Control Of Voltage And Frequency; Avr Board Settings; Characteristics Of Regulator - Sincro SK 400 Manuale Di Uso E Manutenzione

ENGLISH

6.4.3 Control of voltage and frequency

Control that the voltage and frequency levels required by
the generating set correspond to the generator data plate.
The generator leaves the production line
with a star connection (unless otherwise
!
specifi ed on order) which is used as
WARNING!
reference for its nominal data.
All changes in connection must be carried
out solely by a qualifi ed specialist.
!
WARNING!

6.4.4 AVR board settings

The various generator parameters are
!
factory set before testing: so no further
adjustments on the machine should be
WARNING!
necessary; in the event that the covers
need to be removed for the adjustments and live
electrical con tacts are left bare, it is important that
this operation be carried out solely by qualifi ed
specialists in electrical plant maintenance.
The regulator AVR DBL1 uses a microprocessor for
adjustment of generators 50/60 Hz brushless. 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 fi lter.
• (Protection by fuse (on the bottom of the regulator includes
a spare fuse).
• Protection against overvoltage.
• Setting jumpers through 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
• Using a software called AVRTerm to confi gure the controller,
get alerts and the evolution in time of voltage.
• The voltage regulation and stability through trimmers.
24
Adjusting the underfrequency
A frequency control progressively deactivates the machine
when the drive motor speed drops below a pre-set,
adjustable threshold preventing over-excitement at low
operating speeds and abating the load engage effects on
the motor.
With jumper J1 inserted, the regulator is set at the threshold
of 47 Hz and when the jumper J1 is removed by using the
solution at 60Hz the threshold for action is set to 57Hz (to
change the regulation of underspeed is necessary to use
Software AVRTerm).
Limit excitation
The limit of excitation is adjustable from 0 to 100% in increments
of 0.1%. When the excitation exceeds its limit, the controller is
in alarm condition (alarm is visible with the software AVRTerm).
The excitement is
the short-circuito. The
machines will be adjusted at the factory to 100%.
RS485 communication port
The AVR has
port to communicate
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
(using Windows operating
communicate with
The extreme ease of use allows its immediate use.
Reference voltage
The voltage of the
terminals A, B and C. The sensing may be single-
phase or three
The digital controller has a higher precision than the analog
version because it reads the rms voltage (not the average
value).
the maximum value
limit excitation to
a RS485 communication
with the
software
system), created
the digital regulator
generator is monitored
phase (maximum
during
all the
PC.
for PC
to
DBL1.
on
500 Vac).