NO
VOLTAGE
OUTPUT
-
MAIN
STATOR
WINDINGS
TESTS
B
EXCITING
THE
GENERATOR
The generator may be excited using 12 volts DC taken
from the engine's starting battery. This voltage is applied
across the
#50 and #9 leads
of
the exciter circuit windings
(unplugged) with any other numbered leads unplugged
from the capacitors. The generator's reaction during
flashing will help determine its fault.
NORMAL
VOLTAGE
OUTPUT
RANGE
DURING
12
VOLT
EXCITA·
TION
Single
Capacitor
Dual
Capacitor
Dual
Exciter
22
-
26
VAC
24
-28
VAC
12 ·14
VAC
o A slight rise in the output voltage with the loading
of
the engine and/or a growling noise from the generator
end will indicate a fault in the main stator windings.
o No rise or a very slight rise
in
the output voltage will
indicate a fault in the exciter windings.
o Normal output voltage as specified above, check
exciter circuit.
TESTING
THE
MAIN
STATOR
WINDINGS
Test the main stator windings
at
the
AC
terminal board by
first removing all the
AC
output leads, the ground
connection, and the brass interconnects. This will isolate
the six leads
on
the terminal·
board
which make up the two
stator groups.
TESTING
MAIN
STATOR
WINDINGS
[60
Hz
CONFIGURATION
SHOWN]
NOTE:
The
studs
on
the
AC
terminaL
board
are
identified by
the
six
red
wire
that attach
to
them.
These
wires
are
num-
bered 1
thru
6.
There
are
no
numbers
on
the
terminaL
block.
TESTING
RESIDUAL
VOLTAGE
Test for residual voltage between terminal #1 and terminal
#3. Then test between terminal
#4 and #6 (shown above).
RESIDUAL
VOLTAGE
2
-3
VOLTS
AC
Correct readings will indicate the stator windings are okay.
Check the exciter windings.
CHECK
RESISTANCE
GROUP
1·
Test the resistance value between the
#1
terminal
and the #3 terminal.
GROUP
2 • Test the resistance value between the #4 terminal
and the #6 terminal.
RESISTANCE
VALUES
Single
Capacitor
Dual
Capacitor
BCA
Model
Dual
Exciter
Circuit
0.6
ohms
0.5
ohms
0.3
ohms
0.5
ohms
Engines & Generators
64.
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