AIRCRAFT
DA 42 NG AMM
Electrical Power
Doc # 7.02.15
Rev. 4
24-40-00
Page 3
15 Mar 2018
3. Operation
When you connect a 28 V DC power supply to the external power socket these things happen:
)
Current can flow from the small positive pin to the solenoid of the external power relay, the solenoid
operates and closes the relay.
)
Current can flow from the large positive pin through the external power relay to the relay bus.
)
The large negative pin is connected to ground.
If the polarity of the power supply is incorrect, then the diode will prevent current from flowing through
the solenoid. The solenoid will not operate and current cannot flow through the external power relay
to the RELAY BOX BUS.
CAUTION:
WHEN OPERATING THE AIRPLANE ELECTRICAL SYSTEM WITH
ENGINE MASTER ON (LH OR RH) AND THE ENGINE IS NOT RUNNING
(e.g. EVENT LOG READOUT) ALWAYS CONNECT AN EXTERNAL
POWER SUPPLY WITH A PRESET VOLTAGE OF 29 V TO THE
AIRPLANE. OTHERWISE THE ALTERNATORS MAY BE DAMAGED.
ADDITIONALLY, IF MÄM 42-551 IS INSTALLED, SWITCH OFF BOTH
(LH AND RH) ALTERNATOR SWITCHES.
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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