3. Power Supply
____________ The ELAC 1 is supplied from a DC essential busbar 4PP, the battery 1 taking overinstantaneously through a dedicated diode device (Power Supply Decoupling Unit) when the voltage level drops below the battery output voltage. A relay ensures the battery supply line breaking on the ground 30s after the second engine shut down. (Ref. Fig. 002) The ELAC 2 is normally supplied from the normal busbar 2PP. In case of loss of this busbar (particularly after the loss of both main generation channels, or after a double main TRU failure), this supply is automatically switched over to the battery 2 by means of two relays, for a fixed period of 30s.
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 (Ref. Fig. 003)
R **ON A/C 151-199, 301-399, 401-499,
 (Ref. Fig. 003A)
 **ON A/C ALL
 These relays are automatically re-energized if later on the blue hydraulic pressure falls and during the landing phase as soon as the nose landing gear is extended.
 4. Component Description
_____________________
 A. General The ELAC is in the form of a case to ARINC 600 standard. There are 10 electronic boards which are plugged in from the front of the unit when opened. The COM unit (5 boards) and MON unit (5 boards) are separated by a center partition. Each unit has its own power supply board located close to the longitudinal mid plane. The 10 electronic boards are as follows: (Ref. Fig. 004)
 -MON unit:
 . MAN: Monitor Analog board
 . MPU: Monitor Processing board
 . MDG: Monitor Digital board
 . MSP: Monitor Slave Processing board

 ELAC 1 Power Supply (Principle)
 Figure 002
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1  1  Feb 01/98
 1  1
 1CES  1

 ELAC 2 Power Supply (Principle)
 Figure 003

R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 27-93-00Page 5 1 1 May 01/05 1 1 1CES 1

 ELAC 2 Power Supply (Principle)
 Figure 003A

R 1EFF : 151-199, 301-399, 401-499, 1 27-93-00Page 6 1 1 Aug 01/05 1 1 1CES 1

 ELAC - Location of Boards Figure 004
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 . MPS: Monitor Power Supply
 -COM unit:
 . CPS: Command Power Supply
 . CDG: Command Digital board
 . CPU: Command Processing board
 . CAN: Command Analog board
 . CSP: Command Slave Processing board

 (1) Leading Particulars The main characteristics are summarized in the table below:
 -------------------------------------------------------------------------------I ELECTRICAL CHARACTERISTICS I I-----------------------------------------------------------------------------I I POWER SUPPLY I 28 VDC I I CONSUMPTION I < 100 W I -------------------------------------------------------------------------------
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 -------------------------------------------------------------------------------I I N P U T S I I-----------------------------------------------------------------------------I I ANALOG I ANI 1 : 4 (COM), 4 (MON) I SIDE STICKS I I I ANI 2 : 6 (COM), 6 (MON) I SURFACE POS. TRANSDUCER I I I ANI 3 : 0 (COM), 2 (MON) I SV SELECTOR VALVE TRANSDUCER I I I ANI 4 : 6 (COM), 6 (MON) I ACCELEROMETERS, PRESSURE TRANSMITTERSI I I ANI 7 : 0 (COM), 4 (MON) I SOL V SELECTOR VALVE TRANSDUCER I I I I I I DIGITAL I DGI 1 (HIGH SPEED) I ASSOCIATED UNIT I I I DGI 2 (HIGH SPEED) I ADIRS (IRS) I I I DGI 3 (HIGH SPEED) I ADIRS (IRS) I I I DGI 4 (LOW SPEED) I FMGC 1 I I I DGI 5 (LOW SPEED) I FMGC 2 I I I DGI 6 (LOW SPEED) I ADIRS (IRS) I I I DGI 7 (LOW SPEED) I ADIRS (IRS) I I I DGI 8 (LOW SPEED) I TESTS I I I DGI 9 (LOW SPEED) I ASSOCIATED UNIT I I I DGI 10 (LOW SPEED) I RADIO ALTIMETER I I I DGI 11 (LOW SPEED) I SFCC I I I DGI 12 (LOW SPEED) I FCDC I I I DGI 13 (LOW SPEED) I SPARE I I I DGI 14 (LOW SPEED) I SEC I I I DGI 15 (LOW SPEED) I OTHER ELAC I I I I I DISCRETE I 56 (COM), 56 (MON) I -------------------------------------------------------------------------------
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 -------------------------------------------------------------------------------
I O U T P U T S I I-----------------------------------------------------------------------------I I 5 ANALOG I ANO 1 I L ELEVATOR SERVO VALVE CURRENT I I(COM only)I ANO 2 I R ELEVATOR SERVO VALVE CURRENT I I I ANO 3 I THS MOTOR CURRENT I I I ANO 4 I R AILERON SERVO VALVE CURRENT I I I ANO 5 I L AILERON SERVO VALVE CURRENT I I I I I I DIGITAL I DGO 1 I TO SEC, FAC and BSCU I I I DGO 2 I FCDC I I I DGO 3 I SPARE I I I DGO 4 I ASSOCIATED UNIT I I I DGO 5 I OPPOSITE ELAC I I I I I DISCRETE I 14 (COM), 14 (MON) I I I I I RELAY I 13 (COM), 13 (MON) I ------------------------------------------------------------------------------I
　
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