Nautel NV5, Troubleshooting Manual

Page: 16 / 228

NV5/NV3.5 Troubleshooting Manual Responding to alarms
Page 1-8 Issue 3.2 2014-12-10
Controller: Check
Active Exciter This alarm occurs when a non system inhibiting fault has occurred
within the active exciter. The transmitter will likely resume operation.
Examples of such faults are IBOC data loss, fan failure, high
temperature, or an exciter low voltage power supply rail voltage is out-
of-tolerance. Check for associated Exciter prefixed alarm(s) that may
have caused the failure and refer to their troubleshooting action.
Controller: Combiner
Matching Shutdown This alarm occurs if two or more RF power modules are reporting a
Module #: Output Network Shutdown alarm. The transmitter will be
inhibited until a reset occurs. The alarm is indicative of a transmitter
combiner fault. Contact Nautel.
Controller: CPLD
Compatibility Fault This alarm occurs when there is an incompatible software release in
the control/interface PWB’s CPLD. Update the software to clear the
fault or contact Nautel.
Controller: Cutback This alarm occurs whenever the transmitter experiences a cutback. A
cutback (reduction in power) occurs when repeated shutback alarms
occur within a prescribed time period. Shutbacks occur when the
transmitter’s peak reflected power exceeds 2:1 (600 W for all modes)
due to a transient SWR condition (arc or lightning) within the output
transmission line or antenna system. The transmitter shuts back and
recovers to a series of cutback levels (depending on the severity of
the alarm), with each level representing a 1/8th reduction in power
from the preset value. Attempt to reset the latched condition by
pressing
Reset
. Inspect the output transmission line for punctures or
damage. If no damage can be found, suspect a fault with the control/
interface PWB (A1).
Controller: Disable
Module # (1 -16) This alarm occurs if one or more of the RF power modules has been
disabled by the microcontroller on the control/interface PWB. This
may be caused when one or more IPA power supply failures occur,
resulting in the requirement to shut down IPAs to maintain the total
IPA current within the capabilities of the remaining IPA power
supplies. With one IPA power supply operational, this alarm should
not occur. Check for associated alarm(s) that may have caused the
failure and refer to their troubleshooting action.
Controller: EEP Fail
Configuration This alarm occurs if there is no valid EEPROM configuration data to
load. Various parameters will revert back to their failsafe default
values. See
“Controller: EEP Fail alarms” on page 1-24 .
Alarm (with Prefix) Description and Troubleshooting Action