Thales 421, Эксплуатация и обслуживание, Страница: 75 / 256

LLZ 421
Operation and Maintenance Operation
ILS 420
3−9
Ed. 01.07 SOAC
3.4 NORMAL OPERATION
3.4.1 Switching On DC Supply
CAUTION
Never switch on the installation unless the antenna or an adequate dummy load is cor-
rectly connected! Make sure that the switches on the AC/DC converter are in ON position.
After the alignment procedure is completed use the DC main switch TX1 and/or TX2 on front of the
power supply subrack to switch on the transmitter. The LCP initializes, the status window is shown
in the screen, the main status indication is set. NORMAL should light for operation.
3.4.2 Operating the Key−lock switch at LCP of the Station
Three station states can be set with the key−lock switch at the LCP of the Station:
REMOTE, LOCAL and MAINTENANCE (Fig. 3−1). The key−lock switch is set to ’REMOTE’ for normal
operational mode. ’Remote mode’ means the system is controlled by the remote equipment (e.g.
RCSE 443 or other).
− Position ’REMOTE’
The monitor system is enabled. It can change over or shutdown the transmitter on alarm condition.
Control commands from the remote site (e.g. RCSE or MCS) are enabled, local controls at the LCP
not available. The remote control unit shows the station status. The station is in operational mode.
A local or remote connected PC with the PC User Program (ADRACS or MCS) achieves according
to the password level to read out data (< level 3) or to control the station and to change parameters
(> level 2). Performing a login with a level >2 the indication ’Remote Maint.’ appears in the LCP
menu ’Show Alerts’. The station is then out of operation.
− Switch to position ’LOCAL’
’LOCAL’ is used to perform adjustments on site with the LCP (e.g. during flight check). The monitor
system is enabled but can be locally set to ’Monitor Bypass’ in the ’Control’ menu of the LCP. Con-
trol commands and parameter changes from the remote site (e.g. RCSE or MCS) are disabled.
Local controls at the LCP are available. The station is not in operational mode.
NOTE: The bypass mode should be set if operating values of monitor or transmitter have to be adjusted. ’Monitor Bypass’ inhibits
the shutdown of the system by the subassembly ECU (Executive Control Unit) of the station.
A local connected PC with the PC User Program (ADRACS or MCS) achieves according to the
password level to read out data (< level 3) or to control the station and to change parameters (>
level 2). The indication ’local’ appears in the LCP menu ’Show Alerts’. The station is then out of
operation.
NOTE: If the station was shutdown in key−switch position REMOTE by the tower it remains "off" in position LOCAL.
The setting to ’aerial’ on site depends then on the position of switch SW1/No.2 at the ECU. With the ECU −SW1/No.2 in posi-
tion ’open’ (default, Station Interlock enabled) the station can be set to ’aerial’ only with the key−lock switch turned to RE-
MOTE after arrangement with the tower to accept a changed RWY−bit (’on’) . Then turn to LOCAL again to continue work
on site. If the ECU −SW1/No.2 is or was set to position ’closed’ (Station Interlock bypassed, i.e. Standalone) it is possible
to set ’aerial’ also in key−lock switch position LOCAL
.
− Switch to position ’MAINTENANCE’
’MAINTENANCE’ is used to perform maintenance works on site. Compared to position ’LOCAL’
the monitor system is disabled: ’Monitor Bypass’ is permanently set and cannot be disabled. The
MAIN STATUS shows ’ALARM’. The station is not in operational mode.
A local or remote connected PC with the PC User Program (ADRACS or MCS) achieves according
to the password level to read out data (< level 3) or to control the station and to change parameters
(> level 2). The indication ’local’ appears in the LCP menu ’Show Alerts’. The station is then out
of operation.
Ed. 07.08