MGL Avionics Stratomaster Ultra “L” Owner’s manual
Page 76
Please note – this wiring is critical and must never break in flight. It would be possible to create
electrical sparks in the fuel tank if your wiring is faulty or incorrect. The consequences of this can
be imagined. This has nothing to do with the RDAC EIS itself but is a general hazard for any
automotive fuel level sender installation.
If you have no experience with electrical wiring,
PLEASE
delegate the task to a qualified
automobile electrician or electronics technician.
If you need to remove the RDAC EIS, please first disconnect and secure the fuel level sender
wire before disconnecting anything else.
Connecting the rev counter
Typical connection in case of
a Rotax two stroke engine with
Ducati dual ignition.
The Stratomaster Ultra assumes as a default that you will be connecting a Rotax with DCDI
ignition system. Such a system produces 6 pulses for every revolution of the engine.
Other engines can be used but you must adjust the rev counter calibration setting accordingly
(Device basic setup menu).
The value entered is for 10 revs.
Rotax 503,582,618 DCDI - value 60.
Rotax 912,914 – value 10.
The rev counter input can be connected to a variety of different sources such as the low voltage
side of a ignition coil (at the points contact breaker) or to rev counter outputs of fuel injection
computers.
Note: The RDAC EIS package contains a 220 ohm resistor. Normally you would not need it. We
have found a few Rotax engines that create a very noisy signal where you will need to use it. The
problem manifests itself by several rev band regions giving unstable rev readings. Should you be
unlucky enough to have one of these systems, please connect the resistor between the rev
counter input and the ground input in parallel to your connection to the gray rev counter wire from
the engine.
Engine with generator
such as Rotax 503,
Rotax 582 etc
Grey wire from
Rotax DCDI
ignition system
Ground
connection to
engine
