Field Service Procedure – Replacement PCU Kit, Coastal
Page
1
of
9
Document No
135553 Rev A
Copyright © Sea Tel, Inc 2012 - The information contained in this document is proprietary to Sea
Tel, Inc. This document may not be reproduced or distributed in any form without prior written
consent of Sea Tel, Inc.
1.
Brief
Summary:
Troubleshooting
document
for
diagnosing
a
fault
with
and
replacing
the
PCU
assembly
on
the
coastal
series
antennas.
2.
Checklist:
Initialization
Rate
Sensor
Outputs
Run
the
Built
‐
In
Test
(BIT)
3.
Theory
of
Operation:
The
Coastal
series
are
two
axis
antennas
(elevation
and
azimuth)
with
a
motorized
polarization
assembly
to
keep
the
LNB
in
the
correct
reception
position
under
dynamic
conditions.
The
PCU
assembly
houses
a
motherboard
PCB
for
stabilization
and
motor
drive
and
a
DVB
receiver
for
tracking
the
RF
signal.
The
PCU
motherboard
is
responsible
for
the
stabilization
of
the
antenna,
housing
a
fluid
filled
tilt
sensor
which
acts
as
the
horizon
reference
for
elevation
and
pol
axis
and
3
rate
sensors
for
stabilization
for
the
azimuth,
elevation
pol
axis.
When
motion
is
detected
by
the
relevant
rate
sensor
the
PCU
motherboard
will
issue
the
drive
the
move
the
axis
the
opposite
amount
maintain
stabilization.
No
gyro
connection
is
integrated
in
the
system,
when
searching
the
antenna
targets
in
elevation
based
on
the
vessels
GPS
position
and
desired
satellite,
the
azimuth
axis
then
sweeps
and
searches
for
signal
above
threshold.
Once
the
NID
for
the
desired
satellite
has
been
decoded
tracking
will
be
enabled.
The
DVB
receiver
in
the
PCU
takes
a
feed
directly
from
the
LNB
to
receive
the
satellite
signal
and
will
also
decode
the
NID
(Network
Identity)
from
the
carrier
the
antenna
is
tracking,
as
the
output
of
the
receiver
is
passed
to
the
multi
‐
switch.
4.
Initialization:
Verify
the
initialization
of
the
pedestal:
1.
Power
cycle
the
DACP
control
panel
(this
provides
the
12VDC
to
power
the
pedestals
PCU).
2.
The
control
panel
will
then
display
the
following
software
versions:
DACP,
antenna
model
preset
in
the
PCU,
PCU
software
version,
DVB
software
version,
antenna
serial
number
and
elevation
encoder
engagement
(if
applicable).
3.
“Initializing”
will
then
be
displayed
with
a
flashing
“0”
until
the
GPS
position
have
been
acquired
at
which
point
the
“0”
will
turn
into
a
“*”.
4.
The
elevation
axis
will
drive
down
onto
its
end
stop,
if
an
encoder
is
installed
it
will
be
calibrated
at
this
point,
if
not
this
position
will
be
recognized
as
zero
and
the
stepper
motor
will
count
the
increments
of
elevation
drive.
5.
The
pol
motor
will
drive
to
its
“P90”
position
at
which
point
the
LNB
will
be
vertical
(if
using
a
system
with
a
motorized
pol
assembly).
6.
The
elevation
axis
will
then
drive
to
45
degrees.
7.
Once
the
initialization
process
is
complete
the
antenna
will
target
the
last
preset
satellite.
Summary of Contents for Coastal
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