CHAPTER 24
PAGE 4
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RA - FLUGZEUGBAU GmbH
SERVICE MANUAL EXTRA 200
PAGE DATE: 1. July 1996
24-30-00 DC-GENERATION
(Refer to Chapter 91) Power for the electrical system is
provided by an alternator and/or the battery. The alternator
serves as the main component to power the electrical
system and charge the battery during normal conditions.
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.
A rocker type master switch is used for energizing the
master relay, which connects power to the electrical sys-
tem.
The voltage regulator, receiving power from the battery via
the master switch in combination with the field circuit
breaker/switch, energizes the alternator field. With the
alternator field energized, the operating alternator will
produce an output to the electrical system. The voltage
regulator varies the output voltage of the alternator to meet
the requirements of the electrical system loads. An ammeter
is installed into the system to provide an indication of
current flow from or to the battery.
The negative side of the battery is connected to the aircraft
steel tube design (negative ground). This provides a ground
for the system through use of the steel tube design. The
positive side of the battery is connected to the coil of the
master relay. This relay remains in relaxed state until the
master switch is placed to the ON-position. Placing the
master switch in the ON-position provides a ground for the
master relay energizing this relay. With the master relay
energized, a circuit exists from the battery through an
ammeter to the bus bar.
The bus bar powers the electrical equipment and accesso-
ries furnished on the aircraft. The energized master relay
will also allow power from the battery to the starter relay.
Placing the 5 amp field circuit breaker/switch to the ON-
position likewise will provide a circuit from the bus bar
through a 40 amp alternatorcircuit breaker to the voltage
regulator. The voltage regulator will supply and regulate
voltage to the alternator field and protects circuit against
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