STATIC INVERTER - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL

1. General
The 1000 VA nominal-power static inverter transforms the direct current voltage from battery 1 into a single-phase 115 VAC/400 Hz alternating current.

** ON A/C NOT FOR ALL

2. Component Location

Contactor and Fuse - Component Location

Static Inverter - Component Location

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FIN ! FUNCTIONAL DESIGNATION ! PANEL!ZONE!ACCESS ! ATA

! ! ! ! DOOR ! REF.

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5XB HOLDER-FUSE 105VU 126 822 24-28-00

5XB1 FUSE-AC STAT INV BUS SPLY 105VU 126 822 24-28-00

FIN	FUNCTIONAL DESIGNATION	PANEL	ZONE	ATA REF
** ON A/C ALL
2XB	CNTOR-STAT INV	105VU	126	24-28-55
3XB	STAT INV		126	24-28-51
5XB	HOLDER-AC STAT INV BUS SPLY FUSE	105VU	126	24-28-00

** ON A/C NOT FOR ALL

3. System Description
The static inverter starts to operate automatically in the conditions that follow:

APU start (supply of fuel pump)
Battery supplies the engine ignition system (in emergency configuration)
Ram Air Turbine (RAT) deployment (< 10s) (supply of ECAM display units),
On ground, on batteries only (pushbutton switch supply)
In emergency configuration after landing, when the CSM/G is switched off (the 115 VAC ESS BUS 4XP is supplied, the CSM/G is not supplied).

** ON A/C NOT FOR ALL

4. Operation/Control and Indicating

Static Inverter - Schematic Diagram

The static inverter starts automatically if:

the AC BUS 1 and 2 are lost,
the CSM/G is not available, and
speed is more than 50 Kts.

When the static inverter is faulty, it generates a permanent ground signal to the BCL1.
The presence of the ground signal means:

overheat,
output overvoltage,
input undervoltage,
input overvoltage.

The static inverter defect is sent to the battery charge limiter 1 which stores it in a memory as a class I failure.
When the network is supplied, STATIC INV FAULT message appears on the upper ECAM display unit.
The fault indication will be available during BCL BITE reading from the Centralized Fault Display System (CFDS).

** ON A/C NOT FOR ALL

5. Test
On the ground, the static inverter can be checked applying the following procedure (aircraft supplied by EXT POWER or APU GEN):

EMER GEN TEST: ON
BUS TIE: OFF
On the ECAM ELEC page, check voltage and frequency of static inverter.

[Rev.10 from 2021] 2026.03.31 23:22:58 UTC