DOC AIRBUS | AMM A320FELECTRICAL POWER SUPPLY - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. Description
The ignition system requires 115V, 400Hz from the electrical system via the ECU. The ECU controls excitation of ignition exciters A and B.
The ignition exciters transform the 115V - 400Hz current into high voltage pulsating current. This current charges internal capacitors. The stored energy is 5 to 8 joules. The discharge rate is of one per second and the energy delivered is 1.5 joules.
Each engine has two independent ignition exciters
The ignition system requires 115V, 400Hz from the electrical system via the ECU. The ECU controls excitation of ignition exciters A and B.
The ignition exciters transform the 115V - 400Hz current into high voltage pulsating current. This current charges internal capacitors. The stored energy is 5 to 8 joules. The discharge rate is of one per second and the energy delivered is 1.5 joules.
Each engine has two independent ignition exciters
- Upper ignition exciter (IGN A) and lower ignition exciter (IGN B) .
- Upper ignition exciter supplies the right spark igniter (A) while lower ignition exciter supplies the left spark igniter (B).
The two ignition exciters for each energization are controlled by ECU and can be operated independently (starting sequence on ground) or simultaneously (continuous ignition). The ECU selects one ignition exciter for two successive automatic starts then selects the other ignition exciter, this is to avoid dormant failure and premature wear of sparks igniters.
Ignition Exciters(1) General
There are 2 ignition exciters which are mounted on the fan case with resilient shock mounts. The ignition exciters provide starting and continuous duty ignition on demand. Each ignition exciter is capable of independent operation and alternate use of ignition circuits is recommended.
There are 2 ignition exciters which are mounted on the fan case with resilient shock mounts. The ignition exciters provide starting and continuous duty ignition on demand. Each ignition exciter is capable of independent operation and alternate use of ignition circuits is recommended.
(2) Description
The ignition exciter is a capacitor discharge type exciter requiring an input of 115V (108 to 122 volts AC) at 400Hz (380 to 420Hz). The output voltage is 15 to 20KV at the end of a 13 foot ignition lead. A tin plated aluminium housing encloses the exciter and the components of the exciter are secured mechanically or with silicone adhesive to the housing. The housing is hermetically sealed to ensure proper operation under varying environmental conditions.
The ignition exciter is a capacitor discharge type exciter requiring an input of 115V (108 to 122 volts AC) at 400Hz (380 to 420Hz). The output voltage is 15 to 20KV at the end of a 13 foot ignition lead. A tin plated aluminium housing encloses the exciter and the components of the exciter are secured mechanically or with silicone adhesive to the housing. The housing is hermetically sealed to ensure proper operation under varying environmental conditions.
(3) Operation
The ignition exciter consists of an input circuit (filter network and power transformer), rectifier circuit and storage capacitor circuit, and a discharge circuit. The alternating current input is rectified and stored in the capacitors. When the capacitors reach approximately 2850 volts each they discharge a combined voltage of approximately 5700 volts.
The discharge process repeats at a rate depending on the charging time of the capacitors.
The ignition exciter consists of an input circuit (filter network and power transformer), rectifier circuit and storage capacitor circuit, and a discharge circuit. The alternating current input is rectified and stored in the capacitors. When the capacitors reach approximately 2850 volts each they discharge a combined voltage of approximately 5700 volts.
The discharge process repeats at a rate depending on the charging time of the capacitors.