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2)
Cleaning Slip rings
The slip ring surfaces must be uniformly bright.
Slip rings showing black spots, excessive wear,
or uneven wear must be repaired.
A
stained slip
ring lowers generator efficiency and output volt-
age. Polish the slip rings with fine sandpaper while
turning the rotor until rough spots disappear. Care
should be taken not to touch the rotor coils with
the sandpaper.
9-6
BRUSH
The brushes must be smooth where they contact
the slip rings.
If
not, polish smooth the brushes
with sandpaper.
A
brush that is not smooth pro-
duces arcs between the brush and slip ring lead-
ing to possible damage. Usable brush lengths are
from
5
mm
to
15
mm
(0.2
"
to
0.6").
A
brush shorter than
5
mm must be replaced be-
cause decreased contact pressure between the
brush and slip ring lowers generator efficiency and
output voltage.
9-7
A.V.R
(AUTOMATIC
VOLTAGE
REGULATOR)
1)
Features
This
AVR
operates to control the field current in
order to maintain the output voltage for the
AC
current, which generated by the magnetic flux by
the field
coil.
2)
A.V.R.
trouble may
be
identified by simply look-
ing at the
A.V.R.,
or by the inter-lead resistance
with a'tester,
or
actually mounting it
in
the gen-
erator and operating
it.
Fj3.
9-6
Fig.
9-7
of
the
A.V.R.
-
1
Fig.
9-8
-
3.1
-