A320飞机维护手册 AMM AIR CONDITIONING 空调 4(159)

曝光台 注意防骗 网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者

B. Operation in Failure Cases The system includes various back-up functions to make sure of safe operation during failure cases, these are as follows:
 (1)
 If the pack controller 7HH (27HH) primary computer fails the secondary computer controls at a reduced level. The ram-air doors will open to the maximum flight position and no further optimization takes place, (the flow control reference remains at its previous setting). Control of the water-extractor outlet temperature (to the level demanded from the zone controller 8HK) will still take place through modulation of the bypass valve 10HH (30HH). The overheat warning will still be available.

 (2)
 If the zone controller 8HK (or its communications) fail completely the pack controllers 7HH (27HH) take over control. They will limit the water extractor outlet temperature to 20 DEG.C (68.00 DEG.F) for pack 1 (10HM) and to 10 DEG.C (50.00 DEG.F) for pack 2 (11HM). If there is a failure (of the communications from the zone controller main computer and it remains active), the pack controllers take over control. They will limit the water extractor outlet temperature to 5 DEG.C (41.00 DEG.F) for pack 1 and to 10 DEG.C (50.00 DEG.F) for pack

 2. The zone controller can still use the trim-air system (Ref. 21-63-00) to increase the cabin inlet temperature, if necessary. The pack controllers still get the zone controller status signal from the zone secondary computer.
R 1EFF : 001-003, 051-054, 1 21-61-00Page A9 1 1 Aug 01/05 1 1 1CES 1 A flow priority mode is included in the pack controller primary computer. At low pack inlet pressure the bypass valve 10HH (30HH) (and the ram-air inlet/outlet doors) are modulated to a more open position and thus increase pack permeability.

 (3) The pack controller will detect a failure of the bypass valve function when:
 -
the bypass valve fails (either because of a valve actuator failure or because of a valve jam),

 -
the power output circuit of the primary channel fails.
 In both cases the secondary channel of the pack controller takes the
 control and opens the ram air doors to a limited position.
 If the power output circuit was the faulty function, the temperature
 will be controlled by the secondary channel and the bypass valve.
 If the bypass valve failure is effective, the ram air doors are
 controlled to a limited open position by the secondary channel to
 avoid overheating of the compressor.
 A failure of the primary channel of the pack controller is indicated
 on the CFDS by the message P1 CONT or P2 CONT.

 

R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399,
 A. Normal Operation In normal operation the primary computer of the pack controller 7HH (27HH) controls the system. The pack controller gets a temperature reference as a demand signal from the zone controller 8HK. This demand signal, the preferred bypass valve 10HH (30HH) position and the measured water extractor outlet temperature, and bypass valve position is used continuously to determine their necessary drive speeds. The speed is zero, when the water extractor outlet temperature gets to the required value and the bypass valve to the preferred position. The preferred bypass valve 10HH (30HH) position is normally 21 DEG. but is adjusted when necessary, dependent on pack inlet pressure. The water-extractor outlet temperatures are limited through the temperature demand signal from the zone controller 8HK. The upper limit is 70 DEG.C (158.00 DEG.F). The lower limits are as follows:
 (1) One or two packs operation
 ----------------------------------------------------------------------------
| 0 to 24000 ft | 5 DEG.C (41 DEG.F) |
 |--------------------------------------|-------------------------------------|
 | 24000 to 29000 ft | 0 DEG.C (32 DEG.F) |
 |--------------------------------------|-------------------------------------|
 | above 29000 ft | -30 DEG.C (-22 DEG.F) |
 --------------------------------------|-------------------------------------
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 21-61-00Page A10 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1

 (2) Compressor outlet temperature limits

 ----------------------------------------------------------------------------| up to 180 DEG.C (385 DEG.F) | normal operation | |--------------------------------------|-------------------------------------| | 180 DEG.C (385 DEG.F) to | reduced closing | | 220 DEG.C (428 DEG.F) | | |--------------------------------------|-------------------------------------| | at 230 DEG.C (446 DEG.F) | pneumatic temperature sensor | | | starts to close the flow control | | | valve | |--------------------------------------|-------------------------------------| | at 260 DEG.C (500 DEG.F) | overheat warnings to the ECAM | | | and the pack switches on overhead | | | panel 30VU | ----------------------------------------------------------------------------
　
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 AIR CONDITIONING 空调 4(159)