DOC AIRBUS | AMM A320FPOWER INDICATING - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The power indicating system monitors the APU speed in revolutions per minute (rpm). Two speed sensors transmit a signal to the ECB 59KD. The ECB 59KD gives a speed signal to the Electronic Instrument System (EIS). The EIS shows the APU speed in percent on the APU system page at the lower ECAM display unit.
** ON A/C NOT FOR ALL The power indicating system monitors the APU speed in revolutions per minute (rpm). Two speed sensors transmit a signal to the ECB 59KD. The ECB 59KD gives a speed signal to the Electronic Instrument System (EIS). The EIS shows the APU speed in percent on the APU system page at the lower ECAM display unit.
** ON A/C NOT FOR ALL
Power Indicating - Component Location3. System Description
The power indicating system shows the APU speed on the EIS. Two speed sensors are installed in the gearbox casing. Each of the speed sensors is connected to the ECB 59KD. The ECB 59KD receives the speed signals from the speed sensors and transmits the speed signal to the EIS. The EIS shows the APU speed in percent on the lower ECAM display unit.
A Permanent Magnet Generator (PMG) is connected to the ECB. The PMG is installed in the cooling fan of the accessory cooling system (Ref. AMM D/O 49-52-00-00). The ECB receives the PMG speed signal and uses it for the back-up overspeed protection.
** ON A/C NOT FOR ALL The power indicating system shows the APU speed on the EIS. Two speed sensors are installed in the gearbox casing. Each of the speed sensors is connected to the ECB 59KD. The ECB 59KD receives the speed signals from the speed sensors and transmits the speed signal to the EIS. The EIS shows the APU speed in percent on the lower ECAM display unit.
A Permanent Magnet Generator (PMG) is connected to the ECB. The PMG is installed in the cooling fan of the accessory cooling system (Ref. AMM D/O 49-52-00-00). The ECB receives the PMG speed signal and uses it for the back-up overspeed protection.
4. Interface
The power indicating system has interface with the Control and Monitoring System (Ref. AMM D/O 49-61-00-00).
** ON A/C NOT FOR ALL The power indicating system has interface with the Control and Monitoring System (Ref. AMM D/O 49-61-00-00).
5. Component Description
A. Speed Sensor
The speed sensor has:
At 100% APU speed the speed sensors give a frequence of approximately 19720 Hz.
The speed sensors give the frequency in proportion to the APU speed.
The speed sensor has:
- a permanent magnet,
- a pole piece,
- a coil,
- a housing.
At 100% APU speed the speed sensors give a frequence of approximately 19720 Hz.
The speed sensors give the frequency in proportion to the APU speed.
6. Operation/Control and Indicating
A. Operation
The speed sensors measure the APU speed and transmit a frequency to the ECB. The ECB monitors the power indication during all APU operating conditions (Ref. 49-61-00).
The ECB starts the automatic shutdown sequence if both speed sensors are defective.
The PMG transmits a speed signal to the ECB. This speed signal is used by the back-up overspeed protection.
The speed sensors measure the APU speed and transmit a frequency to the ECB. The ECB monitors the power indication during all APU operating conditions (Ref. 49-61-00).
The ECB starts the automatic shutdown sequence if both speed sensors are defective.
The PMG transmits a speed signal to the ECB. This speed signal is used by the back-up overspeed protection.
B. Control and Indication
The lower ECAM display unit shows the APU speed in percent on the APU page (Ref. AMM D/O 49-00-00-00).
The lower ECAM display unit shows the APU speed in percent on the APU page (Ref. AMM D/O 49-00-00-00).