Click here to make tpub.com your Home Page

Page Title: Section IV. MAINTENANCE OF DETAIL NETWORKS
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home
   
Information Categories
.... Administration
 Advancement
 Aerographer
 Automotive
 Aviation
 Construction
 Diving
 Draftsman
 Engineering
 Electronics
 Food and Cooking
 Logistics
 Math
 Medical
 Music
 Nuclear Fundamentals
 Photography
 Religion
   
   

 
Back
Figure 3-8. Power switch printed circuit board assembly (A7).		Up
TM-11-6130-385-34 Inverter Static Power PP-7274/A (NSN 6125-00-148-8342) and PP-727 4A/A (NSN 6130-01-093-3077) Manual		Next
Section VI. OSCILLATOR AND MODULATOR PRINTED CIRCUIT

TM
11-6130-385-34
Figure 3-9 Fan bulkhead (A9).
Section IV. MAINTENANCE OF DETAIL NETWORKS
3-22.
General
plied
to
the
unit
until
it
has
been
opened
and
vidually
inspected
for
burned
or
otherwise
There
are
no
controls
or
indicators
on
the
static
damaged
components.
Where
failed
com-
inverter;
therefore,
performance
indications
must
be
ponents
are
located,
resistance
and
con-
measured
with
the
inverter
covers
removed
and
the
tinuity
checks
should
be
performed
to
isolate
inverter
placed
on
the
test
bench.
the
faulty
circuits
and
to
identify
the
cause
CAUTION
of
the
failure.
It
will
be
necessary
to
remove
Although
voltages
in
the
static
inverter
are
coating f r o m
leads
to
take
protective
+28
vdc
and
115
vac),
relatively
low
(e.g.,
readings.
current
levels
are
high
(up
to
41
amperes
in
normal
operation,
and
much
higher
in
short
3-23.
Checking
Procedure
circuit
situations).
As
a
result
failures
are
Check
the
detailed
networks
as
described
in
table
3-
often
catastrophic;
therefore,
unless
the
7.
Refer
to
table
3-7
and
figure
FO-1
to
supplement
symptoms
of
a
failure
are
known,
be
ex-
this
data.
tremely
careful
when
troubleshooting
the
static
inverter.
No
voltages
should
be
ap-
S e c t i o n V. INPUT FILTER AND CAPACITOR BANK
3-24. Input Filter
rf
impulse
noise
that
may
be
induced
on
the
28
vdc
bus.
A
low
frequency,
series
connected
choke
within
(fig.
3-10)
Nominal +28 vdc is applied through pin C of con-
the
filter
presents
a
high
impedance
to
400-Hz
nector A5J501 to the encapsulated filter A5. This
signals
generated
within
the
inverter.
low pass input filter is capable of receiving a variable
3-25. Capacitor Bank
input of from +18 to +32 vdc and can supply input
(fig.
3-10)
load currents of up to 41 amperes at +28 vdc. The
The
input
capacitor
bank
acts
as
a
storage
cell
for
encapsulated filter contains a high frequency choke
the
inverter.
Nominal
+28
vdc
is
applied
from
the
which presents a high impedance to voltage spikes or
Change 1
3-33

Privacy Statement - Press Release - Copyright Information. - Contact Us