Leroy-Somer Nidec LSAP 40 POLE Instruction Manual

TM
Low Voltage Alternators - 4 pole
Installation and Maintenance
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE

1
6 - DISMANTLING, REASSEMBLY
7 - SPARE PARTS
6.1 Tools Required.................................................18
6.2 Screw Tightening Torque................................18
6.3 Accessing, Checking and replacing diodes....18
6.5 Replacing the DE bearing on a two
bearing m/c......................................................19
6.6 Accessing the main field and stator...............19
6.4 Replacing the NDE bearing on a single
bearing m/c......................................................19
7.1 First maintenance parts....................................20
7.2 Description of bearings....................................20
7.3 Product support................................................20
1 - RECEIPT
2 - TECHNICAL CHARACTERISTICS
3 - INSTALLATION
4 - AVR
5 - SERVICING, MAINTENANCE
1.1 Standards and safety measures.................3
Inspection...................................................3
Identification..............................................3
Storage........................................................3
1.2
1.3
1.4
2.1
2.2 Mechanical Characteristics....................4
2.3 Options...................................................4
2.4 Shunt System with R201/R203 AVR......5
Electrical Characteristics........................4
4.1 R-120/121/D120............................................9
4.2 ..........................10
4.3 R201/203.....................................................13
AVR Connection Diagram
3.1
3.2 Inspection prior to first use....................6
3.3 Terminal connection diagrams...............7
3.4 Commissioning........................................9
3.5 Setting up................................................9
Assembly..................................................6
5.1
5.2 Electrical faults..............................................16
5.3 Checking the windings ................................17
5.4 Checking the diode bridge ..........................17
Safety measures............................................15
5.5 Checking the windings and rotating diodes
using separate excitation.............................17
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation
9 - Service Support ...................................................23
10 - Disposal and recycling instructions....................24
11 - Warranty Certificate............................................25
12 - Warranty Clause...................................................26
13 - Ac Generator Registration Form (arf).................27
14 - Service History Card.............................................29
15 - Space Heaters.......................................................30
8 - Exploded view, parts list and tightening
torque
8.1 - KG 40 Single bearing.............................21
8.2 - KG 42.3 Single bearing..........................22

We wish to draw your attention to the contents
of this maintenance manual. By following certain
important points during installation, and servicing
of your AC Generator, you can look forward to
many years of trouble-free operation.
The latest addition to a whole new generation
of AC Generator, this range benefits from the
experience of the leading manufacturer worldwide,
using advanced technology and incorporating
strict quality control.
WARNING SYMBOLS
Locations at which warning symbols shoud be
positioned is shown in the sketch below. User may
install these for safety purposes. (the stickers of
symbols are generally not supplied with the
machine).
SAFETY MEASURES
WARNING
Warning symbol for an operation capable of damaging
or destroying the machine or surrounding equipment.
Warning symbol for general danger to personnel.
Warning symbol for electrical danger to personnel.
Note: LEROY-SOMER reserves the right to modify the
characteristics to its products at any time in order to
incorporate the latest technological development.
The information contained in this document may
therefore be changed without notice.
2
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation
This manual Corresponds to the AC Generator
which you have just purchased.
Before using your machine for the first time, it is
important to read completelly this installation
and maintenance manual.
All necessary operation and instructions on this
machine must be performed by a qualified
technician.
Our technical support service will be pleased to
provide any additional information you may require.
The various operations described in the 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.

You can identify your machine quickly and accurately,
we suggest you fill in its specifications on the nameplate
below.
1.3 Identification
Make sure that the nameplate on the machine
conforms to your order.
Prior to commissioning, machines should be stored
away from humidity ; In case of relative humidity of
more than 90%, the machine insulation resistance
(IR) can drop very rapidly, just above zero at around
100% humidity Monitor the state of the anti-rust
protection on unpainted parts. For storage over an
extended period, the machine can be placed in a
sealed enclosure (heatshrunk plastic) with dehydrating
sachets inside, away from significant and frequent
variations in temperature to avoid the risk of
condensation during storage. If the area is affected
by vibration, try to reduce the effect of these vibration
by placing the generator on a damper support
(rubber disc or similar) and turn the rotor a fraction
of a turn once a fortnight to avoid marking on
bearing rings.
Mention name plate details on all your
correspondence.
1.4 Storage
1.3.1 Nameplate
Our ac generators comply with most international
standards and are compatible with IS 4722 and’
the recommendations of the
International Electrotechnical Commission.
IEC 34-1
Before using your generator for the first time,
read carefully the contensts of this installation and
maintenance manual, supplied with the machine.
All operations performed on the generator should
be undertaken by qualified personnel with specialist
traini ng in the commissioning, servi cing and
maintenance of electrical and mechanical machinery.
This maintenance manual should be retained for the
whole of the machine’s life and be handed over with
the contractual file. The various operations described
in the manual are accompanied by recommendations
or symbols to alert the user to potential risks of
aciddents. It is vital that you understand and take
notice of the different warning symbols.
1- RECEIPT
1.1.Standards and safety measures
1.2 Inspection
On receipt of your alternator, check that it has not
suffered any damage I transit. If there are obvious signs
of knocks, contact the transporter (you may able to claim
on their insurance) and after a visual check, turn machine
by hand to detect any malfunction (double bearing).
BRUSHLESS SYNCHRONOUS GENERATOR
Type
kVA
kW
Volts
AMPS.
Phase
AVR
NIDEC INDUSTRIAL AUTOMATION INDIA PRIVATE LTD.
BENGALURU - 562 162. INDIA
M/CNo.
Insul.Class
Direction DE
Ambient C
SAE / Disc
Encl.
Hz
P.F.
Duty
Conn.
Altitude
RPM
Wt.
Excitation VOLTS AMPS.
Bearing DE. NDE.
Kg.
IEC 34.1 / IS: 13364/60034
3
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation
TM
The ac generator is identified by means of a
nameplate fixed on the frame.

2 - TECHNICAL CHARACTERISTICS
2.1 Electrical characteristics
The LSAP alternator is a machine without sliprings and revolving field brushes, will have”2/3 pitch”, 6-wire,
with class ‘H’ insulation and a field excitation system available in either “SHUNT” or “AREP” version.
Two-bearing with SAE flange and standard
cylindrical shaft extension.
- Machine, self-cooled
- Degree of protection; IP 23
- Protection against harsh environment.
- Air input filter, air output labyrinth cowling.
Alternators fitted with air inlet filters should be
derated by 5% (power)
- To prevent excessive temperature rise caused by
clogged filters, it is advisable to fit the stator winding
with thermal sensors (PTC or PT 100).
2.1.1 Options
- Stator temperature detection probes.
- Space heaters.
2.2 Mechanical Characteristics
- Steel frame
- End shields in cast iron
- Greased ball bearings
- Mounting arrangement
Md35;
Single bearing with standard feet and SAE
flages/coupling discs.
B34
4
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation
2.3 Options
R-120
R121
D120

2.4 - SHUNT system with R201/R203 AVR
R201 AVR for LSAP42/43/44: R203 AVR for LSAP40
5+
5+5+
6-
6-
SERIES
Connection
SERIES
Connection
R 201
R 203
Power supply and voltage reference
Power supply and voltage reference
STATOR : 6 wires (markedT1 to T6)
STATOR : 6 wires (marked T1 to T6)
LSAP40 SHUNT version
LSAP42/43/44 SHUNT version
5
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation
T1
T4
T2
T5
T3
T6

3 -INSTALLATION
3.1 Assembly
3.1.2 Coupling
3.1.2.1 Single bearing ac generator
WARNING
All mechanical handling operations must be
While being handled, the machine should
remain horizontal.
undertaken using approved equipment.
3.1.1 Handling
The generously- sized lifting rings are for handling
the AC Generator alone, They must not be used to
lift the genset. Choose a lifting system which
respects the positioning of the rings.
Before coupling to the prime mover, check that both
are compatible by:
- Undertaking a torsional analysis of the transmission.
- Checking the dimensions of the flywheel and its
housing, the flange, coupling discs and offset.
When coupling with ac generator to the prime mover,
the holes of the coupling discs should be aligned with
the flywheel holes by cranking the engine. Do not use
the alternator fan to turn the rotor.
Tighten the coupling discs screws to the recommended
torque and check that there is lateral play on the
crankshaft.
3.1.2.2 Double bearing ac generator
Careful alignment of the machines by measuring
the concentricity and parallelism of the two parts
of the coupling is recommended, the difference
between the readings should not exceed the
pecified values (say 0.1 mm)
-Semi-flexible coupling
WARNING
This ac generator has been balanced with a ½key.
3.1.3 Location
Ensure that the ambient temperature in the room where
o
the ac generator is place cannot exceed 40 C for standard
o
power ratings (for temperatures above 40 C, apply a
derating coefficient). Fresh air, free from damp and
dust, must be able to circulate freely around the air
input louvers on the opposite side from the coupling, It
is essential to prevent not only the recycling of hot air
from the machine or engine, but also exhaustfumes.
3.2 Inspection prior to first use
0.2.1 Electrical checks
Under no circumstances should an ac generator, new
or otherwise, be operated if the insulation value is less
than 1 megohm for the stator and 100,000 ohms for the
other windings.
There are two possible methods for restoring the
above minimum values.
a) Dry out the machine for 24 hours in a drying oven
0
at a temperature of approximately 110 C.
b) Blow hot air into the air input, having made sure
that the machine is rotating with the exciter field
disconnected.
c) Run in short-circuit mode (disconnect the AVR)
- Short-circuit the output phases using connections
capable of supporting the rated current (try not to
exceed) 6A/mm2)
- Insert a clamp ammeter to monitor the current
passing through the short-circuit connections.
- Connect a 48 Volt battery in series with a rheostat
of approzimately 10 ohms (50 Watts), to the exciter
field terminals, respecting the polarity.
- Open fully all the ac generator louvers.
- Run the ac generator a rated speed. Adjust the
exciter field current using the rheostat to obtain the
rated output cuttent in the short-circuit connections.
6
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation

3.3 Terminal Connection diagrams
3.2.2 Physical and visual checks
Note : Above connections Diagrams are for explanation only
Note: Prolonged standstill: In our order to avoid these
problems, we recommend the use of space heaters, as
well as turning over the machine from time to time.
Space heaters are only effective if they are working
continuously while the machine is stopped.
- the protective louvres and housing are correctly in place
- the standard direction of rotation is clockwise as seen
from the shaft and (Phase rotation in order 1 - 2 - 3).
For anticlockwise rotation, swap 2 and 3.
- the winding connection corresponds to the
site operation voltage.
Before starting the machine for the first time, check that:
- the fixing bolts onthe feet are tight
- the cooling air is drawn in freely
To modify the connection, change the position of
the terminal cables, Consult the factory for this.
Any intervention on the ac generators terminals
durin reconnection or checks should be performed,
with the machine stopped.
Dedicated Single phase Wiring diagram.
T(N)
4
T(U)
1
T1
T4
T5 T6
T3
T2
T6
T5
T4
T3
T2
T1
U
V
N
II
II
II
I
I
W
7
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation

3.3.1 - Mechanical checks
Before starting the machine for the first time check that :
- the fixing bolts on the feett are tight.
- the cooling air is drawn in freely.
- the protective grilles and housing are correctly in place.
- the standard direction of rotation is clockwise as seen from the shaft end
(phase rotation in order 1-2-3). For anti-clockwise rotation swap 2 and 3.
- the winding connection corresponds to the site operation
voltage (see section 3.3)
3.3.2 - Terminal connection: 6 wire
3.3.3 - connection diagram for options
101
102
103
104
Ph1
Ph2
Ph3
130°C
Blue
150°C
Black
180°C
Red/white
Thermistor (PTC) temperature
Anti condensation heater
Connection codes
Voltage L.L
Factory connection
D
F
L1(U)
T1
3-phase
L3(W) L2(V)
L3(W)
L2(V)
Single-phase
L1(U)
T4
T3
T6
T5
T2
N
T1
T6
T4
T2
T5
T3
Winding 50 Hz
60 Hz
6
380-415 480
T4 T5 T6
N
NDE
L3(W)
L2(V)
L1(U)
Winding 50 Hz
60 Hz
6
220-240 240
L3(W)
L2(V)
L1(U)
U=>(T1) / V=>(T2)
N =>N
R203/ voltage sensing:
0=>(T1) / 200V=>N
R201/ voltage sensing:
R201/203 voltage sensing:
0 => (T3) / 220 V => (T2)
Operating phases :L2(V), L3 (W) single phase
In case of reconnecting, ensure that AVR voltage sensing is correct!
T3
T2
T1
T3T5
T2T4
T1T6
8
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation

4. AVR
4.1 R 120 / R 121 / D 120
The various adjustments during tests must be
made by a qualified engineer. Take care that the
drive speed specified on the nameplate is reached
before commencing adjustment. After operational
testing. Replace all access panels or covers.
3.5 Setting up
Electrical installations must comply with the current
legislation in force in the country of use.
-the differential circuit-breaker confirms to legislation
on protection of personnel, in force in the country of
use, and has been correctly installed on the ac generator
power output as close possible to the ac generator.
- any protective devices in place should not be tripped.
- if there is an external regulator, the connections
between the ac generator. and the cubicle are made in
accordance with the connection diagram.
- there is no short-circuit between phases or phase
neutral between the alternator output terminals and
the generator set control cabinet (part of the circuit
not protected by circuit-breakers or cubicle relays)
The machine should be connected with the terminal
lugs on top of one another as shown in the terminal
connection diagrams.
The machine can only be started up and used if the
installation is in accordance with the instructions
and advice defined in this manual.
The machine is tested and set at the factory. When first
used with no load, make sure that the drive speed is
correct and stable (see the nameplate). On application
of the load, the machine should maintain its rated speed
and voltage however, in the event of abnormal
operation, the machine setting can be altered. If the
machine still operates incorrectly, the cause of the
malfunction must be located.
3.3.4 Connection checks
3.4 Commissioning
Check that:
9
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation

4.2 AVR CONNECTION DIAGRAM
The AVR or Automatic Voltage Regulator type R-120 is state - of the -art advanced electronic voltage
regulator which ensures high voltage regulation within ±1%. It has an excellent dynamic response and
the recovery time of 1sec. on application of full load. The AVR is potted so that it can operate even in
humid and corrosive atmosphere. It provides factory set under-speed protection for the ac generator by
U/f function. The AVR is mounted on anti-vibration dampers for long life.
10
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation
Note : For 1 Phase connection connect, between U & N Put short link between N & N1
STATOR
ROTOR
TO LOAD
R 120
WARRANTY VOID
IF BREAK OPEN
UF SV
OPEN FOR 60Hz
R 121
WARRANTY VOID
IF BREAK OPEN
UF SV
OPEN FOR 60Hz
R1
R2
2K POTENTIOMETER,
2W / 5W
---------
-------------
------

11
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation

12
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation
4.2a AVR PARAMETER
R-120 R-121 D-120
Remote voltage
adjustment
Remote voltage
indication
Over excitation indication
SL.
No.
Characteristics
- Voltage regulation: ± 1%
- Supply range/voltage detection
230V (50HZ)
- Response time (1sec.) for a transient
voltage variation amplitude of ± 20%
- Voltage setting: V
- Stability setting : Sealed
Flickering Adjustment
1ph Indication
Phase shift Adjustment
12
13
14

103
81
UV N F +
F
f4.5
116 138
1 2 3 4 5 6 7
6
51
12.5
Residual voltage at AVR terminal > 5 VAC
4.3 - R201 & 203
4.3.1 AVR introduction
Sensing Input
Voltage
Frequency
Power Input
Voltage
Output
Voltage
Current
170~260 VAC or 370~460VAC,
1 phase 2 wire jumper selectable
50 / 60 Hz, Jumper selectable
80 ~ 260 VAC, 1 phase 2 wire
Max. 90 VDC @ 240 VAC input
Continuous 5A
Intermittent 10A for 10 sec
Min. 9 ohm
Resistance
Voltage Regulation
< ±1% ( with 4% engine governing )
Voltage Build-up
Thermal Drift
External Volts Adjustment
0.03% per ºC change in AVR ambient
± 8% with 1K ohm 1 watt trimmer
Unit Power Dissipation
Max. 10 watt
Under Frequency Protection (Factory Setting)
60 Hz system presets knee point at 57 Hz
50 Hz system presets knee point at 47 Hz
Soft Start Ramp Time
2 sec.
Dimensions
138mm Lx 103mm W x 53mm H
4.3.2 Notice of use
The R201 AVR can be mounted in various place, like generator control panel, switchgear cabinets, etc. But
prevent high temperature, high moisture, or severe vibration places. See figure 1 for mounting dimensions.
The R201 AVR surface temperature will be over 60ºC when operations. Do not touch the heat sink.
13
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation
Startup Procedure
1. Ensure all the wire of the regulator are correctly connected and the proper fuse (5A250V) is installed.
2. Turn voltage potentiometer full anticlockwise ( lowest voltage level).
3. If used, turn external voltage potentiometer to the middle position.
4. Turn stability potentiometer full clockwise (highest stability level).
5. Connect a 110VDC meter across the field F+, F- terminals.
6. Connect a 500VAC meter across line U to line V of generator.
7. Start and run the generator at no load and rated speed. The generator output voltage should build
up to a minimum level, If the voltage does not build up, it may be caused by low residual voltage of
generator. Refer to field flashing section in generator manual.
8. Slowly adjust voltage potentiometer clockwise until the generator voltage reach the proper value.
9. Turn stability trimmer clockwise until the output voltage is not stable, carefully turn stability trimmer
anticlockwise until rated stable voltage is reached. That is the match point between AVR and generator.

4.3.3 AVR DIAGRAM
1. Adjust the front panel STAB control the system stable.
2. Rotation of the front panel STAB control in the counter-clockwise (CCW) direction will speed response
time, F rotated too for CCW, the generator voltage may oscillate (shunt)
3. Rotated the front STAB control CCW until the system start oscillating and then rotate cw just past the
point where oscillation occurred.
U
V
N
W
U
V
R201 R201
ROTATING RECTIFIER
EXCITER ROTOR
EXCITER STATOR
TYPIC MAIN STATOR
3 Phase
HAND TRIMMER (OPTIONAL)
REMOVE LINK R1-R2 BEFORE CONNECTING
UES TOW-CORE TWISTED-PAIR SCREENED
CABLE(RETED 250VAC/1A)
F + F - N V U
R201
200V
400V
50/60Hz
1
2
3
4
5
6
7
VR
VR
HAND TRIMMER (OPTIONAL)
REMOVE LINK R1-R2 BEFORE CONNECTING
UES TOW-CORE TWISTED-PAIR SCREENED
CABLE(RETED 250VAC/1A)
R201
F + F - N V U
1
2
3
4
5
6
7
200V
400V
50/60Hz
TYPIC MAIN STATOR
1 Phase
14
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation
4.3.4 AVR PARAMETER
4.3.4(a) Frequency Roll-Off Adjustment
Connect a jumper from 4 to the 5 terminal for 50Hz operation, or leave the two terminals unconnected
for 60Hz operation. To reset the frequency roll-off, proceed as follow :
1. Startup engine and build voltage
2. Adjust the prime mover RPM to the desired frequency compensation (corner frequency roll-off ) point.
3. Adjust the front panel FREQ control until the output voltage low about 5V than nominal voltage.
( For 50Hz application, the frequency “roll-off” is factory preset to 47Hz, for 60Hz operation, the frequency
is 57hZ).
4.3.4(b) Voltage Adjustment
1. Adjust the front panel VOLT to vary the generator nominal voltage.
2. If used, a 1kW 1watt potentiometer may be connected to terminals VR and VR, refer to Figure4,5.
4.3.4(c) Stability Adjustment-

5 - SERVICING, MAINTENANCE
15
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation
These instructions apply to the alternator of which you have just taken possession. We would
like to draw your attention to the contents of this maintenance manual.
5.1 SAFETY MEASURES
Before operating your machine, you must
have read this installation and maintenance
manual completely.
All operations this interventions to be carried
out to operate this machine will be carried
out by qualified personnel.
Our technical support service is at your disposal
for all the information you need.
The various operations described in this manual
are accompanied by recommendations or
symbols to make the user aware of the risks of
accidents. It is imperative that you understand
and respect the various
ATTENTION
Safety note for an intervention that can damage
or destroy the machine or the surrounding
equipment.
Safty instruction for general danger to
personnel.
Safty instruction for electrical danger to
personnel.
We would like to draw your attention to the
following 2 safety measures:
SECURITY INSTRUCTIONS
B) Do not allow children under the age of
14 to be approached by air outlets A sticker
sheet of the various safety instruction is
attached to this mai nten ance man ual.
They will be positioned according to the
drawing and when the machine is completely
installed
A) During operation, prohibit the parking
of any person in front of the air outlet grills
due to a possible risk of material projection.
WARNING
The alternators shall not be put into service
until the machinery in which they are to be
incorporated has been declared in conformity
with the EC Directives and any other applicable
di rectives. The se ins truc tion s mus t be
transmitted to the end user the range of
electrical alternators and related products
manufactured by us or on our behalf comply
with the technical requirements of the Customs
Union (EAC) Directives.
© - We reserve the right to modify the
characteristics of this product at any time to
bring the latest technological developments.
The information contained in this documents
is subject to change without this document
may not be reproduced in any form without
our prior authorization. Trademarks, models
and patents filed.

5.2 Electrical faults
Fault Action Effect Check/Cause
No Voltage
at no load
on start-up
Connect a new
battery of 4 to 12
volts to terminal
E- and E+.
respectively for a
time period for
2 to 3 seconds
The alternator builds up
but its voltage does not
reach the rated value when
the battery is removed
The alternator builds up
but its voltage disappears
when the battery is
removed.
- Lack of residual magnetism
- Check the connection of the
voltage reference to the AVR
- Faulty diode
- Armature short-circuit
- Faulty AVR
- Field windings open circuit
(check winding)
- Main field winding short-circuited
- Check the AVR connections
(possible AVR failure
- Field windings short-circuited
- Rotating diodes burn out.
- Main field winding short
circuited - check the resistance
- Increase the drive speed
- Check the speed : Possibility of
cyclic irregularity
- Loose connections
- Faulty AVR
(Do not touch the AVR voltage pot.
(P2) before running
at the correct speed.)
Faulty AVR
- Exciter winding open circuit
- Faulty exciter armature
- Faulty AVR
- Main field open circuit or
short-circuited
Check the AVR.
surge suppressor,
rotating diodes and
replace any defective
components.
Voltage
disappear
during
operation
The voltage does not return
to the rated value.
If not effect, try normal
fast recovery modes (St2)
Voltage
too low
Voltage
too High
Voltage
oscillations
Check the drive
speed
Adjust AVR voltage
potentiometer
Adjust AVR stability
potentiometer
The speed is corrected.
Speed too low
Ineffective adjustments.
(*) Warning : During single-phase operation, check that the sensing wires from the AVR are connected to the
correct output terminals.
16
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation

5.3 Checking the winding
5.4 Checking the diode bridge
You can check the winding ins insulation by performing
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.
A diode in good working order must allow the current
to flow from the anode to the cathode.
5.5 Checking the windings and rotating diodes
using separate excitation
During this procedure, make sure that the ac generator
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
rheostat of approximately 50 ohms 300 W and a
diode on both field wires (+) and (-).
Assembly B : Connect a “Variac” variable power supply
and diode bridge on both exciter field wires (+) and (-).
Both these systems should have characteristics which are
compatible with the machine field excitation power
(see the nameplate).
3) Run the unit at rated speeds.
4) Gradually increase the exciter field current by
adjusting the rheostat or the variac and measure
the output voltages on U,V, W checking the excitation
voltage and current at no load and on load (see the
machine nameplate or ask for the factory test report).
When the output voltage is at its rated value and
balanced within 1% for the rated excitation level, the
machine is in good working order. The fault therefore
comes from the AVR or its associated wiring (ie. sensing
auxiliary, windings).
17
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation

6.3 Accessing, checking and replacing
diodes
- Remove the terminal box cover
- Remove the air intake louver
- Unscrew the fixing clamps on the power output
cables, disconnect E+, E-on the exciter
- Remove the 4 nuts on the studs
- Remove the NDE bracket using an extractor.
- Remove the surge suppressor
- Remove the 4 fixing screws from the diode bridges
on the armature.
- Disconnect the diodes.
- Check the 6 diodes using either an ohmmeter or a
battery lamp
6.3.1 Dismantling
- Replace the diodes, respecting the polarity
- Replace the surge suppressor
- Insert a new O ring in the bearing housing.
- Refit the NDE shield and pass the bundle of
wire between the top bars of the flange.
- Refit the air intake louvre
- Refit the terminal box cover
6.3.2 Reassembly
6.2. Screw tightening torque
IDENTIFICATION
Field term. block screw
Field screw
Diode bridge screw
Diode nut
Assembly rod
Earth screw (if installed)
Balancing bolt
Discs/shaft screw
Lifting screw
Grill screw
Cover screw
SCREWØ
M4
M6
M6
M5
M8
M6
M5
M10,12,16
M8
M6
M6
Torque N.m
4N.M
10N.m
5N.m
4N.m
20N.m
5N.m
4N.m
66,110,250
4N.m
5N.M
5N.m
6- DISMANTLING, REASSEMBLY
- 1 ratchet spanner + extension
- 1 torque wrench
- 17 mm flat spanner
-18 mm flat spanner
-110 mm flat spanner
-112 mm flat spanner
-18 mm socket
-110 mm socket
-113 mm socket
-15 mm Allen key
-16 mm Allen key
-1 puller
6.1 Tools required
During the warranty parlod, this operation should
only be esrried out in an approved workshop or in
our factory, otherwise the warranty may be
invalidated.
WARNING
Whilst being handled, the machine should remain
norizontal
18
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation

6.4 Replacing the NDE bearing on a single
bearing machine
6.4.1 Dismantling
6.4.2 Reassembly
6.5 Replacing the DE bearing on a two
machine
bearing
6.5.1 Dismantling
6.5.2 Reassembly
6.6 Accessing the main field and stator
6.6.1Dismantling
6.6.2 Reassembly
Follow the procedure for reassembling the bearings
After final adjustments, the access panels
or cover should be refitted
- After extraction, be careful with the fan. It is necessary
to replace the fan in case of disassembling.
NOTE: If intervention is required on the main field
(rewinding, replacement of components), the rotor
assembly must be rebalanced.
- Follow the dismantling procedure in reverse order.
Take care not to knock the windings when refitting
the rotor in the stator.
- Heat the inner slipring of a new bearing by induction
0
or in a drying oven at80 c (do not use an oil bath) and
fit it to the machine.
- Place the preloading wavy washer in the flang
and fit a new O ring seal.
- Uncouple the alternator from the prime mover.
- Remove the 8 assembly screws.
- Remove the DE flange.
- Remove the NDE shield.
- Remove both bearings using a puller.
- Fit new bearings after heating them by induction
0
or in a drying oven at 80 C (do not use an oil bath).
- Check that both the preloading wavy washer and
new O ring seal have been fitted on the NDE shield
Replace the DE flange, and tighten the fixing screws.
- Check that the whole machine is correctly assembled
and that all screws are fully tightened.
Follow the procedure for dismantling bearings.
- Remove the coupling dies (Single-breaing machine)
or the DE flange (two-bearing machine) and insert a
tube of
19
TM
LSAP 40 / 42.3 / 44.3 / 45 / 46.2-4 POLE
A.C. GENERATORS
INSTALLATION AND MAINTENANCE
Electric Power Generation
- Replace the NDE bracket
the corresponding diameter on the shaft end or an
support made according the following bellow.
- Rest the rotor on one of its poles, then slide it out,
Use the tube as a lever arm to assist dismantling.
If you replace the fan, respect the assembly guide
according the following bellow. Use a tube and a
screw.