Specifications
5.0KW
BC
GENERATOR
SINGLE
PHASE
Ballast
Resistor
0.5
Ohm
Early
model
integral controllers
have
a ballast resistor
installed
along
the
DC
positive (+) lead running from the
bridge
rectifier
to
the
integral controller. This coil-type resis-
tor
functions
to
suppress high amperage
draw
coming
from
the
controller
when
it
is
trying
to
charge a discharged starting
battery.
BALLAST
RESISTOR
Early
controllers having
this
resistor
in
the
DC
charging cir-
cuit
are
of the three lead
type.
These three lead types consist
of either
three
spade plugs
in
connections or consist
of
three
wire
leads
from
the controller.
r-n-------
1
I I
I
I
Hz Hz
I
1
50
60
7 8
91
I I
I
fC~PACITO~Sf
I
I
.Hi
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______
.;.
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.J
TESTING
THE
EXCITER
WINDINGS
Single
Capacitor
1.9
Ohms
Dual
Capacitor
2.2
Ohms
Dual
Exciter
1.3
Ohms
An
AC
voltage
is
induced
in
these
windings
by
the
rotating
field.
Checking
the
residual
voltage
output
from
this
winding
can
determine
the
condition
of
the
winding
when
troubleshooting.
RESIDUAL
VOLTAGE:
Single
Capacitor
Model:
Dual
Capacitor
Model:
Dual
EIcHer
Model:
10
-14
Volts
AC
from
each
winding
14
-16
Volts
AC
from
each
winding
7 - 9
Volts
AC
from
each
winding
AC
voltage
can
be
measured across the capacitor(s) while the
generator
is
operating. This voltage
may
be
as
high
as
400
to
500
volts
AC.
This voltage buildup
is
accomplished
as
the
exciter windings charge the capacitor(s) and the capacitor(s)
discharge
back
into
the exciter windings. This
AC
voltage
reading
is
taken
between
the
#60 Hertz connector and
the
#
connection
plugged into the capacitor(s) while the generator
is
operating
at
its
rated Hertz (61.5 - 62.0). This
flow
of satu-
rating
AC
in
the exciter windings produces a phase-imbal-
ance
type
of field that effects the auxiliary windings: a
beneficial
result that produces good motor starting character-
istics
for
this
type of generator.
To
measure
the
resistance value of the exciter windings,
locate
the
#9 and
the
#50 Hertz capacitor connections.
NOTE:
Three
numbered capacitor connections
exist:
#7,
#8,
and
#9,.
and
two
Hertz
connections,
#50
and
#60.
Unplug
any
other connections from
the
capacitor(s) noting
their position on the capacitor. Place one lead of the ohmme-
ter
on
plug connection #9 and the other lead
on
plug connec-
tion
#50
Hertz.
Measure the resistance value
of
the
exciter
windings. Check
to
make sure there
is
no
continuity
to
the
ground/generator case
from
either of
the
two
leads. Also
check that
no
continuity exists between either the #50 Hertz
plug or
the
#9 plug and
any
of the
main
stator windings leads
on
the
AC
terminal
block.
If
continuity
is
found here, a fault
exists between
the~e
two
winding
groups.
FIELD
TESTING
CAPACITORS
FIELD·
TESTING
THE
CAPACITOR
With a capacitor
meter,
test the capacitor following the
instructions included with the meter,
and
compare the results
with the
value
shown
on
the
capacitor. When a capacitor
meter
is
not available, perform the
following
simple
test:
1.
Marking them
so
they
may be reattached correctly,
unplug
the
connections from
the
capacitor.
2.
With
a jumper, short across the
two
connections exposed
in
the
previous
step.
This ensures
the
capacitor
is
dis-
charged
as
it would
be
at shutdown.
. 3. With
an
ohmmeter
~et
on
the high R scale, place
its
plus
(+) lead
on
one capacitor connection
and
the negative
(-)
lead
on
the
other capacitor connection. A resistance
should be read
and
should rise
slowly
as
the meter
attempts
to
charge
the
capacitor.
This
indicates a presum-
ably
good
capacitor.
4.
Indications
of
a defective capacitor:
a. Zero resistance or
no
rise
in
resistance value (shorted
capacitor).
b.
Infinite resistance (open capacitor).
c.
No
continuity should be found between the capacitor's
connections
and
the
capacitor's case or base.
s.
Capacitor Ratings (Capacitor
meter)
a. Single Capacitor
Units:
25.0 microfarads (uF)
5°
b.
Dual Capacitor
Units:
31.5 microfarads (uF)
5°
NOTE:
Ratings
are
found on
the
capacitor
case.
NOTE:
The
older
single
capacitor
models
used a 25.0
microfarad
capacitor.
All
new
model
single capacitor
units
now
have
a 31.5 microfarad
capacitor.
When
replacing
a capacitor
in
either
an
early
model or a later
model,
ensure
that
the
correct
rated
capacitor
is
installed.
The
capacitor
rating
is
marked
on
the
housing
of
the
capacitor:
25.0
Microfarad
capacitor
PN
035985
31.5
Microfarad
capacitor
PN
035978.
Engines & Generators
51