Document: SLSA-MIP-5-4-0-US
Date of Issue: 05/2016
Revision: -
11-2
11.1
General
Electrical system of BRISTELL S-LSA airplane serves for supplying electrical current to the
instruments.
11.2
Description and operation
The airplane fitted with
Rotax 912 iS
engine is equipped with 14V DC electrical installations
with grounded negative pole. Primary source of electrical energy is formed by the generator.
The secondary source of electrical energy is the battery 12V, which is located on the firewall.
It is used for starting the engine and in the case of generator failure as a back
–up source of
electric energy.
DC voltage is distributed to the individual systems by means of the main bus bar. Systems
are protected by circuit breakers which are permanently ON and switches
–circuit breakers
which are turning ON as needed. If some of the circuits is overloaded, then the circuit breaker
disconnects the circuit.
After switching the
MASTER SWITCH
ON, SATR POWER switch ON, LANE A, B ON, and
Main fuel pump ON, the engine may be started by pressing red ENGINE START button. The
starter is supplied from the battery before starting the engine. After starting up the engine
and reaching the idle RPM, the generator starts supplying current to the electrical network.
Information about voltage in the main bus bar is indicated by low voltage red light on the
instrument panel.
The Rotax 912 iS Sport is equipped with an electronic guided dual ignition unit with integrated
generator.
The ignition unit is easy to maintain and needs (except for start the engine) no external power
supply.
The EMS (Engine Management System) primarily comprises:
-
High-voltage ignition components (connectors, spark plugs, ignition cables, double
ignition coils).
-
ECU (Engnien Control Unit)
-
ECU (actuators)
– OUTPUT
-
4 doublesignition coils
-
Lamps
-
Fuel injection 2 per cylinder
-
CAN data for an indicating instruments
-
ECU (signals)
– INPUT)
-
Sensors
-
EMS power supply
-
Regulator rectifier
-
Generator
-
FUSE BOX (all power supply components, including the fuses, etc., can be found in the
power supply unit)
-
Switches
-
Cables/wiring
The EMS power supply primarily comprises
Alternators with permanent magnets. It also comprises an external rectifier, voltage stabilizer
and overvoltage protection, which are integrated in the FUSE BOX. The two 3-phase A/C
current generators (alternators) are physically separated in the engine integrated power
supply unit. One is used for the ECU and the other one is available for the aircraft. They are
driven by the crankshaft and require no external supply once the engine has reached its idle
speed.
Summary of Contents for S-LSA
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