Specifications
7.6KW
BT
GENERATOR
SINGLE
PHASE
INTERNAL
WIRING
FOR
12
SIDD
BT
GENERATOR
r-------.,
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r-------,
AC
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D
i'
6 l
r----
--
--------.
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I A I
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i~i!
; 1
....
r---+---1~
9
! 2
....
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, B
1>1-
4
3,
.
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I 3 I
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===;7'..c=
I 0
I 3 r WHT/
BlK
•
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L
_____________
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L
______
J w
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...
J @
, G
ORANGE
+
AC
BLACK
DC
-I<l-
AC
GREEN
YELLOW
RESIDUAL
VOLTAGE
CHECK
1.
"Residual Voltage
18
-
22
volts
AC.
NOTE:
The
anwunt
of
no-load voltage produced
by
the
generator can
be
an
indicator
of
where in the generator
the problemlfault may
lie.
1bis voltage is the
AC
voltage produced by the generator
from
magnetism in the exciter stator
field.
1bis
voltage
is
measured between the
AC
neutral and hot
leges)
with no-
load
on
the generator running at its hertz.
The presence
of
residual voltage is an indication that the
following generator components are
OK:
1.
Exciter Rotor
(B-1
a,
b,
& c) & (B-2)
2.
Rotating Field (B-3)
3. Main Stator
(C-1"&
C-2)
4. Compound Transformer
(D-1
& D-2)
The fault lies
in
one or more
of
the following compo-
nents
in
the exciter circuit:
A.
Exciter Stator (A-I)
B. Bridge Rectifier
(G)
C. Main Stator Auxiliary Windings (C-3)
D.
Compound Transformer Auxiliary Winding (D-3)
2.
1Welve
(12) volts DC excitation
of
the exciter stator
windings should cause the generator to produce between
125
-
135
volts
AC
between each hot lead and the neu-
tral. (1\velve volts DC
is
applied between the lifted (+)
and (-) leads
of
the bridge rectifier, + to + and - to
-.)
Correct voltage produced with twelve volts DC excitation
indicates the fault is
in
one or more
of
the above listed
~omponents·B,·-D-or
E. If·the generator doosnot proouce
125
-
135
volts AC, then include A and C. .
3. The absence
of
any voltage from the generator indicates a
fault with the main stator windings
C-1
and C-2 and/or
the compound transformer windings
D-1
and D-2. Other
failed components that
can
produce this same no-voltage
output are the posi-resistor
in
the exciter rotor and four or
more failed diodes in the exciter
rotor.
~
~
" , _
WHT/GREEN
• S
o
I T
L-..
__
....
U
D
a. Apply
12
volt DC excitation to the exciter stator
wind-
ings
as
explained
in
paragraph
2.
A fault in the main
stator and/or compound transformer windings such
as
a
short
will
cause the generator engine
to
load down and
the shorted windings
to
eventually produce smoke
as
the excitation
is
continued.
4. Voltage output greater than residual and less than the
rated output indicates a fault in the exciter rotor/field
B-1,
B-2, B-3. Excitation
of
the generator
as
explained
in
paragraph 2 should produce a partial rise
in
voltage out-
put
and,
when removed, the voltage will return
to
the
original low output
JUMPER
.
FROM
DC(-)
START
MOTOR
I
SOLENOID
I'
.
/
/
I
,"
..
.j
::'1-
--,
POSITIVE
(+)
ORANGE
I'
BRIDGE
RECTIFIER
EXCITING
mE
GENERATOR
WITH
12
VOLTS
KEEP
THE
EXCITER
CIRCUIT
POLARITY
CORRECT:
DC+
to
Battery
at
Starter
DC-
to
Case
Ground
NOTE:
Current
model
bridge
rectifiers are configured
differently,
but
+ and - are
still located
at
the
comers.
Engines & Generators
41