Bt Generator Troubleshooting - Westerbeke 8.0KW-60Hz Service Manual

BT GENERATOR TROUBLESHOOTING CHART
The following troubleshooting chart is designed 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 potential prob-
lems are covered in the text of this manual
These are hand tools: an urnpprobe and a quality volt-ohm-
meter capable of reading less than one ohm due to the preci-
sion required in reading component winding resistances.
Keep in mind that a basic fundamental 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 diagnosis and repair.
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 tools 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 replaceable parts, the problem can be reme-
died early and efficiently.
NOTE:
l-Vhen fault finding, 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. ND AC VOLTAGE OUTPUT - MAIN STATOR/ROTOR COMPONENTS/TRANSFORMER
C. (1 +2) Exciter Stator Windings
B. Rotor Components
B-2 Exciter Rotor Diodes
B-3 Rotor Field Windings
B-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
B-4.Posi Resistor
B-2.Diodes (4-6 open/shortened)
D. (1 +2) Compound Transformer Windings
B-3.Rotor Field Windings
C-3.Main Stator Auxiliary Windings
r----------1 r----------, 50 Hz TERMINAL
I e ' :
0 :
\
F. Selector Switch
j-------------------1
, B :
,
,
,
,
+ ,
A
r!1
:~i
+
- I
~f
2 t 1 2 3
r
~-----------------~
:
: :
:
I I ' I
z
~
0:
tIl
,
:
,
I
I
,
"
Q
r
,.
'"
'"
,ii
~~RE~D====~+~ k~~~~
RED
*~'"
YELLOW
&
RED
REO
GREEN ,-- GReeN
L-...
AC
s
F) . . . . --',
GREEN
~
YELLOW /
T \
YELLOW
GREEN
, J
BLACK
BLUE
t
t ~~/======~B~LA~C~K======~~~~====~~========~~
__
J
'~_ ~
/ BLACK
BLACK
+
A.v.R.
BLUE
L.~Y~EL~L~OW~---------------~
PLUG
~--------------~~--~
("",--,WESTERBEKE
-,-Engines
&
Generators
80
.
,
6
1\
5
VI
B
3
.3
w
=>
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m
60eye.
50 eye.
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~
.
W2
60
Hz
TERMINAL
'7
.,
w
=>
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m