Sincro HB 2 Manual Para El Uso Y Mantenimiento página 19

Caution! The installer must clearly mark on the plate the actual
connection from those provided on the list so as to avoid possible
malfunctions and even injury to persons or damage to objects.
Caution! For electrical circuits other than star-series, consult the
section and specific wiring diagrams given in this manual.
The Sincro Technical Office is always available for any clarification.
The data plate is supplied loose so that it can be applied to the generator
in the position indicated in the figure after any coating is completed.
The surface receiving the plate must be smooth, clean and any coating
should be completely dry. To make sure its is firmly applied, remove
about 20mm of backing paper. When this piece is in position and firmly
applied, the backing paper can be gradually pulled away while the plate
is being pressed in position. A full bond is obtained after 24 hours.
4. OPERATING PRINCIPLE AND CHARACTERISTICS OF THE VOLT-
AGE REGULATOR SYSTEM
The exciter stator has a residual magnetism, which guarantees self-
exciting of the generator on start-up (that thereby generates a residual
voltage of about 10% nominal voltage).
The AVR, powered by an auxiliary circuit on the main stator, acts on the
exciter stator indirectly controlling the field generated by the main rotor
by means of the sequence exciter rotor - diode bridge - main rotor.
The voltage regulator controls and keeps constant the average voltage
of one phase.
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.
In conclusion the regulator reaction time can be modulated to eliminate
any voltage instability that may arise.
4.1 AVR board
The voltage regulator of the HB4 series has a ±1% voltage precision
(±2% for the HB2 series) in the machine's working range with distortion
free loads.
The phase voltage can be adjusted by trimmer V (see figure) from 185
to 290V.
The regulator is equipped with a frequency dependant excitation limiter;
the frequency can be calibrated by trimmer UF, which is factory set at
46Hz (56Hz), ±1Hz. On reaching this frequency, the machine begins to
reduce its voltage until it deactivates for very low frequencies.
A fuse protects regulator and generator from overloads and/or faults.
Another trimmer (ST) allows to adapt the regulator to the generator
parameters.
The regulator has been built to suppress the voltage surges on releasing
the load that are below 20% at nominal load.
A considerable surge capacity is available for asynchronous motors.
In fact the regulator is capable of simultaneously supplying the generator
over 250% (200% for the HB2 series) of rated current at PF= 0.4 with a
voltage drop of less than 20%.
5. GENERAL MECHANICAL AND ELECTRICAL SPECIFICATIONS
FOR COUPLING WITH MOTOR
As an independent unit, designed to be built into a electricity generating
set, it is impossible to apply all the signal decals on the generator during
production. These decals, indicating a potential hazard or risk due to live
components are supplied loose and have to be applied by the constructor
of the electricity generating set in the positions indicated in the figure to
the side once assembly of the whole set has been completed.
Caution!
The installer must clearly mark on the plate
the actual connection from those provided
on the list so as to avoid possible malfunc-
tions and even injury to persons or damage
to objects.
For electrical circuits other than star-
series, consult the section and specific
wiring diagrams given in this manual.
Trimmer V
Trimmer ST
HB - Maggio 2004 - Rev. 00 - 19
ENGLISH
AVR board
Trimmer UF