Extra 300LX, Maintenance Manual

Page: 163 / 515

CHAPTER 24
PAGE 5 PAGE DATE: 1. March 2011
MAINTENANCE MANUAL EXTRA 330LX
24-30-00 DC-GENERATION
(Refer to figure 2) Power for the electrical system is
provided by the battery and/or the alternator.
An ammeter is installed into the system to provide an
indication of current flow from (discharge current, negative
values) or to (charge current, positive values) the battery.
The respective shunt is part of the electrical main board (see
figure 1).
N O T E When external power is used the ammeter indicates the
current flow from the battery to the electrical system
(negative value) but not the battery charge current flow.
The complete electrical system can be cut off by switching
off both the BATTERY and ALTERNATOR switch.
24-30-10 Battery System
The battery is used for starting the engine and powering the
electrical system when alternator power is not available
(engine not running). The battery also powers the electrical
system in case of alternator failure.
The battery system consists of the battery, the battery relay
(see figure 1), a 80 A fuse, the battery switch and the
associated wiring. The battery is located on the left side of
the fuselage just behind the firewall; the battery relay and the
fuse are parts of the electrical main board, and the BATTERY
switch is installed on the left side of the rear cockpit. The
toggle type BATTERY switch features a red cap.
The positive side of the battery is connected to the coil of the
battery relay. This relay remains in open state until the
BATTERY switch is placed to the ON-position. Placing the
BATTERY switch in the ON-position provides a ground for
the battery relay energizing this relay. With the battery relay
energized, a circuit exists from the battery to the bus bar. The
battery supplies power to the bus bar through the 80 A fuse.
The energized battery relay will also allow power from the
battery to the starter relay (see figure 1).