Westerbeke 7.6 kw EDT Operator's Manual page 46

7.6KW BT GENERATOR SINGLE PHASE
DESCRIPTION
This generator is a four-pole, brushless, self-excited generator
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 exciter rotor windings during rota-
tion.Diodes located in the exciter rotor rectify. this voltage to
DC 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. A step down transformer is connected in
parallel to the AC output of the main stator. An AC voltage is
produced in the auxiliary windings of the transformer and the
main stator and is, in tum, supplied to a full-wave bridge rec-
tifier. The rectifier produces a DC voltage to further excite
the exciter stator windings, enabling the generator to produce
a rated AC output
.
,
INTERNAL WIRING FOR
12 STUD ST GENERATOR
Circuit Breaker
A circuit breaker is installed on allWESTERBEKE 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 no AC power is coming from the generator to
the vessel.
NOTE: This circuit breaker is avaiillble as a WESTERBEKE
add-on kit for earlier model generations; contact your
WESTERBEKE dealer.
CIRCUIT BREAKER
WHITEN
BREAKER PART NO. 42707
r-------,
I
C
I
r-------,
I
D
I
AC
6
l
r- A
I
1
I I
I
B
-l>I-
4
31
I
I
c
I
I
I
-
I
2
I
r------ --------,
: 1
so:
L _______ ::.. _____ J
G
:~!4
1
•
1
!
I
~
I
1
I
•
I
I
3
1
L
~
_____ J
w
"
z
. .
a:
!
•
!
2 . . . . .
1
~-
I
I 3
IWHT/BLK
L.2.1~H--I-- ~J
•
I WHT/GREEN
!
1 . . . .
i
1
5 R
9
til
o
I
3 N
2 A
L
7
8
•
B
L
o
C
K
®
ORANGE
+
AC
BLACK
0
J
s
T
U
o
DC
GREEN·
-
A. EXCITER STATOR WINDING
A-I Exciter Stator Windings
B. EXCITER ROTOR and FIELD
1. Auxiliary Windings (A - B - C)
2.
Diodes
(6)
3. Rotating Field Windings
4. Pozi Resistor
C. MAIN STATOR
1. Main Stator Windings
2. Main Stator Windings
3, Main Stator AUxiliary Windings
-KI-
AC
YELLOW
D. COMPOUND TRANSFORMER
1. Compound Transformer Windings
2. Compound Transformer Wmdings
3. Compound Transformer Auxiliary Windings
Resistance readings and voltage checks can be accessed
easily for the components in 111e exciter circuit A, G, C-3 and
D-3 by locating 111e color coded wires at 111e connection
points shown on the above schematic. When checking
winding resistance values be sure to lift both of 1110
component's electrical connections. .
G. BRIDGE RECTIFIER
~
WESTERBEKE
Engines & Generators
36