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the coil to ground.
The main bus supplies the airplane electrical systems through circuit-breakers.
(2) Electrical System with Essential Bus
The alternator supplies the main bus through the alternator circuit-breaker. The battery supplies
the essential bus through the battery relay and the battery circuit-breaker. The battery supplies
a positive voltage to the coil of the battery relay. The ALT/BAT switch connects the other side
of the coil to ground.
The essential bus supplies the following electrical consumers through circuit-breakers:
) NAV/COM 1.
) Transponder (XPDR).
) Flood light.
) Attitude gyro (artificial horizon).
) VM 1000 engine instrument.
) Annunciator panel.
) GPS (if installed).
) Landing light.
) Pitot heating system.
) Flaps.
The main bus supplies the other electrical consumers through circuit-breakers.
Normally the main bus and the essential bus are connected via the MAIN TIE circuit-breaker,
the tie relay, and the ESS TIE circuit-breaker. In the event of electrical failure during flight, the
pilot can set the ESS BUS switch to ON to open the tie relay and separate the essential bus
from the main bus. When the ESS BUS switch is set to ON, the only the electrical consumers
which are listed above will be supplied with power.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 4
20 Sep 2007 24-60-00 Doc # 6.02.01
Rev. 5
VOLTAGE REGULATOR MAIN BUS
ANNUN. AVIONIC BUS
ALT. PROT.
ALT. CONT.
ALT.
MAIN TIE
ALT
ALTERNATOR CURRENT SENSOR
START
START
BATT
BATT
BATT
EXTERNAL POWER
BATTERY
24 V
11 AMP HRS
STARTER
160 A
ALTERNATOR
28 V / 70 A
OVERVOLTAGE
PROTECTION
AVIONIC
BUS
ESSENTIAL
AVIONIC
BUS
ESS TIE
ESS AVIONIC
ESS BUS
MASTER CONTROL
AVIONIC
ESSENTIAL BUS
Figure 2: DC Electrical Load Distribution with Essential Bus (simplified)
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-60-00 Page 5
20 Sep 2007
B. Avionic Bus and Essential Avionic Bus
The normally-closed contacts of the avionics master relay connect the main bus to the avionic bus.
A 25 Amp circuit-breaker protects the system. A 2 Amp circuit-breaker protects the control circuit
for the relay. The control circuit of the avionics master relay connects to the avionics master switch.
When the electrical system has an essential bus, then it also has an essential avionic bus. The
normally-closed contacts of the essential avionics relay connect the essential bus to the essential
avionic bus. A 25 Amp circuit-breaker protects the system. A 2 Amp circuit-breaker protects the
control circuit for the relay. The control circuit of the essential avionics relay connects to the
avionics master switch.
C. Battery Bus
The external power unit relay, the starter relay and the battery relay connect to the battery bus.
The battery supplies power to the battery bus through the battery relay. Power from an external
power source can be supplied to the battery bus through the external power relay.
D. Hot Bus
The airplane battery supplies power to the hot bus from the battery side of the battery relay coil.
Items of electrical equipment which are connected to the hot bus are protected by fuses.
E. Circuit-Breakers
Circuit-breakers protect the wiring in each circuit from too much current. The circuit-breakers are
located on the instrument panel, see Figures 3 and 4. You can open and close all the circuitbreakers
manually. If too much current flows in a circuit, the related circuit-breaker opens
automatically.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 6
20 Sep 2007 24-60-00 Doc # 6.02.01
Rev. 5
Figure 3: Circuit-Breaker Locations for Larger Instrument Panels
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-60-00 Page 7
20 Sep 2007
3. Operation
When the ALT/BAT switch is set to ON, it gives a ground to the battery relay coil. The battery relay
closes and connects the battery to the main bus through the battery bus and the battery circuitbreaker.
When the AVIONICS MASTER switch is set to OFF, the control circuit is closed. If there is power on
the main bus, the avionics master relay energizes. The master relay contacts open. The avionics bus
disconnects from the main bus.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 8
20 Sep 2007 24-60-00 Doc # 6.02.01
Rev. 5
Figure 4: Circuit-Breaker Locations for Smaller Instrument Panels
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钻石40系列AMM 1(129)
