Control Of Voltage And Frequency; Characteristics Of Regulator - Sincro SK315 Série Manuel D'utilisation Et De Maintenance

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
WARNING!
nominal data. To change connection consult
the diagrams in the 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 covers
WARNING!
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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