.-----+PAR
+
l/2W
2,200
OHM
11-22.
TESTING
REGULATOR.
PIPER
SENECA
II
SERVICE
MANUAL
L PRESS -
TO
- TEST
I NORMALLY OPEN
DC
I AMMETER
Figure 11-11. Testing Regulator
CARBON
PILE
BATTERY
a.
The procedure for testing the regulator whether on the airplane or on the test bench remains the
same. Connect the test meters and regulator wiring as shown in Figure 11-11.
b. All circuit connections should be clean and tight. This includes the test instrument connections
which must
not
come loose
or
open the charging circuit
at
any time while the system
is
operating.
c.
The voltmeter will
not
indicate the true regulator setting until the regulator has been operating in
the charging system or
on
the test bench for
at
least five minutes, at a charge rate
of
from
IO
to
15
amperes.
d. With the connections made
as
shown in Figure l l-11, start the engine and adjust its speed to
approximately 920
to
1250 RPM to obtain
3,000
to
4,000
alternator RPM. Turn on accessories
as
needed
to
establish a 10
to
15
ampere load value. Note
that
the
battery
charge current
is
indicated by the ammeter.
Therefore, the current value may change downward
at
the beginning
of
a test run. This will be especially
true
if
the
battery
was used for engine starting.
e. After one minute operating time, check the regulator operating voltage
as
indicated by the
voltmeter. Refer to Alternator Service Test Specifications, Paragraph 11-15 for the correct operating
voltage. The operating voltage is shown for the ambient temperature in which the regulator
is
operating.
f.
If
the voltmeter reading indicates
that
the operating voltage
is
not
within limits, lift the plastic
plug from top
of
regulator and adjust the voltage
to
the desired value. Replace the plug after adjustment.
Before condemning the regulator, recheck the alternator and the battery, making sure that they are
in
good
condition. Recheck
all
circuit connections and all wiring for unwanted resistance (voltage drop test).
Recheck
the
voltmeter for accuracy and repeat the entire operating test.
Reissued:
10/11/79
2G12
ELECTRICAL
SYSTEM
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