EMRI 6GA2490 User manual

6GA2490
Voltage regulator for generators
Instruction Manual V1.1
Product version V1.1.0.0

Manual V1.1 Page 2 of 8
Warnings And Commissioning information
Revision history
The manual does not cover all technical details of the product. Specifications may be modified by
the manufacturer without notice. For further information, the manufacturer should be contacted.

Manual V1.1 Page 3 of 8
Table of contents
General description
The EMRI 6GA2490 is an AVR which is an electrical and mechanical improvement of the old
Siemens 6GA2490 & Spresy 15 AVR system used by Siemens, Uljanic and Hyundai.
The product is more rugged and compact design to improve mechanical properties.
The unit is completely encapsulated for harsh environments. The moulding compound protects
against vibrations and is heat conductive to improve temperature stability. The terminals are
strong solid encapsulated to make it mechanical improvement compared to the genuine part.
Installation, maintenance and adjustment don’t require special application software.

Manual V1.1 Page 4 of 8
Quick reference
Adv.
Setting
P/I control
Time
Overshoot Prop. Gain
Recovery time
Int. Time
prevent damage to the AVR and generator.
Turning the P/I control must be performed by a control specialist to
Sensing voltage
Remote adjust
7
35
Max. value : 1K
nom = 24Vac
Link 20-22
0..1kΩ
-V-W clockwise
Compound
Exciter field
T6
2U1 2V1 2W1
R1
V1
G2
Adv.
Setting
Voltage
V(Voltage)
- +
Adv.
Setting
Stability
P(Prop. Gain)
I(Int. time)
- +
- +
Terminals internally linked
11 9
13 6
15 8
~~~
+-
F1 F2
R2(3)
T7(2.1) & T8 (2.2)
R2(4) & T5(2.1)
Sensing range:
Without reference selector +/- 21..28Vac
With reference selector +/- 18..31Vac.
Reference value selector 20-21
% ( Ω)
24V
+11%
Remote adjust
1 %
Maximum value at terminal 2 -21 is 1KΩ.
V
-15%
55%
%
Voltage
1
14
1
Ø7.5
Ø7.5

Manual V1.1 Page 5 of 8
Wiring diagram
Wiring diagram with 6GA2490

Manual V1.1 Page 6 of 8
Tips and Suggestions
Explanation of operation of the 6GA2490 generator / excitaton system
Generator : No load o eration
The excitation power / supply for the exciter field comes from the excitation transformer T6.
In no-load the value is determined by the settings of L1 ( Airgap ) and tapping’s of T6.
This is during all conditions, loaded and unloaded generator. The excitation should be adjusted in such
a way that it is always slightly too much. In the no load situation, the avr itself can only reduce the
voltage. In other words: The excitation supply voltage from T6 is too much.
When you should disconnect eg. The internal wiring no. 1 or 5 from the AVR. The avr function is
disabled, and you can see how much excitation power ( and as a result of that ) the generator voltage
will raise. Reconnecting wire 1 or 5 enables the avr function again.
Generator : Load o eration
When you load the generator, the excitation must increase. This additional excitation power must be
supplied by the (current) transformers (T1, T2 and T3 and its connections to T6).
The current transformer should also always bring so much power in return for the current which is going
through, that the total excitation power output of T6 is always a bit too much. The avr can only reduce
the amount of excitation power which is too much through the internal leads 1 and 5.
If you run your generator with a disconnected lead 1 and 5 (internal wiring) and you still have a
decreasing voltage at load. You should check the current transformer / adjust the airgap / check the
symmetry of the ac voltage at 2U1, 2V1 and 2W1.
It is also possible that your generator needs too much excitation anyhow. Check this according the tag
plate, or try to excite the generator manually with a controllable dc power source if you have.
It is possible that the exciter stator (field), the exciter rotor windings, the diodes, the overvoltage
suppressor (if present at the diodes inside the generator) or the main rotor winding is defect.
T7 and T8 are the isolation and stepdown transformers for the sensing of the AVR
T4 and T5 are current transformers which provide the reactive current sharing system in combination
with the tandem potentiometer R2.
Capacitors C1 are for the building up of the excitation.
Remember : The AVR can only reduce the voltage.

Manual V1.1 Page 7 of 8
General installation information
Absolute Maximum Ratings
- The Absolute Maximum Ratings are those limits for the device that, if exceeded, will likely damage the device. Exceeding the
absolute maximum ratings voids any warranty and/or guarantee.
Mounting
Mounting of the product should be done in such a way that:
-the absolute maximum ambient temperature rating of the product will never be exceeded.
-maximum cooling (direction of cooling ribs and direction of airflow) is achieved.
-Mounting no humid air can flow through the product or condensation occurs.
-dust or other materials or residue will not remain in or on the product.
-the maximum vibration is not exceeded.
-personal contact with persons is impossible.
Wiring
-Diameter size of the wiring should be enough to carry the expected current. Wire insulation should be enough to withstand
the expected operating voltages and temperatures.
-To improve EMC emission and immunity, care should be taken for the lay out of the wiring. This in respect to all wiring in the
installation.
-Keep current carrying wires as short as possible.
-Keep wires carrying a total sum of zero Ampere close to each other, or in one single cable, E.g. U, V, W, or F1(+) and F2(-),
or Phase and neutral, or S and T.
-Avoid current carrying conductors next to sensing or control wiring. Especially current controlled by SCR’s or PWM controlled
transistors.
-If sensitive sensing signal cables need to be laid across distance along other cabling, shielded cable is preferred. Keep the
shield as long as possible and the wiring outside the shield as short as possible. Do not solder or shrink the shield to a
regular wire. Connect the original shield to ground at one side with an as large as possible contact surface.
Additional installation information
- When the product is supplied by means of a transformer, it should never be an auto-transformer. Auto-transformers react as
voltage sweep up coil and may cause high voltage peaks.
-Standard fit capacitors or over-voltage suppressers across F1(+) and F2(-), or exciter field terminals inside the generator
should be removed.
-When the product is supplied by means of a transformer, it should be able to carry at least the maximum expected current.
Advisable is, to have a transformer which can carry twice the maximum expected current. Inductive loads make voltage sacks
and peeks into the secondary voltage of a transformer, from which the device may malfunction.
-It is not recommended to apply switches in dc outputs. It is preferred to use switches in the ac supply inputs of devices. In
case it is unavoidable to have switches in the dc output of a device, action must be taken to avoid over voltage damage to the
device due to contact arcing. Use a voltage suppressor across the output.
-It is not recommended to apply switches or fuses in the sensing lines. Defects can cause high voltage situations due to over-
excitation.
-When using a step down transformer in medium or high voltage generators, the transformer should be three phase (if three
phase sensing), and the transformer should be suitable for acting as a sensing transformer. If the transformer is unloaded,
connect a resistor to avoid voltage waveform distortion.
-The phase relation from the generator to the AVR is important. Also when voltage transformers and/ or current transformers
are installed.
-When using a step down or insulation transformer in the droop circuit, phase relation from the generator to the AVR is
important.
-CT’s wiring, connected to the AVR should never be grounded.
-Always disconnect electronic products, circuits and people before checking the insulation resistance (Megger check).
-Due to differences in generators impedance’s, EMC behavior is not predictable. Therefore the commissioner / installer should
be aware of proper and correct installation.
-Large, highly inductive, exciter stator windings can cause destructive high voltage peaks. Adding a resistor from 10 to 20
times the exciter stator field resistance reduces voltage spikes. If necessary filter can be fitted additionally. (e.g. snubber, RC-
network)
-Upon problems during commissioning, faulty behavior or defects in the generator, consult the fault finding manual at our web
site
-Some advises may be overdone or seem extraordinary, but since the electrical rules are the same everywhere, these advises
are given.

Manual V1.1 Page 8 of 8
Contact
EMRI Electronics B.V.
Manufacturer
Morsestraat 10
6716 AH, Ede, Netherlands
Tel: [phone]
Website: www.emri.nl
E-mail: [email protected]
ICELAND,
Hafnarfjordur
Rafeining ehf
Tel: [phone]
Fax: [phone]
Website: www.rafeining.is
E-mail: [e-mail]
POLAND,
Gdynia
An-Elec Sp. z o.o.
Tel: [phone]
Fax: [phone]
Website: http://an-elec.pl
E
-
mail:
info@an
-
elec.pl
INDIA,
Faridabad
Power Solutions
Tel: [phone]
Fax:: [phone]
Website: www.psolindia.com
E-mail: [email protected]
SOUTH AFRICA,
Roodepoort
Yneldo Electronics
Tel: [phone]
Fax: [phone]
Website: www.yneldo.com
E
-
mail:
[email protected]
POLAND,
Szczecin-Mierzyn
Marel Serwis
Tel: [phone]
Fax: [phone]
Website: www.marel.szczecin.pl
E-mail: [e-mail]
CHILE,
Santiago
Lucio Vicencio y CIA.LTDA
Tel: [phone]
Fax:: [phone]
Website: www.luciovicencio.cl
E
-
ma
il:
[email protected]
NORWAY,
Bergen
Frydenbø Electric A/S
Tel: [phone]
Fax: [phone]
Website: www.frydenbo.no
E-mail: [e-mail]
SINGAPORE,
Singapore
Cyclect Electrical Engineering
Tel: [phone]
Fax: [phone]
Website: www.cyclect.com.sg
E-mail: [e-mail]
THAILAND,
Bang Lamung
Semtec Maritime/Genetech Co.Ltd
Tel: [phone]
Fax: [phone]
Website: semtecmaritime.com/
Email
:
[email protected]
UNITED
ARAB
E
MIRATES,
Sharjah
KDU Technical Services
Tel: [phone]
Fax: [phone]
Website: www.kdutech.ae
E
-
mail:
[email protected]
SWEDEN,
Kungälv
Elektrisk Drivteknik EDT AB
Tel: [phone]
Tel: [phone]
Website: www.edtab.se
E
-
mail:
[email protected]
GREECE,
Piraeus
Stavros Kassidiaris S.A.
Tel: [phone]
Fax: [phone]
Website:www.kassidiaris.gr
E
-
mail:
[email protected]
CANARY ISLANDS,
Las Palmas
Zamakona Yards
Tel: [phone]
Fax: [phone]
Website: www.zamakonayards.com/
E
-
mail:
[email protected]
UNITED KINGDOM,
Stockton on Tees
MJR Controls
Tel: [phone]
Fax: [phone]
Website: www.mjrcontrols.com
Email:
[email protected]
UNITED STATES,
Kemah - Texas
Ramtec Marine Systems LLC
Tel: [phone]
Fax: [phone]
Website: www.ramtec-marine.com
Email:
waling@ramtec
-
marine.com
REPUBLIC OF PANAMA,
Panama
PASRAS S.A.
Tel: [phone]
Fax: [phone]
Website: www.pasras.com
E-mail: [email protected]
ROMANIA,
Constanta
SAMTEC SRL
Tel: [phone]
Fax: [phone]
Website: www.samtec.ro
E-mail: [email protected]
UNITED KINGDOM,
Cheadle Hulme
TGS Total Generator Solutions Ltd
Tel: [phone]
Fax: [phone]
Website: http://totalgeneratorsolutions.com
Email:
[email protected]m
POLAND,
Szczecin
MARCONTREL
Tel: [phone]
Fax: [phone]
Website: www.marcontrel.com
E
-
mail:
[email protected]
TURKEY,
Izmir
INTEGRAL
Tel: [phone]
Email: [email protected]om