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A resistor in the circuit limits the charging current. A diode prevents the battery from discharging
through the circuit.
If power to the ECU bus fails, the ECU Alt Pwr relay de-energizes. The contacts open to break
the supply from the ECU bus and connect the ECU backup battery. The second set of contacts
open to break the charging circuit.
(6) Main Bus
The main bus provides power for the consumers. Each consumer has a circuit breaker to
protect the circuit. The main bus also connects to the switch contacts of 3 relays:
) The starter relay.
) The avionics master relay.
) The essential tie relay.
A circuit-breaker protects the supply to each relay.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-01-00 Page 7
20 Sep 2007
(7) Power Relay
The power relay connects the relay junction box bus and ECU bus to the main bus. The
essential bus switch controls the power relay.
(8) Essential Tie Relay
In the usual (de-energized) condition, the essential tie relay connects the main bus to the
essential bus.
In the emergency (energized) condition, the essential tie relay connects the hot battery bus to
the essential bus.
The essential bus switch controls the essential tie relay.
(9) Essential Bus Switch (marked ESS BUS)
The ESS BUS switch is located in the switch panel at the bottom left of the instrument panel.
In the OFF position, the ESS BUS switch gives a ground to the power relay coil. The relay
closes and connects the relay junction box bus to the main bus. This is the usual position when
all systems are operating correctly.
In the ON position, the ESS BUS switch disconnects the ground from the Power relay coil. The
Power relay opens and disconnects the main bus from the power supply (the relay junction box
bus). It also gives a ground to the coil of the essential tie relay. The relay energizes to break
the connection between the main bus and the essential bus. At the same time, it connects the
hot battery bus to the essential bus.
There is a light emitting diode in the essential bus switch. If there is power on the hot battery
bus, and the ELECTRIC MASTER key switch is set to ON or START, the light emitting diode
comes ON.
(10) Starter Relay
The Starter relay contacts and coil connect to the main bus. A 10 A circuit-breaker protects the
circuit.
When the ENGINE MASTER switch set to ON and the ELECTRIC MASTER key switch is set
to START, they give a ground to the relay coil. The relay connects the main bus to the starter
solenoid (part of the starter). The solenoid engages the starter and operates a heavy-current
contactor to connect the relay junction box bus to the starter.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 8
20 Sep 2007 24-01-00 Doc # 6.02.01
Rev. 5
(11) Avionics Master Relay
The avionics master relay connects the main bus to the avionics bus. The AVIONIC MASTER
switch controls the relay.
(12) Essential Avionics Relay
The Essential Avionics relay connects the essential bus to the essential avionics bus. The
AVIONIC MASTER switch controls the relay.
(13) AVIONIC MASTER switch
With the avionic master switch set to OFF:
) The avionic master relay is energized to disconnect the avionics bus from the main bus.
) The essential avionics relay is energized to disconnect the essential avionic bus from the
essential bus.
With the Avionic Master switch set to ON,
) The avionic master relay is de-energized to connect the avionics bus to the main bus.
) The essential avionics relay is de-energized to connect the essential avionic bus to the
essential bus.
(14) ENGINE MASTER Switch
The ENGINE MASTER switch is located on the left, center of the instrument panel switch
panel. It has four sets of contacts. When set to ON, each set of contacts connects one input to
one output as follows:
) ECU Alt Pwr relay output to ECU B.
) ECU A power supply to ECU A.
) Alternator excitation battery to the alternator field connection.
) ELECTRIC MASTER key switch START connection to the Starter relay.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-30-00 Page 1
20 Sep 2007
Section 24-30
DC Generation - Lycoming Engine
1. General
The DC generation system for the DA 40 with the Lycoming engine has these components:
) Alternator.
) ALT/BAT switch.
) Alternator control circuit-breaker.
) Alternator circuit-breaker.
) Voltage regulator.
) Alternator protection circuit-breaker.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 2
20 Sep 2007 24-30-00 Doc # 6.02.01
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钻石40系列AMM 1(111)
