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Regular maintenance of the battery system is necessary. Do not wait until a starting problem occurs.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 2
20 Sep 2007 24-34-00 Doc # 6.02.01
Rev. 5
Hold-Down Strap
Battery
Positive Terminal
Negative Terminal
Figure 1: Main Battery Installation
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-34-00 Page 3
20 Sep 2007
3. ECU Backup Battery Description and Operation
The ECU backup battery is a 12 V, 12 Ah sealed unit. A tray below the right passenger’s seat holds
the base of the battery. A clamp holds the battery in place. The positive and negative cables attach
to terminals at the top of the battery. The usual rubber caps protect the connections.
When the ECU bus voltage is greater than the battery voltage, the bus charges the battery.
The battery supplies current to the ECU B through the ECU alternate power relay. The relay is on the
% instrument panel shelf. A 32 A fuse protects the circuit.
In the usual operation, 14 V on the ECU bus closes the ECU alternate power relay. This connects the
ECU bus to the battery through a diode and a resistor. The diode prevents the battery discharging
back through the system. The resistor limits the charging current.
If the power fails on the ECU bus, the relay de-energizes and connects the battery to the ECU B. It
also breaks the charging circuit.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 4
20 Sep 2007 24-34-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-34-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the battery system. If you have the trouble
detailed in the Trouble column read across to the Possible Cause column. Then do the repair given
in the Repair column.
Trouble Possible Cause Repair
Main battery voltage low. Battery capacity low.
Alternator output low.
Do a capacity test. If
necessary, replace the battery.
Trouble-Shoot the alternator,
refer to Section 24-33.
Main battery will not connect to
the ECU bus.
Battery relay defective.
ELECTRIC MASTER key
switch defective.
Battery system wiring
defective.
Replace the battery relay.
Replace the ELECTRIC
MASTER key switch.
Do a test of the battery system
wiring. Refer to Chapter 92 for
the wiring diagrams.
Main battery will not connect to
the hot battery bus.
100 A fuse failed. Replace the 100 A fuse. If the
fuse fails again, do a test for a
short circuit between the hot
battery bus and ground. Repair
or replace the defective
component.
Ammeter shows zero at all
times.
Defective ammeter.
Defective ammeter transducer.
Replace the integrated engine
display.
Replace the transducer.
Voltmeter shows zero with
ENGINE MASTER switch set
to ON.
Defective voltmeter.
Defective wiring in the
voltmeter system.
Replace the integrated engine
display.
Do a test of the wiring. Refer to
Chapter 92 for the wiring
diagrams.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Trouble Possible Cause Repair
Page 102
20 Sep 2007 24-34-00 Doc # 6.02.01
Rev. 5
ECU backup battery voltage
low.
Battery capacity low.
Alternator output low.
Do a capacity test. If
necessary, replace the battery.
Trouble-shoot the alternator,
refer to Section 24-33.
ECU backup battery will not
connect to the ECU B during
test.
ECU alternate power relay
defective.
ENGINE MASTER switch
defective.
ECU backup battery system
wiring defective.
Replace the battery relay.
Refer to Section 24-33.
Replace the ENGINE
MASTER switch. Refer to
Section 24-33.
Do a test of the battery system
wiring. Refer to Chapter 92 for
the wiring diagrams.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-34-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
Keep the battery clean. Remove grease and other contaminants from the battery case. Remove dirt
from the area of the terminals. Protect the terminals and cable lugs with Dow Corning compound 4
(DC4).
If you do not use the airplane regularly you must remove the battery for charging.
CAUTION: INSTALL ONLY A BATTERY WHICH IS APPROVED BY THE AIRPLANE
MANUFACTURER.
2. Safety Precautions
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钻石40系列AMM 1(122)
