User's Manual

SBS
-
900 Shore
Ba
Ba
sed
Radar Systems
Chapter
10
10
:
Corrective maint
enance
KH
KH
-
1602 2
issue 1
:
Standard SBS900 Systems Operator & Maintenance Handbook
Page
193
of
240
10.8.7.4
Fan
replacement
Replacement fan
part numbe
r: 45
-
690
-
0080
003
Note: The replacement part is the fan only and does not contain the casework which must be removed from the faulty fan.
Fan life:
The two fans mounted on the RDU power supply have
a manufacturers
MTBF
(mean
time between failure)
of 50
000
hours. It is therefore recommended that the fans are
changed every 5 years as part of the routine maintenance procedures.
PSU operation:
In the event of a
failure,
a
fan failure
warnin
g is
displayed on
the RDU
front panel
,
service displa
y or command and display system.
The power unit continues to operate
when a fan fails; t
he faulty
unit must be
replaced
as soon as possible
Replacement:
Firstly identify which of the two fans
on the
power
unit
is inoperativ
e, fan (A) is the
lower fan, fan (B) is the upper fan.
WARNING
:
Prior to commencing any maintenance
procedure
, users must familiarise
themselves with the health
&
safety warnings noted in the planned maintenance
and
health and safety
section
s
of the system handbook
.
AC supplies:
Prior to carrying out
any
maintenance, t
he system must be
fully isolated
and disconnected
from the single and 3
-
phase AC supplies
. See
system isolation
in the
planned maintenance section of the system handbook.
UPS (Uninterruptable Power Supply):
Where connected, ensure that UPS supplies to
the RDU are fully isolated prior to carrying out
any
maintenance task on the system.
It is not
necessary to remove the power unit to replace the fan.
The fan is mounted in a removable case which is mounted on the
PSU chassis and restrained by a single screw and four locating
lugs.
Remove the screw and unplug the fan from the power unit.
Noting th
e orientation of the fan and the cable position, remove the
fan from its case which is retained by four nuts, bolts and washers.
Checking the direction of the airflow (blows out from the power
unit), s
ecure the replacement fan into the case using the orig
inal
nuts, bolts and washers.
Place the fan assembly onto the PSU chassis and secure with the
single screw removed earlier.
Caution
: ensure the power cable exits the casework as shown and
is not trapped under the case.
Reconnect the power to the system,
switch on and check that:
-
The replacement fan is operational.
-
The
fan fail warning messages
is no longer displayed on the
RDU, service display and
command and display system.