AIRCRAFT
DA 42 NG AMM
Electrical Power
Doc # 7.02.15
Rev. 4
24-30-00
Page 5
15 Mar 2018
2. Description and Operation
Figure 1, 2 and 3 shows the generation system simplified schematic diagram.
A. Alternators
Each engine has an alternator supplied with the engine. Each alternator is 28 VDC machine with
a maximum output of 70 Ampere. The alternator is located at the rear left of the engine. A
multi-V flat belt drives the alternator. An automatic system keeps the belt at the correct tension.
The alternator has an external regulator which is located in the engine nacelle.
There is no approved maintenance that you can do to the alternator.
B. Alternator Relays
The alternator relays connect the output from each alternator to the related MAIN BUS. Each
alternator relay is controlled by a switch located on the instrument panel. The relays are located
in the relay box. The relay box is located in the front baggage compartment.
C. Alternator Current Sensors
A current sensor monitors the current flowing in the alternator outputs and indicates them on the
Garmin G 1000 system. This current sensor is located below the pilot's seat and monitors the
current flow between the alternator and the related alternator relay.
D. Alternator Regulators
Each alternator has an external regulator. The regulator controls the output of the alternator. If
MÄM 42-551 is carried out, additional current sensors are installed. These sensors are independent
from the sensors for the Garmin G1000 system. They are installed in the LH and RH engine
nacelles and connected to the LH alternator regulator only. The LH alternator regulator controls its
output depending on the output current of both alternators.
E. ECU Backup Batteries
To support the alternator electrical power supply to the ECUs in case of a malfunction of the main
battery, additional sealed-lead-acid batteries (ECU backup batteries) are connected to the RH and
LH ECU BUS.
Summary of Contents for DA 42 NG
Page 933: ...AIRCRAFT DA 42 NG AMM Fuel Doc 7 02 15 Rev 4 28 TITLE Page 1 15 Mar 2018 CHAPTER 28 FUEL ...
Page 1459: ...AIRCRAFT DA 42 NG AMM Lights Doc 7 02 15 Rev 4 33 TITLE Page 1 15 Mar 2018 CHAPTER 33 LIGHTS ...
Page 1711: ...AIRCRAFT DA 42 NG AMM Doors Doc 7 02 15 Rev 4 52 TITLE Page 1 15 Mar 2018 CHAPTER 52 DOORS ...
Page 1853: ...AIRCRAFT DA 42 NG AMM Wings Doc 7 02 15 Rev 4 57 TITLE Page 1 15 Mar 2018 CHAPTER 57 WINGS ...
Page 2071: ...AIRCRAFT DA 42 NG AMM Engine Doc 7 02 15 Rev 4 72 TITLE Page 1 15 Mar 2018 CHAPTER 72 ENGINE ...
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