(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 | ---------------------------------------------------------------------------- 中國航空網(wǎng) m.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320飛機維護手冊 AMM AIR CONDITIONING 空調 4(159)
