Rotax 912 i series Operator's Manual page 74

7.4) Electric system
General note
EMS overview
EMS power supply
Effectivity: 912 i Series
OM Edition 1/Rev. 0
The ROTAX 912 iSc/iS 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 primarily comprises:
- High-voltage ignition components (connectors, spark plugs,
ignition cables, double ignition coils)
- ECU
- ECU (actuators) - OUTPUT
- 4 doublesignition coils
- Lamps
- Fuel injection 2 per cylinder
- CAN data for an indicating instrument
- ECU (signals) - INPUT
- Sensors
- EMS power supply
- Regulator rectifier
- Generator
- FUSE BOX ( all power supply components, including the fus-
es, etc., can be found in the power supply unit)
- Switches
- Cables/wiring
The EMS power supply primarily comprises 2 alternators with per-
manent 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
units. One is used for the ECU and the other one is available for
the aircraft. They are driven by the crankshaft and require no ex-
ternal supply once the engine has reached its idle speed.
NOTE: Until the idle speed is reached, the EMS re-
quires an external 12 V supply from the on-
board system of the aircraft.
BRP-Powertrain
page 7-8
January 01/2012