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A logic circuit within the ECU, automatically selects the One is hardwired to channel A, the other to channel B. correct power source in the event of a failure.
The alternator is capable of supplying the necessary The power sources are the aircraft 28 VDC normal and power above an engine speed of approximately 10% N2. emergency busses.
GSE test equipment provides 28 VDC power to the ECU The two aircraft power sources are routed through the during bench testing and it is connected to connector J15. EIU and connected to the ECU.
-The A/C normal bus is hardwired to channel B.
- The A/C emergency bus is hardwired to channel A.

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CTC-201-015-00
EFFECTIVITY
73-21-60 Page 21
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
ELECTRONIC CONTROL UNIT
ECU Power Supply Logic.
Power supply when N2 < 12%.
Each channel is supplied by the A/C 28 VDC, through the
EIU. This enables:

-Automatic ground checks of the ECU before engine running.
-Engine starting.
-Supply of power to the ECU until the engine speed reaches 12% N2.
Power supply when N2 > 12% :
-At 12% N2, the control alternator directly supplies the ECU.
-Above 15% N2, the ECU logic automatically switches off the A/C power source, through the EIU power down function.
Note : In case of total alternator failure, the ECU will receive, as a back-up, the 28 VDC power from the A/C network. If the failure only affects the active channel, the ECU switches engine control to the other channel. The ENGine FIRE pushbutton cuts off the A/C 28 VDC.

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CTC-201-016-01
EFFECTIVITY
73-21-60 Page 23
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
ELECTRONIC CONTROL UNIT
Auto Power Down.
The ECU is automatically powered down on the ground, through the EIU, five minutes after engine shutdown. This allows printing of the post-flight report.
The ECU is also powered down, on the ground, five minutes after A/C power up, unless MCDU menus are used.
Fadec Ground Power Panel.
For maintenance purposes, the engine FADEC ground power panel enables FADEC supply to be restored on the ground, with engine shut down. When the corresponding ENGine FADEC GND POWER pushbutton is pressed “ON”, the ECU is supplied.
Caution : In this case, there is no automatic power down function. As long as the pushbutton is pressed “ON”, the ECU is supplied. ECU overtemperature may occur after a while.
Note : Both engines ECU’s are re-powered as soon as
IGN/START is selected with the rotary selector.
With master lever selected ON, the corresponding ECU
　
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