Westerbeke 5.0Kw BCDR Operator's Manual page 45

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
,1-r-+--:_U
ClRCUIT
~
CIRCUn
II-A-t-:;.-U CIRCUIT
• • BREAKER
~
BREAKER • • BREAKER
l~gCIRCUIT
L!!!
BREAKER
,....,.-+-:;;;:-I
CIRCUIT
• • BREAKER
Engines
&
Generators
40