PIPER
SENECA
II
SERVICE
MANUAL
k.
The balancing regulator system as described provides for automatic load balancing
of
parallel
operated alternators having independent field excitation circuits. The pilot can while
in
flight remove either
alternator system completely from the aircraft system and maintain operation
of
the
other
system.
11-21. PREPARATION
FOR
TESTING. (Regulators may be tested using the aircraft's alternator
or
an
alternator test stand.)
CAUTION
Do
not
interchange regulator leads. This will destroy regulator and
void warranty.
a.
The aircraft technician or
other
electrical system's specialist must disconnect the battery ground
cable at the battery before connecting or disconnecting a test ammeter
or
other test equipment or before
making wiring changes in the electrical system.
b. Voltmeters with test probes or clips are
not
recommended. Fully insulated bolted terminal
connections are best and these should be attached when
all
power
is
removed
as
described above.
c.
When installing a battery in an aircraft, be sure that the battery negative terminal
is
in
a position
so
that
this terminal can be connected to the battery ground cable for negative ground systems.
d. The regulator under test
is
to be mounted
on
a grounded metallic surface using three No. 8
screws pulled up tight.
For
extended test periods the heat transfer from regulator to the mounting surface
is
significant.
e.
A ground wire between the regulator
"GND"
terminal and the aircraft or test stand structure
is
essential for
proper
operation.
The
alternator frame must also be solidly bonded
to
the system ground.
f.
The alternator does
not
need
to
be polarized; therefore, never connect ground even momentarily
to either the regulator field terminal or
to
the alternator field terminals. Do not interchange leads
to
regulator as this will destroy the regulator.
CAUTION
Never under any circumstance permit a ground to contact the field
circuit even for an instant while power
is
applied to the system.
g.
The alternator should be in good condition and capable
of
producing full
output,
and the
alternator drive belt
must
be adjusted tight enough
to
prevent slippage.
h.
The
battery
must
be in good condition and should be fully charged.
i.
The voltmeter and ammeter should be
of
the best quality and should
be
accurate.
j. A carbon pile connected across the
battery
may be used to load the charging circuit while testing
the regulator.
Reissued: 10 /
11
/79
ELECTRICAL
SYSTEM
2Gll
To Next Page