C.
BSCU The BSCU changes the analog signals from the brake-temperature monitoring unit into an ARINC 429 signal. The BSCU sends these data and the BRAKE HOT warning to the lower ECAM DU.
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Temperature Sensor - Principle
Figure 001
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Brake-Temperature Monitoring Unit
Figure 002
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2. Component Location
__________________
(Ref. Fig. 003, 004, 005)
The temperature sensor located on each brake is housed in the torque tube. A
brake-temperature monitoring unit is installed on each main gear.
The BSCU is installed on shelf 94VU in the electronics rack 90VU.
------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL| ZONE| ACCESS | ATA | | | | DOOR | REF.
------------------------------------------------------------------------------2GW MONITORING UNIT-BRK TEMP, R1 741 32-47-18 3GW MONITORING UNIT-BRK TEMP, L1 731 32-47-18 4GW SENSOR-BRK TEMP, WHEEL 3 741 32-47-15 5GW SENSOR-BRK TEMP, WHEEL 1 731 32-47-15 6GW SENSOR-BRK TEMP, WHEEL 4 741 32-47-15 7GW SENSOR-BRK TEMP, WHEEL 2 731 32-47-15
3. Operation/Control and Indicating
________________________________
A. Principle of Operation (Ref. Fig. 006, 007) Each brake-temperature monitoring unit receives the voltages from the two temperature sensors. After processing, the electronic circuits deliver a voltage proportional to the temperature of each brake heat-sink. This voltage varies between 1V and 9V, which corresponds to a temperature range of 0 to 999 deg.C (1830.20 deg.F). In the BSCU, the four voltage values are compared to a voltage corresponding to an overheat threshold of:
-300 deg.C (572.00 deg.F). If the temperature of a brake is more than 300 deg.C (572.00 deg.F), a BRAKE HOT warning message is shown on the upper ECAM DU.
R **ON A/C 051-099, 301-399, 401-499,
If the brake fans are installed, the HOT legend on the BRK FAN pushbutton switch comes on (the BRK FAN pushbutton switch is installed on panel 402VU).
**ON A/C ALL
The four ARINC 429 values go to the lower ECAM DU. When the brake temperature remains lower than the overheat detection threshold, the temperature values are shown green. The highest temperature has a green arc above it (if > 100 deg.C (212.00 deg.F)). When a temperature value exceeds the detection threshold it is shown amber. A difference between the temperature of two brakes higher than 100 deg.C increases the brightness of the temperature indication of the hottest brake.
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Temperature Sensor - Location of Brake-Temperature Monitoring Unit on Main Gear
Figure 003
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Brake Temperature Sensor - Component Location
Figure 004
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Brake Temperature Monitoring Unit - Component Location
Figure 005
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Brake Temperature Detection System
Figure 006
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Cockpit Indications
Figure 007
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B. Temperature Sensor to Brake-Temperature Monitoring Unit Connections The connections from the temperature sensor to the brake-temperature monitoring unit are in chromel-alumel. In the event of rupture of at least one wire of the thermocouple, the brake-temperature monitoring unit sends a high signal > 9V to the BSCU (normal range : 1V = 0 deg.C, 9V = 1000 deg.C (1832.00 deg.F)). The failure is detected and a flag comes into view on the ECAM DU. In the event of a short circuit between the two thermocouple connecting wires, the temperature indicated is low. In the event of a short circuit between the line and ground the temperature indicated is high. 90% of the electronic failures lead to an out-of-range signal < 1V or > 9V. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM LANDING GEAR 起落架8(25)
