DOC AIRBUS | AMM A320FFMGS: ELECTRICAL POWER SUPPLY - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. Location of Circuit Breakers
The circuit breakers associated with the FMGS circuits are located on the overhead C/B panel (49VU) and the rear C/B panel (121VU) (Ref 22-00-00 for A/C General Power Supply).
** ON A/C NOT FOR ALL The circuit breakers associated with the FMGS circuits are located on the overhead C/B panel (49VU) and the rear C/B panel (121VU) (Ref 22-00-00 for A/C General Power Supply).
2. System Description
Power Supply of FMGCs(1) 28VDC Power Supply
The FMGCs are supplied with 28VDC.
The FMGCs are supplied with 28VDC.
(2) Miscellaneous
In addition to the 28VDC power supply, the following signals are fed to the FMGCs:
In addition to the 28VDC power supply, the following signals are fed to the FMGCs:
- chassis ground,
- side 1 signals (C and M) wired to the ground on the FMGC1 only (priority).
(1) 28VDC Power Supply
The FCU is supplied with 28VDC.
The chassis ground of the FCU is connected to the aircraft ground.
The FCU is supplied with 28VDC.
The chassis ground of the FCU is connected to the aircraft ground.
(2) Lighting
The FCU is supplied with three lighting power supplies:
The FCU is supplied with three lighting power supplies:
(a) Lighting voltages for engaged modes.
- The 5VAC/3VAC variable voltage is controlled by means of the INT LT/ANN LT switch located on the overhead panel (Ref. AMM D/O 33-14-00-00).
- At system or mode engagement, this voltage enables the illumination of the green indication on the corresponding pushbutton switch.
(b) FCU lighting voltage
- The 5VAC/3VAC variable voltage is controlled by means of a potentiometer located under the FCU (Ref. AMM D/O 33-13-00-00).
- This voltage enables the illumination of the front panel of the FCU.
(c) Integral lighting voltage
- The 5VAC/3VAC variable voltage is controlled by means of a potentiometer located under the FCU (Ref. AMM D/O 33-13-00-00).
Considering the dissipated power, this voltage is delivered to the FCU in two steps - This voltage is used for LCD and placard lighting.
(d) Lamp test
A lamp test signal can be fed to the FCU by means of the INT LT/ANN LT switch on the overhead panel (Ref. AMM D/O 33-14-00-00).
During the test, this signal activates the lighting of the LCD "engaged mode" indications and placards.
A lamp test signal can be fed to the FCU by means of the INT LT/ANN LT switch on the overhead panel (Ref. AMM D/O 33-14-00-00).
During the test, this signal activates the lighting of the LCD "engaged mode" indications and placards.
C. Side Stick and Rudder Pedals Locking Circuits
The aircraft 28VDC is delivered through relays controlled by the FMGCs to:
The aircraft 28VDC is delivered through relays controlled by the FMGCs to:
- the Captain and First Officer side-stick locking solenoids,
- the artificial feel stiffening solenoids (Ref. 22-11-00, Para. 2).
D. Power Supply of MCDUs
Power Supply of MCDUs and Carry on Data Loader
Power Supply of MCDUs and Carry on Data Loader
(1) 115VAC Power Supply
The MCDUs are supplied with 115VAC/400Hz. The connectors associated with the data loader are supplied with the same 115V as the MCDUs.
The MCDUs are supplied with 115VAC/400Hz. The connectors associated with the data loader are supplied with the same 115V as the MCDUs.
(2) Lighting Voltages
Each MCDU is supplied with two types of lighting voltages.
Each MCDU is supplied with two types of lighting voltages.
(a) Annunciator lighting
The 5VAC/3VAC voltage is controlled by means of the INT LT/ANN LT switch located on the overhead panel (Ref. AMM D/O 33-14-00-00).
The 5VAC/3VAC voltage is controlled by means of the INT LT/ANN LT switch located on the overhead panel (Ref. AMM D/O 33-14-00-00).
(b) Integral lighting
The 5VAC/3VAC variable voltage is controlled by means of the potentiometer associated with the center pedestal and instrument panel lighting (Ref. AMM D/O 33-13-00-00).
The 5VAC/3VAC variable voltage is controlled by means of the potentiometer associated with the center pedestal and instrument panel lighting (Ref. AMM D/O 33-13-00-00).
(c) Miscellaneous
1 Ground
In addition to the 115VAC ground, each MCDU receives a chassis ground as well as pin program ground(s) which determine the side.
A chassis ground is also wired to the FMS LOAD connectors.
In addition to the 115VAC ground, each MCDU receives a chassis ground as well as pin program ground(s) which determine the side.
A chassis ground is also wired to the FMS LOAD connectors.
2 Lamp test
The INT LT/ANN LT switch (Ref. AMM D/O 33-14-00-00) enables, through a discrete, the annunciator light test to be performed.
The INT LT/ANN LT switch (Ref. AMM D/O 33-14-00-00) enables, through a discrete, the annunciator light test to be performed.