TESTING
EXCITER
STATOR
WINDINGS
A +
&STUD
STATOR
WINDINGS
SELECTOR
SWITCH
WINDINGS
A·1
AND
A-2
TESDNG
RESISTANCE
Resistance readings for exciter windings
A-1
and
A-2
Witi;I
..
the selector switch in the COMP position are taken betwe'en
the positive ( +) and negative (-) leads lifted
off
the
bridge
rectifier. Neither
of
these two leads should
h~ve
continuity to
the generator
ease/ ground
..
A-1
&
A-2
...,.
11.5 0
·.
TWOGREEN
WINDINGS
A-1
TESDRG
RESISTANCE
BRIDGE
RECTIFIER
RED
Resistance readings for exciter stator windings
A.:.1
with the
selector switch
in the ELEC position is
ta~n
between the .
yellow wire and the black wire at the AVR plug.
A.-1
.::..
53.0
0.
AVRPLUG
WINDINGS
A-2
TEmNG
RESISTANCE
Resistance readings for exciter winding
A-2
with the selector
switch in the ELEC position is
taken between the green wire
lifted
off
the negative(-) terminal
of
the bridge rectifier and
the red
Wires
lift~.
off the positive (
+)
terminal
of
the bridge
rectifier.
A-2- 13.5 0 ·
Note:
The
white striped wiring on earlier
model
generators
has been changed
to
solid colors on current generators, the
colors, lwwever, remain the same. ·
TESDNG
THE
BRIDGE
REcnFIER
(meter·
FLUKE
multimeter)
1. Set the meter on .Ohins scale and connect the positive lead
to point #4. Take the negative lead and momentarily touch
point#1,#2,#3
and 15. There should
be
no Ohm value
· registered
on
the meter.
2.
Remove the positive lead from point #4 and connect the
negative lead
to
it. Momentarily touch points #t, #2
and
#3.
The Ohm meter should register an arbitrary value at each point
it touches.
3. Leave the negative lead on
PQint
#4, touch point
fl5
with
the positive lead. The meter should register no
Ohm value.
4. Place
the
positive
lead
on
point #1
and
the
negative
lead
on
point
#3.
The
meter should register
and
Ohm
val~e.
Reverse these connections
and
the meter
should
reg1ster
an,Ohm value.
If
the rectifier fails any
of
these tests replace the rectifier
as
it
is defective.
Note:
The
AC-DC
terminals
location
may
vary
on
some
bridge rectifiers but +
and-
are clearly marked.
BRIDGE
RECTIFIER
Note:
The
AC
&
DC
terminal locations
may
vary . The
DC
+
will always
be
clearly marked.
Engines & Generators
89
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