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oil pressure increases, the cooler bypass valve opens;
oil runs in the IDG internal circuit.
As the oil warms up, the cooler bypass valve closes
and the oil flows through the fuel/oil heat exhanger.
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AC GENERATION - IDG COOLING SYSTEM - COLD CONDITIONS
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AC GENERATION - IDG COOLING SYSTEM
FILTER CLOGGED
A clogged filter indication is provided by a local
visual Delta Pressure pop-out Indicator (DPI).
In case of clogging indication, a DPI reset can be
done in some conditions and associated with maintenance
procedures.
When the filter is clogged, the relief valve opens.
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AC GENERATION - IDG COOLING SYSTEM - FILTER CLOGGED
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AC GENERATION - IDG COOLING SYSTEM
TEMPERATURE AND PRESSURE MONITORING
For overheat detection, oil temperature sensors
monitor the temperature of both input and output oil.
A pressure switch operates in the event of a loss of
charge oil pressure.
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AC GENERATION - IDG COOLING SYSTEM - TEMPERATURE AND PRESSURE MONITORING
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SELF EXAMINATION
When does the cooler bypass valve open?
A - When an overtemperature is detected.
B - During cold conditions operation.
C - When the filter is clogged.
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24 - ELECTRICAL POWER
24-21-00 AC GENERATION - IDG MONITORING
CONTENTS:
Temperature Monitoring
Temperature Rise Indication
Pressure Monitoring
Self Examination
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AC GENERATION - IDG MONITORING
TEMPERATURE MONITORING
If an overtemperature is detected at the IDG outlet,
the associated alarms are triggered.
If the temperature rises above 147°C, the ELEC ECAM
page is automatically displayed and the temperature
indication flashes. If the temperature exceeds 180°C,
the indication turns from green to amber.
Above 185°C, the MASTER CAUTION and IDG FAULT lights
come on, the single chime is triggered.
TEMPERATURE RISE INDICATION
If the temperature rise indication is over a given
limit, a signal is sent to the CFDIU through the Ground
Power Control Unit.
GPCU: Ground Power Control Unit.
CFDIU: Centralized Fault Display Interface Unit.
Message on the MCDU: IDG 1 (or 2) HIGH DELTA TEMP
(class 2 failure).
PRESSURE MONITORING
In case of loss of charge oil pressure the
corresponding indications and warnings are triggered
only when the corresponding engine is running.
The low pressure warning is inhibited, for IDG
input speed below 2000 RPM
(Normal input speed range: between 4500 and 9120 RPM).
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AC GENERATION - IDG MONITORING
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