BFGoodrich PS-823 - Page 37

BFGoodrich Avionics
Systems,
Inc.
Component Maintenance
Manual
P/N 101-1075-()
Corrective
Test
Procedure
NormalIndication
Active
2.5
Load
Voltage Check
Voltage across load
a. Disconnect batteries and
replace
them in
the
circuit
resistor
shall be
26.95V
with
a
200
Ohm
±3%,
10W
resistor.
±l.5Vdc.
b. Apply
28.0Vdc
input
thru
unit
connector
with S1
closed.
c. Adjust
Rl7 to
provide 36.5Vde at
A2-19
and
measure the
voltage
across load
resistor.
d.
Reset
Rl7
to
provide 23.5Vdc on Q9
emitter.
2.6 Timer Hysteresis
Place switch
S1
Off
for 10
seconds,
then
place
S
I Lamp
DS
I shall be dim.
ON.
2.7
Timer Recycle
Place
switch
SI
Off
for
2
minutes, then
place Sl Lamp
DSl
shall
ON.
illuminate
for a
minimum
of 60
seconds,
but less
than
170
seconds
(200
seconds
for
PS-823C,
D,
G, H).
2.8 Inverter Output
Voltage
(115
Vac) A uniform,
stable
square
wave
of
115.0Vac
+7%,
a. Connect the Emergency
Power
Supply
as
shown in
-10%,
400 ±8Hz
shall
be
the test
setup
of Figure
106.
evident
(see Figure
I
17).
b.
Connect the true
RMS voltmeter,
frequency
counter,
and oscilloscope across
load resistor Rl.
c.
With
switch S1 OFF,
apply 28.0Vde
to
pins
Jl-10
(+)
and
JI-12 (-).
d. Place
switch
S1 ON.
e.
Monitor
the voltmeter,
the frequency
counter,
and
the
oscilloscope.
2.9
Input Power Drain
a.
Apply 28.0Vdc
to
the Emergency
Power Supply
as
shown
in Figure 106.
b.
Place switch
S1
ON.
c. Monitor ammeter
M2.
Ammeter M2
indicates 4
d.
Place switch Sl OFF.
Amps, maximum
Performance Test
with "est
Setup
Figure
112
(Cor
t.)
msmljtp202TestFaultlsodiskl59
24-20-03
Page
117
Revision A June
30,
1999