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Westerbeke 16.0KW SBEGA-50HZ Specifications Page 43

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VOLTAGE
REGULATOR
ADJUSTMENTS
Description
The
voltage regulator is
an
advanced design which ensures
optimum
AC alternator performance.
It
is equipped with
complete protection circuitry to guard against operating
conditions that could
be
detrimental to the
AC
alternator.
Volts
FUSE
PROTECTS
THE
REGULATOR
BOARD
FROM
AN
ELECTRICAL
OVERLOAD
This potentiometer is used to adjust output voltage.
At
proper
engine operating speed the output voltage should
be
held at
±!
% from a no-load condition to a full rated generator output
and
from
power
factor 1.0 - 0.8 with engine drive speed
variations
up
to -6%. Prior
to
starting the engine,
tum
the
VOLT
and STAB trimmers (using a mini phillips screw-
driver) fully in a counter clockwise (Minimum) direction
until you feel them hit their stops.
Tum
the
AMP
and
HERTZ
trimmers completely clockwise (Maximum) in the sarne
manner. With the generator running at no-load, at
Donnal
speed,
and
with VOLT adjust at minimum, it is possible that
output voltage will oscillate. Slowly rotate the
VOLT
adjust clockwise.
The
voltage output
of
the alternator will
increase and stabilize. Increase the voltage to the desired
value.
In
this situation, only the green
LED
will stay lit.
re,
~
'"
green
~
~
yellow
!O
Heitz
..
Amp
E
Slab
0
E
Voll
'"
0
~
VOLTAGE
REGULATOR
DIAGRAM
Stability
This potentiometer permits variation
of
the regulator's
response
to
generator load changes
so
as
to
limit
overcompensation and obtain a minimum recovery time to
the normal voltage output.
In order to adjust the regulator stability the alternator must be
running at no-load and the output must
be
monitored.
Tum the STAB adjust slowly clockwise until the voltage
starts
to
fluctuate.
At
this point rotate the STAB adjust
counterclockwise until the voltage is stable
within!
or 2
tenths
of
a volt.
Amp-Hertz
These two adjustments are used in conjunction with the two
protection circuits in the voltage regulator that are indicated
by the illumination
of
a colored
LED
lights.
1.
Delayed overload protection (yellow LED).
2.
Low
speed protection (red LED).
Both systems have
an
intervention threshold which can be
adjusted using the respective potentiometer. Each
of
the two
circuits are able to cause an adequate reduction in excitor
voltage to safeguard the excitor windings and prevent their
overheating.
The overload protection system has a delay which pennits
temporary overloading
of
the generator during times such as
motor start-up
or
other similar load surge demands. The
regulator also has a third
LED
(green), that glows during
generator operation to indicate correct operation
of
the
regulator with the generator.
Engines
&
Generators
32
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