Description
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t and its contents are the property of CASSIDIAN
nd must not be copied or circul
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2.4.3.3
Monitoring
The self-protective actions of the sub-assemblies are as follows:
• for the primary converter: in case of excess temperature (> + 95
°
C), the converter
switches off automatically.
• for the synchronisation board:
- collects the fan alarms
⇒
FAN alarm,
- collects the "Pilot" and "Chassis time" alarm
⇒
SYNC alarm,
- collects the alarms from the 1
st
duplexer
⇒
DX1 alarm,
- collects the alarms from the 2
nd
duplexer
⇒
DX2 alarm (if antenna diversity option),
- collects the alarms from the primary convertor
⇒
PWR alarm,
These alarms are transmitted to the 3G PA-TRX to be processed.
2.4.4
Fan chain
2.4.4.1
Air flow
The IDR IDO 3G contains principally 2 heating sub-assemblies: the 3G PA-TRX module
and the primary convertor.
The heat generated by the 3G PA-TRX module is evacuated via the radiator within the
module. The heat from the primary convertor is evacuated via the air holes and the small
fan secured to the front panel.
The 3G PA-TRX module's radiator and the chassis form a tunnel. The fans located at the
rear blow out to evacuate the heat dissipated by the radiator's fins.
2.4.4.2
Fan management
The fans operate regardless of the temperature inside the IDR IDO 3G rack; their rotation
increases if the temperature changes:
• up to 30 °C, minimum rotation at 2000 rpm,
• between 30 °C and 50 °C, linear rotation between 2000 and 6000 rpm (alarm if the
temperature is > 60 °C).
Self protection actions are also launched by the 3G PA-TRX module and the primary
convertor when the temperature becomes excessive.
