The alternator
is
designed
to
limit its own
output
by itself so
that
the amature
is
free from any overcurrent
that
may burn it up.
It
is
free from an overcurrent, too,
because
the
silicon diodes check any current from the battery when
th~
output
voltage
of the generator falls below the battery voltage.
To
operate
the
field relay, the alternator has N terminal connected with the neutral
point
of
the
armature. A half of 0 terminal voltage
is
on
this terminal.
Relay
6-2-1. D.C. Generator Relay .
This unit performs
the
functions
to
regulate voltage generated by generator
(constant-voltage regulation) and
to
prevent reverse current to generiltor.
1)
Make sure
that
relay terminals A and F are connected with right ones on
generator. Wrong connection
will
cause relay
to
burn up.
2)
Connect earth terminal firmly with frame or with terminal E on generator. Its
loose connection
will
much affect relay performance, causing
too
much current
to
run.
3) Relay bears a
seal
placed on after necessary adjustments.
I~s
checkup and
adjustments require precise instruments.
If gone wrong,
have
it serviced
at
a
specialized service shop, without breaking the seal.
6-2-2. A.C. Generator Relay
Relay
The relay
is
a point-action type
that
regulates the field current by closing and
opening the contact points so
as
to control the generator output.
6-3 Starter
The
starter
is
a D.C. compound
motor
of so-called pinion-shift type where
pinion
is
shifted by magnet switch.
It
is
provided with an overrunning switch so
as
to
prevent it from driving
the
starter
any longer than necessary. But remember
that,
its function consisting only
in
starting, it
should be switched off
as
soon
as
the engine catches.
1)
Keep flange fastened tight. Poor grounding
will
keep starter from running.
2)
If starting should be difficult,
don't
run starter repeatedly
but
Uike
appropriate
measures and after pre-heating well, try again.
3)
If
a press on button
"S"
on starting switch has failed
to
bring pinion
in
mesh
to
set the engine running, switch off starter immediately.
If
it shquld be kept on
with pinion
out
of mesh or
in
imperfect mesh, magnet switch "1ight get burnt.
4)
With
long use, commutator
will
get blackened
or
spotted with burns and thus
spark harder.
So, every 500Hr
of
run take off
brUSh
cover and check its
-
53-
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