Control Of Voltage And Frequency; Dbl1 Avr Settings; Characteristics Of Regulator - Sincro SK315 Serie Manual De Uso Y Mantenimiento

6.4.3 Control of voltage and frequency

Control that the voltage and frequency values required
by the generating set correspond to the generator data
plate.
The generator leaves the production line with a star
connection (unless otherwise specified on order)
which is used as reference for its nominal data.
To change connection consult the diagrams in the
WARNING!
appendix of this manual.
All changes in connection must be carried out solely
by a qualified specialist.
WARNING!
6.4.4 AVR DBL1 board settings
The various generator parameters are factory set
before testing: so no further adjustments on the
machine should be necessary; in the event that the
WARNING!
covers need to be removed for the adjustments and
live electrical contacts are left bare, it is important
that this operation be carried out solely by qualified
specialists in electrical plant maintenance.
The regulator AVR DBL1 is designed with a
microprocessor for the voltage management of 50/60
Hz brushless generators. The voltage regulation is
done by controlling the current in the stator exciter.

6.4.4.1 Characteristics of regulator

• Automatic adjustment of the voltage;
• EMI filter;
• protection by fuse (on the bottom of the regulator
includes a spare fuse);
• protection against overvoltage;
• jumpers to set the reference voltage (single phase
and three phase voltage range);
• setting the excitation type (standard or PMG);
• set jumper through the remote control of voltage;
• setting the stability through Dip switches;
• using a AVRTerm software to configure the controller,
get alerts;
• the fine voltage regulation and stability through
trimmers.
Sensing voltage
The voltage of the generator is monitored on
terminals A, B and C. The sensing may be single-
phase or three phase (maximum 500 Vac).
The digital controller has higher precision than the
analog version because it reads the rms voltage (not
the average value).
Underfrequency protection adjustment
A frequency control progressively deactivates the
machine when the drive engine speed drops below
a pre-set, adjustable threshold preventing over-
excitement at low operating speeds and abating the
load engage effects on the engine.
With jumper DI1 inserted, the threshold is adjusted
at 47Hz and when the jumper DI1 is removed (for
60Hz application) the threshold is adjusted at 57Hz (to
change these setups is necessary to use the AVRTerm
software).
RS485 communication port
The AVR has a RS485 communication port to
communicate with the PC. The connection is via a
form of conversion RS485/USB, the USB connection
is direct to the PC, the RS485 connection to the AVR.
Communication software
AVRTerm is a communication software for PC
(using Windows operating system), created to
communicate with the digital regulator DBL1.
The extreme ease of use allows its immediate use.
Limit excitation
The excitation limit is adjustable from 0 to 100% in
0.1% increments with AVRTerm software. When the
over excitation limit is exceeded, the AVR is in the
EXCITATION LIMIT alarm status. During Generator
Short-circuit excitation is at maximum limit value. The
excitation limit is factory adjusted at 100%.
Over voltage alarm
If voltage is over limit value, the AVR is in the
GENERATOR OVERVOLTAGE alarm status in
Windows software.
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