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Condition
Alarm Type
(Shading shows
grouping)
Initial Power On, no
-
alarms
Self Test fail
Critical
Normal Operation –
-
RF enabled
Normal Operation –
-
RF disabled
Fans (see note 1)
Minor
High temp,
Minor
Minor
High temp,
Critical
Critical (see note 2)
RF overdrive
Major
Major (see note 3)
RF Overdrive
Critical
Critical (see note 4)
Linearizer (see note
Critical
5)
Device health and
Critical
Internal Voltages
Sensor fault (see
Critical
note 6)
Device current (see
Critical
note 7)
VSWR minor (see
Minor
note 8)
VSWR critical (see
Critical
note 9)
Low input voltage
Major
(<26V)
Bias fault (factory
Critical
only) (see note 10)
Self-test fail (see
Critical
note 11)
Configuration fault
Critical
(EEPROM
checksum)
Note 1: Fan failure is considered a minor alarm since there is no immediate impact on
unit operation, the seriousness depends on ambient temperature, and the high
temperature critical alarm will eventually protect the unit from damage.
Note 2: High temp: will retry when the temperature drops by a hysteresis amount, if
there is no fan alarm.
Note 3: Whenever the overdrive protection mechanism (see above) requires added
attenuation for a sustained period equal to the alarm hysteresis time, an overdrive major
alarm is declared. This condition indicates that firmware has reduced amplifier gain, but
the amplifier output is not being overdriven. This threshold is typically 0.5 dB above
rated output power.
Note 4: This alarm indicates that the input level is of a value which cannot be attenuated
enough by the input attenuator. Shut down must happen fairly quickly (20-100 mS
tentative) to avoid tripping the circuit breakers and to avoid RF device failure. This
(Minor Alarms are shown by
Green and Yellow at the same
time)
Green LED
Yellow LED
Normal
Major
On
On
On
-
Fast Flash
-
On
On
On
On
-
-
-
On
-
-
-
--
-
-
-
-
-
-
On
On
-
-
-
On
-
-
-
-
-
-
Table 2 Alarm mapping for PA Module
Andrew Corporation – Power Amplifier Group
Propriety – Use pursuant to Company Instruction
Comments
Red LED
Critical
On
On for ½ - 1½ secs
On
-
-
1 Hz complete cycle
-
No action
-
Auto-recover
On
Shut down
-
Gain reduced, Auto-recover
On
Shut down
On
Shut down
On
Shut down
On
Shut down
On
Shut down
-
No action. 4 sec delay to turn on the LEDs
On
Shut down
-
Gain reduced, Auto-recover
On
Shut down
On
Shut down
On
Shut down
RF Power Amplifiers
Retry
-
-
-
-
-
Y
Y
Y
Y
-
-
-
-
Y
Y
Y
-
-
-
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