WEG AVR-A-OPT-06 User manual

Motors | Automation | Energy | Transmission & Distribution | Coatings
Automatic Voltage Regulator
AVR-A-OPT-06 400Hz
Regulador Automático de Tensión
AVR-A-OPT-06 400Hz
Regulador Automático de Tensão
AVR-A-OPT-06 400Hz
Installation, Operation and Maintenance Manual
Manual de Instalación, Operación y Mantenimiento
Manual de Instalação, Operação e Manutenção

Installation, Operation and Maintenance Manual
Manual de Instalación, Operación y Mantenimiento
Manual de Instalação, Operação e Manutenção
Document # / Nº do documento: MWML00514
Model / Modelo: AVR-A-OPT-06 400HZ
Language / Idioma: English / Español / Português
Revision / Revisión / Revisão: 04
March /Marzo / Março, 2021

GENERAL INDEX / ÍNDICE GENERAL / ÍNDICE GERAL
Installation, Operation and Maintenance Manual
Page 7 - 26
Manual de Instalación, Operación y Mantenimiento
Páginas 27 - 46
Manual de Instalação, Operação e Manutenção
Páginas 47 - 65
Português Español English

www.weg.net
Automatic Voltage Regulator –AVR-A-OPT-06 400Hz l 7
FOREWORD
This manual may in no way be reproduced, filed, or transmitted through any type of media, whether it be electronically, by
printing, phonographically or any other audiovisual means without prior consent from WEG. Infringement is subject to
prosecution under the law.
Due to the continuous improvement of WEG products, the present manual may be modified and/or updated without prior
notice which may result in new revisions of the installation and maintenance manuals for the same product.
WEG reserves itself the right not to update automatically the information included in this manual. However, customers may
at any time request any updated version of the manual, which will be supplied to them free of charge.
If requested, WEG can supply an extra copy of this manual. The equipment serial number and model should be informed
by the customer, when making the request.
ATTENTION
1. It is imperative to follow the procedures in this manual for the warranty to be valid;
2. The procedures for installation, operation, and maintenance of this equipment should be done by
qualified people.
NOTES
1. Reproduction of information in this manual, in whole or in part, is permitted provided that the source
is quoted;
2. If this manual is lost, a copy in electronic format may be obtained by contacting www.weg.net or
another printed copy may be requested from WEG.
WEG EQUIPAMENTOS ELÉTRICOS S.A.

www.weg.net
Automatic Voltage Regulator –AVR-A-OPT-06 400Hz l 9
INDEX
1SAFETY INFORMATION..............................................................................................11
2STORAGE AND TRANSPORT.....................................................................................11
3INTRODUCTION...........................................................................................................11
4TECHNICAL CHARACTERISTICS ..............................................................................12
4.1 NOMENCLATURE FOR REGULATORS..........................................................................................13
4.2 PROTECTIONS –U/F OPERATION.................................................................................................14
4.3 BLOCK DIAGRAM ............................................................................................................................14
5PROTECTION FUSE ....................................................................................................15
6STANDARDS................................................................................................................16
7IDENTIFICATION TAG.................................................................................................16
8TRIMPOT FUNCTIONS ................................................................................................17
9CONNECTION DIAGRAMS..........................................................................................17
9.1 ALTERNATOR CONNECTION WITHOUT AUXILIARY COIL..........................................................17
9.2 ALTERNATOR CONNECTION WITH AUXILIARY COIL..................................................................18
10INTERNAL CONNECTION DIAGRAM.........................................................................20
11DIMENSIONS................................................................................................................20
12FIRST USE....................................................................................................................21
12.1 DESCRIPTION OF THE CONNECTION TERMINALS.....................................................................21
12.2 STEPS FOR CONNECTION.............................................................................................................21
13TURNING OFF..............................................................................................................21
14DIAGRAMS FOR TESTING WITHOUT A ALTERNATOR...........................................22
15TROUBLES, CAUSES AND CORRECTIVE ACTION..................................................24
16PREVENTIVE MAINTENANCE ....................................................................................24
17WARRANTY .................................................................................................................24

www.weg.net
Automatic Voltage Regulator –AVR-A-OPT-06 400Hz l 11
1 SAFETY INFORMATION
To guarantee the safety of the operators, the correct installation and proper operation of the equipment, the following
precautions must be taken:
Installation and maintenance services should be performed only by qualified personnel, using appropriate equipment.
The product instruction manual and specific product documentation must always be consulted before proceeding with its
installation, handling, and parameter setting.
Adequate precautions should be taken to avoid drops, knocks, and/or risks to the operators and the equipment.
Do not touch inlet and outlet connections, and always keep them isolated from the rest of the panel command circuit,
except when otherwise instructed.
Always disconnect the main power supply and wait for the alternator to come to a complete stop, before touching any
electrical component associated with the equipment including the control connectors. Do not touch the input and output
connectors since high voltages may be present even after the power has been switched off and keep them isolated from
the rest of the principal command circuit of the alternator.
The equipment’s electronic boards can have components that are sensitive to electrostatic discharges. Do not directly
touch components or connections. If this is absolutely necessary, then first touch the grounded metal body or use an
appropriately grounded bracelet.
2 STORAGE AND TRANSPORT
If the alternator needs to be stored for a short period of time before its installation and/or start-up, the following measures
should be taken:
The regulator must remain in its original package or in a similar package which provides the same safety conditions
against mechanical damages, excessive temperature and humidity so as to avoid rusting of contacts and metallic parts,
damages to integrated circuits or any other damage arising from improper storage;
Properly packaged, the regulator must be kept in a dry and well-ventilated area away from direct sunlight, rain, wind and
other adverse weather conditions in order to ensure the preservation of its operational functions.
Failure to comply with the above mentioned recommendations could exempt the supplier of the equipment from any
responsibilities and liabilities from any resulting damages as well as voiding the warranty on the equipment or damaged
part.
3 INTRODUCTION
The AVR-A-OPT-06 automatic analog voltage regulators are compact products featuring high reliability and low price,
which were designed with state-of-the-art technology for voltage regulation of brushless synchronous alternators.
Their control and regulation circuits use semiconductors and integrated circuits duly tested following the most demanding
quality requirements. It doesn’t utilize mechanical components for field flashing since its system is completely static. It is
encapsulated in resin suitable for maritime environment and withstands vibrations up to 5Gs. It is fitted with internal voltage
adjustment by trimpot and external by potentiometer.
The stability of the system is controlled through trimpots that adjust proportional and integral gains, allowing a wide
adjustment range and permitting the operation of the regulator with several types of alternators, covering a large number
of dynamic characteristics.
It features under frequency protection (U/F limiter which does not permit that the alternator to be excited during the turn off
procedures or with a rotation decrease), whose intervention point is adjustable by trimpot, and the rated operation
frequency is 400HZ.

www.weg.net
12 l Automatic Voltage Regulator –AVR-A-OPT-06 400Hz
4 TECHNICAL CHARACTERISTICS
Table 4.1: Mechanical and electrical characteristics
Characteristics
AVR-A-OPT-06 7A AM/220M
Nominal field current
7A
Nominal current with forced ventilation
9A
Peak current (max. 1min)
9A
Protection fuse for power supply
5A
Sensing (selected via jumper cable) (VRal)
160-300 or
320-600 Vac
External voltage control
Through 5KΩ/3W potentiometer
Sensing power supply
Single Phase
Power Supply Range (Val)
170 to 300Vac
Power supply current
Single Phase
Rectifier gain ratio (Kc)
0,45
Maximum field voltage (Vf)
76,5 Vdc (Val mín)
112,5 Vdc (Val máx)
Field Resistance @ 20ºC
6 up 50Ω
Static Regulation
0,5%
Adjustable dynamic response
8 to 500ms
Operation Frequency
400Hz
Sub frequency protection (U/F)
Adjustable via trimpot
Internal percent adjustment of voltage
Adjustable via trimpot, for the complete range of Voltage VRal
External percent adjustment of voltage
±15% de VRal.
Temperature
-40° to + 60ºC
EMI Suppression
EMI filter
Approximate Weight
480g
LED Indicators
None
Protection for Excitation Over current
Not applicable
Analog Input +/-9Vdc
Not applicable
Analog Input 0 to 10Vdc
Not applicable
Digital Input
Not applicable
Parallel operation
Not applicable
Torque specifications for fixing
1.8 N*m

www.weg.net
Automatic Voltage Regulator –AVR-A-OPT-06 400Hz l 13
4.1 NOMENCLATURE FOR REGULATORS
AVR-A-OPT-06 7A AM/220M S/PAR 400HZ
Operation Frequency.
S/PAR: Without Parallel Operation.
Rated supply voltage.
M: Single Phase.
Sensing Class
A= 160 to 300V or 320 to 600V.
Nominal field current.
Factory defined sequence.
Voltage Regulators.

www.weg.net
14 l Automatic Voltage Regulator –AVR-A-OPT-06 400Hz
4.2 PROTECTIONS –U/F OPERATION
Erro! Fonte de referência não encontrada.Figure 4.1 shows the curves for voltage variation as a function of frequency
variation. For nominal frequency operation, U/F is disabled. When rotation decreases (for ex. when shutting down),
excitation diminishes, reducing the output voltage of the alternator. The drop follows a straight line of 7,5 V/HZ.
The U/F trimpot determines the trigger point of the U/F mode, which can be the nominal frequency (Fn) down to 1/3 of Fn,
and leaves the factory adjusted to 10% below Fn. For operation in 400Hz it is adjusted to 360Hz (see Figure 4.1). These
values can be altered according to the needs of each application.
Figure 4.1: Actuation point for U/F protection
ATTENTION
1. Do not set the U/F protection below 20 % of the rated alternator frequency. The configuration should be done
according to Figure 4.1 to avoid problems when shutting down.
2. The frequency limited by U/F is the frequency of the waveform that is at the power supply input of the
regulator and not at the sensing input (output voltage of the alternator).
4.3 BLOCK DIAGRAM
The structure of the regulator is shown on Figure 4.2.
Figure 4.2: Block diagram of the AVR-A-OPT-06 voltage regulator

www.weg.net
Automatic Voltage Regulator –AVR-A-OPT-06 400Hz l 15
The principle of operation is based on the comparison of the RMS sensing voltage with the reference voltage, adjusted by
the sum of the values of Vad trimpot and the external trimpot. The error is processed by the sensing loop and its value
determines the firing angle of the thyristor, which can vary from 0 to 180°, thus controlling the output voltage of the
alternator. With zero degree firing, the result is zero volts on the output side of the rectifier, and 180 degrees results in
maximum output of the half wave rectifier.
Generation starts through the alternator residual voltage. After the voltage has reached approximately 10% of the nominal
value, the regulator controls the voltage of the alternator, taking it through an initial ramp up of approximately 1 second
until reaching nominal voltage. From this point on, the sensing loop will maintain the output voltage of the alternator
constant within the adjusted value.
Figure 4.3 shows the control diagram of the AVR-A-OPT-06 voltage regulator. The control it’s based in ST1A, shown by
IEEE, and applied to systems where the rectifier is fed from the output of the alternator (Type ST –Static Excitation
Systems), directly or through auxiliary coils or through a transformer.
Figure 4.3: Control diagram AVR-A-OPT-06
5 PROTECTION FUSE
The fuse is used to limit the input current supply in order to extinguish the current in case of failure, avoiding major
problems. The AVR-A-OPT-06 regulator possesses a rectifier that controls the field voltage of the alternator. For the
maximum field voltage, the supplied current at input “3” is half of the field current, and the maximum current of the fuse
should be a little more than half of the current supplied by the regulator. Listed below are some of the fuse characteristics:
Recommended manufacturer: LittelFuse
Characteristics: Fast action fuse.
Dimensions: 5x20 mm.
Current/Voltage: 5A/250V.
Time for opening (to blow):
Table 5.1: Fuse opening time
Fuse opening time
% of maximum current
Opening time
110%
4 hours (minimum)
135%
Max. 1 hour
200%
Max. 1 second

www.weg.net
16 l Automatic Voltage Regulator –AVR-A-OPT-06 400Hz
6 STANDARDS
The AVR-A-OPT-06 voltage regulators comply with the following international standards:
Table 6.1: Standards
Standard
Level
Performance
Criteria
IEC 61000-4-5 –Surge immunity test
Asymmetrical: 4kV Symmetrical: 4kV
B
IEC 61000-4-4 - Electrical fast transient/burst immunity
test
5Khz repetitions, +/- 2kV peak voltage
B
IEC 61000-4-3 –Radiated, radio-frequency,
electromagnetic field immunity test
10V/m field for a frequency range from 80MHz to 1GHz. A
10% maximum variation is allowed at the output voltage for a
radiated frequency between 160MHz and 280MHz. For all
other frequencies the equipment doesn’t present variations
A
IEC 61000-4-2 - Electrostatic discharge immunity test
Contact: 4kV load;
Through the air: 8kV load.
B
IEC 61000-4-11 - Voltage dips, short interruptions and
voltage variations immunity tests
Dip f 30db to 95db dips
C and B
IEC 61000-4-6 -Immunity to conducted disturbances,
induced by radio-frequency fields
10V amplitude, 150kHz to 80Mhz
A
7 IDENTIFICATION TAG
Model:
Power Input
Operating Frequency
Excitation Voltage
Excitation Current
Sensing Voltage
Figure 7.1: Identification tag
The above example shows the main characteristics described in the nameplate/ID tag that needs to be checked before installation.
NOTE
1. The ID tag is affixed on the backside of the regulator, and to the Installation Guide.

www.weg.net
Automatic Voltage Regulator –AVR-A-OPT-06 400Hz l 17
8 TRIMPOT FUNCTIONS
Vad: Voltage adjustments. Turning clockwise increases voltage;
Stb: Stability adjustments. Turning clockwise slows down stability response
U/F: U/F limiter. Turning clockwise increases the U/F range, counterclockwise it diminishes;
NOTE
* A potentiometer for fine adjustments of voltage (5kΩ/3W) can be connected on terminals.
* The U/F and Stb trimpots were preseted and sealed, but if adjustments are required, They can be
performed according to the procedures described in this manual.
* Once the sub-frequency protection is adjusted, when changing the operating frequency, the sub-
frequency protection trimpot must be readjusted.
Figure 8.1: Trimpots function
9 CONNECTION DIAGRAMS
9.1 ALTERNATOR CONNECTION WITHOUT AUXILIARY COIL
N
R
S
T
Exciter
field
F-
F+
Alternator
Potentiometer for
external voltage
regulation¹ ²
(5kΩ/3W)
AVR-A-OPT-06
F+
F-
E1
E2
3
E3/4
ON/OFF
key ³
Alternator Voltage
from 85 to 140 Vca
from 160 to 300 Vca
Faster answer Slower answer
Decrease Increase
reactives reactives
Frequency Frequency
decreases increases
Voltage Voltage
decreases increases

www.weg.net
18 l Automatic Voltage Regulator –AVR-A-OPT-06 400Hz
9.2 ALTERNATOR CONNECTION WITH AUXILIARY COIL
N
R
S
T
Exciter
field
F-
F+
Alternator
Potentiometer for
external voltage
regulation¹ ² (5kΩ/3W)
AVR-A-OPT-06
F+
F-
E1
E2
3
E3/4
ON/OFF
key³
Alternator Voltage
from 170 to 280 Vca
from 320 to 600 Vca
Alternator Voltage
from 85 to 140 Vca
from 160 to 300 Vca
N
R
S
T
Exciter
field
F-
F+
Alternator
Potentiometer for
external voltage
regulation¹ ² ( 5kΩ/3W)
AVR-A-OPT-06
F+
F-
E1
E2
3
E3/4
ON/OFF
key³³
Auxiliary
coil

www.weg.net
Automatic Voltage Regulator –AVR-A-OPT-06 400Hz l 19
¹ Item not supplied by WEG;
² if there is no Potentiometer connected, keep terminals short circuited;
³ 10A/250Vac switch to turn ON /OFF the regulator (Item not supplied by WEG)
ATTENTION
1. Before connecting the regulator to the alternator, verify in the installation manual, the reference nominal
voltage.
2. When using an auxiliary coil, the connector E3/4, reference of the regulator circuit, should be the
mandatory common point between the coil and the alternator
3. If the reference voltage is not equal to the output voltage of the alternator, do not make the connections
without consulting the service department.
Alternator Voltage
from 170 to 280 Vca
from 320 to 600 Vca
N
R
S
T
Exciter
field
F-
F+
Alternator
Potentiometer for
external voltage
regulation¹ ² (5kΩ/3W)
AVR-A-OPT-06
F+
F-
E1
E2
3
E3/4
ON/OFF
key³
Auxiliary
coil

www.weg.net
20 l Automatic Voltage Regulator –AVR-A-OPT-06 400Hz
10 INTERNAL CONNECTION DIAGRAM
Use a DC isolated power supply if there is a need to pre-excite the excitation field. As an option, a diode can be placed
after the F- terminal or an isolation transformer can be placed between terminals 3 and E3/4 with the alternator phases of
the alternator as a means of protection against short circuits.
11 DIMENSIONS
F –Protection Fuse