NV5/NV3.5 Troubleshooting Manual Responding to alarms
Page 1-10 Issue 3.2 2014-12-10
Controller: Fan PS A
(or B) High Temp
This alarm occurs if fan power supply module A (U7) or B (U8) is
reporting a high temperature alarm, indicating its operating
temperature has exceeded its internal threshold. This alarm is most
likely caused by a module fan failure or blockage. Allow the module to
cool and attempt to
Reset the alarm. Verify the module turns on and
its fan is operational. If the fan is not operational, inspect it for
possible blockage. If necessary, replace the fan supply module (see
“Fan, IPA and Module Power Supply Replacement” on page 1-43). If
the alarm persist after replacing the module, suspect the control/
interface PWB (A1) or interconnect cabling.
Controller: Fan PS A
(or B) Module Not
Present
This alarm occurs if fan power supply module A (U7) or B (U8) is not
being detected or has been removed.
Controller: Forward
Power Limiting
When the High Forward Power alarm is active, this alarm occurs if the
high forward power limiting threshold is exceeded [1.063 times the
maximum power setting for all modes; e.g., 5,846 W (NV5) or 4,384
W (NV3.5) for FM mode]. The transmitter will fold back the forward
power each time the threshold is exceeded. This alarm occurs only if
the exciter ALC cannot respond fast enough to transmitter load
changes. Suspect the control/interface PWB (A1).
Controller: Forward
Power Shutdown
This alarm occurs if the transmitter tries to reduce the forward power
below minimum due to repeated Forward Power Limiting alarms. The
transmitter latches off. See Controller: Forward Power Limiting for
troubleshooting tips.
Controller: High
Ambient Temperature
This alarm occurs if the ambient temperature sensed by the control/
interface PWB (A1) exceeds 60°C (140°F). Check the intake air
system.
Controller: High
Forward Power
This alarm occurs if the transmitter’s average forward power exceeds
the high forward power threshold [1.036 times the maximum power
setting for all modes; e.g., 5,698 W (NV5) or 4,274 W (NV3.5) for FM
mode]. This alarm occurs only if the exciter ALC cannot respond fast
enough to transmitter load changes. Suspect the control/interface
PWB (A1).
Controller: High PA
Dissipation
This alarm occurs when the calculated average power amplifier
dissipation exceeds 200 W.
Alarm (with Prefix) Description and Troubleshooting Action
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