Electronic Revolution Counter; Connection To Dual Ignition System - Rotax 447 UL SCDI Installation Manual

AIRCRAFT ENGINES
INSTALLATION MANUAL
18.5.3)

Electronic revolution counter:

The revolution counter, part no. 966 404, has been specifically
designed to be connected to the 12 pole flywheel generator
used on the Ducati CDI Systems.
The revolution counter measures the frequency of the pulses
provided by one of the transducers supply winding where it is
connected. It does not require any external power supply. It is
connected by two wires without polarity.
The indicating range is up to 8000 r.p.m. The weight is 235
gram.

Connection to dual ignition system:

02960
fig. 45
The generator integrated in the DUCATI dual ignition has a
special gray cable for revolution counter connection. The
revolution counter 966 404 must be fitted between the gray
cable and mass (brown cable).
The tachometer will indicate correct RPM even if one of the two
ignition systems is turned off for ignition testing procedure or a
transducer failure occurs.
Maximum allowed deviation: +/- 100 1/min
Effectivity: 447 UL SCDI, 503 UL DCDI, 582 UL DCDI /mod. 99
page 18 - 6
Initial issue, May 01/99