Nidec LEROY-SOMER TAL A47 Instruction Manual

TAL A47
Low Voltage Alternator - 4 pole
Installation and maintenance

2
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
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 first time,
it is important to read the whole of this
installation and maintenance manual.
All necessary operations and interventions
on this machine must be performed by a
qualified technician.
Our technical support service will be pleased
to provide any additional information you
may require.
The various operations described in this
manual are accompanied by recommenda-
tions or symbols to alert the user to potential
risks of accidents. It is vital that you under-
stand and take notice of the following war-
ning 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.
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 (EAC).
© - 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 authorisation.
All brands and models have been registered
and patents applied for.
WARNING

3
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
CONTENTS
1 - RECEIPT ........................................................................................................................4
1.1 - Standards and safety measures ..............................................................................4
1.2 - Inspection................................................................................................................4
1.3 - Identification............................................................................................................4
1.4 - Storage ...................................................................................................................4
1.5 - Applications.............................................................................................................4
1.6 - Usage restrictions....................................................................................................4
2 - TECHNICAL CHARACTERISTICS ................................................................................5
2.1 - Electrical characteristics..........................................................................................5
2.2 - Mechanical characteristics ......................................................................................5
3 - INSTALLATION................................................................................................................... 9
3.1 - Assembly.................................................................................................................9
3.2 - Checks prior to first use ...........................................................................................9
3.3 - Terminal connection diagrams ...............................................................................10
3.4 - Commissioning......................................................................................................13
3.5 - Setting up ..............................................................................................................13
4 - SERVICING - MAINTENANCE .....................................................................................14
4.1 - Safety measures ...................................................................................................14
4.2 - Routine maintenance.............................................................................................14
4.3 - Bearings................................................................................................................15
4.4 - Mechanical defects................................................................................................15
4.5 - Electrical faults ......................................................................................................16
4.6 - Dismantling, reassembly .......................................................................................18
4.7 - Installation & maintenance of the PMG ..................................................................20
4.8 - Table of characteristics ..........................................................................................20
5 - SPARE PARTS ........................................................................................................................21
5.1 - First maintenance parts .........................................................................................21
5.2 - Technical support service ......................................................................................21
5.3 - Accessories...........................................................................................................21
5.4 - Exploded view, parts list and tightening torque ......................................................22
Disposal and recycling instructions
EC Declaration of compliance and incorporation

4
1 - RECEIPT
1.1 - Standards and safety
measures
Our alternators comply with most
international standards.
See the EC Declaration of Incorporation on
the last page.
1.2 - Inspection
On receipt of your alternator, check that it
has not suffered any damage in transit. If
there are obvious signs of knocks, contact
the transporter (you may be able to claim
on their insurance) and after a visual
check, turn the machine by hand to detect
any malfunction.
1.3 - Identification
The alternator is identified by means of a
nameplate fixed on the machine (see
drawing).
Make sure that the nameplate on the
machine conforms to your order.
So that you can identify your alternator
quickly and accurately, we suggest you fill in
its specifications on the nameplate below.
1.4 - 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 significant vibration.
1.5 - Application
This alternator is mainly designed to
produce electricity in the context of
applications involving the use of
generators.
1.6 - 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.
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole

5
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
2 - TECHNICAL CHARACTERISTICS
2.1 - Electrical characteristics
This alternator is a machine without sliprings
or revolving armature brushes, wound as
“2/3 pitch”, 6 or 12-wire, with class H
insulation and a field excitation system
available in either SHUNT, AREP or PMG
version. The alternator complies with EN
61000-6-3, EN 61000-6-2, EN 55011.
• Electrical options
- Space heater
- R791 interference suppression
2.2 - Mechanical characteristics
- Steel frame
- Cast iron end shields
- Protected ball bearings, greased for life
- Mounting arrangements: single bearing
with standard feet and SAE flanges/coupling
discs
- Drip-proof machine, self-cooled
- Degree of protection: IP 23
• SHUNT three-phase 6-wire
STATOR : 6 wires (T1 to T6 identification)
T1
U1
T4
U2
green
yellow
F1 NW V
MAIN
FIELD
EXCITER
T2
V1
T3
W1
Armature
Delta
connection
+
Exciter field
-
T5
V2
T6
W2
Rotating
rectifiers
blue
2K/2.5K
(1W)
option
ST1
ST2
Option:
R1
-
R2
-
External
remote
voltage trimmer (remove ST1)
Droop
R2 R1 Q2 Q1 F2
FUSE
50
Hz
60 Hz
R150
Consult
R150
manual
ref. 5384
A1
A2
V
AC S UF SL UF OE
white
50/60
Hz LINK
blue
Varistor
Star connection

6
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
• SHUNT three-phase 12-wire
STATOR : 12-wire (T1 to T12 identification)
EXCITER
MAIN FIELD
T1 T7
T2 T8 T3 T9
Armature
+
Exciter field
-
Rotating rectifiers
T4 T10 T5 T11 T6 T12
blue
green
yellow
D
T11
T3
T2
3 PH
A F
T1 T1
T3 T3
T2 T2
2K/2.5K (1W)
option
ST1 ST2
Option: R1-R2 - External remote
voltage trimmer (remove ST1)
Droop R2 R1 Q2 Q1 F2 F1 N W V
FUSE
50 Hz
60 Hz
R150
Consult R150 manual
ref. 5384
A1
A2
V AC S UF SL UF OE
red
50/60 Hz LINK
black
Varistor

7
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
• AREP three-phase 6 or 12-wire
MAIN FIELD
Auxiliarywindings STATOR: 12-wire (T1 to T12 identification)
EXCITER
Armature
Exciter field
- +
Rotating rectifiers
red or white
black or blue
STATOR: 6-wire
(T1 to T6 identification)
TI04 on T4
1 kOhm 1W mini
ST
6- 5+ 11 10 9 12 8 7
red 3
*
or
*
red 2
Consult manual ref.5599
Detection according to voltage:
V/W for high voltage (380-480V)
L1/L2 for low voltage (190-240V)
E01
Deexcitation
Auxiliarywindings
9 12
Green Black
OPEN E01
R180
X1
Z2
CONTACTS NOT SUPPLIED
*
Varistor
red
yellow
green
black
OPTION
// CT (TI04)
TI04: In/2 / 1A - (D) Series star
T10 or
T4
TI04
P2 P1
Neutral
T10 or
T4
8 -> Q1 For anti-clockwise rotation
7
-
>
Q2
External remote voltage trimmer
(remove ST)

8
Rotating
rectifiers
red or white
black or blue
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
• PMG three-phase 6 or 12-wire
EXCITER
MAIN FIELD
PMG
STATOR: 12-wire (T1 to T12 identification)
Armature
Exciter field
- +
STATOR: 6-wire
(T1 to T6 identification)
TI04 on T4
1 kOhm 1W mini
ST
6- 5+
14 15 16
8 7
red 3
*
or
*
red 2
Consult manual ref.5599
Detection according to voltage:
V/W for high voltage (380-480V)
L1/L2 for low voltage (190-240V)
E01
Deexcitation
Auxiliarywindings
9 12
Green Black
OPEN E01
R180
X1
Z2
CONTACTS NOT SUPPLIED
*
Varistor
OPTION
// CT (TI04)
TI04: In/2 / 1A - (D) Series star
T10 or
T4
TI04
P2 P1
Neutral
T10 or
T4
8 -> Q1 For anti-clockwise rotation
7
-
>
Q2
External remote voltage trimmer
(remove ST)

9
• Double-bearing coupling
- Semi-flexible coupling
Careful alignment of the machines is
recommended, checking that the lack of
concentricity and parallelism of both parts
of the coupling do not exceed 0.1 mm.
This alternator has been balanced with a
1/2 key.
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
3 - INSTALLATION
Personnel undertaking the various
operations indicated in this section must
wear personal protective equipment
appropriate for mechanical and electrical
hazards.
3.1 - Assembly
• Single-bearingcoupling
Before coupling, check the compatibility
between the alternator and the engine by
performing:
- undertaking a torsional analysis of the
transmission (alternators data are available
on request),
- checking the dimensions of the flywheel
and its housing, the flange, coupling discs
and offset.
All mechanical handling operations
must be undertaken using suitable
equipment and the machine must be
horizontal.Checkhowmuchthemachine
weighs before choosing the lifting tool.
During this operation, do not allow
anyone to stand under the load.
• Handling
The generously-sized lifting eyes are for
handling the alternator only. They must not
be used to lift the genset. The choice of
liftinghooksorhandlesshouldbedetermined
by the shape of the lifting eyes. Choose a
lifting system which respects the integrity
and the environment of the machine.
During this operation, do not allow
anyone to stand under the load.
When coupling the alternator to the
prime mover, do not use the fan to turn
the alternator or rotor.
The holes of the coupling discs should
be aligned with the flywheel holes by
cranking the engine.
Make sure the machine is securely
bedded in position during coupling.
Check that there is lateral play on the
crankshaft.
• Location
The location where the alternator is placed
must be ventilated to ensure that the
ambient temperature cannot exceed the
data on the nameplate.
3.2 - Checks prior to first use
• Electrical checks
Under no circumstances should an
alternator, new or otherwise, be operated
if the insulation is less than 1 megohm
for the stator and 100,000 ohms for the
other windings.
WARNING

10
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
There are 2 possible methods for restoring
the above minimum values.
a) Dry out the machine for 24 hours in a
drying oven at a temperature of 110 °C
(without the regulator).
b) Blow hot air into the air intake, having
made sure that the machine is rotating with
the exciter field disconnected.
Note : Prolonged standstill
In order to avoid these problems, we
recommend the use of space heaters, as
well as turning over the machine from time
to time. Space heaters are only really
effective if they are working continuously
while the machine is stopped.
Ensure that the alternator has the degree
of protection matching the defined
environmentalconditions.
• Mechanical checks
Before starting the machine for the first time,
check that:
- all fixing bolts are tight,
- the length of bolt and the tightening torque
are correct,
- the cooling air is drawn in freely,
- the protective grille and housing are cor-
rectly in place,
- the standard direction of rotation is clock-
wise as seen from the drive end (phase
rotation in order 1 - 2 - 3).
For anti-clockwise rotation, swap 2 and 3.
- the winding connection corresponds to the
site operating voltage (see section 3.3).
3.3 - Terminal connection diagrams
To modify the connection, change the
position of the stator cables on the terminals.
The winding code is specified on the
nameplate.
Any intervention on the alternator
terminals during 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

11
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
• SHUNT three-phase 6-wire
Connectioncodes Factory connection
R150
D
3PH
Star
T3
L3(W)
L1(U)
T1
T4
T6 T5
T2
L2(V)
T5
T4
T6
T3
T2
T1
DE
W(3) L3
V(2) L2
U(1) L1
N
NDE
F
3PH
DE
Delta
T6
T1
T5 T3 W(3) L3
T4 T2 V(2) L2
T3 T4
T5 T2
T6 T1 U(1) L1
NDE
• AREP or PMG three-phase 6-wire
Connectioncodes Voltage / Detection Factory connection
D
3PH
L1(U)
Star
T1
T4
T6 T5
T3 T2
L3(W)
L2(V)
Winding
50 Hz 60 Hz
DE
W(3) L3
T5 T3
V(2) L2
T4 T2
U(1) L1
T6 T1
N NDE
6 S
380 - 415 380 - 480
8 S
-
380 - 416
R180 (380V < U < 480V) :
V => T2, W => T3
F
1PH
or
Delta
L1(U)
3PH
T6
T1
T3 T4
L3(W) L2(V)
L
T5 T2
L
Winding
50 Hz 60 Hz
DE
W(3) L3
T5 T3
V(2) L2
T4 T2
U(1) L1
T6 T1
NDE
6 S
220 - 240 220 - 240
8 S
-220 - 240
R180 (220V < U < 240V) :
L1 => T2, L2 => T3
In case of reconnection, ensure that AVR voltage detection is correct !

12
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
• SHUNT, AREP or PMG three-phase 12-wire
Connection codes Voltage/Detection Factory connection
A
3PH
Parallel Star
T9
L3(W)
T3
L1(U)
T1 T7
T4
T10
T12
T5
N
T11
T6
T8
T2
L2(V)
Winding
50 Hz 60 Hz
DE
NDE
6
190 - 208 190 - 240
8 -190 - 208
R150 :
N => T1, V => T2, W => T3
R180 (190V < U < 240V) :
L1 => T2, L2 => T3
D
3PH
Series Star
T3
L3(W)
T9
T6
T1
T4
T12
L1(U)
T7
T10
T11
T8
T5
T2
L2(V)
Winding
50 Hz 60 Hz
DE
NDE
6
380 - 415 380 - 480
8
-380 - 416
R150 :
N => T11, V => T2, W => T3
R180 (380V < U < 480V) :
V => T2, W => T3
F
L1(U)
1PH
Winding
50 Hz 60 Hz
DE
(L)
6
220 - 240 220 - 240
or
Series
Delta
T12
T1
3PH
T9
T4
8
-220 - 240
T6
T7
R150 :
N => T1, V => T2, W => T3
R180 (220V < U < 240V) :
L1 => T2, L2 => T3
T3
T10
(L)
NDE
L3(W)
L2(V)
T11
T8
T5
T2
L
M
L
Voltage LM = 1/2 voltage LL
In case of reconnection, ensure that AVRvoltage detection iscorrect !
Wecansupplyasetofflexible shuntsandspecialconnectionlinksasanoptionformakingtheseconnections.

13
regreasable
bearing
option,
we
recommend
greasing the bearings at the time of
commissioning (see section 4.3).
With
the
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
• Connection checks 3.4 - Commissioning
Electrical installations must comply with
the current legislation in force in the
country of use.
Check that:
- The residual circuit-breaker conforms to
legislation on protection of personnel, in
force in the country of use, and has been
correctly installed on the alternator power
output as close as possible to the alternator.
(In this case, disconnect the wire of the
interference suppression module linking the
neutral).
- Any protection devices in place have not
been tripped.
- If there is an external AVR, the connections
between the alternator and the cabinet are
made in accordance with the connection
diagram.
- There is no short-circuit phase-phase or
phase-neutral between the alternator output
terminals and the generator set control
cabinet (part of the circuit not protected by
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 machine can only be started up and
used if the installation is in accordance
with the regulations and instructions
defined in this manual.
The machine is tested and set up at the
factory. When first used with no load, make
sure that the drive speed is correct and
stable (see the nameplate).
On application of the load, the machine
should achieve its rated speed and voltage;
however, in the event of abnormal operation,
the machine setting can be altered (follow
the adjustment procedure in section 3.5). If
the machine still operates incorrectly, the
cause of the malfunction must be located
(see section 4.5).
3.5 - Setting up
- 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.
The various adjustments during tests
must be made by a qualified engineer.
Ensure that the drive speed specified on
the nameplate is reached before
commencingadjustment.
After operational testing, replace all
access panels or covers.
TheAVRisused to make any adjustments
to the machine.
Diameter M6 M8 M10 M12
Torque 4 Nm 10 Nm 20 Nm 35 Nm
Tolerance ± 15%

14
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
4 - SERVICING - MAINTENANCE
4.1 - Safety measures
Servicing or troubleshooting must be
carried out strictly in accordance with
instructions so as to avoid the risk of
accidents and to maintain the machine in
its original state.
All such operations performed on the
alternator should be undertaken by
personnel trained in the commissioning,
servicing and maintenance of electrical
and mechanical components, 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.
4.2 - Routine maintenance
• Checks after start-up
After approximately 20 hours of operation,
check that all fixing 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 flushes
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
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 fitted with air inlet and outlet
filters, the maintenance personnel should
clean them routinely at regular intervals. In
the case of dry dust, the filter 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 sections
3.2 and 4.5).
WARNING

15
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
4.3 - Bearings
4.4 - Mechanical defects
Fault Action
Bearing
Excessive overheating of one
or
both bearings
(bearing temperature 80°C above
the ambient temperature)
If the bearing has turned blue or if the grease has turned
black, change the bearing.
Bearing not fully locked (abnormal play in the bearing cage)
End shields incorrectly aligned
Abnormal
temperature
Excessive overheating of
alternator frame (more than
40° C above the ambient
temperature)
Air flow (inlet outlet) partially clogged or hot air is being
recycled from the alternator or engine
Alternator operating at too high a voltage (>105% of Un on
load)
Alternator overloaded
Vibrations
Too much vibration
Misalignment (coupling)
Defective mounting or play in coupling
Rotor balancing fault (Engine Alternator)
Excessive vibration and humming
noise coming from the machine
Phase imbalance
Stator short circuit
Abnormal
noise
Alternator damaged by a
significant impact, followed by
humming and vibration
System short circuit
Misparalleling
Possible consequences
Broken or damaged coupling
Broken or bent shaft end
Shifting and short circuit of main field
Fan fractured or coming loose on shaft
Irreparable damage to rotating diodes/AVR, surge suppressor
The bearings are permanently greased Approximate life of the grease (depending on use) =
20,000 hours or 3 years.

16
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
4.5 - Electrical faults
Fault Action Effect Check/Cause
No voltage
at no load on
start up
Connect a new
battery of 4 to 12
volts to terminals
F1 and F2,
respecting the
polarity, for 2 to 3
seconds
The alternator builds up and
its voltage is still correct
when the battery is removed
Lack of residual magnetism
The alternator builds up but
its voltage does not reach
the rated value when the
battery is removed
Check the connection of the voltage reference
to the AVR
Faulty diodes
Armature short circuit
The alternator builds up but
its voltage disappears when
the battery is removed
Faulty AVR
Field windings open circuit (check winding)
Revolving field coil open circuit (check the
resistance)
Voltage too
low
Check the drive
speed
Correct speed
Check the AVR connections (AVR may be
faulty)
Field windings short circuited
Rotating diodes burnt out
Revolving field coil short circuited (check the
resistance)
Speed too low
Increase the drive speed (do not touch the AVR
voltage pot. before running at the correct
speed)
Voltage too
high
Adjust AVR voltage
potentiometer Adjustment ineffective Faulty AVR
Voltage
oscillations
Adjust the
AVR stability
potentiometer
Check the speed: possibility of cyclic
irregularity
Loose connections
Faulty AVR
Speed too low when on load
Voltage
correct at no
load and too
low when on
load
Run at no load and
check the voltage
between F1 and F2
on the AVR
Voltage between F1 and F2
(DC)
SHUNT / AREP / PMG < 10V
Check the speed
Voltage between F1 and F2
SHUNT / AREP / PMG > 15V
Faulty rotating diodes
Short circuit in the revolving field coil (check
the resistance)
Faulty exciter armature (check the resistance)
Voltage
disappears
during
operation
Check the AVR, the
surge suppressor,
the rotating diodes,
and replace any
defective
components
The voltage does not return
to the rated value
Exciter winding open circuit
Faulty exciter armature
Faulty AVR
Revolving field coil open circuit or short
circuited

17
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
• Checking the winding
You can check the winding insulation by
performing a high voltage test. In this case,
you must disconnect all AVR wires.
Assembly A: Connect a 12 V battery in
series with a rheostat of approximately
50 ohms - 300 W and a diode on both exciter
field wires (5+) and (6-).
ASSEMBLY A
conditions is not covered by our
warranty.
• Checking the diode bridge
A diode in good working order should allow
the current to flow only in the anode-to-
cathode direction.
Assembly B: Connect a “Variac” variable
power supply and a diode bridge on both
exciter field wires (5+) and (6-).
A
A no d e
C
C a t h o d e
+ -
Both these systems should have
characteristics which are compatible with
the field excitation power of the machine
(see the nameplate).
3) Run the unit at its rated speed.
A C
A A A
• Checking the windings and rotating
diodes using separate excitation
4) Gradually increase the exciter field
current by adjusting the rheostat or the
variac and measure the output voltages on
L1 - L2 - L3, checking the excitation voltage
and current at no load (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).
ASSEMBLY B 6 -
Field
5 +
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.
Variac
AC
220V
+
1A diode
-
DC
12V
-
~
~
~
C C C
-
WARNING
6
-
Field
5
+
1A
diode
Rh. 50
-
300W
-
+
12V battery
C
C
C
A
A
A
+
-
A
C
80
20

18
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
4.6 - Dismantling, reassembly
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.
• Tools required
To fully dismantle the machine, we
recommend using the tools listed below:
- 1 ratchet spanner + extension
- 1 torque wrench
- 1 set of flat spanners: 8 mm, 10 mm, 18 mm
- 1 socket set: 8, 10, 13, 16, 18, 21, 24, 30 mm
- 1 puller (U35) / (U32/350)
• Screw tightening torque
See section 5.4.
• Access to diodes
- Open the air intake grille (51).
- Disconnect the diodes.
- Check the 6 diodes using an ohmmeter or
a battery lamp.
If the diodes are faulty:
- Remove the surge suppressor (347).
- Remove the 6 «H» nuts for mounting the
diode bridges on the support.
- Change the crescents, respecting the
polarity.
• Access to connections and the
regulation system
Access directly by removing the top of the
terminal box lid (48).
• Replacing the NDE bearing
- Remove the air intake grille (51).
- Remove the the terminal box lid (48) and
the side panel (366).
- Remove the hook (21) and the cover rear
panel (365).
- Replace the hook (21) in order to
manipulate the fl
- Disconnect the exciter wires.
- Remove the bearing (78) thrust screws.
- Remove all 5 screws (36).
- Remove the shield (36).
- Take out the antifriction bearing (70) using
a puller with a central screw (see drawing
below).
- Fit the new antifriction bearing onto the
shaft after heating it by induction to
approximately 80 °C.
- Mount the new preloading (wavy) washer
(79) + the new “O” ring seal (349) in the
shield (36).
- Screw a threaded rod into the thrust
bearing (78).
- Refit the end shield on the machine using
a dowel and nut in the shaft extension (see
drawing).
- Slide the threaded rod into the shield hole
to make it easier to assemble (see basic
diagram).
WARNING

19
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
- Fit the thrust bearing screws (78), remove
the threaded rod, fit the other screw and
tighten up the assembly.
- Tighten the 5 bearing screws (36).
- Reconnect exciter wires E+, E-.
- Finish reassembling the cover.
When dismantling the shields, you will
need to change the antifriction bearings,
the “O” ring seal, the preloading (wavy)
washer and adhesive paste.
• Dismantling the rotor assembly
- Remove the NDE shield (36).
- Remove the DE shield (30).
- Support the DE rotor (4) with a strap or with
a support constructed in accordance with
the following drawing.
- Move the strap as the rotor moves in order
to distribute the weight over it.
- After extracting the rotor, be careful not to
damage the fan and place the revolving field
on special V-blocks.
When dismantling the rotor involves
changing parts or rewinding, the rotor
must be rebalanced.
• Reassembling the machine
- Mount the rotor (4) in the stator (1) (see
drawing above) taking care not to knock the
windings.
- Mount the new preloading (wavy) washer
(79) + the new “O” ring seal (349) in the
shield (36).
- Screw a threaded rod into the thrust
bearing (78).
- Refit the shield (36) on the machine using
a dowel and nut in the shaft extension (see
diagram).
- Slide the threaded rod into the shield hole
to make it easier toassemble (see diagram).
- Fit the thrust bearing screws (78), remove
the threaded rod, fit the other screw and
tighten up the assembly.
- Tighten the 5 bearing screws (36).
- Reconnect exciter wires E+, E-.
- Finish reassembling the cover.
- Refit the flange (30) on the stator (1).
- Tighten the screws (30).
- Mount the new preloading (wavy) washer
(79) + the new “O” ring seal (349) in the
shield (36).
- Refit the shield (36) on the machine using
a dowel and nut in the shaft extension (see
diagram).
- Tighten the 5 shield screws (36).
- Reconnect exciter wires E+, E-.
- Finish reassembling the cover.
WARNING
WARNING
Rotor
4
78
36
Threaded
rod
Dowel
Nut
NDE
shield

20
Electric Power Generation
Installation and maintenance 5878en-2022.03/e
TAL A47
Low Voltage Alternator - 4 pole
- Screw a threaded rod into the thrust
bearing.
- Refit the shield (30) on the machine.
- Slide the threaded rod into the shield hole
to make it easier to assemble (see basic
diagram).
- Fit the thrust bearing screws, remove the
threaded rod, fit the other screw and tighten
up the assembly.
- Tighten the 6 shield screws (30).
- Refit the air outlet grille (33).
- Check that the machine assembly is
correctly mounted and that all screws are
tightened.
4.7 - Installation and maintenance of
the PMG
The PMG reference is PMG 2.
See the PMG manual ref : 4211.
4.8 - Table of characteristics
Table of average values:
Alternator - 4 poles - 50 Hz - Standard
winding No. 6S (6-wire) (400 V for the
excitation values).
The voltage and current values are given for
no-load operation and operation at rated
load with separate field excitation.
All values are given to within ± 10% and may
be changed without prior notification (for
exact values, consult the test report).
• Three-phase: 4-pole
SHUNT/AREP excitation
Resistances at 20 °C (Ω)
Resistances of auxiliary windings
AREP at 20 °C (Ω)
Type X1, X2 Z1, Z2
A0.344 0.462
B-C 0.317 0.505
D0.309 0.450
E0.294 0.411
F* 0.265 0.377
• Table of weights
(values given for information only)
Type Total weight (kg) Rotor (kg)
A976 375
B-C 1113 427
D1240 477
E1289 494
F* 1372 525
* Only available for 6-wire
Afteroperational testing, it isessential to
replace all access panels or covers.
Type Stator L/N Rotor
Exciter
field
Exciter
armature
A0.0080 0.455 10.64 0.071
B-C 0.0062 0.521 10.64 0.071
D0.0044 0.579 10.64 0.071
E0.0046 0.604 10.64 0.071
F* 0.0035 0.645 10.64 0.071