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generators
in
the
electrical
charging
system
of
twin
breaker
bus.
engine
aircraft
and
when
they
charge
into a single
battery,
a paralleling
generator
regulator
system
is
c.
Check
the
bus
voltage,
if it is not 28. 5
±
.
25
necessary
for proper
operation
of
the
charging
system.
volts,
an adjustment
should
be made.
An external
two
unit paralleling
relay
also provides
for separate
operation
of either
generator,
should
the
d.
Operate
the
LH engine
at
cruise
rpm with
the
other
become
inoperative.
There
is no adjustment
to
LH alternator
"ON",
and
the
electrical
load
reduced
the
paralleling
relay,
their
operation
is adjusted
by
to
a minimum.
the
shunt paralleling
coil located
on
the
voltage
reg-
ulator
unit.
e.
On
the
Delcotron
regulator,
remove
the
hex
plug from
the
cover
and
turn
the
inner
slot head
screw
clockwise
to
increase
and
counterclockwise
ADJUSTING
THE VOLTAGE
REGULATOR
(Generator)
to
decrease
the
voltage.
Each graduation
marked
on
the
cover
corresponds
to
a 0.
3
volt
change.
Remove
Before
any adjustment
of
the
voltage
regulator
can be
the
plastic
plug labeled
"REG"
from
the
cover
on
made,
it must be at operating
temperature.
To adjust
the
Oeco regulator
and adjust
by
turning the
poten-
the
voltage
regulator
a fixed resistance
is substituted
tiometer
clockwise
to
increase
voltage
and counter-
for
the
external
charging
circuit
by disconnecting
clockwise
to
decrease
the
voltage,
the
battery
lead at
the
regulator
and
connecting
the
resistance
between
the
regulator
"Bat"
terminal
and
f.
Make any adjustments
in small
increments
and
ground.
A
test
voltmeter
is connected
in parallel
allow
2
or 3
minutes
for
the
system
to
stabilize
be-
with
the
7 ohm resistance.
The resistance
must be
tween adjustments.
able
to
carry
6 or
7
amperes
current
without
any
change
of resistance
due
to temperature
changes.
g.
The
opposite
regulator
may be checked
and
With
the
generator
operating
at 3300 rpm (1730 engine
adjusted
in
the
same
manner,
rpm) with
cover
in place,
note voltage
reading
on
voltmeter,
h.
For
final
check
and adjustment
both engines
should
be operated
at
cruise
rpm with both alterna=
The voltmeter
must
read
27
to
28.
5 volts.
If
this
tors
on and each carrying
approximately
50?o load.
reading
is not
obtained
the
regulator
must be reset.
To adjust
voltage
setting
remove
cover
and
turn
adjusting
screw
clockwise
to
increase
voltage
and
GENERATOR
BRUSH WEAR LIMIT
counterclockwise
to
decrease
voltage
setting.
Generator
brushes
should
be
replaced
before
their
(CAUTION(
maximum
wear
limits
are
reached.
The minimum
permissible
brush
length
is
one
half its original
If adjusting
screw
is
turned
down (clockwise)
length.
beyond
the
normal adjustment
range,
the
spring support
may
fail
to
return
when pres-
sure
is relieved.
In
such case,
turn
screw
ALTERNATOR
counterclockwise
until sufficient
clearance
develops
between
screw
head and spring
Delcotron
alternators
are installed
as
optional
equip-
support,
then
bend
spring support
upward
ment on
the
Model
95, serials
TD-578
and after.
carefully
with
small
pliers
until
contact
is
The
following
procedures
should
be
used when
serv-
made with
screw
head.
Final
setting
of
icing
the
"Delcotron
".
the
unit should
be approached
by increasing
spring
tension,
never
by reducing
it. If
The Delcotron
Alternator
and regulator
are designed
setting
is
too
high,
adjust
unit below re-
for use
on
only one polarity
system,
therefore, the
quired
value,
and
then
raise
to
exact
set-
following
precautions
must be observed
when
work-
ting
by increasing
spring
tension.
ing
on
the
charging
circuit.
Failure
to
observe these
precautions
will result
in
serious damage
to the
After
each adjustment
and
before
taking
voltage
read-
electrical
equipment.
ing,
replace
the
regulator
cover,
reduce
generator
speed
until relay
points
open and
then
bring
the
gen-
a.
When installing
a
battery,
always
make abso-
erator
back
to
speed again,
lutely
sure
the
ground
polarity
of
the
battery
and
the
ground
polarity
of
the
"Delcotron"
are
the
same.
VOLTAGE
ADJUSTMENT
FOR DELCOTRON
AND
b. When connecting
a
booster
battery,
make
certain
OECO TRANSTSTORIZED
REGULATORS
to
connect
the
negative
battery
terminals together
and
the
positive
battery
terminals together.
a.
A Regulator
Select
switch
allows either
voltage
regulator
to
operate
both
alternators.
Run
the
en-
c.
When
connecting a charger
to the
battery,
con-
gines approximately
15
to
20
minutes
at
a 50
load
nect
the
charger
positive
lead
to the
battery
positive
(25
amperes
each
alternator)
to
allow
the
regulator
terminal
and
the
charger
negative
lead
to the
battery
temperature
to
stabilize.
negative
terminal.
b.
Connect
a
precision
voltmeter
to the
circuit
d.
Never operate
the
"Delcotron"
on open circuit.
3-35
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Troubleshooting
