Austro Engine AE300-Wizard, Руководство пользователя

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AE300-Wizard
Document No.:
E4.08.09 E4.08.09 : AE_xx_000
Revision:
13 9 : 00
Page:
21 of 89
Copyright © 2019, Austro Engine GmbH
Dept.:
Electric/Electronic
Type:
User Guide
6.3.2.3 Alternator
For aircraft equipped with alternator regulators part number E4A-91-100-000 (“old regula-
tors”):
If the engine is not running (both engines not running in case of DA42), the alternator regu-
lator is sensing a battery voltage below 29V and therefore excites the alternator to produce
an output voltage. This excitation current will result in overheating and possible damage of
the alternator and unnecessary battery drain (5A excitation current if rpm = 0).
To prevent the above from happening the following two methods are recommended:
-
Use a precisely STABILIZED ground power supply set to 29V (29V…30V) (set and
checked before connecting to the aircraft). First connect the power supply to the ground
power receptacle and THEN turn on electric master and engine master – with this the al-
ternator regulator senses the higher battery voltage and doesn’t excite the alternator.
-
If no stabilized ground power supply is available, the harness connector to the alternator
has to be disconnected (see maintenance manual for location of the connector).
For aircraft equipped with alternator regulators part number E4A-91-200-000
(“new regulators”):
This new regulator is able to detect the stopped alternator and DOES NOT EXCITE
the alternator thus preventing the overheating problem for the excitation coil. The proce-
dures described above are therefore not required for those aircraft.
6.3.2.4 Avionics
Pull circuit breakers of avionics and systems not required for diagnosis to save battery power
especially if no ground power is available (downloading data logger data may take up to 30
minutes or longer).
6.3.2.5 Engine Master / Electric Master Switch
Turn on the engine master only for the engine to be diagnosed.
During shut down turn off the engine master first, then wait about 10 seconds before turning
off the electric master. This allows the ECU to perform “clean-up tasks” like writing data from
RAM to non-volatile memory (e.g. data logger data).
Note:
Not doing so will cause erroneous entries into the Fault Code Memory during the next
start up. For instance a “data logger failure” with the error type: “No valid lead out sequence
from last session was found”.