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% 24-32. Electrical Power Generation.
% 24-41. External Power.
% 24-61. Power Distribution.
% Note: Equipment which is certified for installation in the DA 40 is listed in Section 6.5 of % the Airplane Flight Manual. Such equipment may be installed in accordance with % the Airplane Maintenance Manual.
% Any equipment which is not listed in Section 6.5 of the Airplane Flight Manual is % called "Additional Equipment". The installation of Additional Equipment is a % modification which must be handled in accordance with national regulations or a % Service Bulletin.
%

Doc # 6.02.01 Page 1
Rev. 4 09 Jan 2003

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AMM

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Electrical Power
AMM

% 2. 14 VDC System Description and Operation
% Figure 1 shows the electrical system schematic diagram.
% 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 engine mount 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. 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.
%

Doc # 6.02.01 Page 3
Rev. 4 09 Jan 2003

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AMM

% 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 circuit-
% breakers. 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.
Page 4 Doc # 6.02.01 09 Jan 2003 Rev. 4
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