Nidec LEROY-SOMER R221 Mode d’emploi
E+ E-
0V
110
R221
VOLT
OPEN FOR 60 Hz STAB
POT 1K
R221
AVR
Installation and maintenance
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Electric Power Generation Installation and maintenance
R221
AVR
5035 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
qualied technician.
Our technical support service will be pleased
to provide any additional information you
may require.
The various operations described in this
manual are accompanied by
recommendations or symbols to alert the
user to potential risks of accidents. It is vital
that you understand and take notice of the
following warning symbols.
WARNING
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
maintenance of electrical and
mechanical components.
When the generator is driven at a
frequency below 28 Hz for more than 30
seconds with an analogue AVR, its AC
power supply must be disconnected.
WARNING
This AVR can be incorporated in a EC-
marked machine.
This manual is to be given to the end
user.
© 2024 Moteurs Leroy-Somer SAS
Share Capital: 32,239,235 €, RCS Angoulême
338 567 258.
We reserve the right to modify the characteristics
of this product at any time in order to incorporate
the latest technological developments. The
information contained in this document may
therefore be changed without notice.
This document may not be reproduced in any
form without prior authorization.
All brands and models have been registered and
patents applied for.
This manual concerns the alternator AVR which you have just purchased.
We wish to draw your attention to the contents of this maintenance manual.
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Electric Power Generation Installation and maintenance
R221
AVR
5035 en -
CONTENTS
1 - POWER SUPPLY ...............................................................................................................4
1.1 - SHUNT excitation system ............................................................................................4
2 - R221 AVR ...........................................................................................................................4
2.1 - Characteristics .............................................................................................................4
2.2 - AVR options..................................................................................................................4
3 - INSTALLATION - COMMISSIONING .................................................................................5
3.1 - Electrical checks on the AVR ........................................................................................5
3.2 - Settings........................................................................................................................5
3.3 - Electrical faults.............................................................................................................6
4 - SPARE PARTS...................................................................................................................7
4.1 - Designation..................................................................................................................7
4.2 - Technical support service.............................................................................................7
Disposal and recycling instructions
WARNING
The AVR R221 is dedicated for the alternators LSA40 and LSA423 single phase
(50Hz/60Hz). It is particularly recommended for applications in which the alternator’s
voltage dierence between no-load operation and load operation is out of ISO8528-3
class G2.
The R221 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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Electric Power Generation
124 mm
85 mm
T1 T2 T3
T4 T5 T6
5+ 6-
T7 T8 T9
T10 T11 T12
E+ E-
0V
110
R221
P1
P2
ST3
VOLT
OPEN FOR 60 Hz STAB
POT 1K
ST4
50 Hz 60 Hz
Installation and maintenance
R221
AVR
5035 en -
1 - POWER SUPPLY
1.1 - SHUNT excitation system
The alternator with Shunt excitation is self-
excited with an R221 voltage regulator.
The regulator monitors the exciter excitation
current as a function of the alternator output
voltage. Very simple in design, the alternator
with shunt excitation has no sustaining
short-circuit capacity.
2 - R221 AVR
2.1 - Characteristics
- Storage: -55°C ; +85°C
- Operation: -40°C ; +65°C
- Voltage regulation: ± 0.5%
- Voltage supply/sensing range 85 to 139 V
(50/60 Hz)
- 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, slow-
blow action (tolerates 10 A for 10 s)
The fuse is impregnated in the resin,
therefore it can not be replaced.
- Frequency: 50 Hz with ST3 jumper - 60 Hz
without ST3 jumper.
- The size of the screwdriver tip used to
adjust the potentiometer is 2.5 mm.
2.2 - AVR options
Potentiometer for remote voltage
adjustment, 1000 Ω / 0.5 W min: adjustment
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).
SHUNT SYSTEM
MAIN FIELD STATOR : 12 wires (marked T1 to T12)
Armature
Field
Voltage
Option
Stability
Frequency
Potentiometer for remote
voltage adjustment
Varistor
2 x holes Ø 5.8 x 109 mm
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Electric Power Generation Installation and maintenance
R221
AVR
5035 en -
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 ST3 frequency selection
jumper is on the correct frequency setting.
- Check whether the ST4 jumper or the
remote adjustment potentiometer have
been connected.
3.2 - Settings
The machine is tested and set at the
factory. When rst used with no load,
make sure that the drive speed is correct
and stable (see the nameplate). After
operational testing, replace all access
panels or covers.
The only possible adjustments to the
machine should be made on the AVR.
3.2.1 - R 221 setting (SHUNT system)
Initial potentiometer settings
- P1 potentiometer (AVR voltage
adjustment): fully anti-clockwise.
- Remote voltage adjustment potentiometer:
centre position.
Run the alternator at its rated speed. If the
voltage does not increase, the magnetic
circuit should be remagnetized (see section
3.3).
- Turn the AVR voltage adjustment
potentiometer P1 slowly until the output
voltage rated value is obtained.
- Adjust the stability setting using P2.
Clockwise: increase the rapidity.
Anti-clockwise: decrease the rapidity.
3.2.2 - Special type of use
Excitation circuit E+, E- must not be left
open when the machine is running : AVR
damage will occur.
3.2.2.1 - R221 eld weakening (SHUNT)
The exciter is switched o by disconnecting
the AVR power supply.
Contact rating : 16A - 250V AC.
The power supply contactor must only be
closed when the alternator is not being
driven.
3.2.2.2 - R221 eld forcing
Battery must be isolated from the earth.
Exciter eld may be at line potential.
WARNING
E+ E-
0V
110
VOLT POT 1K
Battery (B Volt)
+
-
t
(400V - 10A) Diode
E+ E-
0V
110
Exciter field
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Electric Power Generation Installation and maintenance
R221
AVR
5035 en -
3.3 - Electrical faults
Fault Action Eect 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 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 eld 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 eld coil short-circuited (check
the resistance)
Speed too low
Increase the drive speed (do not touch the
AVR voltage setting before running at the
correct speed)
Voltage too
high
Adjust AVR voltage
potentiometer Adjustment ineective - Faulty AVR
- 1 faulty diode
Voltage
oscillations
Adjust AVR stability
potentiometer
- Check the speed : possibility of cyclic
irregularity
- Loose connections
- Faulty AVR
- Speed too low when on load (or U/F bend
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 AVR
- Check the speed (or U/F bend set too
high)
- Faulty rotating diodes
- Short-circuit in the revolving eld coil
(check the resistance)
- Faulty exciter armature (check the
resistance)
(*) Caution : For single-phase operation, check that the sensing wires coming from the AVR are correctly connected to
the operating terminals.
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 eld coil open circuit or
short-circuited
Warning: after operational testing, replace all access panels or covers.
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Electric Power Generation Installation and maintenance
R221
AVR
5035 en -
4 - SPARE PARTS
4.1 - Designation
Description Type Code
AVR R221 AEM 110 RE 042
4.2 - Technical support service
Our technical support service will be
pleased to provide any additional
information you may require.
For all spare parts orders or technical
support requests, send your request to
service.epg@leroy-somer.com or your
nearest contact, whom you will nd at
www.lrsm.co/support indicating the type
and the code number of the AVR.
To ensure that our products operate correctly
and safely, we recommend the use of
original manufacturer spare parts.
In the event of failure to comply with this
advice, the manufacturer cannot be held
responsible for any damage.
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Electric Power Generation Installation and maintenance
R221
AVR
5035 en -
Disposal and recycling instructions
We are committed to limiting the
environmental impact of our activity. We
continuously monitor our production
processes, material sourcing and product
design to improve recyclability and minimise
our environmental footprint.
These instructions are for information
purposes only. It is the user’s responsibility
to comply with local legislation regarding
product disposal and recycling.
Waste & hazardous materials
The following components and materials
require special treatment and must be
separated from the alternator before the
recycling process:
- electronic materials found in the terminal
box, including the automatic voltage
regulator (198), current transformers (176),
interference suppression module and other
semi-conductors.
- diode bridge (343) and surge suppressor
(347), found on the alternator rotor.
- major plastic components, such as the
terminal box structure on some products.
These components are usually marked with
information concerning the type of plastic.
All materials listed above need special
treatment to separate waste from
reclaimable materials and should be
entrusted to specialist recycling companies.
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Electric Power Generation Installation and maintenance
R221
AVR
5035 en -
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Electric Power Generation Installation and maintenance
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AVR
5035 en -
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