Smiths Kelvin Hughes Nucleus 3 5000 Series, System Handbook

Page: 493 / 510

RIU SYS TEM STARTUP FAULT BY PASS
FA CIL ITY
40 The RIU incorporates a backup mode, to ensure that
radar is available even when the RIU is faulty. If an
RIU Failed warning is displayed, when starting up the
system, the bypass facility can be used to connect each
display up to its corresponding RIU. This involves switching
off the displays, re-configuring the connectors and links on
the RIU and switching the displays back on.
41 When the dc power is interrupted (turning OFF the
switch on the outside of the unit) channels 1 & 2 are
automatically switched so that display 1 is directly connected
to transmitter 1 and display 2 is directly connected to
transmitter 2.
42 It is also pos si ble to set chan nels 3 and 6 to be di rectly
con nected, but this re quires mov ing con nec tors and
chang ing link settings. Refer to paragraphs ? To ?, for further
information.
43
If an RIU failure occurs the screen display will be as
shown below.
44
After a short delay (10 seconds, approximately), the
automatic bypass facility will switch the connections so
that display 1 is directly connected to transceiver 1 and
display 2 (NOT Shown) is directly connected to transceiver
2. This is indicated by the warning message "RIU BYPASS
MODE CONTROLLING TX 1" appearing on the right-hand
side of the screen, as shown below.
45
Almost immediately the RIU communications will be
recovered and the message "RIU COMMUNICATION
RECOVERED" is displayed on the right-hand side of the
screen, as shown below.
Man ual Switch Con fig u ra tion
46 To reconnect displays 3 to 6 directly to transceivers 3
to 6:
(1) Switch off ALL displays.
(2) Set the On/Off switch of the RIU to the OFF
position.
(3) Reconfigure the RIU for direct connection, as
detailed in paragraphs 48 to51.
(4) Switch on all displays.
47
To return to normal operation, once the fault has been
cleared:
(1) Switch of ALL displays
(2) Reconfigure the RIU for normal operation
(3) Set the On/Off switch on the RIU to the ON
position.
(4) Switch on all displays
NOTE:
It is recommended that where the system comprises more
than 2 transceivers and 2 displays, channels 1 and 2 of the
RIU are used in preference to other channels, to allow the
automatic bypass facility for those channels to be used if
required.
Man ual Switch ConfigurationChannel 3 (Dis play 3 di rect
to Trans mit ter 3)
48 To manually configure channel 3 to have direct
connection from display 3 to transmitter 3, the following
links and connectors must be moved:
(1) Move the display plug in PLC to PLG on the RIU
Processor PCB
(2) Move the following links on the RIU Video/Sync
switching PCB from A to B
Sync in LK9
Sync out LK15
Video in LK1
Video out LK5
Oct 01 8e.14 Amdt. 2
KH 2020
Chap 8e
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