Emerson Leroy Somer R250 Instruction Manual

R250
VOLT
FREQ. & L.A.M. CONFIG.
STAB
110
E+ E-
0V
0
9
8
7
6
5
4
3
2
1
o
1
2
3
5
6
7
9
8
4
60Hz
65Hz
57Hz
47.5Hz
50Hz
KNEE
SPECIAL
LAM
OFF
OFF
13%
13%
25%
25%
LAM
KNEE
KNEE
LAM OFF
LAM OFF
LAM OFF
A.V.R.
R250
Installation and maintenance

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R250
A.V.R.
4067 en -
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 recommen-
dations 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.
All servicing or repair operations
performed on the AVR should be
undertaken by personnel trained in the
commissioning, servicing and main-
tenance of electrical and mechanical
components.
When the generator is driven at a
frequency less than 28 Hz for more than
30 seconds with an analogic regulator,
the AC power must be disconnected.
WARNING
This A.V.R. can be incorporated in a
machine marked C.E.
This manual is be given to the end user.
© - We reserve the right to modify the
characteristics of its products at any time in
order to incorporate the latest technological
developments. The informa-tion 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.
WARNING
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.

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A.V.R.
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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 .......................................................................................................6
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
Disposal and recycling instructions
The R250 is an IP00 product. It must be installed inside a unit so that this unit’s cover can
provide IP20 minimum total protection (it must only be installed on our alternators in the
appropriate location so that when viewed externally, it has a higher degree of protection than
IP20).

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1 - SUPPLY
1.1 - SHUNT excitation system
The SHUNT excitation alternator is auto-
excited with a R250 voltage regulator.
The regulator controls the excitation current
according to the alternator’s output voltage.
With a very simple conception, the SHUNT
excitation alternator does not have a short
circuit capacity.
4 x holes Ø 5.8 x
50 x 115 mm
140 mm
75 mm
SHUNT SYSTEM
Field
Induced
T1 T2 T3
T4 T5 T6
Varistor
5+ 6-
T7 T8 T9
T10 T11 T12
STATOR : 12 wires (marking T1 to T12)
MAIN FIELD
R250
VOLT
FREQ. & L.A.M. CONFIG.
STAB
F1
Slow fuse
250V 8 A
P1
Voltage
P2
Stability
110
E+ E-
0V
0
9
8
7
6
5
4
3
2
1
o
1
2
3
5
6
7
9
8
4
60Hz
65Hz
57Hz
47.5Hz
50Hz
KNEE
SPECIAL
LAM
OFF
OFF
13%
13%
25%
25%
LAM
KNEE
KNEE
LAM OFF
LAM OFF
LAM OFF
External potentiometrer
for voltage adjusting
ST4
Option
Frequency selector 50 Hz
/ 60 Hz for U/F fonction
and LAM adjustement

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2 - R250 A.V.R.
2.1 - Characteristics
- Storage: -55°C; +85°C
- Operation: -40°C; +70°C
- 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.
WARNING: The jumper settings must
correspond to the rated operating
frequency (see the nameplate on the
alternator).
Risk of destruction for the alternator.
The threshhold position and LAM fonction
settings are done with the jumper.
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.
Specic 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
specied 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
0
9
8
7
6
5
4
3
2
1
o
1
2
3
5
6
7
9
8
4
60Hz
65Hz
57Hz
47.5Hz
50Hz
KNEE
SPECIAL
LAM
OFF
OFF
13%
13%
25%
25%
LAM
KNEE
KNEE
LAM OFF
LAM OFF
LAM OFF

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2.3 - R250 A.V.R. option
Potentiometer for voltage setting, 1000 W/
0,5 W min: setting range ± 5 %.
- Remove the ST4 jumper.
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.
It is advised to use the “LAM” at 25% for load
impacts > at 70% of the genset rated power.
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.
LAM
U
N
0
48 or 58 Hz
0,85 U N
Voltage
U/f
50 or 60 Hz
fC fN
Voltage
ST3
0
Time
Drop N < 46 Hz
U
Drop N > 46 Hz

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2.5 - Typical effects of the LAM with a
diesel engine or without a LAM (U/F
only)
2.5.1 - Voltage
2.5.2 - Frequency
2.5.3 - Power
U N
0
0,9
0,8
(U/f)
with
LAM Time
without LAM
1 s 2 s 3 s
Transient voltage drop
0,9
0,8
f N
Max speed drop
0
with
LAM
Time
without
LAM
1 s 2 s 3 s
01 s 2 s 3 s
Time
LAM
Load variation
Load on shaft (kW)
Shedding due to "LAM"

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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 - Settings
The different settings made during the
trial are to be done by qualied personnel.
Respecting the load speed specied 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.
3.2.1 - R250 settings (SHUNT system)
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.
3.2.2 - Special type of use
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 eld weakening (SHUNT)
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 eld forcing
The battery must be isolated from the
mass.
Exciter eld may be at line potential.
WARNING
E+
E-
0V 110
Battery (B Volt)
+
-
t
(400V - 10A)
Excitation Inducer
Diode
E+
E-
0V 110

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3.3 - 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 E- and E+
respecting the polarity
for 2 to 3 seconds
The alternator starts up and its
voltage is still correct when the
battery is removed.
- Lack of residual magnetism
The alternator starts up but its
voltage does not reach the rated
value when the battery is
removed.
- Check the connection of the voltage
reference to the A.V.R.
- Faulty diodes
- Induced short circuit
The alternator starts up but its
voltage disappears when the
battery is removed
- Faulty A.V.R.
- Exciter eld short-circuited
- Short-circuit in the main eld. Check the
resistance
Voltage too
low Check the drive speed
Correct speed
Check the A.V.R. connections (A.V.R. may
be faulty)
- Field windings short-circuited
- Rotating diodes burnt out
- Main eld winding short-circuited
- Check the resistance
Speed too low
Increase the drive speed
(Do not touch the A.V.R. pot (P1) before
returning to the correct speed.)
Voltage too
high
Adjust A.V.R.
potentiometer Adjustment ineffective - Faulty A.V.R. - 1 faulty diode
Voltage
oscillations
Adjust A.V.R. stability
potentiometer
- 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)
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 the speed (or U/F gradient set too
high)
- Faulty rotating diodes
- Short-circuit in the main eld. 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
The voltage does not return to the
rated value
- Exciter winding open circuit
- Faulty induced excitation
- Faulty A.V.R.
- Main eld open circuit or short-circuited
Warning: after setting-up or trouble-
shooting, replace all access panels or
covers.

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A.V.R.
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4 - SPARE PARTS
4.1 - Designation
Description Type Code
A.V.R. R250 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 manufacturer’s
spare parts are used.
Failure to do so, will discharge the
manufacturer from liabilty in the case of
damage.