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AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-33-00 Page 3
20 Sep 2007
Figure 2: Electrical Generation System Simplified Schematic Diagram, %%
% if TR-MÄM-40-151 is carried out.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 4
20 Sep 2007 24-33-00 Doc # 6.02.01
Rev. 5
2. Description and Operation
Figure 1 shows the generation system simplified schematic diagram.
% Figure 2 shows the generation system simplified schematic diagram, if MÄM-40-151 is carried out.
A. Alternator
The alternator is supplied as part of the engine. It is a14 VDC machine with a maximum output of
90 A. It attaches to the rear left of the engine. A multi-V flat belt turns the alternator. An automatic
system adjusts the belt tension.
% The alternator has an integral voltage regulator. If MÄM-40-151 is carried out, an external regulator
% is used, mounted under the pilot´s seat.
There is no approved maintenance possible on the alternator.
B. Alternator Excitation Battery
The alternator excitation battery is a sealed unit. It is located on the instrument panel shelf on the
left. A strap holds the battery in position.
The battery power to energize the alternator field during start-up. The alternator then becomes selfsustaining.
The field voltage is sufficient to charge the excitation battery. If the field voltage fails,
the excitation battery provides sufficient power to maintain the alternator output for emergencies.
The ENGINE MASTER switch controls the circuit to the alternator field connection.
C. Alternator Current Sensor
An alternator current sensor is located inside the relay junction box.
D. Alternator Fuse
A 100 A fuse is located in the relay junction box between the alternator cable and the relay junction
box bus.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-33-00 Page 5
20 Sep 2007
% E. Alternator Regulator
% The alternator regulator is located under the pilot´s seat (MÄM-40-151 carried out) or is part of the
% Alternator. It measures the alternator output voltage and controls the current through the alternator
% field coils via a pulse-width modulated signal. To keep the output voltage stable in all load and
% speed situations, the alternator field signal is modulated accordingly.
% Alternator output is measured at a point called USense which is on the ECU Bus. This way the
% alternator regulator controls the voltage to be constant at this point and the voltage drops between
% alternator and the ECU Bus can be ignored.
% The alternator regulator includes a comprehensive set of diagnostic functions that will warn the
% operator using a CAUTION message (ALTERNATOR) on the annunciator panel in case of over%
or under-voltage as well as a couple of other internal warning levels.
% There is no approved maintenance possible on the alternator regulator.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 6
20 Sep 2007 24-33-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-33-00 Page 101
20 Sep 2007
Trouble Shooting
1. General
The table below lists the defects you could have with the generating system. If you have the trouble
detailed in the Trouble column read across to the Possible Cause column. Then do the repair given
in the Repair column.
Trouble Possible Cause Repair
Alternator warning light
illuminated.
Alternator defective. Refer to the engine
manufacturer.
% Alternator regulator defective. Refer to the engine
% manufacturer.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 102
20 Sep 2007 24-33-00 Doc # 6.02.01
Rev. 5
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AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-33-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This Section gives you the data to remove/install and adjust the components of the 14 VDC electrical
generation system on the airplane. Refer to the component manufacturers' manuals for more data and
shop data.
2. Electrical Safety
The DA 40 has a low voltage DC electrical system. When correctly maintained it is safe to work on.
The battery can supply heavy current through low resistance circuits (for example, if you ground the
positive output with a wrench by accident).
Always follow the usual safety practices for working on electrical equipment. Allow only qualified
persons to maintain the electrical system.
CAUTION: DISCONNECT THE BATTERY BEFORE DOING MAINTENANCE ON
　
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