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B. Vacuum Generator 37MG (1) The vacuum generator is connected to the aircraft power circuit through the motor starting relay (36MG). The generator operates: -At ground level and up to an altitude of 5487 m (18000 ft.) (the altitude pressure switch stays closed. It sends an electrical signal to the VSC to operate the vacuum generator). -When the toilet flush switch is operated (the FCU sends an electrical signal to the VSC which energizes the motor starting relay). This supplies power to the vacuum generator. NOTE : After 15 seconds the motor start relay is isolated and ____ electrical power to the generator is stopped. (2) Vacuum generator overheat protection: The VSC monitors the thermal switch circuit (overheat protection) of the vacuum generator. When an overheat occurs the thermal switch opens. This sends an electrical signal to the VSC and stops electrical power to the vacuum generator. C. Altitude Pressure Switch 43MG The altitude pressure switch is connected electrically to the VSC and operates: -At ground level and altitudes up to 5487 m (18000 ft.) the altitude pressure switch stays closed -Above 5487 m (18000 ft.) the altitude pressure switch stays open -During altitude descent the switch closes at 4877 m (16001 ft.). The VSC monitors when the altitude pressure switch is open or closed. D. Landing Gear Signal One of the functions of the Landing Gear (LG) signal is to give the indication to the VSC (that the aircraft is on ground and the strut is compressed). The LG signal is also used as a back up for other primary indications. In general a single LG fault will have no effect on the vacuum waste system. The VSC will not generate a fault message if the LG signal is faulty, because the VSC BITE does not control the LG signal. R 1EFF : 052-055, 057-057, 1 38-31-00Page 42 1 1 Aug 01/05 1 1 1CES 1R **ON A/C 106-149, 301-399, 401-499,
B. Vacuum Generator 37MG (1) The vacuum generator is connected to the aircraft power circuit through the motor starting relay (36MG). The generator operates: -On ground, - If the differential pressure is less than 246 mbar during climb,
- If the differential pressure is less than 203 mbar during descent. The different pressure information comes form the SDAC. When the toilet flush switch is operated:
-The FCU sends an electrical signal (through the connected DEU B to the DIR 1-2 of the CIDS) which activates the motor starting relay. This supplies power to the vacuum generator. NOTE : After 15 seconds the motor start relay is deactivated and ____ electrical power to the generator is stopped. (2) Vacuum generator overheat protection: The DIR 1-2 controls the thermal switch circuit (overheat protection) of the vacuum generator. When an overheat occurs the thermal switch opens. This sends an electrical signal via the DEU B to the DIR 1-2 and stops electrical power to the vacuum generator. C. System Data Acquisition Concentrators (SDAC) The SDAC is electrically connected to the CIDS Director 1-2 (refere to as DIR 1-2). The signal from the SDAC is used for altitude operations of the vacuum generator: - During climb the vacuum generator is activated when the differential is less than 246 mbar,
- During descent the vacuum generator is activated when the differential
is less than 203 mbar. The Dir 1-2 monitors the operation of the vacuum generator. D. Landing Gear Signal One of the functions of the Landing Gear (LG) signal is to give the indication to the DIR 1-2 (that the aircraft is on ground and the LG is compressed). The LG signal is also used as a back up for other primary indications. In general a single LG fault will have no effect on the vacuum waste system. The DIR 1-2 will not generate a fault message if the LG signal is faulty, because the DIR 1-2 BITE does not control the LG signal. R 1EFF : 106-149, 301-399, 401-499, 1 38-31-00Page 43 1 1 Aug 01/05 1 1 1CES 1 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
E. Liquid Level Transmitter 40MG The LLT gives the waste content level of the waste holding tank from empty to full. It measures the hydrostatic pressure of the tank contents. The LLT is connected electrically to the VSC. It gives the VSC an analog signal for the waste content of the tank. The VSC calculates and transmits the signal to the Forward Attendants Panel (FAP) for waste quantity indication. F. Liquid Level Sensor 41MG The LLS is an ultrasonic type sensor it is connected electrically to the VSC. When the waste holding tank content level is at full, the LLS sends a signal to the VSC. When the VSC receives a tank full signal, (from the LLS) it shuts down the toilet systems and the SYS INOP legend on FAP comes on. Under normal operation the LLS has the priority to transmit tank full to the VSC. www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM WATER/WASTE 2
