PIPER
SENECA
II
SERVICE
MANUAL
Breaking this circuit disables the balancing circuits in
both
regulators.
c.
Operate the "RIGHT" engine at approximately 1750
RPM
and at a load
of
15
to 30 amperes for
approximately 5 minutes for warm-up; then turn the
"LEFT"
alternator switch
"OFF"
and set the RIGHT
voltage regulator
(to
the left while facing aft)
to
14.0-volts; then replace its plug button. This regulator
should require
no
further adjustment.
d. Connect a voltmeter between the two
"FIELD"
terminals, turn the LEFT alternator switch ON,
and adjust for minimum voltage; however, the voltage should
not
exceed 8-volts. This adjustment will be
"touchy,"
and polarity will reverse as zero
is
passed.
e.
Reconnect the
PAR
wire and note
that
the voltage as observed in Step 4 drops
to
less
than .5-volt
and becomes steady. Check that bus voltage
is
still 14.0-volts; then shutdown engine.
f.
Replace the plug in the regulator; remove all voltmeter leads and test equipment and install the
closeout panel in the baggage compartment.
11-24. OVERVOLTAGE RELAY.
11-25. CHECKING OVERVOLT AGE RELAY. The relay may be tested with the use
of
a good quality,
accurate voltmeter, with a scale
of
at least 20-volts and a suitable power supply, with an
output
of
at least
20-volts, or sufficient batteries with a voltage divider
to
regulate voltage. The test equipment may be
connected by the following procedure:
a.
B+
is
connected to
"Bat"
of
the overvoltage control.
b.
B-
is
connected
to
the frame
of
the overvoltage control.
c.
Be
sure
both
connections are secure and connected
to
a clean bright surface.
d. Connect the positive lead
of
the voltmeter
to
the
"Bat"
terminal
of
the overvoltage control.
e.
Connect the negative lead
of
the voltmeter
to
the frame
of
the overvoltage control.
f.
The overvoltage control
is
set
to
operate between 16.5-volts to
17
.5-volts.
By
adjusting the
voltage an audible "click" may be heard when the relay operates.
g.
If
the overvoltage control does
not
operate between 16.5 and
17
.5-volts, it must be replaced.
Re~sued: 10/11/79
ELECTRICAL
SYSTEM
2G14
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