Nidec Leroy-Somer LSA 180 A Instruction Manual

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High Frequency Alternators
Installation and maintenance
400Hz

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2023.07 / a
Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
This manual concerns the alternator which you have just purchased.
We wish to draw your attention to the contents of this maintenance manual.
SAFETY MEASURES
Before using your machine for the rst 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
qualied technician.
Our technical support service will be pleased
to provide any additional information you
may require.
The various operations described in this
manual are accompanied by
recommendations or symbols to alert the
user to potential risks of accidents. It is vital
that you understand and take notice of the
following warning symbols.
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.
SAFETY INSTRUCTIONS
We wish to draw your attention to the
following 2 safety measures which must be
complied with:
a) During operation, do not allow anyone
to stand in front of the air outlet guards,
in case anything is ejected from them.
WARNING
b) Do not allow children younger than 14
to go near the air outlet guards.
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.
WARNING
The alternators must not be put into
service until the machines in which they
are to be incorporated have been
declared compliant with EC Directives
plus any other directives that may be
applicable.
This manual is to be given to the end
user.
The range of electric alternators and
their derivatives, manufactured by us or
on our behalf, comply with the technical
requirements of the customs Union
directives.
The alternator is a sub-assembly
delivered without a system of protection
against short-circuits. The protection
must be provided by the circuit-breaker
of the generator, sized to interrupt the
fault current.
© 2023 Moteurs Leroy-Somer SAS
Share Capital: 32,239,235 €, RCS Angoulême
338 567 258.
We reserve the right to modify the characteristics
of this product at any time in order to incorporate
the latest technological developments. The
information contained in this document may
therefore be changed without notice.
This document may not be reproduced in any
form without prior authorization.
All brands and models have been registered and
patents applied for.

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Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
CONTENTS
1 - RECEIPT.............................................4
1.1 - Standards and safety measures ........ 4
1.2 - Inspection........................................... 4
1.3 - Storage .............................................. 4
1.4 - Applications........................................ 4
1.5 - Usage restrictions .............................. 4
1.6 - How to read a machine number......... 4
1.7 - Identication....................................... 4
2 - TECHNICAL CHARACTERISTICS ....5
2.1 - Electrical characteristics .................... 5
2.2 - Mechanical characteristics................. 5
2.3 - Schematic diagram ............................ 5
3 - OPERATING PERFORMANCE ..........6
3.1 - Voltage accuracy and response time.. 6
3.2 - Voltage adjustment ............................ 6
3.3 - Stability adjustment............................ 6
3.4 - Overload ............................................ 6
3.5 - Short circuit........................................ 6
4 - AUTOMATIC VOLTAGE
REGULATOR ......................................6
5 - INSTALLATION AND
COMMISSIONING....................................7
5.1 - Delivery and storage.......................... 7
5.2 - Location ............................................. 7
5.3 - Foundation......................................... 7
5.4 - Installation.......................................... 7
5.5 - Alignment ........................................... 8
5.6 - Direction of rotation............................ 8
5.7 - Terminations and switchgear ............. 8
6 - ASSEMBLY OF ALTERNATOR TO
PRIME MOVER...................................8
6.1 - Foundation......................................... 8
6.2 - Alternator mounting single bearing .... 8
6.3 - Alternator mounting double bearing ... 8
7 - ELECTRICAL CHECKS .....................9
7.1 - Insulation checks ............................... 9
7.2 - Connection checks............................. 9
7.3 - Setting up......................................... 10
7.4 - Residual voltage checks .................. 10
7.5 - Rated voltage and balanced voltage
checks...................................................... 10
7.6 - Connection diagram with D550
digital AVR................................................ 11
8 - SERVICING - MAINTENANCE.........12
8.1 - Safety measures.............................. 12
8.2 - Routine maintenance....................... 12
8.3 - Bearings........................................... 13
8.4 - Mechanical faults ............................. 13
8.5 - Electrical faults................................. 14
8.6 - Dismantling and assembly............... 16
8.7 - Rotating rectier assembly............... 17
8.8 - Table of characteristics .................... 17
9 - SPARE PARTS .................................18
9.1 - Recommended spares..................... 18
9.2 - Technical support service................. 18
9.3 - Exploded view, parts list and
tightening torque ..................................... 19
Disposal and recycling instructions

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Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
1 - RECEIPT
1.1 - Standards and safety
measures
Our alternators comply with most
international standards.
1.2 - Inspection
On receipt of your alternator, check that it
has not su󰀨ered 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 - Storage
Prior to commissioning, machines should
be stored: away from humidity (< 90%); after
a long period of storage, check the machine
insulation. To prevent the bearings from
becoming marked, do not store in an
environment with signicant vibration.
1.4 - Applications
This alternator is mainly designed to produce
electricity in the context of applications
involving the use of generators.
1.5 - Usage restrictions
Use of the machine is restricted to operating
conditions (environment, speed, voltage,
power, etc) compatible with the characteri-
stics indicated on the nameplate.
1.6 - How to read a machine number
It is extremely important to properly identify the machine when requesting parts or service.
Always have the alternator model number and serial number when requesting information
from the factory. We cannot help you witout this information.
For example machine no:TGS3L23A 40436-HF
TG S 3 L 2 3 A 4 0 4 3 6 HF
FRAME SIZE
S-SINGLE/
D-DOUBLE
BEARING
3/1 PHASE HIGH
FREQUENCY
YEAR SERIAL NUMBERRATING MONTH
1.7 - Identication
The alternator is identied by means of a nameplate xed on the machine. Make sure that the
nameplate on the machine conforms to your order. So that you can identify your alternator
quickly and accurately, we suggest you ll in its specications on the nameplate below.

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Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
2 - TECHNICAL
CHARACTERISTICS
2.1 - Electrical characteristics
All standard products have 2/3 pitch main
windings to eliminate the third harmonic.
This serves to lower operating tempera-
tures, give lower harmonic content and
better waveform, and extend the overall life
of the alternator.
2.2 - Mechanical characteristics
- Degree of protection: IP23
- Type of mounting: single-bearing IM2005
and two-bearing IM2001
- Other types of protection and mounting
can also be o󰀨ered on request
2.3 - Schematic diagram
- Here the excitation power is derived from
the main output winding.
Referring to the schema below, initially the
machine builds up voltage with the help of
residual magnetism.
- The automatic voltage regulator (AVR) will
sense this low voltage and compare it with
the set reference voltage level and provides
such power as is available from the main
stator winding in order to establish the
exciter eld.
- The power from the main output winding is
rectied in the AVR and added to residual
voltage level of exciter to produce a greater
magnetic eld strength. This in turn
increases output voltage from the exciter
rotor and so on.
- The output from the exciter rotor is rectied
by the rotating diodes which adds to the eld
strength and increase the output voltage
from the main stator.
- The AVR senses this increases, compares
it with the set reference and uses the
increased power from the main stator to
further increase the exciter eld excitation
as required. ln this way the main stator
voltage is progressively built up until the
sensed voltage is the same as the set
reference voltage.
U V W N
Main Stator Exciter
Stator
Exciter
Stator
Exciter
Rotor
(Armature)
A.V.R.
OUTPUT
ROTATING RECTIFIER
ASSEMBLY
TO LOAD
Main Field (Rotor)
Main Stator

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Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
3 - OPERATING PERFORMANCE
3.1 - Voltage accuracy and response
time
The steady state voltage accuracy will be
±0.8% at 0.8 to unity p.f (lag) from no load to
full load and this is independent of the
temperature, voltage, load and power factor
within the limits specied. The voltage
regulator will keep the alternator voltage
constant without undue overheating of its
component and under consideration of
speed drop to the extent of 4 % of rated
speed. The response time of regulation is
less than 75 milliseconds.
3.2 - Voltage adjustment
A potentiometer is provided in the AVR for
voltage adjustment up to ±5% of rated
voltage. Provision is made for connecting
external potentiometer in the AVR for any
remote adjustment.
Refer to the AVR manual ref. 5744 for
details.
3.3 - Stability adjustment
A potentiometer is provided to reduce the
voltage hunting under no-load condition.
Procedure to set STAB pot is as follows:
refer to the AVR manual ref. 5744 for details.
3.4 - Overload
The 400Hz alternators are designed to
withstand 10 % overload for one hour in
every 12 hours of rated load operation and
50% over load for 30 seconds as specied
in relevant standards.
3.5 - Short circuit
The alternators are designed to withstand
the short circuit current of three times the
rated current for three seconds. The exciter
is liberally designed to cater ta the excitation
requirement under such conditions.
4 - AUTOMATIC VOLTAGE
REGULATOR
The D550 is a digital automatic voltage
regulator (AVR) for alternators with rated
eld current up to 7 A.
It o󰀨ers a vast array of regulation modes
suitable for all power generation
applications, including grid-connected
congurations.
The D550 also integrates a visual interface
through the EasyReg Advanced software,
which allows the user to read the
conguration values and parameters. It
can also be congured directly via USB
without external power supply.
The D550 also includes several protections
and functions to keep the alternator
running in full safe operation.
The communication port is CANJ1939
compatible.
• Regulation modes:
- Voltage
- Field current (manual mode)
- Generator power factor
- Grid power factor
- Generator kVAr
• Regulation features:
- Voltage equalization
- Droop management
- Cross current compensation
- Soft start
- Load Acceptance Module (L.A.M.) func-
tion to assist during heavy load application
events
- Negative eld forcing
• kW, kVAr, kVA & PF calculation
• Protections & Limitations:
- Under and over eld current limitation
- Loss of eld sensing
- Generator under/over voltage
- Loss of sensing
- V /Hz regulation mode

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Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
5 - INSTALLATION AND
COMMISSIONING
Personnel undertaking the various
operations indicated in this section must
wear personal protective equipment
appropriate for mechanical and electrical
hazards.
5.1 - Delivery and storage
Upon receipt of the alternator, it is
recommended that it should be carefully
examined for possible damage in shipment.
The alternator was given to the Freight
Company in good condition, and they are
responsible for the product from our dock to
yours. Any damage should be noted on the
freight bill before accepting the shipment.
Claims for damages must be promptly led
with the Freight Company.
WARNING
The alternator must be stored in a clean
and dry place to avoid entry of moisture
and the harmful dusts as otherwise the
insulation resistance of the windings will
get a󰀨ected. In order to prevent
compression pits in the bearings, the
alterntor should be stored in vibration
free premises.
5.2 - Location
- The alternator shall be installed where
there is su󰀩cient circulation of fresh-air. i.e.
ambient temperature never exceeds 40°C
for the normal rating.
- For higher temperature, a deration factor
should be applied.
- Further the room must be dry and the
machine must be easily accessible.
- Vibration of the alternator should be with in
values specied in IEC60034. If vibration is
more, then the levels of the alternator feet
should be checked with the help of dial
indicator and corrected.
- Care should be taken exhaust of diesel
engine does not get mixed with the air inlet
of the alternator.
5.3 - Foundation
For mounting the alternator with the prime
mover, it will be necessary to mount the
alternator on a bedplate or base frame but
not directly over the cast foundation.
The holes that take up the foundation or
anchor bolts must be grouted with concrete
of a composition equal to that of the
foundation itself.
The nuts of the bolts shall be tightened only
after the concrete has properly cured.
5.4 - Installation
WARNING
All mechanical handling operations
must be undertaken using suitable
equipment and the machine must be
horizontal. Check how much the machine
weighs before choosing the lifting tool.
During this operation, do not allow
anyone to stand under the load.
The machine can only be started up and
used if the installation is in accordance
with the regulations and instructions
dened in this manual.
Make sure that the air inlet and outlet
openings are clear without any
obstruction.
The alternators are intended for
horizontal mounting and direct drive
through exible coupling in case of
double bearing machine and with
coupling disc in single bearing machine;
the tapped holes provided in the shaft
end/hub can be used for tting coupling.
CRANE CRANE
GROUND LEVEL

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Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
5.5 - Alignment
Measuring the concentricity and parallelism
of the coupling shall carefully align the
alternator and the prime mover.
The di󰀨erence between the two coupling
haIves shall not exceed 0.1 mm.
5.6 - Direction of rotation
The alternator can be driven in either
direction of rotation. For the standard phase
sequence U-V-W, the rotation is clockwise
looking from the drive end of the alternator,
for anticlockwise rotation; transpose phases
V and W to get U-W-V phase sequence.
5.7 - Terminations and switchgear
Standard termination consists of four
terminals, three-phase and a neutral.
Correct size of cable glands should be
chosen. The switchgear should include all
those required for the operation of the
alternator and the same is not in the scope
of supply of alternator manufacturer as
such. Adequate protection system has to be
provided to protect and to isolate the
alternator during any malfunction.
For the optimum performance, the current in
the three lines should be equal. However
unbalance of up to 25% may be allowed for
short period without exceeding the rated
current. Voltage regulation and other
performance characteristics are not
guaranteed for unbalance and non-linear
loads.
6 - ASSEMBLY OF ALTERNATOR
TO PRIME MOVER
6.1 - Foundation
The machine should be mounted on a
foundation / base frame, which may be of
steel structure or concrete platform.
The foundation / base frame must be well
designed for adequate rigidity and long life,
taking into consideration the dynamic
loading under abnormal running of the
machine, vibration resulting from running
machinery and other relevant factors.
Care must be taken to ensure that the
surface to which the machine is bolted down
is aligned and leveled in all directions prior
to mounting the machine.
6.2 - Alternator mounting single
bearing
Single bearing alternators are provided with
an SAE ywheel adapter and exible drive/
discs. Very close tolerances are maintained
in the manufacture of the alternator so that
the alignment procedure is extremely
simple. A coupling hub is shrunk on the shaft
and special steel drive discs are bolted to
the hub. Holes are provided in the periphery
of the coupling disc, which correspond to
tapped holes in the ywheel. The outside
diameter of the discs ts in a rabbet in the
ywheel so that concentricity is ensured in
all cases. Ensure endplay available.
The SAE adapter and the ywheel housing
are designed to match each other with no
further alignment necessary. Shims may be
necessary under the feet of the alternator to
ensure a solid mounting.
WARNING
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 ywheel holes by
cranking the engine.
Make sure the machine is securely
bedded in position during coupling.
6.3 - Alternator mounting double
bearing
Two bearing alternators are provided with a
shaft extension and key way. For direct
coupled sets the assembler furnishes a
exible coupling which is installed between
the driver and the alternator shaft.
WARNING
Aligning the two machines as accurately
as possible will reduce vibration,
increase-bearing life, and ensures
minimum coupling wear. lt may be
necessary to shim the alternator feet for
proper support and alignment.
Consult us for alignment specications
and procedures.

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Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
7 - ELECTRICAL CHECKS
WARNING
Ensure that the alternator has the degree
of protection matching the dened
environmental conditions.
7.1 - Insulation checks
If the machine is stored for long period or is
suspected to be damp, the insulation
resistanceof the winding shouldbechecked.
While checking the insulation resistance of
the winding it must be ensured that all the
connections to the AVR and rotating rectier
assembly are removed.
The insulation resistances of all windings
are to be checked using a 500V megger
before the alternator is put into operation.
The insulation resistance of the winding
and earth should be greater than 2 Mega
ohm. If the resistance is less than this value,
connect 230V, single phase supply to space
heater terminals provided inside the
terminal box for 1 or 2 hours. Again recheck
for IR value.
Alternative methods to improve IR Value
are as follows:
- Disconnect the AVR from the terminals,
short circuit the three stator output terminals
through a cable capable of carrying the
rated current and also provide an ammeter
to monitor the current owing in the short
circuit terminals. Connect a 24V battery to
the eld winding (F1 & F2) terminals of the
exciter stator with respect to the polarities in
series with a rheostat of about 10 ohms and
250W.
- Run the alternator to its rated speed and
adjust its excitation through the rheostat in
order to obtain the rated current in the short-
circuited terminals. After getting heated up
stop the prime mover, disconnect the exciter
eld connection from the 24 V battery and
again measure the insulation resistance
value.
Another method of improving IR value of
winding is to circulate the hot air through the
machine.
Placing heaters inside or near the machine
may do it. Care should be taken to see that
temperature of no part of the winding
exceeds 90°C (194°F) total temperature by
thermometer.
7.2 - Connection checks
Most of the problems that arise during
operation are due to wrong, loose or
snapped connections from AVR/ switchgear
to the machine. Hence, it is important to
check these connections thoroughly.
The connection between AVR and the
alternator terminal should be checked as
per the connection diagram.
Any intervention on the alternator
terminals during reconnection or checks
should be performed with the machine
stopped. In no case should the internal
connections in the terminal box be
subjected to stresses due to cables
connected by the user.
WARNING
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.

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Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
- 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
circuitbreakers or relays in the cabinet).
- The machine should be connected with the
busbar separating the terminals as shown in
the terminal connection diagram.
- The alternator earth terminal inside the
terminal box is connected to the electrical
earth circuit
- The earth terminal is connected to the
frame.
The connections inside the terminal box
must never be subjected to stress due to
cables connected by the user.
Diameter M6 M8 M10 M12
Torque 4 Nm 10 Nm 20 Nm 35 Nm
Tolerance ± 15%
7.3 - Setting up
The various adjustments during tests
must be made by a qualied engineer.
Ensure that the drive speed specied on
the nameplate is reached before
commencing adjustment.
After operational testing, replace all
access panels or covers.
TheAVR isused to makeany adjustments
to the machine.
7.4 - Residual voltage checks
The minimum residual voltage at the
alternator terminals required for positive
buildup is about 2.5V between line to
neutral with the alternator running at rated
speed.
If the machine does not build up due to low
or loss of residual magnetism, the following
procedure is applied to recharge the
alternator:
- Stop the engine and disconnect the AVR
connections.
- Flash the exciter eld by connecting
12/24V battery with F1 connected to
positive and F2 to negative terminal of the
battery for 10 - 15 seconds.
Failures to build up voltage (see section
8.5).
Do not megger or ash test the alternator
windings unless all leads to the AVR
have been disconnected.
7.5 - Rated voltage and balanced
voltage checks
The alternator is started and run at its rated
speed. Whenever ma nuai contrai of voltage
is provided as a feature, the alternator
should be excited on no load manually, till
the rated voltage is developed between line
to line. The voltage balance on the three
lines of the alternator should be checked.
Do not start the alternator with load on.
Removal of pot sealing in AVR warranty
void.

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Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
7.6 - Connection diagram with D550 digital AVR
• SHUNT three-phase
STATOR
ROTOR
RT01
U
F1
F2
U V W N
W
V
D550
X2
Z1
X1
Z2
L1 L2
S2S1S2S1S2S1
U
UVW
V
W
F+
F-
Bat+
DI01 DI02 DI03 DI04
0V
DI05 DI06
0V
DI07 DI08
0V
Bat-
EXCITER
STATOR
EXCITER
ARMATURE
EXCITER FIELD
3-PHASE
BRIDGE RECTIFIER
MAIN FIELD
MAIN STATOR WINDING
OUTPUT
TERMINALS
TO LOAD

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Electric Power Generation Installation and maintenance
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High Frequency Alternators
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8 - SERVICING - MAINTENANCE
8.1 - 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, who must
wear personal protective equipment
appropriate for mechanical and electrical
hazards.
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.
Warning : During and after running, the
alternator will reach temperatures hot
enough to cause injury, such as burns.
8.2 - Routine maintenance
• Checks after start-up
After approximately 20 hours of operation,
check that all xing bolts on the machine are
still tight, plus the general state of the
machine and the various electrical
connections in the installation.
• Electrical servicing
Commercially-available volatile degreasing
agents can be used.
WARNING
Do not use: trichlorethylene, perchlo-
rethylene, trichloroethane or any alkaline
products.
These operations must be performed at a
cleaning station, equipped with a
vacuum system that collects and ushes
out the products used.
The insulating components and the
impregnation system are not at risk of
damage from solvents. 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.
• Mechanical servicing
WARNING
Cleaning the machine using water or a
highpressure washer is strictly prohi-
bited. 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 the machine is tted with air inlet and outlet
lters, the maintenance personnel should
clean them routinely at regular intervals. In
the case of dry dust, the lter can be cleaned
using compressed air and/or replaced if it is
clogged.
After cleaning the alternator, it is essential to
check the winding insulation (see section
8.5).

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400Hz
High Frequency Alternators
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8.3 - Bearings
The bearings are greased for life Approximate life of the grease (depending on use):
20,000 hours or 3 years
Monitor the temperature rise in the bearings, which should not exceed 90°C above the ambient
temperature. Should this value be exceeded, the alternator must be stopped and checks carried out.
8.4 - Mechanical faults
Fault Cause Rectication
Over heating of
alternator
Alternator overload Check the load and correct.
To be in line with nameplate rating
Blocking of ventilation passage Check ventilation and clean passage if
necessary
Low speed on load Adjust prime mover speed
Low load power factor Reduce the load
Alternator operating at very high voltage Check voltage and adjust
High percentage of
nonlinear load Check and reduce nonlinear load
Excessive vibration
and noise
Poor alignment Realign properly
Coupling and foundation bolts loose Tighten the bolts
Bearing defective Replace bearings
Over heating of
bearing
Incorrect assembly of bearing Reassemble correctly
Bearing damaged Replace bearing

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Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
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8.5 - Electrical faults
Fault Cause Rectication
No voltage from
alternator
Defective voltmeter Check voltmeter and replace
Excitation circuit open Check for loose connection
Incorrect excitation circuit connection Check for proper connection
Low residual voltage
Check for residual voltage.
If residual voltage is less than 2.5 volts (L N),
eld ashing required for few seconds
Field ashing procedure:
- Disconnect regulator connections
- Connect 12/24V battery keeping F1 to
positive and F2 to negative terminal of
exciter stator
Grounded exciter eld Check and correct
Rotating rectier faulty Check rotating diodes
Fuses in AVR failed Replace fuses
AVR defective Replace AVR
Voltage developed
but excitation
current is high
Rotating diode faulty Check rotating diodes and replace faulty
diodes
Prime mover Adjust prime mover
Prime mover speed is low Adjust prime mover speed to rated speed
Low voltage build
up
V Trim Pot incorrectly set Adjust voltage by V Trim Pot in AVR
Low prime mover speed Adjust prime mover speed to rated speed
Voltage - High
Loose or no connection to U terminals of the
AVR Check and correct
Incorrect voltage setting Adjust voltage by V Trim Pot in AVR
AVR defective Replace AVR
Voltage uctuation
Speed uctuation of the prime mover Set the speed of the prime mover
Incorrect setting of stability Pot Adjust stability Pot in AVR
Leading load power factor Correct the power factor
Load hunting, uctuates rapidly Check and reduce the non linear load
High percentage of non linear load Rectication

15
2023.07 / a
Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
• Checking the winding
You can check the winding insulation by
performing a high voltage test. In this case,
you must disconnect all AVR wires.
WARNING
Damage caused to the AVR in such
conditions is not covered by our
warranty.
• Checking the diode bridge
A diode in good working order should allow
the current to ow only in the anode-to-
cathode direction.
C
A
- -
+ +
~ ~ ~
C C C
A A A
C C C
A A A
~ ~ ~
-
C
A
+
-
C
A
+
Anode Cathode
• 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
eld wires (5+) and (6-).
6 - 5 +
1A diode
12V battery
Rh. 50 -300W
-
+
A
SSEMBLY A
Field
Assembly B: Connect a “Variac” variable
power supply and a diode bridge on both
exciter eld wires (5+) and (6-).
Both these systems should have
characteristics which are compatible with
the eld excitation power of the machine
(see the nameplate).
3) Run the unit at its rated speed.
4) Gradually increase the exciter eld
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 (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).
1A diode
-
+
6 - 5 +
Variac AC
220V
DC
12V
50
60
70
80
90
100
40
30
20
10
0
ASSEMBLY BField

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2023.07 / a
Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
• Rotor removal
- Remove NDE front cover.
- Remove the screws of NDE bearing cap.
- Disconnect exciter stator winding leads
from AVR.
- Unbolt the NDE end shield from the stator
body and jack the NDE end shield with the
help of suitable bolts.
- Take out the rotor towards the DE side
along with the fan and bearing from the
stator body.
- Reassemble the rotor in reverse order.
• Rotating rectier assembly removal
- Disconnect the rotating rectier assembly
connections from main rotor and exciter
rotor.
- Unbolt the rotating rectier assembly from
the exciter rotor with the help of suitable
spanners.
- Withdraw the rotating rectier assembly
towards the NDE side.
- Ret the rotating rectier assembly on
exciter rotor in reverse order.
• Exciter rotor removal
- Remove bearing from the shaft using
suitable bearing puller.
- Remove rotating rectier assembly from
the exciter rotor.
- Fix suitable xture ta studs provided in
exciter rotor.
- Pull out the exciter rotor from the shaft with
suitable puller towards the NDE side.
• Exciter stator removal
- Disconnect the exciter stator winding leads
from AVR.
- Unbolt the NDE shield from the stator body.
- Unbolt the exciter stator core from NDE
shield.
- Ret the exciter stator in reverse order.
NDE end shield removal
Rotating rectier assembly removal
Bearing removal
Exciter rotor removal
8.6 - Dismantling and assembly
WARNING
During the warranty period, this operation should only be carried out in an approved
workshop or in our factory, otherwise the warranty may be invalidated. Whilst being
handled, the machine should remain horizontal (rotor not locked in position). Check how
much the machine weighs before choosing the lifting method.

17
2023.07 / a
Electric Power Generation
1
2
6
7
8
9
3
“B”
Section “BB”
“B”
5
4
Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
8.8 - Table of characteristics
Alternator:16/24/26 poles - 400 Hz. The voltage and current values are given for no-load
operation and operation at rated load with separate eld excitation. All values are given to within
± 10% and may be changed without prior notication (for exact values, consult the test report).
• Average values for the LSA 180/225/280
Resistances at 20 °C (Ω), eld excitation current & weights of the machine
Type L/L stator Rotor Excitation Weight in kg
No load At rated load SB DB
LSA 180 A 0.1150 1.898 0.8 3.5 117 54
LSA 180 B 0.1150 1.898 0.8 3.7 117 54
LSA 180 C 0.1146 1.897 0.9 3.7 117 54
LSA 180 D 0.0408 2.883 0.9 3.8 137 86
LSA 180 E 0.0408 2.883 0.8 3.8 151 110
LSA 180 F 0.0408 2.883 0.9 3.9 165 134
LSA 180 G 0.0274 3.727 0.8 4.0 185 177
LSA 180 H 0.0274 3.730 0.8 4.2 185 177
LSA 180 I 0.0176 4.571 0.9 4.3 200 201
LSA 180 J 0.0176 4.571 1.0 4.5 214 225
LSA 225 A 0.1250 4.480 0.9 4.0 300 330
LSA 225 B 0.0736 5.460 0.9 4.2 310 340
LSA 225 C 0.0432 6.630 0.9 4.0 335 365
LSA 280 A 0.0230 2.700 0.9 4.2 570 600
LSA 280 B 0.0199 2.930 0.9 4.4 725 755
LSA 280 C 0.0168 3.160 0.9 4.7 740 770
LSA 280 D 0.0138 3.400 1.0 4.6 780 790
LSA 280 E 0.0107 3.620 0.9 4.8 800 830
LSA 280 F 0.0076 3.849 1.0 4.8 850 880
8.7 - Rotating rectier assembly
Ref
No Description Qty
1Base plate 1
2Aluminum bar 2
3Forward diode 3
4Reverse diode 3
5Varistor 1
6 Hexagonal bolt 3
7 Hexagonal nut 3
8Plain washer 3
9Lock washer 3

18
2023.07 / a
Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
5.2 - Technical support service
Our technical support service will be
pleased to provide any additional
information you may require.
For all spare parts orders or technical
support requests, send your request to
[e-mail] or your
nearest contact, whom you will nd at
www.lrsm.co/support indicating the comp-
lete type of machine, its number and the
information indicated on the nameplate.
Part numbers should be identied from the
exploded views and their description from
the parts list.
To ensure that our products operate correctly
and safely, we recommend the use of
original manufacturer spare parts.
In the event of failure to comply with this
advice, the manufacturer cannot be held
responsible for any damage.
9 - SPARE PARTS
9.1 - Recommended spares
Description Qty Code
Automatic voltage
regulator (AVR) 1ALT550KC001B
Bearing NDE 1BG1100631010
BG1100631210
Rotating rectier
assembly (RRA) 1 set ESC035MD004B 1RRBF0700200
Wound exciter rotor 11ERLB0400100
1ERLB0500200
Wound exciter stator 11ESLB0400600
1ESLC0500200
Terminal bar 1AG3030570000
AG3040790000
After operational testing, it is essential to
replace all access panels or covers.
9.2 - Technical support service

19
2023.07 / a
Electric Power Generation
20
32
19
23
18
29
30
17
16
15
1
2
10
28
12
11
24 26 25
14 13
21 27 31
22
5
6
7
3
9
8
4
Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
9.3 - Exploded view, parts list and tightening torque

20
2023.07 / a
Electric Power Generation Installation and maintenance
400Hz
High Frequency Alternators
6149 en -
Ref. Qty Description
180 frame 225 frame 280 frame
Screw
Ø
Torque
N.m
Screw
Ø
Torque
N.m
Screw
Ø
Torque
N.m
1 1 Stator assembly - - - - - -
2 1 Rotor assembly - - - - - -
3 1 Fan with key - - - - - -
4 1 Circlip for fan - - - - - -
51Hub with key - - - - - -
6 6 Shim - - - - - -
73Disc coupling M10 50 M12 90 M12 90
8 3 Locking washer - - - - - -
91 Pressure plate - - - - - -
10 1 Fan key - - - - - -
11 1DE adaptor SAE-3 M10 50 M10 50 M12 50
12 1 DE slotted surround SAE-3 M6 10 M6 10 M6 10
13 2 Feet - - - - - -
14 1 Earthing bolt M10 50 M10 50 M10 50
15 1Bearing cap M6 10 M6 10 M6 10
16 1 Bearing - - - - - -
17 1NDE shield M10 50 M10 50 M10 50
18 1 Exciter stator M8 25 M8 25 M8 25
19 1Exciter rotor - - - - - -
20 1 Diode M6 10 M6 10 M6 10
21 1 Terminal box top cover M6 10 M6 10 M6 10
22 1 Gasket - - - - - -
23 1 NDE front cover M8 25 M8 25 M8 25
24 1 Platform - - - - - -
25 1 Terminal bar M8 10 M10 26 M12 46
26 1AVR M6 10 M6 10 M6 10
27 4 Grommet - - - - - -
28 1 Extension key - - - - - -
29 1 O-ring - - - - - -
30 1 Exciter rotor locking plate - - - - - -
31 2 Terminal box with gasket M6 10 M6 10 M6 10
32 1 Varistor M6 10 M6 10 M6 10