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Doc # 6.02.01
Rev. 5 24-01-00 Page 3
20 Sep 2007
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% Figure 2: 14 VDC Electrical System Schematic Diagram (TR-MÄM-40-151 carried out)
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 4
20 Sep 2007 24-01-00 Doc # 6.02.01
Rev. 5
2. 14 VDC System Description and Operation
Figure 1 shows the electrical system schematic diagram.
% Figure 2 shows the electrical system schematic diagram, if TR-MÄM-40-151 is carried out.
A. Power Supplies
(1) Main Battery
The main battery is located in the engine compartment on the firewall on the RH side. It is a
% 12 V, 35 Ah sealed battery. It connects to the fire wall ground point, the hot battery bus and the
battery relay.
(2) Alternator
The alternator is located at the bottom, left rear of the engine. A flat multi-vee belt with automatic
tensioner turns the alternator. The alternator is a 12-14 VDC, 90 A machine with an integral
% regulator. If TR-MÄM-40-151 is carried out, the alternator is connected to an external regulator,
% located under the pilot`s seat. The output connects to the junction box bus bar. The field can be
energized directly by the alternator excitation battery if the main battery fails.
(3) Alternator Excitation Battery
The alternator excitation battery is located on the instrument panel shelf. It is a 12 V, 1.3 Ah
sealed battery. It connects directly to the alternator field connection when the ENGINE MASTER
switch is set to ON.
(4) Engine Control Unit (ECU) Backup Battery
The ECU backup battery is located under the rear passengers´ seat on the RH side. It is a
12 V, 12 Ah sealed battery. The ECU backup battery connects directly to the ECU alternate
power relay.
(5) External Power Connector
The external power connector is located on the left side of the fuselage, near the relay junction
box. The external power connector connects to the external power relay in the relay junction
box on the firewall.
) The control pin connects to the relay coil through a diode to prevent reverse connection.
) The + pin connects to the relay main input connection.
) The - pin connects to ground.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-01-00 Page 5
20 Sep 2007
B. Power Supply Control
(1) Battery Relay
The battery relay is located in the relay junction box on the firewall. The output connects directly
to the relay junction box bus bar. The coil + of the battery relay is tied to the battery +
connection to the relay. The ELECTRIC MASTER key switch provides the coil ground when set
to the ON or START position.
(2) External Power Relay
The external power relay is located in the relay junction box on the firewall. The output
connects directly to the relay junction box bus bar.
If 14 VDC external power is connected, the +14 VDC on the control pin energizes the relay. The
relay connects the external power to the relay junction box bus bar.
(3) Bus Structure
All buses (except the relay junction box bus) are flat metal strips connecting rows of circuitbreakers.
The circuit-breakers are located immediately below the instrument panel in one row.
(4) Relay Junction Box Bus
The relay junction box bus is located in the relay junction box on the firewall. It is a flat metal
strip connecting these relays:
) The external power relay.
) The battery relay.
) The glow relay.
The bus has two outputs:
) The ECU bus.
) The engine starter motor solenoid.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 6
20 Sep 2007 24-01-00 Doc # 6.02.01
Rev. 5
(5) ECU Bus
The ECU bus is located at the left end of the circuit breakers. The ECU bus has power when
the any one of the following are connected to the relay junction box bus:
) The main battery.
) External power.
) The alternator.
The ECU bus provides power for Engine Control Unit A (ECU A) and ECU B. A 25 A circuitbreaker
protects each circuit.
It also provides power for the ECU alternate power relay (ECU Alt Pwr relay), for the essential
tie relay, and for the power relay.
During the usual operation, 12 V from the ECU bus energizes the ECU Alt Pwr relay. One set
of contacts close to connect the ECU B supply through the ENGINE MASTER switch to the
ECU. The second set of contacts close to provide charging current for the ECU backup battery.
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钻石40系列AMM 1(110)
