Westerbeke 8.0KW-60Hz Service Manual page 75

BT GENERATOR TROUBLESHOOTING CHART
The following troubles\1ooting chart is desigued to give
insight into problems which may be encountered with
the
BT
brushless generators operating on compound transfonner reg-
ulation. Owing to the simplicity of the equipment and con-
trols, troubleshooting is relatively easy, once the relationship
between cause and· effect is understood. Most potentialprob-
lems are covered in the text of this manual
Keep
in
mind that a basic fundaroental knowledge of electric-
ity is required for this troubleshooting, and always remember
that lethal voltages are present in the circuitry; therefore,
extreme caution is essential when troubleshooting a generator.
Only a few basic tools are necessary for diaguosis and repair.
These are hmd tools: an arnpprobe and a quality volt-ohm-
meter capable of reading less than one ohm due to the preci-
sion required
in
reading component winding resistances.
Before attempting any repairs, get a clear an explanation of
the problem as possible, preferably from an individual wit-
nessing the problem. In some cases, this may bring to light a
problem which is related to the method of operation rather
than equipment fault. Bring basic repair IDols with you on the
initial trip
to
the problem equipment, such as: diodes and
bridge rectifier, so that
if
the problem should be found in one
of these easily replaceableparts, the problem can be reme-
died early and efficiently.
NOTE: When fault jindin~,.
troubleshoot components in the order indicated below.
COMPONENT CHECKS
REFER TO THE INTERNAL WIRING DIAGRAMS
1. LOW VOLTAGE 60-100 VOLTS AC
F. Selector Switch
3. NO AC VOLTAGE OUTPUT· MAIN STATORJROTOR COMPONENTS/TRANSFORMER
C. ·(1 +2) Exciter Stator Windings
8. Rotor Components
8-2 Exciter Rotor Diodes
8·3 Rotor Field Windings
8-1 Exciteor Rotor Windings a,b, c
A. (1-1 +2) Exciter Stator Windings
2. RESIDUAL VOLTAGE· EXCITER CIRCUIT FAULTY
A. (1-1 +2) Exciter Stator Windings
G. Bridge Rectifier
D-3.Transformer Auxiliary Windings
8-4.Suppressor
8·2.Diodes (4-6 open/sh'qrtened)
D. (1 +2) Compound Transformer Windings
B-3.Rotor Field Windings
C-3.Main
StatorA~xlliary
Windings
F.: Selector SWitch
\
02
r--------------~----l
1
B :
A
.1 ,
1 ,
+1
00'
1
r
r
II : * :
i
+ -
I .
b
I
1
21
1 2 3
I
~---~-------------~.
6
1\.
5
VI
8
3
.3
i,',~2
1
' 1 '
2
!i
2
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_______ 7
I I · I :
: I I
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I :
:rI_~"1
I :
: 3
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'1 2 3
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~ 111G1@!'I@!~
A
m
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6 ~~R~ED~~~~+~ k~==~~~-,
'r __
~YE_~_OW~&_RE_0-J
RED
-kJ-
AC REO
G
-:-;;-;0
REEN GREEN _ AC 9
F)'-- - ... ,
GREEN
it!
YEllOW!
I \
YELLOW
:II
=
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w
:3
=
GREEN
,-;;,-;;;;;;-,--,I\:--:;;,--,!,
J..
BLACK
B~CK "-~~~~~====~B~LA~tK~====~~~~~l===~B~~~C~K======~~~~
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YEllOW - PLUG
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60cyc.
BLUE
50 eye.
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WESTERBEKE
Engines & Generators
69
o,~_
W2
80 Hz TERMINAL
07
0'
w
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