Vector-LP Radio Beacon Transmitter Technical Instruction Manual
Page
3-5
Section 3 Operating Instructions
Issue 1.1
Table 3-1:
Front Panel - System Diagram Controls and Indicators
PANEL MARKING
DESCRIPTION
Exciter
When turned on (red), typically indicates a failure has occurred in
the active exciter (side A or B). This alarm will initiate a changeover
in dual transmitters; the side of the transmitter designated as
standby will be operating as the active side.
Low Voltage Power
Supply
When turned on (red), indicates a failure has occurred in one of the
LVPS modules (U2 or, if installed, U3).
AC Mains
When turned on (red), indicates the ac voltage applied to the
transmitter has fallen below an acceptable level. If the battery
backup option is installed, the power source switches to battery
mode. If no battery is available, the transmitter’s RF output is
inhibited.
Power Supply
When turned on (red), indicates a fault has occurred in one or more
of the switching power supplies that supply the RF power modules
This alarm will initiate a changeover in dual transmitters; the side of
the transmitter designated as standby will be operating as the active
side.
External Alarm
When turned on (red), indicates the external interlock circuit is not
presenting a closed circuit (inhibiting RF power)
OR
the ATU
(optional) or site interface PWB (optional) are not responding
OR
the
battery voltage is below the user established threshold.
Changeover
When turned on (red), indicates a changeover to the standby side
has been enabled due to a fault in the main side.
IPA/PA
When turned on (red), indicates a fault has occurred in one of the
RF power modules (A12 or, if installed, A13). This alarm will initiate
a changeover in dual transmitters; the side of the transmitter
designated as standby will be operating as the active side.
Output Network
When turned on (red), indicates the transmitter’s RF power is being
cut back or shut back due to an impedance mismatch (high VSWR)
at the transmitter’s output.
NOTE
In each case, root-cause details of the fault are displayed in the
diagnostic display’s
Events Logs
(see paragraph 3.6.5)
