DOC AIRBUS | AMM A320FELECTRICAL POWER SUPPLY - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. Description
The ignition system requires 115VAC -400HZ power supply. The power is delivered via the EIU to the FADEC system and associated relay box.
The ignitor A is powered from the 115VAC ESS bus 401XP or from the 115VAC STAT INV BUS 901XP in the emergency configuration, and the ignitor B is powered from normal bus (103XP for engine 1 and 204XP for engine 2).
The availability of this 115VAC power to relay box is controlled by the EIU according to:
The ignition exciters transform the 115V - 400Hz current into high voltage pulsating current. This current charges internal capacitors.
The discharge rate is of 1.5 to 2.5 sparks per second and the energy delivered is 4 joules.
Each engine has two independent ignition exciters A and B. Ignition system A comprises the upper ignition exiter and its associated cable and igniter, ignition system B comprises the lower ignition exiter and its associated cable and igniter.
The two exciters for each energization are controlled by EEC and can be operated independently (starting sequence on ground) or simultaneously (continuous ignition). The EEC selects alternately each ignition system to avoid dormant failure and premature wear of igniter plugs.
The ignition system requires 115VAC -400HZ power supply. The power is delivered via the EIU to the FADEC system and associated relay box.
Electrical SupplyThe ignitor A is powered from the 115VAC ESS bus 401XP or from the 115VAC STAT INV BUS 901XP in the emergency configuration, and the ignitor B is powered from normal bus (103XP for engine 1 and 204XP for engine 2).
The availability of this 115VAC power to relay box is controlled by the EIU according to:
- The MASTER control switch position : no power is supplied to the relay box when the MASTER switch is set to OFF.
- ENG FIRE pushbutton switch position : no power is supplied to the relay box when the ENG FIRE pushbutton switch is pushed.
The ignition exciters transform the 115V - 400Hz current into high voltage pulsating current. This current charges internal capacitors.
The discharge rate is of 1.5 to 2.5 sparks per second and the energy delivered is 4 joules.
Each engine has two independent ignition exciters A and B. Ignition system A comprises the upper ignition exiter and its associated cable and igniter, ignition system B comprises the lower ignition exiter and its associated cable and igniter.
The two exciters for each energization are controlled by EEC and can be operated independently (starting sequence on ground) or simultaneously (continuous ignition). The EEC selects alternately each ignition system to avoid dormant failure and premature wear of igniter plugs.
(1) General
There are 2 ignition exciters which are mounted on the right hand side of the high pressure compressor front casing. The exciters provide starting and continous duty ignition on demand.
There are 2 ignition exciters which are mounted on the right hand side of the high pressure compressor front casing. The exciters provide starting and continous duty ignition on demand.
(2) Description
The ignition exciter is a capacitor discharge type exciter requiring an input of 115V (106 to 120 volts AC) at 400Hz (370 to 430 Hz). The output voltage is 22 to 26KV.
The ignition exciter is a capacitor discharge type exciter requiring an input of 115V (106 to 120 volts AC) at 400Hz (370 to 430 Hz). The output voltage is 22 to 26KV.