.3 Lubrication 15
4.2.1 Starting roller-bearing machines 15
4.2.2 Terminal Box start-up 16
4.2.3 Vibrations 16
4.3 START-UP SEQUENCES 16

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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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3
4.3.1 Machine stopped checks 16
4.3.2. Machine running checks 16
4.3.2.0 Rotor speed ramp-up (Standard Machine)
16
4.3.2.1 Checks of machine running without
excitation 16
4.3.2.2 Checks of excited machine running with no
load 16
4.3.2.3 Generator and site safety parameter 16
4.3.2.4 Checks of machine running under full load
checks 16
4.3.3 Generator start-up checklist 17
5. MAINTENANCE AND SERVICING 19
5.0 GENERAL INFORMATION 19
5.1 PREVENTIVE MAINTENANCE
PROGRAMME 20
5.1.0 General information 20
5.1.1 Stator 20
5.1.2 Rotor 20
5.1.3 Terminal box 20
5.1.4 Roller bearing 21
5.1.5 Rubber dampers 21
5.1.6 Filters 21
5.1.7 Protection devices 21
5.2 AIR GAP CHECK 22
5.2.1 General information 22
5.2.2 Double-bearing machine 22
5.3 BEARINGS 22
5.3.1 General information 22
5.3.2 Cleaning of old bearing grease 22
5.3.3 Cleaning of the bearing assembly area 23
5.3.4 Bearing disassembly 23
5.3.5 Bearing reassembly 23
5.4 LUBRICANTS 24
5.4.1 Greases 24
5.5 AIR FILTER 24
5.5.1 Cleaning 24
5.5.1.1 Air Filter Cleaning Frequency 24
5.5.1.2 Air filter cleaning procedure 24
5.6 SCREW TIGHTENING 24
5.6.0 General information 24
5.6.1 Steel screws in steel tapping 25
5.6.2 Plugs 25
5.6.3 Electrical contact 25
5.6.4 Rotating diodes 25
5.6.5 Synthetic parts 25
5.7 ELECTRICAL MEASURING
INSTRUMENTS 25
5.7.1 Instruments used 25
5.8 INSULATION CHECK OF WINDINGS 25
5.8.0 General information 25
5.8.1 Insulation measurement 26
5.8.2 Polarisation Index 26
5.9 ROTARY DIODE BRIDGE TEST 27
5.10 COIL CLEANING 27
5.10.0 General information 27
5.10.1 Coil cleaning products 27
5.10.2 Cleaning Operation 27
5.11 WINDING DRYING 28
5.11.0 General information 28
5.11.1 Drying Method 28
5.11.1.1 General information 28
5.11.1.2 Drying generator in a stopped position 28
5.11.1.3 Drying generator in rotation 28
5.12 NEW VARNISH APPLICATION 29
5.13 TERMINAL BOX 29
5.14 SPARE PARTS 29
5.15 MECHANICAL DEFECTS 30
5.16 ELECTRICAL FAULTS 31
6. TYPICAL ASSEMBLIES AND DRAWINGS
32
6.1 MACHINE SECTION VIEWS 32
6.1.1 Machine type A52.3 32
6.1.2 Machine type A53; A54 34
6.2 ROLLER BEARING MOUNTING 35
6.2.1 Machines A52, A53 and A54; standard 35
7. STANDARD SAFETY REGULATIONS 36
7.1 EUROPEAN REGULATIONS AND
DIRECTIVES 36
7.1.1 Low Voltage Machines 36
7.1.2 Medium and High Voltage Machines 37
7.1.3 Short circuit capacity of the terminal box 38

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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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4
1. GENERAL INFORMATION
1.1 INTRODUCTION
1.1.0 General information
This manual provides installation, operation and
maintenance instructions for synchronous machines. It also
describes the basic construction of these machines. This
manual is general; it applies to an entire group of
synchronous generators. Additionally, in order to make
information-finding easier, Section 1, "Characteristics and
Performance", has been included, describing the machine
completely (type of construction, type of bearing, IP Code,
etc.); this will enable you to identify directly the chapters
which apply to your machine.
This synchronous machine has been designed for a
maximum length of service. To achieve this, it is necessary
to pay special attention to the chapter concerning the
periodic maintenance schedule for the machines.
1.1.1 Safety Notes
The warnings "DANGER, CAUTION, NOTE" are used to
draw the user’s attention to different points:
DANGER:
THIS WARNING IS USED WHEN AN OPERATION,
PROCEDURE, OR USE MAY CAUSE PERSONAL
INJURY OR LOSS OF LIFE.
CAUTION:
THIS WARNING IS USED WHEN AN OPERATION,
PROCEDURE, OR USE MAY CAUSE DAMAGE TO OR
DESTRUCTION OF EQUIPMENT.
NOTE:
This warning is used when a delicate operation,
procedure, or installation requires clarification.
1.1.2 Conditions of use
1.1.2.1 Generalities
A machine must only be installed and operated, by
qualified and trained persons.
Any technician using or maintaining this machine must be
authorised to do so by the local labour laws (e.g. holder of
a certification for working on high voltage systems).
Operation which require handling must be done by
qualified persons (Slinging techniques; use of lifting
devices, etc.). Local procedures must be strictly complied
with Any product (sealing paste, cleaning product, etc.)
used during maintenance or servicing must comply with
local regulations and environmental standards.
The disposal of waste coming from servicing the machine
must be managed in compliance with the local regulations
and environmental standards in force.
The main characteristics of this machine are summarized
in "Section 1" of this manual.
Any operating condition other than those specified by the
original tender must receive a Leroy-Somer agreement.
Any modification of the machine structure must receive
approval from Leroy-Somer.
1.1.2.2 Vibration analysis
It is the responsibility of the generator set manufacturer to
ensure that the different assembled system will be vibratory
compatible in terms of vibration. (ISO 8528-9 and
BS5000-3).
It is the responsibility of the generator set manufacturer to
ensure that the shaft line torsional analysis has been done
and accepted by the different parties (ISO 3046).
CAUTION:
EXCEEDING THE LEVEL OF VIBRATIONS ALLOWED
BY THE STANDARD ISO 8528-9 & BS5000-3 MAY
CREATE SERIOUS DAMAGE (BEARING DAMAGE,
STRUCTURAL CRACKS, ETC.).
EXCEEDING THE LEVEL OF TORSIONAL VIBRATION
OF THE SHAFT LINE (e.g.ABS, LLOYD, ETC.) MAY
CAUSE SERIOUS DAMAGE (CRANKSHAFT FAILURE,
GENERATOR SHAFT FAILURE, ETC.).
Refer to chapter 2.1.3.4 for further information about the
accepted vibration level of the standard ISO 8528-9 and
BS5000-3, consult chapter 2.1.3.4.
1.1.2.3 Short-circuit capacity
In the event of a fault, the terminal box is designed to
support the maximum current level generated by the
alternator.
If the current is higher than these levels, as may be the
case with a fault coming from the electricity grid, the
protection of the alternator must be ensured by the
protective device of the installation.
CAUTION:
THE ALTERNATOR IS A SUB-ASSEMBLY SUPPLIED
WITHOUT A SHORT-CIRCUIT PROTECTION DEVICE.

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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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5
1.1.2.4 Object projection risk
DANGER:
IN THE EVENT OF A MAJOR ACCIDENT, DEBRIS CAN
BE EJECTED FROM THE MACHINE THROUGH THE
AIR INLET OR OUTLET OPENINGS. THESE DEBRIS
CAN CAUSE A FATAL ACCIDENT. DO NOT ENTER
HAZARDOUS AREAS DURING MACHINE OPERATION.
NOTE:
This risk must be considered in the risk analysis of the
site concerned.
1.2 GENERAL DESCRIPTION
1.2.1 Generator (arep)
The synchronous generator is an alternating-current
machine, without ring or brush. The machine is cooled by
the flow of air through the machine.
Use the drawings of chapter 10 in order to better
understand the machine.
The Automatic Voltage Regulator (item 6) supplies the
inductor exciter field (static part; item 1) with DC current.
The Exciter (item "1" & "2”) works as an inverse alternator.
The Exciter armature (rotating part; item 2) generates a
three-phase current which supplies the rotating diode
bridge (rotating part; item 3).
The Rotating diode bridge (rotating part; item 3) rectifies
the three-phase current into DC current which supplies the
Pole wheel (rotating part; item 4).
The pole wheel (rotating part; item 4) excites the alternator
armature (static part; item 5) which generates a three-
phase current.
5
4
3
1
2
6
H1
H3
1- Excitation field winding
2- Excitation armature
3- Rotating diodes bridge
4- Revolving field
5- Alternator armature
6- Automatic Voltage Regulator
H1- AREP winding harmonic detection 1
H3- AREP winding harmonic detection 3
1.2.2 Excitation system
The excitation system is mounted at the rear of the
machine.
2. DESCRIPTION OF SUB-ASSEMBLIES
2.1 - STATOR
2.1.1 Stator of the electric machine
The alternator stator is a stack of low loss steel magnetic
laminations assembled under pressure. The stator coils are
inserted and blocked in the slots, then impregnated with
varnish and polymerised (VPI system).
1
2
3
4
(a)
(c)
(b)
5
1 - Stator
2 - Rotor
3 - Exciter
4 - Rotating diodes
5 - Fan
a - Stator Air inlet (cold air)

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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
__________________________________________________________________________________________________
6
b - Stator air exhaust (warmed air)
c – Rotating diodes air cooling
2.1.2 Excitation field winding
The excitation field winding comprises a wound solid
element.
The excitation is equipped with a flange at the rear bearing
of the machine.
2.1.3 Stator protection
2.1.3.1 Heating resistance
The heating element avoids internal condensation during
the shutdown periods. It is connected to the terminals of
the main terminal box. The resistance heater is switched
on as soon as the machine is shut down.
The electrical characteristics are provided in Section 1
"Technical Characteristics".
2.1.3.2 Stator winding temperature sensor
The temperature sensors are located in the zone assumed
to be the hottest part of the machine. The sensors are
connected to a terminal box.
Depending on the insulation class of the machine, the
temperature of the sensors must not exceed a maximum
of:
INSULATION CLASS ALARM TRIPPING
H
180 °C 185 °C
To improve the protection of the machine, we recommend
setting the alarm set-point according to the actual
conditions of the site obtained after a representative
operating time:
Alarm temperature (*) = Highest recorded temp + 10°K
Trip temperature (*) = Alarm temperature + 5 °K
(*) do not exceed the values of the previous table.
(*) Max. recommended temp: Maximum temperature
measured at the stator after a representative operating
time under severe operating conditions.
E.g. a class H insulation machine of 3000 kVA reached a
maximum of 110°C at the stator after a representative time
of operation at the site. Set the alarm temperature to 120°C
instead of 180°C indicated in the previous chart. Set the
trip setting to 125°C instead of the 185°C shown in the
previous table.
2.1.3.3 Stator air temperature probe
As an option an RTD or thermostat can measure the stator
air inlet temperature (cold air).
Stator air inlet temperature; Alarm points and shutdown:
• alarm Nominal air inlet stator + 5 K
• shutdown 80°C
Stator air outlet temperature; Alarm points and shutdown:
• alarm Nominal air inlet stator + 35K
• shutdown Nominal air inlet stator + 40K
NOTE:
For an open machine the nominal air temperature entering
the stator corresponds to the ambient temperature.
NOTE:
If quickly restarting after a shut-down, inhibit the stator air
sensor safety "alarm" for a few seconds (no more than 30
s) during the machine start up.
NOTE:
For a water cooled machine (CACW) the nominal air
entering the stator may be approximated as following:
Tair entering stator = Twater entering cooler + 15°K.
2.1.3.4 Bearing vibration sensor
This chapter concerns the adjustment of seismic sensors.
For more information on adjusting proximity sensors, see
Chapter 2.2.6.1.
The level of vibration of the machines depends directly on
the use made of them and on the characteristics of the site.
We propose the following adjustment:
Vibration Alarm (*) = Site Highest Vibration level + 50%
Vibration Trip = Vibration Alarm + 50%
(*) do not exceed the values of the following chart.
The machines are engineered to be able to withstand the
vibration level specified by the standard ISO8528-9 and
BS5000-3.
Maximum levels for: Internal combustion engines
alternating current motors
Nominal speed
(rpm)
kVA Generator vibration level
(nominal conditions)
Overall
(mm/s rms)
(2–1000 Hz)
Any harmonics
1300 to 2199 > 250 < 20
< 0.5 mm; pp
(5 – 8 Hz)
< 9 mm/s; rm
(8 – 200 Hz)
721 to 1299 ≥250 < 20
>
1250
< 18
≤720 >
1250
< 15
< 10 (*)
(*) generator on concrete base
Maximum levels for: Turbines
Turbines
(hydraulics; gas; steam)
Max. recommended value:
4.5
(global; mm/s (rms)

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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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2.2 ROTOR
2.2.1 Pole wheel (laminated)
The pole wheel is produced by stacking cut laminations to
reproduce the profile of the pole (item 1).
Stacking of steel laminations is completed at each end by
high electrical conductivity laminations (item 2).
In order to allow the alternators to run in parallel, and so as
to ensure stability, bars with high electrical conductivity are
inserted in holes passing through the poles from one end to
the other. These bars are welded together with the end
plates so as to obtain a complete cage (or LEBLANC
damper cage).
The winding (item 4) is wound on the pole and then
impregnated.
The winding is made of insulated copper wire of
rectangular cross-section and high electrical conductivity.
Aluminium plates (item 5) are pressed against the winding
acting as dissipating radiators and ensuring excellent
wedging of the coils.
Retaining bars (item 6) on each pole protect the heads of
the coils from centrifugal forces.
The wound pole wheel is heated and shrink fitted onto the
shaft.
2.2.2 Excitation armature
The excitation armature is made by stacking magnetic steel
laminations. These steel laminations are held in place by
rivets.
The excitation armature is keyed and heat-shrunk onto the
shaft.
The windings are enamelled copper wires, class "F"
insulation (or "H", depending on the customer's request or
size of the machine).
2.2.3 Fan (machines: IC 0 A1)
The synchronous machine is characterized by a self-
ventilation system. A centrifugal fan is mounted between
the revolving field coil and the front bearing.
Air intake is at the rear of the machine and the exhaust at
the front.
The fan consists of a hub, which is keyed and heat-shrunk
onto the shaft. The fan is made of welded steel sheet,
attached to the hub by screws. Ventilation is obtained by
means of inclined blades. The air is exhausted by
centrifugation. The air inlet and outlet must remain free
during operation.
2.2.4 Rotating diode bridge
The rectifier bridge, comprising six diodes, is placed at the
rear of the machine. The rotating bridge is made of
fibreglass with a printed circuit to connect the diodes
together. This bridge is supplied with alternating current by
the excitation armature and supplies direct current to the
pole wheel. The diodes are protected against over voltage
by rotating resistors, or by varistors. These resistors (or
varistors) are mounted in parallel with the pole wheel.
+
-
1
2
3
1 - Field
2 - Rotating resistors / varistors
3 - Exciter armature
The 2 radiators of the diode bridge are connected to the
pole wheel.
1 - Radiator 1
2 - Radiator 2
The diode fastening screws must be tightened to the
correct torque.
CAUTION:
THE ROTATING DIODE FASTENING SCREWS MUST
BE TIGHTENED USING A TORQUE WRENCH
CALIBRATED TO THE RECOMMENDED TORQUE.
2.2.5 Balancing (single fan machine)
The complete rotor was balanced as per the ISO8221
standard to achieve a residual imbalance of less than:
1
2
2
2
3
4
5
6
Radiator 2
Radiator 1

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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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8
Generator set: Class G2.5
Turbine: Class G1
The shaft end is cold-stamped to indicate the type of
balancing (as per ISO8221)
H: balancing with Half-key carried out as
standard
F: balancing with Full key (upon request)
N: balancing without key (upon request)
The balancing is carried out in two planes.
The first is on the fan. It is recommended, when the fan is
refitted (after servicing) to follow the initial indexing.
The second is at the rear of the machine.
The coupling must be balanced to adapt to the generator
rotor balancing.
2.3 TERMINAL BOX
2.3.0 Description (on damper buffers)
Use the attached Terminal box drawing.
The openings provide access to the terminals.
The gland plates are made of non-magnetic materials in
order to avoid circulating currents.
If accessories not supplied by Leroy-Somer have to be
installed in the terminal box (CT’s, VT’s, Shunt, etc.) refer
to chapter.3.4.3.
In order to limit the level of vibration of the accessories
contained in the terminal box, the terminal box is mounted
on rubber damper pads.
CAUTION:
RUBBER DAMPERS MUST BE CHECKED
PERIODICALLY AND REPLACED EVERY FIVE YEARS.
2.3.1 Automatic voltage regulator (AVR)
When the automatic voltage regulator is located in the
terminal box, it is fitted on a separate plate, insulated from
vibration by means of dampers. The operation of the
regulator is explained in Section 3.
2.4 NAMEPLATES
2.4.1. Main nameplate
The main nameplate is fitted to the stator. It gives the
manufacturer's electrical characteristics, the type of
machine and its serial number. The serial number is
necessary for any contact with the factory.
For machines with anti-friction bearings lubrication
parameters are indicated.
2.4.2. Lubrication nameplate
The machines with anti-friction bearings have the
lubrication parameters indicated on the main nameplate
fixed on the stator, indicating:
• Type of bearing
• Grease change frequency
• Amount of grease
• Grease type
2.4.3. Rotation direction nameplate
Located on the stator an arrow indicates the direction of
rotation.
2.5 ROLLER-BEARING
2.5.0 Description of roller-bearings
The bearings ensure the guiding of rotor rotation and its
axial positioning.
The bearings are protected from ambient dust by baffles.
They can be replaced.
The bearings must be lubricated regularly. The old grease
is forced out at the lower part of the bearings by the force
of the new grease being injected.
2.5.1 Bearing protection devices
Optionally, the bearing can be equipped with RTD sensors
to detect possible heating.
For special use in warm surroundings where the
temperature of the bearings exceeds the authorised limit
(for a bearing known to be in good condition), contact us.
Bearing; Alarm points and shutdown:
• alarm 90°C (194°F)
• shutdown 95°C (203°F)
To improve the machine protection we recommend to set
the alarm point following effective site conditions:
Alarm temperature (*) = Highest recorded temp + 15°K
(*) do not exceed the values of the previous table.
E.g. On-site, the normal temperature of the bearing is
60°C. Set the alarm temperature to 75°C instead of the
90°C shown in the previous table.
NOTE:
Specific dedicated devices based on the analysis of the
vibration signal are able to monitor bearings behaviour.

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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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9
2.10 AIR FILTERS
Only use approved filters. Any filter not correctly
engineered may conduce to air flow restriction and then to
abnormal generator cooling or to dust entering the
generator.
2.12 TRANSPORT LOCKING SYSTEM
2.12.0 General information
With certain types of machines, the alternator comes with a
rotor locking system for transport.
The locking systems must be removed just before the final
installation of the alternator and reinstalled if the alternator
is later re-transported. It is recommended to lock the rotor
during transport.
NOTE:
The locking systems are painted red or yellow.
CAUTION:
THE ROTOR LOCKING SYTEM MUST REMAIN IN
PLACE IF THE ALTERNATOR IS GOING TO BE
TRANSPORTED.
NOTE:
Maritime and rail transport are particularly demanding
for the alternator.
2.12.1 Machines with bearings
2.12.1.0 General information
In case of re-use of the locking system for transport, the
system must be reinstalled taking care not to touch any
parts other than the shaft. If necessary, rotate the shaft so
that the locking system does not touch the rotor cables.
CAUTION:
THE ROTOR LOCKING FASTENING SCREW MUST BE
TIGHTENED TO THE NOMINAL RECOMMENDED
TORQUE (see chapter 5.6).
NOTE:
PMGs have very low air gaps, and may be damaged
during the installation of the transport locking system.
CAUTION:
FOR SINGLE-BEARING PMG MACHINES, THE PMG
ROTOR MUST BE DISASSEMBLED BEFORE
INSTALLING ANY LOCKING SYSTEM FOR
TRANSPORT.
NOTE:
Leroy-Somer only provides the transport system
specific to the alternator transported alone. Upon
request Leroy-Somer can provide a locking system for
the transported alternator coupled to its “prime
mover”.
Rear bearing; Locking system examples:
1
2
3
3
1
2
3
3
1 - Cable
2 – Red label out of the alternator indicating a Locking
system
3 – Rotor locking system
2.12.1.1 Double roller bearing machine
A locking system is installed on the opposite side to the
shaft end in order to load the roller bearing sufficiently and
eliminate any possible movement of the rollers on their
tracks.
2.12.1.2 Single roller bearing machine
Machine transported alone:
On the front bearing, a threaded rod lifts the rotor and
brings it into contact with the stator. The rotor is locked
axially and radially.
Transported machine coupled to its prime mover
(single roller bearing machine only):
A locking system is installed on the opposite side to the
shaft end in order to load the roller bearing sufficiently and
eliminate any possible movement of the rollers on their
tracks.

Electric Power Generation
Installation and maintenance
5382 en - 2022.11 / h
LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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10
3. INSTALLATION
3.1 TRANSPORT AND STORAGE
3.1.1 Transportation
During transport the level of intermittent shocks suffered by
the machines must remain below 30 m/s2.
Machines equipped with roller bearing(s) must have their
rotor locked during the transport to avoid any "false
brineling" problem.
The temperature of the machine must remain between
-20°C and +70°C. However, it is possible to go down to
-40°C if not for more than a few hours.
The machine must be protected against the weather and
condensation.
3.1.2 Warehouse Storage
This chapter applies to machinery not protected by a
sealed package (for machinery with a sealed package, see
Chapter 3.1.3).
The machinery must be stored in a clean and dry place
which is not subject to sudden temperature changes or
high humidity (75 % maximum).
Storage at an ambient temperature of +5 to +45°C is
recommended.
The machine must not be subject to vibrations greater than
1mm/s rms.
CAUTION:
THE RESISTANCE HEATER MUST BE CONTINUOUSLY
SWITCHED ON.
3.1.3 Storage in maritime packaging
The synchronous machine was hermetically sealed in the
factory and then packed in a wooden box (SEI class 4c
standard).
Storage in a hermetically sealed package and wooden box
made by Leroy-Somer is guaranteed 2 years. In this case,
there is no special weatherproof precaution to be taken.
In this case, the precautionary measures in Chapter 3.1.5;
3.1.6; 3.1.7; 3.1.8 do not apply.
The machine must not be subject to vibrations greater than
1mm/s rms.
CAUTION:
BREAKING THE HERMETIC PROTECTIVE FILM
DISCHARGES LEROY-SOMER OF ITS LONG STORAGE
GUARANTEE.
3.1.4 Unpacking and Installation
DANGER:
THE DEDICATED LIFTING HOOKS MUST BE USED TO
LIFT THE MACHINE WITH SLINGS (ONE HOOK AT
EACH CORNER OF THE MACHINE).
Rotors of machines with Sleeve bearings and single-
bearing machines, are blocked during transportation so as
to avoid any movement. Withdraw the retaining bars. The
retaining bar is screwed to the end of the shaft and to the
front support.
CAUTION:
TRANSPORT LOCKING DEVICES PAINTED RED OR
WITH RED STICKER MUST BE REMOVED.
The end of the shaft is protected from corrosion. Clean it
before coupling.
The resistance heater must be switched on at all times.
Before starting the machine up again, it will be necessary
to carry out a start-up inspection.
3.1.5 Roller bearing storage measures
This chapter must be followed if a machine remains
stationary for more than 6 months.
After 6 months of stop; lubricate by injecting two times the
grease volume used for a standard maintenance.
Then, every 3 months turn the machine shaft line by a few
turns while injecting a standard grease volume.
3.1.6 Uncovered machinery storage measures
For an uncovered machine, it is recommended to close the
air inlet and outlet.

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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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11
3.2 INSTALLATION OF THE MACHINE
3.2.1 Coupling Assembly (double-bearing
machine only)
The coupling must be balanced separately before being
assembled on the machine shaft. Refer to the balancing
instructions in chapter 2.2.5.
The shrinking of the half coupling onto the electrical
machine shaft end must be chosen, by the generator set
manufacturer, in such way as it should be removable for
maintenance (e.g. bearing change).
3.2.2 Stator attaching
Four plates on the chassis allow the unit to be attached
onto a pallet.
The fixing bolts must support the forces created by the
static and dynamic loads.
The machine may be positioned by means of 4 dowel pins.
The dowel pins make later realignment easier. (The use of
pins is optional).
The machine may be aligned through the use of 4 jacking-
screws. These jacking-screws allow the machine to be
positioned along the various axes.
3.3 MACHINE ALIGNMENT
3.3.1 General information concerning the alignment
3.3.1.1 General information
Alignment is intended to achieve coaxiality of the driving
and driven shafts under nominal operating conditions
(machine running; at its operating temperature).
The machine must be aligned according to the Leroy-
Somer standard and adhere to the manufacturer's
alignment standard for the drive machine.
When heating the machine has its shaft line which grow up.
Between stop and rotation the shaft axis location inside its
bearing is different. The total axis height elevation is
composed of the thermal elevation and of the bearing
elevation.
CAUTION:
THE ALIGNMENT MUST BE DONE TAKING INTO
ACCOUNT, THE CORRECTION FOR THE THERMAL
EXPANSION OF THE SHAFT.
The correct locating of the parts must be obtained by
inserting shims under the machine feet.
The double-bearing machines are mounted with bearings
(ball or roller) or Sleeve bearings. The axial clearance of
the bearings (if the machine has Sleeve bearings) must be
distributed as uniformly as possible, taking into account the
axial thermal expansion. The roller bearing machines with
a positioning bearing (standard machine) do not have axial
play.
The machines are delivered with the rotor mechanically
centred (axially and radially) in relation to the stator.
CAUTION:
THE ALIGNMENT STANDARDS OF MOTOR
MANUFACTURERS ARE FREQUENTLY MORE
ACCURATE THAN THOSE OF LEROY-SOMER.
3.3.1.2 Shaft elevation caused by heat rise
H(m) = Height of the machine axis
∆T= frame temperature rise = 30°C
λ= Coefficient of steel elongation = 0.012 °K-1
3.3.1.3 Elevation of the shaft of a roller bearing
machine
Caused by heat rise in the anti-friction bearing itself.
1 - cold, in rotation, or stopped
2 - hot, in rotation, or stopped
3.3.1.4 Inspection of the generator before alignment
Check the out-of-round of the generator shaft tip.
The total reading must be within a tolerance of 0.04 mm.
NOTE:
RUN OUT CHECK CAN BE INFEASABLE ON SLEEVE
BEARING MACHINE BECAUSE OF THE TOO HIGH
NECESSARY TURNING TORQUE NEEDED TO TURN
THE ROTOR.
3.3.1.5 Alignment procedure with the “double
concentricity” method
NOTE:
LASER DEVICES CAN MAKE THE JOB EASIER THAN
WITH THE PROCEDURE INDICATED.
This method is not sensitive to axial movements.
(Alignment methods using axial measurement are often
disrupted by a small axial movement of the rotor).
It is possible to check the alignment with the coupling
installed.
Equipment required:
Two rigid supports. The rigidity of the two supports is very
important.
Two micrometers
∆
H (mm) =λ
(°K
-1
)
.H
(m)
.
∆T(°K)
"2"
Y ° 0,01 mm
"1"

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Industrial Range Alternators
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12
Implementation:
During the measurements, both shafts must turn
simultaneously in the same direction. (For example: the
coupling installed with its screws loosened). By turning
both shafts simultaneously, the measurement is not
affected by the error resulting from run out of the two shaft
ends.
C1
C2
A
B
3h
9h
12h
6h
L
The "C1" and "C2" micrometers are located at an angular
difference of 180°.
The longer the distance "L" the higher the sensitivity for
detecting angular errors.
The reading should be performed 4 times for the "C1" and
"C2" micrometers: at 12h, 3h, 6h, 9h.
It is recommended to record the results and draw the axes
for better evaluation, as explained below. Interpretation of
measurements by means of an example.
Values given in millimetres. The reading is considered
positive (+) when the micrometer stylus is pushed inwards.
MEASUREMENTS
C1
C2
A
B
3h
9h
12h
6h
+ 0.90
+ 1,04
+ 1.34
+ 1.00
+ 0.86
+ 1.64
+ 1.02
+ 0.70
L=400
Measurements referring to the vertical plane:
Considering the vertical plane "C1": The vertical action
towards the top of shaft "A" on the micrometer is dominant.
In the plane "C1" the axis "A" is higher than axis "B”
(0.9 – 1) / 2 = - 0.05 mm
In the vertical plane "C2", the vertical action towards the
top of shaft "B" on the micrometer is greater.
In the plane "C2" the axis "B" is higher than axis "A"
(1.34 – 1.02) / 2 = 0.16 mm
The respective position of the axes is as follows:
A
B
C1
C2
0.05
0.16
Regarding the vertical plane, the angular alignment error is:
(0.16 + 0.05) *100 / 400 = 0.0525 mm/100mm (not
acceptable).
Measurements referring to the horizontal axis:
In the plane "C1" the axis "B" is further to the right than "A”
(1.04 – 0.86) / 2 = 0.09 mm
In the plane "C2" the axis "B" is further to the left than "A”
(0.70 – 1.64) / 2 = - 0.47 mm
The representation of the shafts is as follows:
A
B
C1
C2
0.09
0.47
Regarding the horizontal plane the angular error is:
(0.47 + 0.09) *100/ 400 = 0.14 mm/100mm
(not acceptable)
In the both planes the parallelism error is:
mm103.095
22
=+
or
mm496.04716
22
=+
(not
acceptable)
3.3.2 Alignment of a double-flanged bearing machine
3.3.2.1 Machines without axial play (standard)
Alignment must take into account, coupling tolerances.
CAUTION:
A MISALIGNMENT EVEN IF ACCEPTABLE BY THE
COUPLING MUST NOT CREATE UNACCEPTABLE
STRESS LEVELS FOR THE BEARING.
Shafts alignment limits to comply with:
0.05 mm
100 mm
0.08 mm
Parallel Error
Angular error
To check the alignment, there are different methods: the
"double concentricity" method is described in the
"alignment procedure" chapter 3.3.1.6.

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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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13
3.4 ELECTRICAL CONNECTIONS
3.4.0. General information
The installation must comply with the electrical schematics
attached in Section 5.
Check that all the protection devices are correctly
connected and in good working order.
The assembler has the responsibility to mechanically and
electrically protect the generator within the best practice
rules and to secure any operation over the defined tender
(respect of capability curve; overspeed, etc.).
For low-voltage machines, power supply cables must be
connected directly to the machine terminals (without adding
washers, etc).
For high-voltage machines, power supply cables should be
connected to separate terminals or to current transformer
terminals.
NOTE:
The gland plate is made of non-magnetic material.
CAUTION:
DO NOT ADD WASHERS TO THE POWER SUPPLY
CABLE TERMINALS OTHER THAN THOSE USED BY
THE MANUFACTURER OF THE ELECTRIC MACHINE.
Make sure the lugs are tight. Refer to chapter 5.8.
CAUTION:
ALL CURRENT TRANSFORMERS MUST BE
CONNECTED OR SHUNTED.
CAUTION:
THE VOLTAGE TRANSFORMER MUST NEVER BE
SHUNTED.
CAUTION:
THE INSTALLED POWER CABLES MUST BE
FASTENED AND SUPPORTED IN SUCH A WAY AS TO
BE ABLE TO WITHSTAND THE VIBRATION LEVEL
REACHED BY THE GENERATOR IN OPERATION (refer
to chapter 2.1.3.4).
The power cables must not stress (push, pull, flex, etc.) the
generator terminals.
3.4.1 Phase Order
3.4.1.1 Standard units; IEC 34-8
Except by special request of the customer, the phase-
sequence is chosen as per the IEC 34-8 standard.
An arrow located on the front bearing indicates the
direction of rotation.
In the terminal box a specific marking plate indicates the
specific generator phase sequence.
Clockwise rotation viewed
from the shaft drive end
Counter clockwise rotation
viewed from the shaft
drive end
The phases are identified:
U1, V1, W1.
The phases are identified:
U1, V1, W1.
The installer connects the
following:
L1 --> U1
L2 --> V1
L3 --> W1
The installer connects the
following:
L3 --> U1
L2 --> V1
L1 --> W1
U2
V2
W2
U1
V1
W1
L1
L2
L3
U2
U1
V1
W1
L3
L2
L1
V2
W2

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Industrial Range Alternators
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14
3.4.1.2 Upon request; NEMA
An arrow located on the front bearing indicates the
direction of rotation.
In the terminal box a specific marking plate indicates the
specific generator phase sequence.
Counter clockwise rotation
viewed from the stator
connection (NEMA)
(Clockwise rotation viewed
from the shaft drive end
following IEC)
Clockwise rotation viewed
from the stator connection
(NEMA)
(Counter clockwise
rotation viewed from the
shaft drive end following
IEC)
The cables are marked:
U1, V1, W1.
The terminals are marked:
T3, T2, T1
The cables are marked:
U1, V1, W1.
The terminals are marked:
T3, T2, T1
The installer connects the
following:
L1 --> (U1) T3
L2 --> (V1) T2
L3 --> (W1) T1
The installer connects the
following:
L3 --> (U1) T3
L2 --> (V1) T2
L1 --> (W1) T1
3.4.2 Insulation distances
Products not delivered by Leroy-Somer and then installed
in the terminal box must meet the electrical insulating
distances.
This applies to power cables and lugs, and to added
transformers, etc.
Nominal Voltage 500 V 1 KV 2 KV 3 KV
Phase-Phase in
the air (mm)
25 30 40 60
Phase-Earth in the
air (mm)
25 30 40 60
Phase-Phase
Creeping (mm)
25 30 40 70
Phase-Earth
Creeping (mm)
25 30 40 70
Nominal Voltage 5 KV 7.5KV
12.5KV
15 KV
Phase-Phase in
the air (mm)
120 180 190 190
Phase-Earth in the
air (mm)
90 120 125 125
Phase-Phase
Creeping (mm)
120 180 190 190
Phase-Earth
Creeping (mm)
120 180 190 190
3.4.3 Added products in the terminal box
This may apply to site added customer CTs; VTs etc.
Leroy-Somer must be informed if some appliances have to
be installed in the generator terminal box.
The products not delivered by Leroy-Somer and then
installed in the terminal box must meet the electrical
insulating distances. Refer to chapter 3.4.2.
The installed appliances must be able to withstand
vibration.
T6
T5
T4
T3
T2
T1
L1
L2
L3
U1
V1
W1
T6
T5
T4
T3
T2
T1
L3
L2
L1
U1
V1
W1

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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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15
4. START-UP
4.1 ELECTRICAL START-UP INSPECTION
4.1.0 General information
Electrical connections (auxiliaries, safety and power lines)
must comply with the drawings provided.
Refer to Section 5 to get the concerned schematics.
DANGER:
Check that all safety equipment operates correctly.
4.1.1 Insulation of the winding
Isolation and polarisation index must be measured at start-
up and then as recommended in Chapter 5.1.0.
To measure the insulation (refer to chapter 5.10).
4.1.2 Electrical connections
The phases must be connected directly to the bars of the
machine (without spacers or washers, etc.).
Make sure that the lugs are sufficiently tightened.
CAUTION:
ALL CURRENT TRANSFORMERS MUST BE
CONNECTED BEFORE STARTING. IF A CURRENT
TRANSFORMER IS NOT USED, ITS OUTPUT MUST BE
SHORTED.
4.1.3 Parallel operation
4.1.3.1 Definition of parallel operation
• Between machines
Operation mode named by Leroy-Somer "1F".
At least two alternators are connected in parallel to supply
a load.
The automatic voltage regulator is in voltage regulation
mode.
A droop current transformer is necessary to share the
reactive load.
• With the mains
Operation mode named by Leroy-Somer "3F".
At least one alternator is connected in parallel with the
mains (Public electricity network).
The Automatic Voltage Regulator is in Power Factor
regulation mode.
4.1.3.2 Possibility of parallel operation
CAUTION:
PARALLEL OPERATION CAN ONLY BE USED FOR
ALTERNATOR ENGINEERED FOR SUCH OPERATION.
4.1.3.3 Parallel coupling
CAUTION:
A WRONG SYNCHRONIZATION CAN LEAD TO
SERIOUS DAMAGE(HIGH MECHANICAL
OVERTORQUE AND OVER CURRENT).
During synchronization the following values must not be
exceeded:
Max frequency shift: 0.1 Hz
Max phase offset: 10° (electrical angle)
Max voltage (phase - neutral) between machines:
(at phase offset =0) 5 % of the nominal
voltage
Leroy-Somer will not be considered as liable for any
damage in case of incorrect synchronisation, or mains
micro-interruption inducing a fault over the indicated limits.
4.2 MECHANICAL START-UP INSPECTION
4.2.0 General information
4.2.0.1 Alignment; attachment; drive motor
The installation must comply with the drive motor
manufacturer’s installation requirements (alignment,
mounting).
An arrow at the drive end, end shield, indicates the
direction of rotation.
4.2.0.2 Cooling
The air inlet and outlet must not be obstructed.
The cooling auxiliaries (water circulation in the cooler, etc)
must be operating.
4.2.0.3 Lubrication
Lubrication must be carried out in accordance with Chapter
5. Lubricant quantity and periodicity as per Section 1.
4.2.1 Starting roller-bearing machines
The bearings are pre-lubricated in the factory, but it is
necessary to re-lubricate them before they are put into
service in order to fill any gaps in the lubrication circuit and
to remove the storage grease.
CAUTION:
WHEN STARTING UP, LUBRICATE THE MACHINE
WITH THE AMOUNT OF GREASE INDICATED ON THE
NAMEPLATE WHILE IT IS IN OPERATION.
Record the temperature of the bearings during the initial
operating hours. Poor lubrication can cause abnormal
heating.
If the bearing hisses, lubricate it immediately. Some
bearings may make a clattering noise if they do not operate
at normal temperature. This may occur if the weather is
very cold or when the machine is operating under abnormal
temperature conditions (start-up phase, for example). The
bearings will become quieter after having reached their
normal operating temperature.

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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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4.2.2 Terminal Box start-up
The terminal box is mounted on damper pads.
CAUTION:
BEFORE THE ALTERNATOR STARTS, ALL FOUR
BLOCKING SYSTEMS FOR TRANSPORT MUST BE
DISASSEMBLED.
CAUTION:
THE BLOCKING SYSTEMS FOR THE TRANSPORT OF
THE TERMINAL BOX MUST BE INSTALLED EACH
TIME THE ALTERNATOR IS TRANSPORTED (ALONE
OR WITH ITS MOTOR).
The four locking brackets (each fastened by 4 M10 screws;
red parts in the diagram above) must be removed and kept.
4.2.3 Vibrations
The vibration measurement must be taken on each bearing
in all three directions. The measured levels must be lower
than the specified values indicated in the chapter 2.1.3.4.
Adjust the sensor as per chapter 2.1.3.4.
4.3 START-UP SEQUENCES
Start-up (commissioning) of the generator must follow the
following sequences:
4.3.1 Machine stopped checks
Mounting of the machine as per chapter 4.2.
Alignment as per chapter 3.3.
Cooling as per Chapter 4.2.0.2 & 4.2.3.
Lubrication of bearings as per Chapter 4.2.2.
Electrical connections as per chapter 4.1.2.
Winding insulation as per chapter 5.10.
4.3.2. Machine running checks
4.3.2.0 Rotor speed ramp-up (Standard Machine)
There are no restrictions on the rate of rotor speed
increase between stop and rated speed.
There is no restriction regarding the rate of load
application.
4.3.2.1 Checks of machine running without excitation
Run the generator without excitation by steps to verify the
bearings temperature as per chapter 2.5.1 or 2.6.2.
At the nominal speed (not excited) measure the vibrations.
Check that the vibration level is in accordance with the use
of the generator (as per chapter 2.1.3.4).
4.3.2.2 Checks of excited machine running with no load
In manual AVR voltage regulation mode, check the
excitation current value (refer to Section 4 for more
information on manual AVR mode and to Section 2 for the
generator test report).
In AVR automatic mode; Voltage adjustments; Voltage
range; check the excitation current value (refer to Section 4
for the AVR manual and to Section 2 for the generator test
report).
At the nominal speed (excited) measure the vibrations.
Check that the vibration level is in accordance with the use
of the generator (as per chapter 2.1.3.4).
4.3.2.3 Generator and site safety parameter
Adjust the site safety systems (surge voltage relay, surge
current relay, residual current protection, negative
sequence relay, etc.) The setting points are not in the
Leroy-Somer scope of supply.
The settings must comply with the generator data sheet
(e.g. capacity curve; thermal damage curve, etc.).
Check the synchronizer setting as per chapter 4.1.3.3.
For any operation at a speed exceeding the nominal range
(generally the main frequency +3%) the generator
excitation must be shut off (refer to the electrical
schematics).
4.3.2.4 Checks of machine running under full load
checks
Grid-coupled operation.
Adjust the Power Factor.
Progressively apply load to the generator:
Check the excitation current at 25% of the rated load.
Check the excitation current at 100% of the rated load.
At the nominal speed (full load) measure the vibrations.
Check that the vibration level is in accordance with the use
of the generator (as per chapter 2.1.3.4).

Electric Power Generation
Installation and maintenance
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LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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17
4.3.3 Generator start-up checklist
TYPE SERIAL No.
Voltage VFrequency Hz Speed rpm
Output Power kVA Power Factor
STATIC CHECKS
Mechanical checks
•Direction of Rotation (refer to Section1)Clockwise or Anti-clockwise
•Mechanical fastening of the generator (see Chapter 4.2) ____________________________________________
•Coupling - Alignment with the motor (refer to chapter 3.3)_______________________________________
•Cooling: Coolant flow rate (see section 1; Chapters 4.2.0.2 & 4.2.3) _____________________________________
•Open air inlet and outlet _____________________________________________________________
•Bearing lubrication: Lubrication of plain bearings (flow rate; level; oil) (Section 1 & Chapter 4.2.2)___________
Or Roller bearings lubrication (refer to Section1 & chapter 4.2.1)
Temperature sensors (correct readings) (Section 1& Chapters 2.5.1 & 2.6.2) ____________
•Heating by additional resistance heaters (see section 1) ____________________________________________
Type of AVR : 1F 3F
Electrical connections between alternator, AVR and main panel: (refer to Section 4 & drawing Section 5)
•Output power cable connections in phase order (see Chapter 3.4.1) _
•Terminal box connections ________________________________________
•AVR detection voltage ________________________________________
•Supply power and excitation terminals ________________________________________
•Network detection (3F only) ________________________________________
•Command signals (equalisation and synchronisation for 3F) ________________________________
•Excitation polarity and booster ________________________________________
•Protective devices: (Bearing oil level fault detectors; Temperature sensors, etc) ______________________
•External accessories (e.g. remote potentiometer) ________________________________________
ALL CURRENT TRANSFORMERS MUST BE CONNECTED.
Windings insulation
Winding temp.:…….°C
Voltage
1 minute
(MΩ)
10 minutes
(MΩ)
Polarisation
index
Static parts
3 Phases / Ground
"U" /Ground
"V" /Ground
"W" /Ground
"U" / "V"
"U" / "W"
"V"/"W"
Exciter field / Ground
If the 3 phases/earth IR measurement is compliant then the rest of the measurements are not required for a Commissioning
Rotating
parts
Rotor / Ground
≤ 500 V
Exciter armature / Ground
≤ 500 V
Rotating resistances
≤ 500 V
Rotating diodes
≤ 500 V
All works must be carried out by a qualified and authorised person.

Electric Power Generation
Installation and maintenance
5382 en - 2022.11 / h
LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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18
RUNNING CHECKS
WITH EXCITATION - AT NO LOAD CONDITIONS
•Verification of the temperature of the bearings (refer to chapter 2.5.1 or 2.6.2)°C_____________
•In manual mode: Voltage setting ___________________________________
Excitation current check ___________________________________
•In automatic mode: Voltage Setting (referring to nominal voltage) ________________________
Excitation current check ________________________
•Parallel coupling: Adjustment for parallel operation (3F) ___________________________________
FAULTY SYNCHRONISATION CAN LEAD TO DAMAGE (HIGH MECHANICAL OVER-TORQUE)
•Maximum acceptable values for synchronisation with the mains:
Maximum frequency shift 0.1 Hz _________________________
Maximum Phase offset 10 ° _________________________
Maximum voltage (P.N.) difference 5% of Un _________________________
Control / Adjustment of the site safety parameters
•Over-voltage _____________________________________________________________
•Over-current (by short-circuit on stator in separate excitation mode) _________________________
•Negative sequence relay _____________________________________________________________
•Over-speed _____________________________________________________________
•Differential protection (in static conditions) _____________________________________
•Other protective device _____________________________________________________________
CHECK THAT ALL SAFETY EQUIPMENT OPERATES CORRECTLY.
WITH EXCITATION - LOADED
Take the load gradually from 0 to 100% in steps of 25%.
Record for each step (refer to Section 1):
•Electrical output (KW)
•POWER FACTOR
•Voltage (V)
•Current (A)
•Excitation Current / voltage
•Winding temperature
Time
KW
pf
Volts
I (A)
I (ex)
U1 (°C)
V1 (°C)
W1 (°C)
•Temperature of the bearings (if thrust sensor available, please record its value)
Time
DE Thrust (°C)
DE Radial (°C)
NDE Radial (°C)
•Oil inlet temperature (if applicable; refer to Section 1)
•Oil flows (if applicable; refer to Section 1)
•Vibrations of the bearings (mm/s) (refer to chapter 2.1.3.4)
DE-V
DE-H
DE-A
DE-V
DE-H
DE-A
All maintenance must be carried out by a qualified and authorised person.

Electric Power Generation
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5382 en - 2022.11 / h
LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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19
5. MAINTENANCE AND SERVICING
5.0 GENERAL INFORMATION
DANGER:
BEFORE ANY WORK ON THE GENERATOR, MAKE
SURE THAT THE START-UP CANNOT BE ACTIVATED
BY ANY MANUAL OR AUTOMATIC SIGNAL.
CHECK THAT ALL LOCKS ARE ENGAGED AND
FOLLOW THE SITE SAFETY PROCEDURES.
DANGER:
Before working on the machine, make sure that you
have understood the operating principles of the
system. If necessary, refer to the appropriate chapters
in this manual.
To obtain additional information on the maintenance of
sub-assemblies, refer to the chapters dealing with the sub-
assemblies concerned.
When a defective part is replaced with a spare part, make
sure that it is in good condition.
For any electrical work use electrical schematics for
assistance.
The whole machine must be kept clean.
CAUTION:
ANY OF THE CLEANING PERIODS INDICATED IN THIS
MANUAL MAY BE CHANGED (INCREASED OR
DECREASED) DEPENDING ON SITE CONDITIONS.
The air inlet and air outlet surfaces must be kept clean
(louvers can be cleaned like for the filters). Refer to
chapter 5.5.1.
CAUTION:
DIRT ENTERING THE MACHINE MAY POLLUTE AND
THUS REDUCE THE ELECTRICAL INSULATION.
CAUTION:
ANY PRODUCT (SEALANT, CLEANING PRODUCT,
ETC.) USED DURING MAINTENANCE OR CLEANING
MUST COMPLY WITH LOCAL REGULATIONS AND
ENVIRONMENTAL STANDARDS.

Electric Power Generation
Installation and maintenance
5382 en - 2022.11 / h
LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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5.1 PREVENTIVE MAINTENANCE PROGRAMME
5.1.0 General information
The purpose of the general preventive maintenance programme below is to assist in establishing the installation-specific
maintenance programme. Suggestions and recommendations should be followed as closely as possible to keep the machine
efficient so as not reduce its service-life.
The maintenance operations are detailed in the chapters dedicated to the topics concerned.
The time required for the operations is indicated for information purposes only.
Hours
Comments
Task duration
Major overhaul 40000 Or 5-7 years depending on on-site conditions 4 weeks
5.1.1 Stator
Hours
Comments
Task duration
Winding temperature 24 Daily operation, (without generator set). Refer to chapter
2.1.3.2
Insulation
8000
(*1) Refer to 5.8
4 hrs
Polarisation index 8000 (*1) Refer to chapter 5.8.2
Bolt tightening 8000 (*1) Refer to chapter 5.6 2 hrs
Winding visual inspection 8000 (*1) Refer to 5.8 1 hr
Stator RTD function 8000 (*1) Refer to 2.1.3.2
Cleaning air inlet and outlet 1000 (*1) Refer to chapter 5.5
(*1): or once a year, whichever comes first
5.1.2 Rotor
Insulation 8000 (*1) Refer to 5.8 0.5 hr
Polarisation index 8000 (*1) Refer to chapter 5.8.2
Winding visual inspection 8000 (*1) Refer to 5.8
Cleaning diodes 8000 (*1) Refer to chapter 5.9
0.5 hrDiodes and varistor check 8000 (*1) Refer to chapter 5.9
Diode tightening 8000 (*1) Refer to chapter 5.6.4
(*1): or once a year, whichever comes first
5.1.3 Terminal box
Cleaning 8000 (*1) 0.5 hr
Regulator assembly & supports 8000 (*1) Applicable if mounted in the terminal box
Bolt tightening
8000
(*1) Refer to chapter 5.6.3
1.5 hrs