Specifications
7.6KW
BT
GENERATOR
SINGLE
PHASE
NO-LOAD
VOLTAGE
ADJUSTMENT
1. Voltage adjustment
is
made with the generator regulation
being governed by the compound transformer.
2.
Operate the generator, apply a moderate load momentar-
ily and remove it. Note the voltage output from the gen-
erator's
120 volt legeS) (230 volt
50
hertz). The no-load
voltage should be between
121
- 124 volts at 61.5 - 62
hertz (234 - 238 volts at 51.5 -
52
hertz).
NOTE:
The
no-load voltage should be adjusted
to
the
volt-
age
produced by
the
generator once started and a
nwmentary load should be applied
to
excite
the
trans-
former and
then
renwved.
The
voltage produced by
the
generator after this nwmentary load
is
renwved
is
no-
load
voltage.
3.
To
raise or lower the voltage, shims
of
varying thickness
(non-conductive material) are placed
or
removed from
under the steel laminated bar on top
of
the compound
transformer. The material used for shimming should not
soften at temperatures in the
176
0
F (80
0
C) range. A
small reduction in no-load voltage
(1
to 3 volts) can
sometimes be accomplished by gently tapping the top
of
the laminated steel bar to reduce the gap between the
existing shims and the transformer core.
Generator
Frequency
1. Frequency is a direct result
of
engine/generator speed:
1800 rpm = 60 hertz; 1500 rpm =
50
hertz.
2.
To
change generator frequency follow the steps below.
a. Configure the AC terminal block for the desired volt-
age frequency as shown below. Ensure that the case
ground wire is connected to the correct terminal block
neutral ground stud.
NOTE:
The
white/green ground
wire
may
be
renwved
in
those
installations
where
the
AC circuit has a separate
neutral and ground
circuit.
This
will prevent the unit
from
being
a ground
source
in
the vessel
b. Start the engine, monitor voltage and adjust engine no-
load speed. Adjust the throttle arm or the throttle stop
screw to produce engine speed desired.
60 hertz: no-load speed, 61.5 - 62.0 hertz.
50
hertz: no-load speed, 51.5 - 52.0 hertz.
115V
50Hz
"'I-+.a:::::{<
230V50Hz
a=::D
0
c. After the no-load hertz adjustment is made, the no-load
voltage may need to be readjusted.
In most cases,
if
the
generator was producing the correct no-load voltage at
the previous hertz setting, it would
be
correct at the
changed hertz setting.
In the event it needs adjustment, adjust the shim thick-
ness under the laminated steel bar
of
the transformer.
60 hertz: no-load voltage,
121
- 124 volts.
50
hertz: no-load voltage, 234 - 238 volts.
d.
Load the generator to the rated amperage output corre-
sponding to the hertz speed
of
the generator.
Rated Loaded Speed
60 hertz: loaded speed, 58.5 - 59.0 hertz
50
hertz: loaded speed, 48.5 - 49.0 hertz
Maximum voltage drop acceptable at full rated output
(amps)
60 hertz: 108 - 110 volts
50
hertz: 215- 220 volts
Should the voltage drop below the proper rate, loaded
excitation can be increased to raise this voltage by
repositioning the connection on the Voltage Connection
Terminal.
TERMINAL
BLOCK
WIRING
CONNECTIONS
Winding
Connections
Needed
To
Obtain
The
Proper
Voltage
and
Frequency
'~:~=~L1
110V
50
Hz
6 - 5 4 4 9
10
~~~~~~:,
230V50
Hz
6
5
44
9
10
~~:~12n~
~::±:::~'
24n~
6 N 5 4>4
yo
.
115/230V
50Hz
a=::D
0
120V
60
Hz
o
a=::D
120/240V/60Hz
The
frame
ground
wire
must
be
moved
when
changing
from
115
volts
and
1101220
volts
50
hertz
to
230
volts
50
hertz.
From
making
con-
nections
to
the
AC
terminal
block,JJseJenninaIJlnds.for
1/4
inch
studs
that
will
accept
multi-strand
copper
wire
sized
for
the
amperage
rating
from
the
hot
lead
con-
nection.
The
frame
ground
wire
is
whtte
or
white
with
a
green
strip.
It
connects
between
the
neutral
stud
and
the
generator
frame.
N
L1 L1
N
L1
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ClRCUIT
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Engines & Generators
40