V10/V7.5/V5/V3.5 Installation and Operation Manual Page 3-5
Section 3 Operating Instructions Issue 3.5
Table 3-1: Front Panel - System Diagram Controls and Indicators
PANEL MARKING DESCRIPTION
Exciter
When turned on (red), typically indicates the active exciter’s (A14 or
A15) RF output to the active IPA module is above or below the pre-
set range, OR communication between the transmitter and exciter
(M50 only) has failed, assuming a serial link exists OR an audio loss
has occurred in the exciter. This alarm will initiate a changeover in
dual exciter transmitters; the exciter designated as standby will be
operating as the active exciter.
Low Voltage Power
Supply
When turned on (red), indicates one (single) or both (dual) LVPS
modules (U11 or U12) or fan supply modules (U13 or U14) has
failed. This alarm will initiate a changeover in dual fan power supply
transmitters; the fan power supply module designated as standby
will be operating as the active module.
AC Mains
When turned on (red), indicates the ac voltage applied to the
transmitter, is below an acceptable level. Transmitter will shut down.
Power Supply
When turned on (red), indicates a fault has occurred in one or more
of the switching power supply modules that supply the IPA and RF
power modules. Depending on the options installed, the transmitter
may initiate a changeover to the standby IPA power supply module
or operate at a reduced power level or be shut down. May also
indicate that the backup battery’s voltage is below an acceptable
threshold.
External Alarm
When turned on (red), indicates the external interlock circuit is not
presenting a closed circuit. Transmitter will be shut down.
Changeover
When turned on (red), indicates a changeover to the standby
exciter/IPA/IPA PS/fan PS module (as applicable) has been enabled
due to a fault in the main exciter/IPA/IPA PS/fan PS module.
IPA/PA
When turned on (red), indicates a fault has occurred in one of the
IPA or RF power modules. In the case of an IPA module fault, a
changeover will be initiated (for dual IPA transmitters); the IPA
designated as standby will be operating as the active IPA. In the
case of an RF power module fault, the transmitter will continue to
operate at a reduced power level.
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 OR the forward power level has exceeded
an acceptable level (while ALC is disabled) OR the forward power has
been decreased below 1630 W (V10)/1223 W (V7.5)/815 W (V5)/
612 W (V3.5) (due to SWR foldback) OR one of the combiner’s
cooling fans has failed OR the power level or temperature in one of
the hybrid combiner’s reject loads has exceeded an acceptable level.
NOTE
In each case, root-cause details of the fault are displayed in the
diagnostic display’s Events Log (see paragraph 3.6.6)
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