taining electronic systems and the other side having general electrical
systems. Both sides
of
the bus
are
on
at all times except
when
either an
external power source is connected
or
the ignition/starter switch is turned
on;
then a power contactor is automatically activated
to
open the
circuit
to
the electronic bus. Isolating the electronic circuits
in
this manner
pre-
vents harmful transient voltages from damaging the
transistors
in
the
electronic equipment.
MASTER
SWITCH. ·
The
master
switch
is
a split-rocker type switch labeled
MASTER,
and
is
ON
in the
up
position and OFF in the
down
position. The.right half
of
the switch, labeled BAT, controls all electrical·power
to
the-
aircraft.
·
The left half, labeled
ALT
controls the alternator.
Normally, both sides
of
th~
master switch should be used simulta-
neously; however, the
BAT
side
of
the switch could be turned
ON
sepa-
rately
to
check equipment while
on
the ground. The ALT side of the
switch,
when
placed. in the OFF: position, removes the alternator from
the electrical system.
With
this switch
in
the OFF position, the
entire
electrical load
is
placed
on
the battery. Continued operation with the
alternator switch in the OFF position will reduce battery power
low
enough
to
open the battery contactor, remove power froin the alternator
field, and prevent alternator.
restart.
-
AMMETER.
.
The
ammeter
indicates the
flow
of
current, in amperes, from the
alternator
to
the. battery
or
from the battery
to
the ah::craft electrical
system.
When
the engine
is
operating and the rµaster
switc~
is
ON,
the
ammeter
indicates tlie charging rate applied
to
the battery.
In
the
event the
alternator
is
not functioning
or
the
electrical load exceeds the
output
of
the alternator" the ammeter indicates the discharge.
ra
"te
of
the
battery. ·
OVER-VOLTAGE
SENSOR
AND
WA
.
RN
.ING
LIGHT.
The
aircraft
is
equipped with an automatic over-voltage protection
system consisting
of
an over-voltage sensor behind the instrument
1
and a red warning light, labeled
HIGH
VOLTAGE,
under the oil t pane
ture and
pressure
gages. empera-
In
the event an over-voltage condition occurs th
sor
automatically removes alternator field curre
't
edover-voltage
sen-
n an shuts
down
the .
2-5
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