PEGASUS TECHNOLOGY GRTD-TH3 User manual

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Street: Marechal Castelo Branco, 784
Centro Sul –Schroeder SC - Brazil
[phone]
MPBR[07-00002] Rev 04
Digital Voltage Regulator
GRTD-TH3
Installation, Operation and Maintenance
Manual

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Congratulations, you just purchased a high-quality product, read the instructions in this manual
carefully before installing the product. No part of this publication may be reproduced, stored in a
retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying,
recording or otherwise,withouttheprior writtenpermission of PEGASUSTECHNOLOGY. Offenders
will be subject to penalties provided by law.
This publication is subject to changes and / or updates that may result in further revisions of
the installation and operating manuals, in view of the continued improvement of PEGASUS
TECHNOLOGY products. PEGASUS TECHNOLOGY reserves the right not to automatically update
the information contained in these new revisions. However, at any time the customer may request
updated material that will be provided to you at no charge.
In order to spread and expand the market, PEGASUS TECHNOLOGY has acquired the
®GRAMEYER brand and with it all know-how, technology and quality of its production process
including simulations and equipment tests, our team is highly trained and qualified by engineers and
technicians capable of helping to solve any problem and doubt of our clients. This manual is always
supplied in printed form with the equipment.
This product has an interface to an IoT module, capable of transmitting information from the
generator.
* In the event of loss of the instruction manual, PEGASUS TECHNOLOGY may provide a separate copy, and if
necessary, additional information about the product. Requests can be answered, provided the serial number and model
of the equipment are informed.

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SAFETY INFORMATIONS
To ensure the safety of operators, correct installation of equipment and their preservation, the
following:
➢Only persons trained and authorized by the manufacturer are authorized to install this
equipment, as improper intervention by an unskilled person could cause damage to the
equipment and the generator;
➢Instruction manuals and the product identification label must always be observed before
installation,handling and parameterization;
➢Proper precautions should be taken against falls, physical shocks and / or safety risks to
operators and equipment;
➢Always disconnect the mains supply and wait for the machine to stop completely before
touching any electrical components associated with the equipment, this also includes the
control connectors. Do not touch the I/O connectors because high voltages may be
present even after power is disconnected and always keep them insulated from the rest
of the main generator control circuit. Check item screen printing symbology of this manual
to disconnect the equipment;
➢Observe the warning labels affixed to the equipment, "care tension" and "warm surface
care";
➢This equipament complies withIEC61010-1.
Do not touch the input and output connectors. And keep them always
isolated from the rest of the control circuit of the panel unless otherwise
advised.
Always disconnect the mains supply and wait for the machine to stop
completely before touching any electrical component associated with the
equipment, this also includes the connectors of commands.
Do not open the cover of the equipment without proper precautions, as
high be present even after disconnecting the power supply.
The electronic equipment cards may have components that are sensitive
to electrostatic discharge. Do not touch components or connectors
directly. If necessary, touch the grounded metal housing or proper
grounding.

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STORAGE INFORMATION
If the regulator needs to be stored for a short time before its installation and / or commissioning, the
following precautions must be taken:
➢The Regulator must be kept in its original packaging or packaging that meets the same safety
conditions against mechanical damage, excessive temperature and humidity to prevent
oxidation of contacts and metal parts, damage to integrated circuits;
➢The duly conditioned regulator must be stored in a dry, ventilated place where there is no
direct effect of the sun's rays, as well as rain, wind and other inclemencies, in order to
guarantee the maintenance of its functional characteristics;
➢After the regulator is properly packed and accommodated in such a way that it does not
absorb the vibrations and impacts suffered during transport, it will be able to be transported
by the different means.
➢Failure to comply with the above recommendations may void the supplier of the equipment
from any liability for the damage, as well as loss of warranty on the equipment or damaged
part.
Failure to comply with the above recommendations may exempt the
supplier any liability for consequential damages, and loss of warranty on
the equipment or damaged part.

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WHERE CAN THE EQUIPMENT BE INSTALLED?
The installation and/or commissioning of the equipment may be carried out in:
➢Generator connection box;
➢External panel near of the generator;
➢Any place protected from the environment near the generator;
➢This equipment is for internal use (IP00);
➢This equipment can’t be installed outdoors. Due to climatic conditions such as rain can
oxidize its terminals causing malfunction of the equipment and consequently malfunction
of the generator;
➢The installation of peripherals such as the extern potentiometer, switches and circuit
breakers must be installed near the equipment and in an easily accessible location;
➢The installation should be done in a closed metal enclosure (grounded or not) so that the
terminals are inaccessible where there is no opening that allows access to the equipment
and access must be done by means of a tool (Philips wrench, etc) remembering that the
terminals of the equipment should not be exposed and the peripherals installed in order
to comply with the IEC61010-1 standard;
➢This equipment can be installed in places that may be subject to vibration, heat, and
electromagnetic interface because it is designed to withstand such adverse conditions;
➢Generator connection diagrams vary according to generator type taking into account
generator voltage, excitation current, whether the generator is with or without auxiliary
coil, etc. All of these diagrams are clearly described in this manual.
Failure to comply with the above recommendations may exempt the
supplier any liability for consequential damages, and loss of warranty on
the equipment or damaged part.

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CONVENTIONS USED IN THE MANUAL
Some conventions regarding font types or formatting have been used in this manual to enable clear
and uncomplicated reading. The following are the main conventions used:
NOTE (upper case):Type (uppercase / lowercase) Notes and alerts represent important information
that should be observed by the operator or supervisor of the operation.
SUBJECT OF THE PAGE –At the edges of each page the reader can have a quick reference
of the main subject that is being dealt with in it, without it being necessary to use the indexes to
locate the desired information by simply browsing the manual.
Reference to headings and subheadings –References to headings and subheadings used
throughout the text to refer the reader to a more detailed topic on the subject or where the reader
can obtain the desired information contained in the manual are written in type Italic. Words or
expressions in a language other than current will also be written in Italic type.

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Summary
INTRODUCTION......................................................................................................................................................8
TECHNICAL FEATURES .......................................................................................................................................9
BLOCK DIAGRAM................................................................................................................................................10
REFERENCE......................................................................................................................................................11
VOLTAGE ADJUSTMENT VIA VAD POTENTIOMETER..............................................................................11
VOLTAGE ADJUSTMENT VIA ANALOG INPUT............................................................................................11
VOLTAGE ADJUSTMENT VIA DIGITAL INPUT.............................................................................................11
PI CONTROLLER ..............................................................................................................................................12
POWER CIRCUIT..............................................................................................................................................13
PROTECTIONS..................................................................................................................................................14
GENERATOR OVERVOLTAGE PROTECTION.........................................................................................15
EXCITATION OVERCURRENT PROTECTION..........................................................................................15
ARMATURE OVERCURRENT PROTECTION...........................................................................................15
ROTATING DIODE FAULT...........................................................................................................................15
LIMITERS............................................................................................................................................................16
U/f LIMITER....................................................................................................................................................16
FIELD CURRENT LIMITER...........................................................................................................................17
LOSS OF SENSING VOLTAGE ...................................................................................................................17
ALARMS..............................................................................................................................................................18
MAXIMUM FIRING ANGLE...........................................................................................................................18
MICROCONTROLLER FAILURE.................................................................................................................18
VIRTUAL SWITCH.............................................................................................................................................18
PARALLEL OPERATION WITH REACTIVE COMPENSATION...................................................................18
PHISICAL PROTECTIONS...................................................................................................................................19
PROTECTION FUSE FOR EXCITATION FIELD............................................................................................19
FUNCTION TRIMPOTS.........................................................................................................................................20
IDENTIFICATION AND PURCHASE ORDER....................................................................................................20
IDENTIFICATION AND PURCHASE ORDER.................................................................................................20
HOW TO CONNECT TO THE GENERATOR.....................................................................................................21
DESCRIPTION OF GENERATOR CONNECTION TERMINALS..................................................................21
CONNECTION TO THE GENERATOR WITHOUT AUXILIARY WINDING.................................................22
CONNECTION TO THE GENERATOR OPERATING IN (160 to 300Vca)...............................................22
CONNECTION TO THE GENERATOR OPERATING IN (330 to 600Vca)...............................................23
CONNECTION TO THE GENERATOR WITH AUXILIARY WINDING .........................................................24
CONNECTION DIAGRAM FOR PARALLELISM OF GENERATORS..........................................................25
EQUIPMENTS SUPPLIED WITH THE REGULATOR (STANDARD KIT)....................................................25
FIRST REGULATOR INSTALLATION................................................................................................................26

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CONNECTION STEPS......................................................................................................................................26
NOTE: When the regulator is powered without any sensing voltage measurement, the regulator will not
excite the regulator, accusing the Lack Phase limiter.....................................................................................26
SHUTDOWN.......................................................................................................................................................26
BENCH TEST DIAGRAM..................................................................................................................................27
DIMENSIONAL......................................................................................................................................................28
DIMENSIONAL OF THE VOLTAGE REGULATOR (mm)..............................................................................28
MÓDULO DE CONECTIVIDADE IoT..................................................................................................................28
CREEN PRINTING SYMBOLOGY ......................................................................................................................29
FIRST USE?...........................................................................................................................................................29
DESCRIPTION OF TERMINALS AND CONNECTION CABLES ....................................................................30
SHUTDOWN...........................................................................................................................................................30
PREVENTIVE MAINTENANCE............................................................................................................................31
RISK REDUCTION................................................................................................................................................31
NOTES TO THE PERSON RESPONSIBLE FOR THE MAINTENANCE AND INSTALLATION SERVICE32
WARRANTY TERM...............................................................................................................................................32
PROBLEMS, CAUSES AND SOLUTIONS.........................................................................................................33

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INTRODUCTION
The GRTD-TH3 digital voltage regulator is a compact device with features similar to analog voltage
regulators, increasing the reliability and protections of the synchronous machine. It is applied to
brushless generators (without brushes) with auxiliary coil or without auxiliary coil (shunt).
The project is intended for operationinside the generator's junctionbox. The aluminum base is made
of material with excellent creep resistance and has excellent dimensional stability under low load.
The variations of the properties of the aluminum under the variation of temperature are low as well
as the coefficient of thermal expansion. Most importantly, its characteristics are not affected by
electrical variations.
The equipment is configurable via the adjustment potentiometer for reference of armature voltage,
stability and "droop" and has voltage adjustments via analog input or via digital input. There are
"jumpers" for selection of operating frequency and type of CT used, PAR5 or PAR1.
The equipment has a state-of-the-art processor capable of executing 70 million instructions per
second and with a very high accuracy analog-to-digital converter capable of acquiring electrical
quantities with excellent resolutions allowing the equipment to perform fast and accurate
calculations providing excellent operability.
Connection to the generator is via FASTON connectors.

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TECHNICAL FEATURES
The following table indicates the main technical characteristics of the equipment.
Nominal output current
10 A
Forced output current for 1 minute
12,5 A
Fuse for protection of the power supply
10 A / 300 V
Vad trimpot adjustable sensing voltage range
E1 –160 Vca à 300 Vca
E2 –330 Vca à 600 Vca
Frequency of operation in the sensing voltage range
50 Hz ou 60 Hz
Generator voltage measuring range
0 à 840Vca
Generator minimum voltage for pre-excitation
5 Vca
Minimum generator frequency for control
22 Hz
Rated operating voltage (power)
220Vca
Power supply range (3 e E3/4)
50 à 280Vca (up to 300Vca in transient)
Frequency of operation of the power supply (Power)
50Hz ou 60Hz
Power fluctuation voltage (Power)
±30%
Maximum input power
1350VA
Power consumption (by equipment)
~13VA
Power connection
Single phase
Sensing voltage connection
Single phase
Rectifier gain ratio controlled (no load)
0,45
Maximum field voltage
135Vcc
Static regulation
< 0,5%
Limiter U/F
Adjusted to 54Hz or 45Hz
Dinamic response adjustable by trimpot Stb
8 à 500ms
Working temperature range
-40°C à 60°C
Storage temperature range
-20°C à 40°C
Maximum relative humidity
(operation and storage)
0 –80%
Pollution degree
3
Protection degree
IP00
Operation altitude
Less than 2000m or greater equal to 2000m
EMI suppression
Differential EMI filter class X2
Alarm signaling
Indication of the alarms on the RGB LED
Regulator LED OK
LED RGB Green flashing and 5V lit indicates OK status
Approximate weight
350g +/-10g
Analog input
± 10Vcc
Analog input variation
Variation: +/-15% of the reference voltage
Digital input variation
CW com UP e DW / ±10% of the reference voltage
Parallel operation - Droop
TC PAR/5A ou PAR/1A
Droop
Ranging de 0 à 10 % of the reference voltage
Protections
Generator overvoltage.
Generator over current excitation
Generator over current
Rotating diode failure
Lack of sensing voltage at the startup
Limiters
Thermal excitation limit (Excitation current)
U/F
Lack of sensing voltage in operation
Alarms
Maximum shot angle
µController failure
Resin
Polyurethane anti-flame (V0)
Base
Non-flammable cast aluminum (V0)
Relay (protection alarm)
NF –Ok | NA –On protection
(10A –250VCA/125VCA/24VCC)
Table 1 - Technical characteristics of the Regulator

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BLOCK DIAGRAM
Figure 1 –Block diagram

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REFERENCE
The voltage adjustment of the GRTD-TH3 controllers can be done via trimpot (Vad) or via analog
input or digital input as shown in the diagram in figure bellow. The regulator will control the measured
voltage using as a reference the sum of the 3 settings.
When the three references are simultaneously being used there may be a voltage up to ± 30%
above the reference voltage.
VOLTAGE ADJUSTMENT VIA VAD POTENTIOMETER
The internal potentiometer setting adjusts the reference between 160 to 300Vac when the
equipment is operating at the lowest sensing voltage range through terminal E1, when the
equipment is using sensing voltage in the longest operating range through terminal E2 this variation
will occur from 330 to 600Vac. The clockwise increases the voltage reference and counterclockwise
decreases the reference.
VOLTAGE ADJUSTMENT VIA ANALOG INPUT
➢Variation of +15% à -15% on the reference voltage.
➢-10 Vcc à +10 Vcc
➢Consumption of up to 10mA at the analog inputs.
VOLTAGE ADJUSTMENT VIA DIGITAL INPUT
The setting via Digital Input is made by dry contact between the CM terminal of the voltage regulator
with the UP terminal or the DW terminal of the voltage regulator.
The contact made at the CM terminal with the UP terminal of the voltage regulator increases the
output voltage of the ramp generator by tripping from the Un (generator output voltage) to 15%
above Un at a preset time of 10 seconds.
The contact made at the CM terminal with the DW terminal of the voltage regulator decreases the
output voltage of the ramp generator by tripping from the Un (generator output voltage) to -15%
below Un at a preset time of 10 seconds.
Figure 2 –Reference Adjustment

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For example, please view the picture bellow:
Figure 3 –Digital input
PI CONTROLLER
The digital control block is show in figure bellow:
The controller used by the GRTD-TH3 voltage regulator is a PI control. The adjustment of the two
parameters that are the proportional gains KP, integral KI, are performed through the stability
potentiometer. The calculation cycle of the control is connected to the operating frequency of the
machine.
The purpose of the controller is to maintain the null error, the difference between the measured
voltage (negative terminal of figure 4) and the reference (positive terminal) equals zero. When
perceived a variation in the error it compensates increasing or reducing the output of the controller
with response dependent of the adjusted gains. The figure 5 exemplifies some typical controller
responses by varying the settings and the controlled system (generators).
Figure 4 - PI Controller

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POWER CIRCUIT
The power circuit is show in figure bellow:
Figure 6 –Power Circuit
Figure 5 –Machine output varying the stability parameters

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The power circuit is a half wave rectifier controlled by a digital controller. The output of the power
circuit is applied to the exciter terminals of the generator.
For safety, the regulator should provide 20% to 30% more voltage than is required by the generator.
The supply voltage of the regulator has a range of 50 to 280 Vac and supports transients up to 300
Vac.
Example: The field voltage of the generator must be less than 20 to 30% of the supply voltage
rectified in half wave. The field voltage waveforms are shown below in figure.
Figure 7 –Output voltage in function of the firing angle
The load of the regulator will be the field of the generator which is an inductive resistive load. This
will cause the current waveform to be continuous.
Note: Field current specification in full load is made with resistive and inductive load, controlling the
tripping to obtain the maximum field currents.
PROTECTIONS
Protections act directly on the virtual key that is virtually at the output of the controller, canceling the
voltage at the regulator output. The operation will only be restored as the "RESET" of the equipment,
which is performed when the regulator is de-energized. When the regulator is operating normally
and detects an event that causes an actuation of some protection, it releases a status via relay by
opening the contacts of the auxiliary contact terminals, with the relay being NF (normally closed),
the regulator is operating normally, and with the relay being in the NA (normally open) the regulator
has some actuated protection. The relay status is activated only when the Regulator is controlling.
During the re-energization of the equipment, the last protection activated during a period of 5
seconds will be indicated through the RGB LED.
Note: After the reset before energizing the causes must be checked.

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GENERATOR OVERVOLTAGE PROTECTION
➢Protection Reference: 25% of the reference voltage set by the trimpot Vad.
➢Time for protection action: 1 second.
➢Signaling: Alarm Led constantly lit in Strong Blue.
EXCITATION OVERCURRENT PROTECTION
➢Protection Reference: 12,5 A.
➢Time for protection action: 1 second.
➢Signaling: Alarm Led constantly lit in Red.
ARMATURE OVERCURRENT PROTECTION
➢Protection Reference: 15% above rated CT current.
➢Time for protection action: 2 seconds.
➢Signaling: Alarm Led constantly lit in Yellow.
ROTATING DIODE FAULT
The regulator is constantly measuring the fluctuations that occur in the excitation current, when a
variation occurs above a percentage of the average current, and the actuation time exceeds a
defined time the regulator signals an alarm of the occurrence of the fault.
➢Percentage reference of the average excitation current: 30%.
➢Time for protection action: 5 seconds.
➢Signaling: Alarm Led constantly lit in Cyan (Blue-green).
Figure 8 –Operation of protections

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LIMITERS
Limiters act by limiting or changing the output of variables, keeping them at levels that do not harm
the system.
U/f LIMITER
The U/f limiter is used to reduce the excitation voltage during motor shutdown. When reducing the
rotation, the generator requires more excitation to maintain the voltage and to avoid this actuates
the limit U/f. The U/f block is shown in figure 9.
A saída do bloco U/f envia o erro para o controle PI.
➢Frequency of operation of U/f: 54 Hz for 60 Hz, 45 Hz for 50 Hz, according to configuration
of frequency selection jumpers.
➢Fall U/f: Set reference voltage / reference frequency.
➢Signaling: Alarm Led constantly lit in Purple.
Figure 9 - U/f block
Figure 10 - U/f Adjustment
Figure 11 –Frequency selection jumper

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FIELD CURRENT LIMITER
The GRTD-TH3 is programmed to limit the generator drive current after a certain time. This time
allows the generator to respond to transients that require a high excitation current without affecting
the dynamics of the regulator. The limiter uses a PI controller. When the limit condition is reached,
the alarm will be reset.
td: Fall time until it reaches the current limit
The td can be higher or lower depending on the configuration of the PI control
➢Excitation Overcurrent: 12,5 A
➢Limit of excitation overcurrent: 10 A
➢Overcurrent limit time: Obtained from the current curve.
➢Signaling: Alarm Led constantly lit in Pink.
LOSS OF SENSING VOLTAGE
During initialization, when there is no sensing signal, the AVR acts by shutdown the excitation.
During operation, phase failure occurs when the sensing voltage signal is lost, so the actuation
maintains the last valid firing angle in the control regime without the condition of phase failure
Signaling: Alarm Led constantly lit in Green.
Figura 12 - Controle PI para limitador de corrente
Figure 13 –Current Limit

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ALARMS
Alarms are event signals which the regulator does not operate.
MAXIMUM FIRING ANGLE
➢Alarm reference: 100% firing angle of the thyristors.
➢Time for alarm action: 1 second.
➢Signaling: Alarm Led constantly lit in Yellow-Green.
MICROCONTROLLER FAILURE
➢Alarm reference: Perda no sinal de clock interno –watchdog atuando.
➢Time for alarm action: instantaneous.
➢Signaling: Alarm Led constantly lit in Shock Pink.
VIRTUAL SWITCH
The virtual switch (digital switch) is represented by the figure block bellow:
Its activation is made internally by the over voltage, excitation overcurrent, generator overcurrent
protections.
PARALLEL OPERATION WITH REACTIVE COMPENSATION
When the generator is operating synchronously to a network or other generator, it is said to be
operating in Parallel.
In this mode of operation, the regulator can no longer keep the output voltage of the regulator fixed,
since the generator is now connected to other generators and all will have the same output voltage.
In this case, it is necessary to introduce an additional control, "Droop" mode to modify the reference
voltage of the generator according to the variations that occur in the reactive power of the generator.
The Droop mode reads the reactants and compensates in the feedback to keep the voltage of the
generator close to that of the bar, thus reducing the reactive generator.
This compensation is limited by the droop trimpot that determines the maximum allowable
variation in the reference to maintain the reactive.
Figure 14 –Virtual switch

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PHISICAL PROTECTIONS
PROTECTION FUSE FOR EXCITATION FIELD
The F1 fuses are used to interrupt the input current in order to reduce damage if a short circuit
occurs, protecting the generator field as well as the power circuit. The figure 16 shows the position
of the fuse.
The GRTD-TH3 has a half-wave rectifier, the input current is the same as the field current. The fuse
used is 10A with a fast acting feature to protect the equipment.
The fus eis sized according to the excitation current:
➢Operation in 3A is recommended to use the 3.15A fuse;
➢Operation in 5A é recommended to use the 5A fuse;
➢Operation in 7A é recommended to use the 7A fuse;
➢Operation in 10A é recommended to use the 10A fuse;
Fuse supplied with GRTD-TH3: Manufacturer: Littelfuse (PartNumber: 0217010.MXP)
Features: fast acting; Dimensions: 5x20 mm; Current/Voltage: 10A / 300V. Time to open:
% of Maximum current
Time to open
150%
Minimum of 2,7 hours
200%
Maximum of 20 seconds
1000%
Minimum of 3 milliseconds
Table 2 –Time to open fuse 10A
Figure 15 –Droop Mode
Figure 16 - Fuse