4067 en - 2009.
05 / b
STATOR : 12 wires (marking T1 to T12)
MAIN FIELD
T1 T7
T2
T8
T3
T4
T5
T11
T6
Varistor
SHUNT SYSTEM
5+
Induced
6-
Field
T10
75 mm
R 250
P1
Voltage
ST4
Stability
KNEE
65Hz
LAM OFF
KNEE
57Hz
LAM OFF
Option
External potentiometrer
for voltage adjusting
R250
A.V.R.
Installation and maintenance
LAM OFF
SPECIAL
8
7
50Hz
901
23
P2
KNEE
47.5Hz
78
Slow fuse
250V 8 A
60Hz
LAM
OFF
2
3
13%
25%
OFF
13%
25%
LAM
FREQ. & L.A.M. CONFIG.
F1
456
n to
give
to be
s
i
l
er
ua
man e end us
This
th
STAB VOLT
140 mm
110 0V E+ E-
4 x holes 5.8 x
50 x 115 mm
Frequency selector 50 H
/ 60 Hz for U/F fonction
and LAM adjustement
LEROY-SOMER
Installation and maintenance
R250
4067 en - 2009.05 / b
A.V.R.
This manual concerns the alternator A.V.R. which you have just purchased.
We wish to draw your attention to the contents of this maintenance manual. By following
certain important points during installation, use and servicing of your A.V.R., you can
look forward to many years of trouble-free operation.
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.
WARNING
Warning symbol for an operation capable
of damaging or destroying the machine
or surrounding equipment.
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 general danger to
personnel.
Warning symbol for electrical danger to
personnel.
Note : LEROY-SOMER reserves the right to
modify the characteristics of its products at
any time in order to incorporate the latest
technological developments.
The information contained in this document
may therefore be changed without notice.
LEROY-SOMER
Installation and maintenance
R250
4067 en - 2009.05 / b
A.V.R.
SUMMARY
1 - SUPPLY...............................................................................................................................4
1.1 - SHUNT excitation system.............................................................................................4
2 - R250 A.V.R..........................................................................................................................5
2.1 - Characteristics.............................................................................................................. 5
2.2 - U/F fonction and LAM....................................................................................................5
2.3 - R250 A.V.R. option........................................................................................................ 5
2.4 - LAM Characteristics .....................................................................................................6
2.5 - Typical effects of the LAM..............................................................................................7
3 - INSTALLATION - COMMISIONING....................................................................................8
3.1 - Electrical checks on the AVR.........................................................................................8
3.2 - Settings.........................................................................................................................8
3.3 - Electrical faults.............................................................................................................. 9
4 - SPARE PARTS.................................................................................................................. 10
4.1 - Designation.................................................................................................................10
4.2 - Technical support service............................................................................................10
Any maintenance or breakdown operations on the A.V.R. are to be done by personnel
trained on commisioning, servicing and maintenance for the electrical and mechanical
elements.
The R250 is an IP00 product. It must be installed inside a unit so that this units cover can provide
IP20 minimum total protection (it must only be installed on LS alternators in the appropriate
location so that when viewed externally, it has a higher degree of protection than IP20).
Copyright 2005: MOTEURS LEROY-SOMER
This document is the property of:
MOTEURS LEROY SOMER.
It may not be reproduced in any form without prior authorization
All brands and models have been registered and patents applied for.
LEROY-SOMER
Installation and maintenance
4067 en - 2009.05 / b
R250
A.V.R.
1 - SUPPLY
1.1 - SHUNT excitation system
The regulator controls the excitation current
according to the alternators output voltage.
With a very simple conception, the SHUNT
excitation alternator does not have a short
circuit capacity.
The SHUNT excitation alternator is autoexcited with a R 250 voltage regulator.
STATOR : 12 wires (marking T1 to T12)
MAIN FIELD
T1
T7
T2
T8
T3
T9
T4
T10
T5
T11
T6
T12
Varistor
SHUNT SYSTEM
5+
Induced
6-
Field
75 mm
R 250
Voltage
ST4
External potentiometrer
for voltage adjusting
SPECIAL
KNEE
65Hz
LAM OFF
KNEE
57Hz
LAM OFF
Option
LAM OFF
8
7
50Hz
901
23
P2
Stability
KNEE
47.5Hz
78
P1
456
Slow fuse
250V 8 A
60Hz
LAM
OFF
2
3
13%
25%
OFF
13%
25%
LAM
FREQ. & L.A.M. CONFIG.
F1
STAB VOLT
140 mm
110 0V E+ E-
4 x holes 5.8 x
50 x 115 mm
Frequency selector 50 Hz
/ 60 Hz for U/F fonction
and LAM adjustement
Installation and maintenance
LEROY-SOMER
R250
4067 en - 2009.05 / b
A.V.R.
2 - R250 A.V.R.
2.1 - Characteristics
The threshhold position and LAM fonction
settings are done with the jumper.
- Storage: -55C; +85C
- Operation: -40C; +70C
- Voltage regulation: around 0,5 %.
- Supply range/voltage detection 85 to 139 V
(50/60Hz).
- Rapid response time (500 ms) for a
transient voltage variation amplitude of
20 %.
- Voltage setting P1.
- Stability setting P2.
- Power supply protected by 8 A fuse,
replacement product: Ferraz-Shawmut
T084013T fast-blow fuse, 8 A FA 250 V,
breaking capacity 30 kA.
2.2 - U/F Fonction and LAM
The threshold position (50 Hz - 60 Hz) to
action the U/F fonction as well as the LAM
setting type is selected using the
potentionmeter.
50Hz
KNEE
47.5Hz
LAM OFF
KNEE
57Hz
LAM OFF
78
65Hz
901
LAM
OFF
13%
23
KNEE
456
SPECIAL
LAM OFF
3
4
60Hz
25%
OFF
13%
25%
LAM
WARNING: The jumper settings must
correspond to the rated operating
frequency (see the nameplate on the
alternator).
Risk of destruction for the alternator.
Operating at 50 Hz: (U/F gradient)
0: threshold at 48 Hz without LAM for impacts
between 30 and 40% of the rated load.
1: threshold at 48 Hz with LAM 13% for
impacts between 40 and 70% of the rated
load.
2: threshold at 48 Hz with LAM 25% for
impacts > 70% of the rated load.
Operating at 60 Hz: (U/F gradient)
3: threshold at 58 Hz without LAM for impacts
between 30 and 40% of the rated load.
4: threshold at 58Hz with LAM 13% for
impacts 40 and 70% of the rated load.
5: threshold at 58Hz with LAM 25% for
impacts > 70% of the rated load.
Specific operating
6: threshold at 57Hz without LAM for speed
variations at a steady state > 2 Hz
7: threshold at 65Hz without LAM for variable
speed and tractelec / gearlec (U/F
gradient).
8: special: the factory setting 48Hz 2U/F
gradient ; a special programme is possible
on request. This programme must be
specified before ordering, during the project
study.
9: threshold at 47.5 Hz without LAM for
speed variations at a steady state > 2 Hz.
For hydraulic applications, it is advisable to
select:
- position 0 for 50 Hz
- position 3 for 60 Hz
LEROY-SOMER
Installation and maintenance
4067 en - 2009.05 / b
R250
A.V.R.
2.3 - R250 A.V.R. option
Potentiometer for voltage setting, 1000 W /
0,5 W min: setting range 5 %.
- Remove the ST4 jumper.
It is advised to use the LAM at 25% for load
impacts > at 70% of the genset rated power.
Voltage
Voltage
UN
0,85 UN
For wiring up the external potentiometer;
the earth wires must be isolated as
well as the potentiometer terminals
(wires at the same voltage as the power).
2.4 - LAM characteristics (Load
Acceptance Module)
2.4.1 - Voltage drop
The LAM system is integrated in the A.V.R.
It is active as standard. It can be adjusted to
13% or 25%.
- Role of the LAM (Load Adjustment
Module):
On application of a load, the rotation speed
of the generator set decreases. When it
passes below the preset frequency
threshold, the LAM causes the voltage to
drop by approximately 13% or 25% and
consequently the amount of active load
applied is reduced by approximately 25% to
50%, until the speed reaches its rated value
again.
Hence the LAM can be used either to
reduce the speed variation (frequency) and
its duration for a given applied load, or to
increase the applied load possible for one
speed variation (turbo-charged engines).
To avoid voltage oscillations, the trip
threshold for the LAM function should be
set approximately 2 Hz below the lowest
frequency in steady state.
U/f
LAM
48 or 58 Hz
ST3
fC
50 or 60 Hz
fN
2.4.2 - Gradual voltage return function
During load impacts, the function helps the
genset to return to its rated speed faster
thanks to a gradual increase in voltage
according to the following principles:
- if the speed drops between 46 Hz and 50 Hz,
the rated voltage follows a fast gradient as it
is restored.
- if the speed drops below 46 Hz, since the
engine needs more help, the voltage follows
a slow gradient as it returns to the reference
value.
U
Drop N < 46 Hz
Drop N > 46 Hz
Time
Installation and maintenance
LEROY-SOMER
R250
4067 en - 2009.05 / b
A.V.R.
2.5 - Typical effects of the LAM with
a diesel engine or without a LAM
(U/F only)
2.5.1 - Voltage
Transient voltage drop
UN
0,9
(U/f)
without LAM
with
LAM
0,8
1s
Time
2s
3s
2.5.2 - Frequency
Max speed drop
fN
with
LAM
0,9
without
LAM
0,8
1s
2s
Time
3s
2.5.3 - Power
Load on
shaft (kW)
LAM
Load variation
Shedding due to "LAM"
1s
2s
Time
3s
LEROY-SOMER
Installation and maintenance
R250
4067 en - 2009.05 / b
A.V.R.
3 - INSTALLATION COMMISSIONING
3.1 - Electrical checks on the AVR
- Check that all connections have been
made properly as shown in the attached
wiring diagram.
- Check that the position of the jumper
corresponds to the operating frequency.
- Check whether the ST4 jumper or the
remote adjustment potentiometer have
been connected.
3.2.2 - Special type of use
WARNING
Excitation circuit E+, E- must not be left
open when the machine is running:
A.V.R. damage will occur.
3.2.2.1 - R250 field weakening (SHUNT)
The different settings made during the
trial are to be done by qualified personnel.
Respecting the load speed specified on
the nameplate is vital in order to start a
settings procedure. After operational
testing, replace all access panels or
covers.
The only possible settings on the
machine are to be done with the A.V.R.
110
0V
E+
E-
3.2 - Settings
The exciter is switched off by disconnecting
the A.V.R. power supply (1 wire - 0 or 110V).
Contact rating: 16A - 250V AC
Do not reclose the power supply until the
voltage has reached a value 15% of the
rated voltage (approximately 5 seconds
after opening)
3.2.2.2 - R250 field forcing
(400V - 10A)
Initial potentiometer positions
- voltage setting potentiometer P1 for the
A.V.R.: full left
- remote voltage setting potentiometer: in
the middle.
Operate the alternator at its rated speed: if
the voltage does not rise it is necessary to
re-magnatise the magnetic circuit.
- slowly adjust the voltage potentiometer of
the A.V.R. P1 until the output voltage reaches
its rated value.
- Stability setting with P2.
110
0V
E+
E-
3.2.1 - R250 settings (SHUNT system)
Diode
Battery (B Volt)
Excitation Inducer
The battery must be isolated from the
mass.
Exciter field may be at line potential.
8
LEROY-SOMER
Installation and maintenance
R250
4067 en - 2009.05 / b
A.V.R.
3.3 - Electrical faults
Fault
Action
Connect a new battery
No voltage at of 4 to 12 volts to
no load on
terminals E- and E+
start-up
respecting the polarity
for 2 to 3 seconds
Voltage too
low
Effect
- Lack of residual magnetism
The alternator starts up but its
voltage disappears when the
battery is removed
- Faulty A.V.R.
- Exciter field short-circuited
- Short-circuit in the main field. Check the
resistance
The alternator starts up but its
voltage does not reach the rated
value when the battery is
removed.
Correct speed
Check the drive speed
Speed too low
Voltage too
high
Adjust A.V.R.
potentiometer
Voltage
oscillations
Adjust A.V.R. stability
potentiometer
Voltage
correct at no
load and too
low when on
load (*)
Run at no load and
check the voltage
between E+ and E- on
the A.V.R.
Check/cause
The alternator starts up and its
voltage is still correct when the
battery is removed.
Adjustment ineffective
- Check the connection of the voltage
reference to the A.V.R.
- Faulty diodes
- Induced short circuit
Check the A.V.R. connections (A.V.R. may
be faulty)
- Field windings short-circuited
- Rotating diodes burnt out
- Main field winding short-circuited
- Check the resistance
Increase the drive speed
(Do not touch the A.V.R. pot (P1) before
returning to the correct speed.)
- Faulty A.V.R.
- 1 faulty diode
- Check the speed: possibility of cyclic
irregularity
- Loose terminals
- Faulty A.V.R.
- Speed too low on load
(or U/F gradient set too high)
- Check the speed (or U/F gradient set too
high)
- Faulty rotating diodes
- Short-circuit in the main field. Check the
resistance
- Faulty induced excitaion
(*) Warning: For single-phase operation, check that the sensing wires coming from the A.V.R. are correctly connected to
the operating terminals (see the alternator manual).
Voltage
disappears
during
operation
Check the A.V.R., the
surge suppressor, the
rotating diodes and
replace any defective
components
- Exciter winding open circuit
The voltage does not return to the - Faulty induced excitation
rated value
- Faulty A.V.R.
- Main field open circuit or short-circuited
Warning: after setting-up or troubleshooting, replace all access panels or
covers.
Installation and maintenance
LEROY-SOMER
R250
A.V.R.
4 - SPARE PARTS
4.1 - Designation
Description
A.V.R.
Type
R 250
Code
AEM 110 RE 019
4.2 - Technical support service
Our technical support service will be pleased
to help you with any information needed.
For replacement part orders, it is necessary
to indicate the type and the code number of
the A.V.R.
Please contact your usual correspondant.
An extensive network of service centres is
available to rapidly supply any necessary
parts.
In order to ensure the correct operation and
safety of our machines, we strongly
recommend that original manufacturers
spare parts are used.
Failure to do so, will discharge the
manufacturer from liabilty in the case of
damage.
10
4067 en - 2009.05 / b
LEROY-SOMER
Installation and maintenance
R250
4067 en - 2009.05 / b
A.V.R.
11
MOTEURS LEROY-SOMER 16015 ANGOULME CEDEX - FRANCE
338 567 258 RCS ANGOULME
S.A. au capital de 62 779 000
www.leroy-somer.com
