NV5LT/NV3.5LT TROUBLESHOOTING MANUAL
RESPONDING TO ALARMS
VERSION 3.3 2016-03-10
PAGE 4.1.19
Exciter A/B: Entered
Firmware Upgrade
(Firmware Upgr)
Exciter (red)
This alarm occurs when the exciter is in “firmware upgrade” mode. It
should only be displayed during a transmitter software upgrade.
Exciter A/B: External
Mute (Ext Mute)
-
This alarm occurs if the exciter has been muted (0 W) by the transmitter.
This is typical when the transmitter is in an ‘Rf off’ condition, or any other
condition that causes the RF drive to be inhibited (external interlock open,
etc.). If this alarm persists and there are no other causing conditions
present, check the transmitter link cable on the exciter.
Exciter A/B: External
Summary Alarm
-
Not displayed in AUI or UI status. Configurable as a remote output. This
alarms occurs if there are any external related alarms present. Check for
specific external related alarms and troubleshoot accordingly.
Exciter A/B: Fan Fail
Exciter (red)
This alarm occurs if the exciter's cooling fan has been enabled, but the fan
tachometer measurement is below 2000 RPM. This alarm limits the exciter
RF output power to 10 W; however, if the fan speed recovers to an
acceptable level, the exciter RF output power will recover to the correct
operating level. Inspect the fan and, if necessary, replace it. In dual exciter
systems, a changeover to the standby exciter will occur if the faulty exciter
is inhibited due to the fault or its operating power level is limited enough to
affect the transmitter RF output power level.
Exciter A/B: Fan Volts
Fail
-
This alarm is for information only and should only occur when there is no
Exciter Fan Volts present. Inspect the LVPS-A supply and circuitry and, if
necessary, replace.
Exciter A/B: FPGA
Test Failed (FPGA Fail)
Exciter (red)
This alarm occurs if the FPGA on the main exciter card is not responding.
This alarm prevents the exciter from producing modulation or RF power, and
may be the result of a failed software upgrade or a hardware failure on the
exciter/control PWB.
Exciter A/B: High PA
Dissipation (High PA
Diss)
Power Amplifier
(amber)
This alarm occurs when there is excessive power dissipation (approximately
300 W) in the exciter’s power amplifier.
Exciter A/B: High PA
Temperature (High PA
Temp)
Power Amplifier (red)
This alarm will inhibit the exciter if the heatsink temperature sensed within
the exciter’s power stage exceeds 85°C (185°F). This alarm will clear when
the heatsink temperature decreases to 75°C (167°F). This fault is likely
related to an associated fan failure or blockage
.
Exciter A/B: High SWR Exciter (amber)
This alarm occurs if the exciter is experiencing high reflected power (greater
than 17.5 W). Check the connection and the RF load at the exciter’s output.
Exciter A/B: Licensing
Error
Exciter (red)
This alarm should only occur if there is a fault with the memory on the
exciter. It indicates that the exciter has not been licensed for the current
mode of operation.
Device and
Alarm Name
(AUI, UI)
Front Panel LED
(color)
Description and Troubleshooting Action
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