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Westerbeke 20.0KW sbeg Specifications Page 44

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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
±I
%
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
HER1Z
trimmers completely clockwise (Maximum) in the same
manner. With the generator running at no-load, at normal
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.
red
~
green
c
~
~
yel/ow
~
Hertz
Amp
E
Slab
g
'E
Vall
""
g
~
VOLTAGE
REGULATOR
DIAGRAM
Stability
This
potentiometer
pennits
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 I
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 permits
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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