Merc-O-Tronics 98 - TESTING FIELD WINDINGS; Field Winding Test Procedure

ROTOR
INSERT
HAIR
5TATOR
HttD
WINDINGS
wt1{Dll,lGs
Figure
33
TESTING
FIEID
WINDINGS
1. To
test
the
f|eld
winding, separate
the field
winding
connector
(the
one
with
the red and
blue
leads)
from
the wiring
harness.
2. Take
two
pieces
of bare
copper wire
(20
GA) about
2"
long and
shape
into hairpins.
See
illustration above.
3.
Place in each female conneetor
making contact
with
each
terminal.
see Fig. 33.
4. This
will allow
you
to make field
winding
test without
any
difficulty.
A.
Turn selector switch
to
position
No. 2 do
not clip
small
test
leads
together.
B. Adjust
meter
knob
scale No. 2
so meter
pointer
will line up
on
red set line on
right side of
meter.
5.
After
zeroing
in meter
pointer
attach
one
small
lead
to either
hairpin
connector
and
the
other
small
lead
to
the lamination
or
stator.
6.
The reading should be
infinite
if
the field
winding
is
not
grounded.
7.
When testing for
shorted
or open
field
windings
leave
the
two copper
hairpins in
position
as
in
Fig. 33.
8.
Connect
the other
small
test lead
to the other
hairpin
and
leave
selector
switch on
position
No. 2,
read scale
No. 2.
9.
The
readings should
be
1.2
-
3.2 ohms
or
(1.9
-
2.2
ohms
at
80of).
10.
A lower
reading
indicates
a
shorted
winding.
11.
An infinite
reading
indicates
winding
is open.
lZ.
In
either
case
the field
winding
is
defective.
CO
PPER
PINS
/\
,\
STAIOR
POLTS
32