Service manual
THE
BE
GENERATOR
SINGLE
AND
THREE
PHASE
DESCRIPTION
This generator
is
a four-pole, brushless, self-excited genera-
tor which requires only
the
driving force of the engine
to
pro-
duce
AC
output. The copper
and
laminated iron
in
the
exciter
stator are responsible
for
the self-exciting feature
of
this
gen-
erator. The magnetic
field
produced causes
an
AC voltage
to
be
induced
into
the
related excitor rotor windings during
rotation. Diodes located in the exciter rotor rectify
this
volt-
age
to
D<;
and
supply
it
to
the windings
of
the rotating field.
. This creates
an
electromagnetic field which rotates through
the windings
of
the main stator, inducing
an
AC voltage
which
is
supplied
to
a load. An AC voltage is produced
in
the
auxiliary windings
of
the
main stator and
is,
in tum, supplied
to
a voltage regulator. The regulator produces a DC voltage
to
further excite the exciter stator windings, enabling the gen-
erator
to
produce a rated AC output. The voltage regulator
senses AC voltage output and adjusts DC excitation
to
the
exciter stator winding according
to
amperage load the gener-
ator
is
furnishing.
To
maintain a constant voltage output.
INTERNAL
WIRING
SCHEMATIC
CIRCUIT
BREAKER
A circuit breaker
is
installed on
all
WESTERBEKE genera-
tors. This circuit breaker will automatically disconnect gener-
ator power
in
case
of
an
electrical overload. The circuit
breaker can be manually shut off when servicing the genera-
tor
to
ensure that
no
power
is
coming into the boat.
NOTE:
This circuit breaker is available
as
a WESTERBEKE
add-on kit for earlier model generators; contact
your
WEST-
ERBEKE dealer.
3
PHASE
TWELVE
WIRE
RECONNECT
ABLE
.-.-----,
1 C I
r--------,
I I
:
STATOR
I
r-I-:
--'2~--r!-~--:
11
CIRCUIT
BREAKER
PART
NUMBERS
EXCITER r - - - + - - - - - - - ,
I A
lIB
I
I I I ROTOR . I
!
I
1'2
'-1:r-_
3
__..:1-----:
1~
.
r-+-i~4:-----i:I-----:·S
Pc
.
20
KW
-
60
Hz
NO.
42701
[16
KW
-
50
Hz
NO.
42718)
I
+1
al~1
!
1.
:1
: i -1* 4
3:
I 1 I b I
I I : 2 I
J L
___
+
_______
..J
L.
_____
...1
REGULATOR
7 Tennlnal
c:::;:
~5;;;:::::
==::;:
~
BkIck
r--+:---..---j----.... 4
~~~6
~====:::
~
25
KW
.;.
68
Hz
NO.
42702
[20
KW
-
50
Hz
NO.
427111
7 1
8
~_"I
r..
,
FUSE
6.3 AMP
Engines & Generators
51
A EXCITOR
32
KW
-
68
Hz
NO.
42703
[25
KW
-
50
Hz
NO.
T 0
BI
1. Exciter Stator Wmdings
B.ROTOR
1. Auxiliary Wmdings a.b.c.
2. Diodes
3. Main Rotor Windings
4.
Pori Resistor
C.
MAIN
STATOR
1.
Auxiliary Windings
2. - 7 Main Stator Windings
3. Auxiliary Windings
(AC to Regulator)
D.
AC TERMINAL BOARD
E.
REGUlATOR