Field Service Procedure – Replacement PCU Kit, ST88, ST94 & ST144
Page
2
of
22
Document No
137738 Rev A
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consent of Sea Tel, Inc.
4.
Verify
Initialization:
Power
cycle
the
pedestal
1.
Brakes
release
from
the
EL
and
CL
motors
2.
Elevation
axis
drives
to
45
degrees
based
on
the
motion
platform
PCBs
horizon
reference
3.
Cross
level
axis
drives
to
level
based
on
the
motion
platform
PCBs
horizon
reference
4.
Azimuth
axis
drives
clockwise
until
the
home
flag
and
sensor
make
contact
*Note:
If
the
PCU
software
is
2.01a
or
higher,
the
EL
and
CL
axis
will
initialize
at
the
same
time
saving
20
seconds
on
the
initialization
process.
If
the
ACU
reports
model
"xx09",
the
PCU’s
N0
parameter
needs
calibrating,
refer
to
the
“calibrating
the
PCU
System
Parameter
(N0)”
section
of
this
document.
Failure
of
any
of
the
initialization
steps,
or
a
pedestal
error
requires
further
troubleshooting.
5.
Power
Supply
Troubleshooting:
*Caution:
Electrical
Hazard
‐
Dangerous
AC
voltages
exist
on
the
power
supply.
Observe
proper
safety
precautions
when
working
on
the
power
supply.
1.
Remove
the
cover
from
the
PCU
to
allow
access
to
the
power
supply
for
testing.
2.
Measure
the
input
voltage
into
the
power
supply
on
the
2
pins
to
the
right
of
the
connection
block,
110
‐
240
volts
AC
should
be
present.
If
no
AC
voltage
is
present
verify
the
unit
is
switched
on.
If
there
is
still
no
voltage
present
troubleshoot
the
source.
3.
Now
measure
the
output
voltage
from
the
power
supply
on
the
2
pins
to
the
left
of
the
connection
block,
the
output
should
be
24VDC.
*Note:
This
procedure
shows
a
DAC
‐
2202
in
the
images;
however
the
DAC
and
PCU
power
supply
is
the
same
component
so
the
procedure
is
the
same.
If
the
units
AC
input
has
been
verified
and
the
24VDC
is
not
present,
the
power
supply
is
defective.
If
the
power
supply
is
outputting
the
24VDC
consistently
then
the
power
supply
is
operational
and
the
problem
lies
elsewhere
(possible
failure
with
the
PCU,
DAC
motherboard
or
harness
connection).
Summary of Contents for ST144
Page 1: ......