ALTERNATOR/REGULATOR
SERVICE
Stator
Disconnect
the
stator lead
wires
from
the
coil
and
check for
continuity between the
three
leads
with a
circuit
tester.
If
no
continuity
is
found, the stator windings
are
open.
Next,
check
for insulation between
each
lead
and
the
core.
If continuity is
found,
replace
the
stator.
Field
CoB
(Rotar)
Check resistance
between
the
slip rings.
The
resistance must
conform to the specified
value.
Resistance
Value:
3.87Q
:!::
10%
Check
for continuity
between
the slip ring
and
the
core. If
there
is
continuity, it
means
that
the coil or
slip
ring
is
grounded. Replace the rotor
assembly.
Checking
Brusb
and
Brusb
Spriag
Replace the brush if it
has
worn
to
the replacement value.
Check the brush spring force. Also confirm that the brush
moves
smoothly
in
the brush
holder.
Standard
Replacement
·
Yalue
Required
at
Brush
length
(mm)
18
8
Brush
Spring
Force
(g)
37fF!O
210
Checking
the
Sip
Ring
Because
the slip ring wears
very
little, the diameter must
be
measured with a micrometer.
Replace
the rings (rotor
assembly) when wear
reaches
the
replacement value.
Standard
Replacement
Yalue
Required
at
Slip
Ring
0.0.
33mm
32.2mm
Runout
0.03
mm
or
less
0.2mm
The slip ring
must
be smooth
with
no
surface
oil. If
neces~
sary
clean
and
polish with a
fine
crocus cloth.
REGULATOR
The regulator consists
of
a
voltage
regulator
and
a lainp
relay; their wires are gathered
into a connector. The voltage
regulator is
used
to
always keep
the
alternator output
con~
stant regardless
of
alternator
speed
and·
to
cut off the flow of
current
to
the
field
coil when
necessary.
The lamp relay
is
used
on
the Captain panel only
to
illuminate the panel light
indicating
no
alternator charge.
The
SOA
alternator has a
built-in lC regulator. During alternator
operation,
field
cur-
rent is controlled automatically
by
the IC
regulator.
1.
Connect
an
ammeter (approx.
60A
rating) between the
battery positive terminal
and
its
cable.
2. Connect a voltmeter between
the
generator terminal L
and the ground.
In
this
case,
the
vo\tmeter
must
indicate
"O".If
otherwise indicated, a
defeCtive
alternator or·
faulty wiring is suspected.
IW'IWESTEIIBEICE
l
Englne_s
& Generators
76
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