BC
GENERATORS
TROUBLESHOOTING
NO
AC
VOlTAGE
OUTPUT
EXCITING
THE
GENERATOR
To
quickly determine a short
or
an open in the main stator
winding, excite the generator with 12
VDC
using one exciter
winding group to accomplish this..
·
The AC voltage that the generator will produce measured
between the line and neutral during excitation
wi~l
be very
low.
NORMAL
AC
VOLTAGE
DURING
12
VOC
EXCITATION:
12-16VOLTSAC
[:.
1-{)
2~
3---Q
~::::
6--0
MAIN
STATOR
EXCITING
PROCEDURE
Locate one
of
the exciter winding groups in the generator.
Unplug all connections from both capacitors. Connect 12
VDC across the winding using' the winding end connection, ·
Winding group between #50Hz and #9.
~ERM~
50Hz
60Hz
7 8 9 9
Jl
7
60Hz
50Hz
• • • • • •
J..
• •
12
VOLT
OC-t-
REACTION
DURING
EXCITATION
(Unit
running
-
12
VDC
applied
to
winding)
NORMAL
VOLTAGE
DURING
EXCITATIIN
IS
12
·16
·voLTS
AC
1.
A very low AC output and loading
of
the drive engine
and
a growling boise from the generator end.
This indicates a shorted stator winding to ground
or
the
stator windings
are
shorted to each other. Isolate the
winding groups and verify a short to ground. No
continuity should be found between the two isolated
stator winding groups.
2.
No reaction from the generator
or
drive engine. No AC
output.
70
This
is
an
indication
of
an open in one
of
the main statbr
winding groups. Isolate the winding groups and verify
and open winding.
No
Continuity
between
Isolated
Stator
Winding
Groups
M~
65
432
1
·! ! !
~
TEST
EACH
OF
THE
WINDING
LEADS
INO/V/OUALLY
AS
SHOWN
·
THERE
SHOULD
BE
NO
GONT/NUITY
BETWEEN
LEADS
No
Continuity
between
Isolated
Stator
Windings
and
Ground
MM\
6~
432
,,
!·!
. ! 6 6 :
~UND
TEST
EACH
WINDING
'rO
CASE
GROUND
MAIN
STATOR
RESIDUAL
VOLTAGE
Line to Neutral
4-
6 VAC
(This indicates good stator windings)
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